Journal articles: 'Air Purification Photocatalysis'

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Hu, Cheng Zhen, Yan Nan Cai, Jiang Wu, Bi Chen Yan, Xue Jun Qiu, Hai Ting He, Liu Liu Zhang, and Yue Yu. "Study on Photocatalytic Technology with Photovoltaic-Thermal Integration and its Applications in Indoor Air Purification." Advanced Materials Research 864-867 (December 2013): 1360–63. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1360.

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In terms of energy and environmental purification, application of photocatalytic purification in energy and environment is getting increasingly widespread. In the present paper, it focused on the applications of photocatalytic technology in indoor air purification. Photocatalyst and photocatalytic reaction devices are the two issues in photocatalytic air purification. Fe-La co-doped TiO2 was prepared, and integration of photovoltaic-thermal circular photocatalytic air purification reactor was designed, which showed high air purification efficiency. The experimental data and theoretical analysis gave the support to exploit new indoor air purification technologies. Further, technical and economic analysis on photocatalysis technology with photovoltaic-thermal integration applying in indoor air purification was studied and helpful results were attained.

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Alalm, Mohamed Gar, Ridha Djellabi, Daniela Meroni, Carlo Pirola, Claudia Letizia Bianchi, and Daria Camilla Boffito. "Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications." Catalysts 11, no. 5 (April 28, 2021): 562. http://dx.doi.org/10.3390/catal11050562.

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Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research–practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.

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Jiang, Zhuoying, and Xiong (Bill) Yu. "Kinetic studies on using photocatalytic coatings for removal of indoor volatile organic compounds." Indoor and Built Environment 29, no. 5 (July 8, 2019): 689–700. http://dx.doi.org/10.1177/1420326x19861426.

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Titanium dioxide (TiO2) is a known photocatalyst with a capability of decomposing organic substances. However, the photocatalysis of the pure TiO2 is not effective for the indoor environment due to a lack of the ultraviolet irradiation inside a building. Doping TiO2 with substance such as C, N, or metal can extend the threshold of the absorption spectrum to the visible spectrum region. Thus, doped-TiO2 is able to decompose volatile organic compounds (VOCs) under an indoor environment. To date, most experimental works reported on photocatalytic kinetics were conducted inside small-scale devices. The performance of air purification function under the actual indoor application scenery need to be further clarified. For this purpose, it is crucial to predict the performance of autogenous air quality improvements by visible light-driven photocatalyst for the actual applications. This work has developed a model to evaluate the performance of functional coating with photocatalyst in removing VOCs. Factors such as the effects of coating designs and indoor ambient conditions on the air purification efficiency were studied. This work demonstrates that doped-TiO2 photocatalytic coating is effective to improve the indoor air quality.

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Janczarek, Marcin, and Ewa Kowalska. "Computer Simulations of Photocatalytic Reactors." Catalysts 11, no. 2 (February 3, 2021): 198. http://dx.doi.org/10.3390/catal11020198.

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Photocatalysis has been considered future technology for green energy conversion and environmental purification, including carbon dioxide reduction, water splitting, air/water treatment, and antimicrobial purposes. Although various photocatalysts with high activity and stability have already been found, the commercialization of photocatalytic processes seems to be slow; it is thought that the difficulty in scaling up photocatalytic processes might be responsible. Research on the design of photocatalytic reactors using computer simulations has been recently intensive. The computer simulations involve various methods of hydrodynamics, radiation, and mass transport analysis, including the Monte Carlo method, the approximation approach–P1 model, and computational fluid dynamics as a complex simulation tool. This review presents all of these models, which might be efficiently used for the scaling-up of photocatalytic reactors. The challenging aspects and perspectives of computer simulation are also addressed for the future development of applied photocatalysis.

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Salvadores, Federico, Orlando Mario Alfano, and María de los Milagros Ballari. "ASSESSMENT OF THE INDOOR AIR PURIFICATION BY PHOTOCATALYTIC PAINTS." Latin American Applied Research - An international journal 50, no. 2 (February 21, 2020): 71–76. http://dx.doi.org/10.52292/j.laar.2020.352.

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Photocatalytic building materials containing TiO2 were extensively studied for outdoor applications using solar radiation. Nowadays, the market offers a wide variety of these materials with self-cleaning and air purification functionalities. However, heterogeneous photocatalysis applied in indoor construction materials was less developed. The objective of this work is to investigate the photocatalytic performance of carbon doped TiO2 in replacement of the normal pigments in indoor wall paint formulations. To achieve this goal, the photocatalytic oxidation of acetaldehyde in gas phase was carried out. The air decontamination process was conducted using regular indoor light in a bench scale chamber photoreactor simulating a room. The main environmental conditions that affect the photocatalytic process were varied: air flow rate, irradiance, relative humidity and acetaldehyde concentration. The results were analyzed through the response surface methodology and revealed the air purifying power of photocatalytic paints under indoor conditions.

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Boumahdi, Meryeme, Chaker El Amrani, and Siegfried Denys. "An Innovative Air Purification Method and Neural Network Algorithm Applied to Urban Streets." International Journal of Embedded and Real-Time Communication Systems 10, no. 4 (October 2019): 1–19. http://dx.doi.org/10.4018/ijertcs.2019100101.

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In the present work, multiphysics modeling was used to investigate the feasibility of a photocatalysis-based outdoor air purifying solution that could be used in high polluted streets, especially street canyons. The article focuses on the use of a semi-active photocatalysis in the surfaces of the street as a solution to remove anthropogenic pollutants from the air. The solution is based on lamellae arranged horizontally on the wall of the street, coated with a photocatalyst (TiO2), lightened with UV light, with a dimension of 8 cm × 48 cm × 1 m. Fans were used in the system to create airflow. A high purification percentage was obtained. An artificial neural network (ANN) was used to predict the optimal purification method based on previous simulations, to design purification strategies considering the energy cost. The ANN was used to forecast the amount of purified with a feed-forward neural network and a backpropagation algorithm to train the model.

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Mengjie, Wu, and Liu Kun. "Application of and research on TiO2 photocatalysis technology." E3S Web of Conferences 165 (2020): 05001. http://dx.doi.org/10.1051/e3sconf/202016505001.

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Nano-TiO2 photocatalysis technology is a new environmental pollutant purification technology, but its application is very extensive. This paper introduces the photocatalytic properties of nano-TiO2, and summarizes the research progress of nano-TiO2 in industrial wastewater, marine pollution, solid waste degradation, air purification and sterilization. At the same time, it is pointed out that the nano-TiO2 photocatalytic technology has not fully reached the practical application level, and the development trend of nano-TiO2 photocatalytic materials is prospected. Photocatalytic oxidation (PCO) using nanomaterials is a promising technology for removing pollutants, especially in deodorization, degradation of volatile organic compounds (VOCs) and sterilization. The mechanism of nanometer photocatalysis was reviewed in this paper. The influence factors including initial concentration of pollutants, reaction time, light intensity, humidity, surface area and catalyst activity were discussed. Furthermore, the application in photocatalytic removal of gas phase contaminants was summarized, and the future development of its application was proposed based on the existing problems.

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Ding, Jun. "Preparation of TiO₂ Photocatalysis Antibacterial Ceramics." Key Engineering Materials 575-576 (September 2013): 302–5. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.302.

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Among various inorganic antibacterial materials, TiO2 photocatalysis antibacterial materials possess unique properties including long lifespan, nontoxicity, high temperature resistance as well as high physical and chemical stability. More significantly, they are largely involved in many photocatalytic effects such as degradation of organics, purification of air, sewage disposal and self-cleaning.

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Hay, Stephen, Timothy Obee, Zhu Luo, Ting Jiang, Yongtao Meng, Junkai He, Steven Murphy, and Steven Suib. "The Viability of Photocatalysis for Air Purification." Molecules 20, no. 1 (January 14, 2015): 1319–56. http://dx.doi.org/10.3390/molecules20011319.

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Halak, О., N. Poltorak, О. Kravchuk, V. Synko, and Y. Korol. "APPLICATION OF TITANIUM OXIDE COATINGS FOR NEUTRALIZATION OF HAZARDOUS CHEMICAL SUBSTANCES." Collection of scientific works of Odesa Military Academy 2, no. 12 (December 27, 2019): 131–36. http://dx.doi.org/10.37129/2313-7509.2019.12.2.131-136.

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Contamination of hazardous chemicals is currently considered one of the major environmental problems. The methods of purification of gaseous emissions depending on the physicochemical properties of pollutants, in particular dangerous chemical, their aggregate state, concentration in the gas environment are studied in this article. The effect of aerosol content such as dust and soot is analyzed as well as the efficiency of purification methods at different temperature intervals, methods of purification of multicomponent mixtures. The comparative characteristics of thermochemical, reagent, sorption and catalytic methods are given and the prospects of their application in filtering systems of stationary and mobile objects are evaluated. It has been proved that almost any organic compounds can be oxidized (mineralized) on the TiO2surface. In practice, any photocatalytic air purifier includes a porous TiO2 deposited carrier, which is irradiated with ultraviolet rays and through which air is purged. Photocatalysis is suitable for domestic use as it can occur at room temperature. For example, a thermocatalytic method of destroying harmful substances requires preheating the air to a temperature above 200 ° C. Photocatalysis destroys substances that penetrate even through activated carbon filters. Features of formation of oxide coatings by plasma-electrolytic oxidation of titanium alloys are considered. It is proposed to refine the design of collective defense systems on armored vehicles and stationary facilities with additional installation in the filter-absorber of the grid with the deposited layer of catalytic material, which will neutralize various types of dangerous chemicals due to photocatalytic air purification.

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Zhao, Ziyan, Yuehan Cao, Fan Dong, Fan Wu, Bangxin Li, Qian Zhang, and Ying Zhou. "The activation of oxygen through oxygen vacancies in BiOCl/PPy to inhibit toxic intermediates and enhance the activity of photocatalytic nitric oxide removal." Nanoscale 11, no. 13 (2019): 6360–67. http://dx.doi.org/10.1039/c8nr10356a.

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Weon, Seunghyun, Fei He, and Wonyong Choi. "Status and challenges in photocatalytic nanotechnology for cleaning air polluted with volatile organic compounds: visible light utilization and catalyst deactivation." Environmental Science: Nano 6, no. 11 (2019): 3185–214. http://dx.doi.org/10.1039/c9en00891h.

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Chaturvedi, Shalini, and Pragnesh N. Dave. "Environmental Application of Photocatalysis." Materials Science Forum 734 (December 2012): 273–94. http://dx.doi.org/10.4028/www.scientific.net/msf.734.273.

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Recent interest and studies in environmental photo-chemistry, in natural photosynthesis, and chemical methods for solar energy transformations has contributed greatly to our knowledge and understanding of the various phenomena related to both photo-chemistry and catalysis. As an emerging nanotechnology come together with the chemical mechanisms of photo-catalysis, the photo-catalytic nanoparticle titanium dioxide offers a new meaning of remediation and degradation on volatile organic compounds in the aqueous and airs streams. In this chapter we discuss about application of photocatalysis in environment like biological contamination, air purification, water disinfection, hazardous waste remediation, water purification, self-clean buildings, deodorizing, anti-bacterial action, anti-fogging resolving cleaning action etc.

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Peral, José, Xavier Domènech, and David F. Ollis. "Heterogeneous Photocatalysis for Purification, Decontamination and Deodorization of Air." Journal of Chemical Technology & Biotechnology 70, no. 2 (October 1997): 117–40. http://dx.doi.org/10.1002/(sici)1097-4660(199710)70:2<117::aid-jctb746>3.0.co;2-f.

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Wei, Wenqi, Lida Zhao, and Zhongxiang Jing. "Design of Air Purification Device Based on Efficient Photocatalysis." IOP Conference Series: Earth and Environmental Science 450 (March 24, 2020): 012106. http://dx.doi.org/10.1088/1755-1315/450/1/012106.

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Lu, Yuanwei, Dinghui Wang, Yuting Wu, Chongfang Ma, Xingjuan Zhang, and Chunxin Yang. "Synergistic Effect of Nanophotocatalysis and Nonthermal Plasma on the Removal of Indoor HCHO." International Journal of Photoenergy 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/354032.

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Photocatalysis is an effective method of air purification at the condition of a higher pollutant concentration. However, its wide application in indoor air cleaning is limited due to the low level of indoor air contaminants. Immobilizing the nanosized TiO2particles on the surface of activated carbon filter (TiO2/AC film) could increase the photocatalytic reaction rate as a local high pollutant concentration can be formed on the surface of TiO2by the adsorption of AC. However, the pollutant removal still decreased quickly with the increase in flow velocity, which results in a decrease in air treatment capacity. In order to improve the air treatment capacity by the photocatalytic oxidation (PCO) method, this paper used formaldehyde (HCHO) as a contaminant to study the effect of combination of PCO with nonthermal plasma technology (NTP) on the removal of HCHO. The experimental results show that HCHO removal is more effective with line-to-plate electrode discharge reactor; the HCHO removal and the reaction rate can be enhanced and the amount of air that needs to be cleaned can be improved. Meanwhile, the results show that there is the synergistic effect on the indoor air purification by the combination of PCO with NTP.

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Feng, Xin, Wendong Zhang, Yanjuan Sun, Hongwei Huang, and Fan Dong. "Fe(iii) cluster-grafted (BiO)2CO3 superstructures: in situ DRIFTS investigation on IFCT-enhanced visible light photocatalytic NO oxidation." Environmental Science: Nano 4, no. 3 (2017): 604–12. http://dx.doi.org/10.1039/c6en00637j.

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Hossain, S. M. Azad, Md Eaqub Ali, and Sharifah Bee Abd Hamid. "Synergizing TiO₂ Surface to Enhance Photocatalysis: A Green Technology for Clean and Safe Environment - A Review." Advanced Materials Research 1109 (June 2015): 300–303. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.300.

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Photocatalytic removal of pollutants from air and water is a green technology that helps us to maintain a healthy life, clean environment and a balanced ecosystem. Photo-excited TiO2has strong oxidation ability that can be used to purify indoor air and polluted water. Numerous parameters such as UV light intensity, humidity, substrate concentration, substrate type and O2partial pressure influence the removal rate of gaseous and/or aqueous contaminants. However, TiO2photocatalyst cannot decompose large amount of contaminants or refractory chemicals because of the interference in light penetration by the bulk pollutants. Modification of TiO2surface or combining the TiO2photocatalyst with other advanced oxidation processes such as sonolysis, ozonization, electrochemical oxidation and photocatalysis could significantly improve the photocatalytic efficiency of TiO2photocatalyst. This brief review is an up-to-date presentation of the TiO2surface modification for enhancing its photocatalytic activities for environmental purification.

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Pichat, P., J. Disdier, C. Hoang-Van, D. Mas, G. Goutailler, and C. Gaysse. "Purification/deodorization of indoor air and gaseous effluents by TiO2 photocatalysis." Catalysis Today 63, no. 2-4 (December 2000): 363–69. http://dx.doi.org/10.1016/s0920-5861(00)00480-6.

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PERAL, J., X. DOMENECH, and D. F. OLLIS. "ChemInform Abstract: Heterogeneous Photocatalysis for Purification, Decontamination, and Deodorization of Air." ChemInform 29, no. 4 (June 24, 2010): no. http://dx.doi.org/10.1002/chin.199804258.

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Fiorenza, Roberto, Marcello Condorelli, Luisa D’Urso, Giuseppe Compagnini, Marianna Bellardita, Leonardo Palmisano, and Salvatore Scirè. "Catalytic and Photothermo-catalytic Applications of TiO2-CoOx Composites." Journal of Photocatalysis 1, no. 1 (October 2, 2020): 3–15. http://dx.doi.org/10.2174/2665976x01666200219113505.

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Objective: The necessity to have green and sustainable industrial processes has promoted new technologies for air and water purification together with the research of new energy sources. In this contest, the TiO2-based photocatalysis can be considered a promising route for both environmental applications aIn this work, we have investigated the photocatalytic performance of TiO2-CoOx composites on both photooxidation and photoreduction reactions. Specifically, we have compared the performance of the composites in the thermo-catalytic, photo-catalytic and photothermal-catalytic oxidation of ethanol chosen as model volatile organic compound (VOC) and in the photocatalytic hydrogen production by simulated solar light from aqueous solution of ethanol.nd hydrogen production through water splitting. Background: The necessity to have green and sustainable industrial processes has promoted new technologies for air and water purification together with the research of new energy sources. In this contest, the TiO2-based photocatalysis can be considered a promising route for both environmental applications and hydrogen production through water splitting. Methods: The samples were prepared with a simple impregnation method, and were characterized by Scanning Electron (SEM) and Transmission Electron (TEM) microscopies, X-ray powder diffraction (XRD), N2 adsorption-desorption measurements, Temperature Programmed Reduction in hydrogen (H2- TPR) and X-ray Photoelectron (XPS), Raman, UV-Vis Diffuse Reflectance (UV-Vis DRS) and Photoluminescence (PL) spectroscopies. The catalytic and photocatalytic activity were carried out on pyrex reactors irradiated with a solar lamp and analyzing the reactions products through gas chromatography. Results: The presence and the amount of cobalt oxide were found crucial in determining the performance of the TiO2-based composites for both the catalytic and photocatalytic processes. In particular, the addition of 1 weight percent of CoOx led to the best performance in the photocatalytic processes, whereas a higher amount was beneficial in the thermo-catalytic tests. The multi-catalytic approach based on the synergistic effect of photocatalysis and thermocatalysis in the presence of the TiO2-1%CoOx sample allowed the temperature necessary to obtain 50% ethanol conversion and 50% yield in CO2 to be reduced by 40°C and 50°C, respectively. The same sample was also the best catalyst for photocatalytic solar H2 production. Conclusion: The presence of small amounts of cobalt oxide leads to an efficient composite with TiO2 facilitating the space charge separation and increasing the lifetime of the generated photoholes and electrons. The wide versatility of TiO2-CoOx catalysts both for photooxidation and photoreduction reactions motivates to further exploit the use of these systems in real solar-driven photocatalysis.

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Fathy, Alaa, Marie Le Pivert, Young Jai Kim, Mame Ousmane Ba, Mazen Erfan, Yasser M. Sabry, Diaa Khalil, Yamin Leprince-Wang, Tarik Bourouina, and Martine Gnambodoe-Capochichi. "Continuous Monitoring of Air Purification: A Study on Volatile Organic Compounds in a Gas Cell." Sensors 20, no. 3 (February 10, 2020): 934. http://dx.doi.org/10.3390/s20030934.

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Air pollution is one of the major environmental issues that humanity is facing. Considering Indoor Air Quality (IAQ), Volatile Organic Compounds (VOCs) are among the most harmful gases that need to be detected, but also need to be eliminated using air purification technologies. In this work, we tackle both problems simultaneously by introducing an experimental setup enabling continuous measurement of the VOCs by online absorption spectroscopy using a MEMS-based Fourier Transform infrared (FTIR) spectrometer, while those VOCs are continuously eliminated by continuous adsorption and photocatalysis, using zinc oxide nanowires (ZnO-NWs). The proposed setup enabled a preliminary study of the mechanisms involved in the purification process of acetone and toluene, taken as two different VOCs, also typical of those that can be found in tobacco smoke. Our experiments revealed very different behaviors for those two gases. An elimination ratio of 63% in 3 h was achieved for toluene, while it was only 14% for acetone under same conditions. Adsorption to the nanowires appears as the dominant mechanism for the acetone, while photocatalysis is dominant in case of the toluene.

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Pancielejko, Anna, Marta Rzepnikowska, Adriana Zaleska-Medynska, Justyna Łuczak, and Paweł Mazierski. "Enhanced Visible Light Active WO3 Thin Films Toward Air Purification: Effect of the Synthesis Conditions." Materials 13, no. 16 (August 8, 2020): 3506. http://dx.doi.org/10.3390/ma13163506.

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Taking our current environmental situation in the world into consideration, people should face growing problems of air and water pollution. Heterogeneous photocatalysis is a highly promising tool to improve both air and water quality through decomposition/mineralization of contaminants directly into harmless CO2 and H2O under ambient conditions. In this contribution, we focused on the synthesis of self-assembly WO3 thin films via an electrochemical approach in the aqueous electrolyte containing fluoride ions toward air purification. The effect of preparation conditions such as applied potential (10–50 V), anodization time (15–120 min), concentration of H2SO4 (0.5–1.5 M) and NaF (0.1–1.0 wt.%) on the morphology, photocurrent response, and photocatalytic activity addressed to removal of air pollutant in the presence of as-prepared WO3 samples were thoroughly examined and presented. The results revealed the growth of nanoplatelets and their gradual transformation into flower-like structures. The oxide layers and platelet thickness of the WO3 samples were found to be proportionally related with the synthesis conditions. The photocatalytic ability toward air purification was evaluated by degradation of toluene from air mixture using low-powered LEDs as an irradiation source (λmax = 415 nm). The highest photoactivity was achieved in presence of the sample which possessed a well-ordered, regular shape and repeatable distribution of flower buds (100% of degradation). The results have confirmed that the oxide layer thickness of the anodic WO3 significantly affected the photocatalytic activity, which increased with the increasing thickness of WO3 (to 1.05 μm) and then had a downward trend. The photocurrent response evidenced that the well-organized sample had the highest ability in photocurrent generation under UV-Vis and Vis irradiation. Finally, a possible growth mechanism of WO3 NFs was also discussed.

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Piątkowska, Aleksandra, Magdalena Janus, Kacper Szymański, and Sylwia Mozia. "C-,N- and S-Doped TiO2 Photocatalysts: A Review." Catalysts 11, no. 1 (January 19, 2021): 144. http://dx.doi.org/10.3390/catal11010144.

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This article presents an overview of the reports on the doping of TiO2 with carbon, nitrogen, and sulfur, including single, co-, and tri-doping. A comparison of the properties of the photocatalysts synthesized from various precursors of TiO2 and C, N, or S dopants is summarized. Selected methods of synthesis of the non-metal doped TiO2 are also described. Furthermore, the influence of the preparation conditions on the doping mode (interstitial or substitutional) with reference to various types of the modified TiO2 is summarized. The mechanisms of photocatalysis for the different modes of the non-metal doping are also discussed. Moreover, selected applications of the non-metal doped TiO2 photocatalysts are shown, including the removal of organic compounds from water/wastewater, air purification, production of hydrogen, lithium storage, inactivation of bacteria, or carbon dioxide reduction.

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OCHIAI, Tsuyoshi, Kazuya NAKATA, Taketoshi MURAKAMI, Yuko MORITO, Shunsuke HOSOKAWA, and Akira FUJISHIMA. "Development of an Air-Purification Unit Using a Photocatalysis-Plasma Hybrid Reactor." Electrochemistry 79, no. 10 (2011): 838–41. http://dx.doi.org/10.5796/electrochemistry.79.838.

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Portela, R., R. F. Tessinari, S. Suárez, S. B. Rasmussen, M. D. Hernández-Alonso, M. C. Canela, P. Ávila, and B. Sánchez. "Photocatalysis for Continuous Air Purification in Wastewater Treatment Plants: From Lab to Reality." Environmental Science & Technology 46, no. 9 (April 5, 2012): 5040–48. http://dx.doi.org/10.1021/es2042355.

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Kanth, Namrata, Weiheng Xu, Umesh Prasad, Dharneedar Ravichandran, Arunachala Mada Kannan, and Kenan Song. "PMMA-TiO2 Fibers for the Photocatalytic Degradation of Water Pollutants." Nanomaterials 10, no. 7 (June 30, 2020): 1279. http://dx.doi.org/10.3390/nano10071279.

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Titanium dioxide (TiO2) is a promising photocatalyst that possesses a redox potential suitable for environmental remediation applications. A low photocatalytic yield and high cost have thus far limited the commercial adoption of TiO2-based fixed-bed reactors. One solution is to engineer the physical geometry or chemical composition of the substrate to overcome these limitations. In this work, porous polymethyl methacrylate (PMMA) substrates with immobilized TiO2 nanoparticles in fiber forms were fabricated and analyzed to demonstrate the influence of contaminant transport and light accessibility on the overall photocatalytic performance. The influences of (i) fiber porosity and (ii) fiber architecture on the overall photocatalytic performance were investigated. The porous structure was fabricated using wet phase inversion. The core-shell-structured fibers exhibited much higher mechanical properties than the porous fibers (7.52 GPa vs. non-testability) and maintained the same degradation rates as porous structures (0.059 vs. 0.053/min) in removing methylene blue with comparable specific surface areas. The highest methylene blue (MB) degradation rate (kMB) of 0.116 min−1 was observed due to increases of the exposed surface area, pointing to more efficient photocatalysis by optimizing core-shell dimensions. This research provides an easy-to-manufacture and cost-efficient method for producing PMMA/TiO2 core-shell fibers with a broad application in water treatment, air purification, and volatile sensors.

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Boaretti, Carlo, Giuseppe Vitiello, Giuseppina Luciani, Alessandra Lorenzetti, Michele Modesti, and Martina Roso. "Electrospun Active Media Based on Polyvinylidene Fluoride (PVDF)-Graphene-TiO2 Nanocomposite Materials for Methanol and Acetaldehyde Gas-Phase Abatement." Catalysts 10, no. 9 (September 3, 2020): 1017. http://dx.doi.org/10.3390/catal10091017.

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The abatement of organic pollutants by TiO2 photocatalysis has been established as one of the benchmark applications of advanced oxidation processes for both liquid and gas phase purification. Such solution is particularly suitable for indoor air pollution where volatile organic compounds (VOCs) represent a class of chemicals of high concern for their adverse effects on both environment and human health. However, different shortcomings still affects TiO2 photocatalytic performance in terms of weak adsorptivity and fast electron-hole recombination, limiting its applicability. As a result, different strategies have been investigated over the last years in order to promote a higher TiO2 photo-efficiency. In this study we used electrospun (PVDF) nanofibers as a support for the photo catalytic system obtained by coupling graphene based materials and TiO2 during solvothermal synthesis. The resultant nanostructured membranes have been tested for acetaldehyde and methanol degradation under UV light showing an increase in the photocatalytic activity compared to bare TiO2. Such results may be ascribed to the decrease of band-gap energy and to increased electron mobility in the photocatalytic nanocomposite.

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Chen, Aicheng. "Electrocatalysis and photoelectrochemistry based on functional nanomaterials." Canadian Journal of Chemistry 92, no. 7 (July 2014): 581–97. http://dx.doi.org/10.1139/cjc-2014-0147.

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Catalysis plays a key role in chemical production, energy processing, air purification, water treatment, food processing, and the life sciences. Nanostructured materials with high surface areas and some unique properties have received widespread interest in electrocatalysis and photocatalysis. Recently, the author’s research team has designed and studied a variety of novel functional nanomaterials. This review article is derived from the author’s 2013 Canadian Catalysis Lectureship Award Lecture and focuses primarily on the electrocatalytic activities of platinum- and palladium-based nanomaterials and the development of TiO2-based nanostructured photocatalysts. Palladium possesses several exceptional properties that may enable promising applications in hydrogen detection, purification, and storage. The significant roles of palladium-based nanomaterials in facilitating the growth of a hydrogen economy are addressed. As platinum-based catalysts are vital to the development of fuel cells and sensors, the design of high-performance platinum-based electrocatalysts is highlighted. Additionally, TiO2 is considered to be one of the most promising photocatalysts due to its nontoxicity, high stability, and cost effectiveness. The modification of TiO2 nanomaterials to achieve visible light response is discussed as well. It is anticipated that the development of advanced functional nanostructured catalysts will further improve the efficiency and reduce the cost of electrochemical and photochemical processes, making them more attractive in addressing the pressing global energy and environmental issues.

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CHEN, CHUANSHENG, QUN FANG, SHIYI CAO, and YONGXIANG YAN. "PHOTOCATALYTIC PROPERTY AND PHOTOCATALYTIC MECHANISM OF TiO2/Fe2O3 HYBRIDS FOR DEGRADATION OF ORGANIC DYES." Surface Review and Letters 26, no. 05 (June 2019): 1850196. http://dx.doi.org/10.1142/s0218625x18501962.

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In order to consider the performance enhancement and feasibility of practical application, this research work discussed the effects of different ions on the photocatalytic activity of TiO2/Fe2O3 hybrids in detail, involving H[Formula: see text], OH−, NH[Formula: see text], and NO[Formula: see text]. The TiO2/Fe2O3 hybrids were prepared by organic electrolyte-assisted sol–gel method under UV irradiation, and their function mechanisms were analyzed. Experiment results show that the resultant TiO2/Fe2O3 hybrids possess excellent photocatalytic activity and photocatalytic stability for degradation of organics under acid condition (pH 2–8). Notably, the NO[Formula: see text] ions could accelerate degradation of rhodamine B and methyl orange, and the recyclability of TiO2/Fe2O3 hybrids can be greatly enhanced in the co-existence of NO[Formula: see text] and NH[Formula: see text]. Meanwhile, this symbiosis of NO[Formula: see text] and NH[Formula: see text] is proven able to buffer the solution pH in photocatalysis. Furthermore, the prominent photocatalytic activity of TiO2/Fe2O3 hybrids for organic pollutants was mainly attributed to the formation of hydroxyl radicals (OH). The synthetic products show great potential applications in purification of air or wastewater that contains ammonia-nitrogen molecules.

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Tryba, Beata, Piotr Rychtowski, Agata Markowska-Szczupak, and Jacek Przepiórski. "Photocatalytic Decomposition of Acetaldehyde on Different TiO2-Based Materials: A Review." Catalysts 10, no. 12 (December 15, 2020): 1464. http://dx.doi.org/10.3390/catal10121464.

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Purification of air from the organic contaminants by the photocatalytic process has been confirmed to be very perspective. Although many various photocatalysts have been prepared and studied so far, TiO2 is still the most commonly used, because of its advantageous properties such as non-toxicity, relatively low cost and high stability. Surface modifications of TiO2 were extensively proceeded in order to increase photocatalytic activity of the photocatalyst under both UV and visible light activations. The intention of this review paper was to summarize the scientific achievements devoted to developing of TiO2-based materials considered as photocatalysts for the photocatalytic degradation of acetaldehyde in air. Influence of the preparation and modification methods on the parameters of the resultant photocatalyst is reviewed and discussed in this work. Affinity of the photocatalyst surfaces towards adsorption of acetaldehyde will be described by taking into account its physicochemical parameters. Impact of the contact time of a pollutant with the photocatalyst surface is analyzed and discussed with respect to both the degradation rate and mineralization degree of the contaminant. Influence of the photocatalyst properties on the mechanism and yield of the photocatalytic reactions is discussed. New data related to the acetaldehyde decomposition on commercial TiO2 were added, which indicated the different mechanisms occurring on the anatase and rutile structures. Finally, possible applications of the materials revealing photocatalytic activity are presented with a special attention paid to the photocatalytic purification of air from Volatile Organic Compounds (VOCs).

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Lv, Jinze, and Lizhong Zhu. "Highly efficient indoor air purification using adsorption-enhanced-photocatalysis-based microporous TiO2at short residence time." Environmental Technology 34, no. 11 (June 2013): 1447–54. http://dx.doi.org/10.1080/09593330.2012.752875.

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Alva-Araujo, Jean Poll, María de los Ángeles García-Hernández, Asunción Guadalupe Morales Mendoza, and Refugio Rodríguez-Vázquez. "Assessment of a Photoreactor with Immobilized Nanoparticle TiO2 Films for the Purification of Rainwater." Environmental and Earth Sciences Research Journal 8, no. 2 (June 30, 2021): 81–85. http://dx.doi.org/10.18280/eesrj.080203.

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The heterogeneous photocatalysis consists of the generation of reactive oxygen species (•OH, •-O2) from a catalyst, UV light, and oxygen; these reactive species can degrade contaminants and eliminate microorganisms. The purpose of this research was to evaluate a heterogeneous photocatalysis system and an UV light disinfection system for the elimination of total coliforms and Escherichia coli bacteria present in rainwater stored in five cisterns in Mexico City. The elimination of total coliforms (MPN/100 mL) and Escherichia coli (CFU/100 mL) were evaluated both in the rainwater treated with TiO2/UV and UV (in time periods of 30 and 60 minutes), according to the treatments established in the statistical model 22. The results show that although complete elimination of initial total coliforms (9.3 x 104 MPN/100 mL) and E. coli bacterium (1.5 x 103 CFU/mL) was achieved in one of the samples of rainwater using only UV light at 254 nm for 30 minutes, the use of 8 films coated with Degussa P-25 titanium dioxide, UV light at 254 nm and 1.5 vvm air in a reactor, achieves a total pathogen removal in a shorter time of 15 minutes. Thus, we anticipate that the combined treatment could be an alternative disinfection process for rainwater stored in cisterns, reducing costs and making the treatment viable for a larger-scale application.

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Li, Di, Hajime Haneda, Shunichi Hishita, and Naoki Ohashi. "Visible-Light-Driven N−F−Codoped TiO2Photocatalysts. 2. Optical Characterization, Photocatalysis, and Potential Application to Air Purification." Chemistry of Materials 17, no. 10 (May 2005): 2596–602. http://dx.doi.org/10.1021/cm049099p.

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Freudenhammer, H., D. Bahnemann, L. Bousselmi, S. U. Geissen, A. Ghrabi, F. Saleh, A. Si-Salah, U. Siemon, and A. Vogelpohl. "Detoxification and recycling of wastewater by solar-catalytic treatment." Water Science and Technology 35, no. 4 (February 1, 1997): 149–56. http://dx.doi.org/10.2166/wst.1997.0107.

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An introduction to a joint research project is given which deals with the technical application of solar photocatalysis for wastewater detoxification. A non-concentrating thin-film fixed-bed reactor (TFFBR) is used to study applications and areas where a solar-catalytic treatment or recycling of wastewater is possible. This reactor excels by its low cost and an easy-to-build construction using molecular oxygen in air as the oxidising agent. The design parameters of the reactor as well as the process itself have been determined from the reaction kinetics of a model substance, the hydrodynamics and the mass transfer. The treatment of different real wastewaters was successfully carried out, and biologically pre-treated textile wastewater maximum solar degradation rate was about 3 g COD h−1 m−2. A comparison of reaction rates with artifical and solar illumination shows the necessity of outdoor experiments. Due to the reaction rates observed, photocatalysis is suitable as the final stage of purification of biologically or physically pretreated wastewater and will offer a great opportunity for sunrich areas.

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Uchida, Yoshihisa, Shuntaro Higa, Yoshiyuki Uchida, and Niichi Hayashi. "Mechanical Properties of TiO₂-Kaolin FGM Produced by Progressive Lamination Method for NO_x Reduction." Materials Science Forum 492-493 (August 2005): 293–98. http://dx.doi.org/10.4028/www.scientific.net/msf.492-493.293.

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Mechanical properties of TiO2-Kaolin Functionally Graded Materials (FGMs) that combined TiO2 and Korean kaolin (Al2Si2O5(OH)4) in a graded distribution were experimentally investigated. TiO2 is an excellent photocatalysis material, however, it does not have the mechanical strength sufficiently. Therefore, FGMs were used as the photocatalysis materials with mechanical strength. To improve the mechanical properties, Korean kaolin was selected as a binder. Bulk FGMs were produced by vacuum filtration and compression involving wet filtration, mechanical compression and sintering. By this process, it is easy to control the thickness of FGMs. The porosity in FGM depends on the content of TiO2. The porosity in FGM decreases with increasing pressure of the compressor. The shrinkage decreases with increasing compression pressure at all ratios of TiO2 and kaolin. The materials have almost no shrinkage at 10 MPa. The bending strength and the Young’ modulus depends on content of TiO2. The bending strength of material was found to be approximately 2.5 MPa for 10 MPa compression pressure at TiO2 side. The bending strength and the Young’ modulus increases with increasing compression pressure. These results indicate that kaolin particles are useful to improve the strength of FGM. These properties of FGM, such as porosity, shrinkage, mechanical strength, etc., can be controlled by content of TiO2 and compression pressure. Based on an optimal design of production conditions, FGMs were developed for the nitrogen oxides (NOx) removal. The NOx reduction increases with increasing compression pressure. NO of 11.7 mg/m2h was removed under present conditions. The sintering temperature ensured the optimal removal of NOx was 800 oC. After NOx removal test, the FGMs were found to be free from erosion due to photocatalysis. And kaolin particles do not interfere in photocatalysis effect of TiO2. It can be concluded that TiO2-Kaolin FGM have a possibility for application to the air purification.

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LI, HUIHUI, SHU YIN, YUHUA WANG, and TSUGIO SATO. "CURRENT PROGRESS ON PERSISTENT FLUORESCENCE-ASSISTED COMPOSITE PHOTOCATALYSTS." Functional Materials Letters 06, no. 06 (November 27, 2013): 1330005. http://dx.doi.org/10.1142/s1793604713300053.

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Long afterglow phosphors-assisted novel photocatalysts appear to be a series of promising functional materials, which have high utilization efficiency of solar light in practical application of environmental purifications. In this review paper, the recent progress on fluorescence-assisted composite type photocatalysts includes TiO 2-based and Ag 3 PO 4-based fluorescence photocatalyst composites with full-time active photocatalytic properties is reviewed. This fundamental understanding shows that excellent visible light induced photocatalysts coupled with an appropriate amount of long afterglow phosphors could continuously degrade pollutants in air and solution not only under light irradiation, but also after turning off the lamp irradiation for several hours, indicating the possibility of a full-time-active highly efficient photocatalysts system. A promising strategy involving coupling of a highly efficient visible light responsive photocatalyst with an appropriate long afterglow phosphor might be established.

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Seo, Hyeon Jin, Ji Won Lee, Young Hoon Na, and Jin-Hyo Boo. "Enhancement of Photocatalytic Activities with Nanosized Polystyrene Spheres Patterned Titanium Dioxide Films for Water Purification." Catalysts 10, no. 8 (August 5, 2020): 886. http://dx.doi.org/10.3390/catal10080886.

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For environmental applications, such as water and air purification utilizing photocatalysts, we synthesized patterned titanium dioxide (TiO2) thin films using polystyrene (PS) spheres. This was primarily done to enhance the surface area and photocatalytic activities. TiO2 thin films were deposited on silicon wafers attached to variously sized PS spheres via the spin coating method and were annealed at 600 °C. The processing step involved patterning and coating a TiO2 sol–gel. The photocatalytic performance was analyzed using an UV–visible spectrophotometer. Within 20 min, a high catalytic efficiency (98% removal) with a 20-time faster decomposition rate of the malachite green (MG) solution than that of the nonpatterned TiO2 was obtained from the patterned TiO2 with 400 nm sized PS due to the large surface area. In addition, the phenol in the water removed as much as 50% within 2 h with the same photocatalyst, which was expected to be one of the strong candidates to be applied to the next generation of photocatalysts for water purification.

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Sun, Yu Xin, and Jin Zhang. "Photocatalytic Degradation of Methyl Orange and Phenol by BiVO₄-Loaded Fly Ash Cenospheres (FACs) Composite." Advanced Materials Research 821-822 (September 2013): 471–75. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.471.

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A novel photocatalyst, BiVO4-loaded fly ash cenospheres (BFACs), was prepared by the modified metalorganic decomposition (MOD) method. Its physicochemical properties were characterized by X-ray diffractometry (XRD), Raman spectroscopy, scanning electron microscopy with energy dispersive X-ray microanalyses (SEM-EDX) and UV-vis diffused reflectance spectroscopy (DRS). The photocatalytic activities of the as-prepared sample were evaluated by the photodegradation methyl orange (MO) dye and phenol in aqueous solution under visible-light irradiation. It was found that the photocatalytic activity of BFACs composite for the degradation of MO and phenol were higher than that of pure BiVO4. Moreover, much enhanced photocatalytic performance for phenol degradation was also realized with the assistance of H2O2. The BFACs photocatalysts were stable and maintained high photocatalytic efficiency of MO during repeated recycles. The BFACs photocatalyst is promising for practical applications in purification of dye-containing wastewater.

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Li, Si Fang, and Guo Liang Ye. "Photocatalytic Degradation of Formaldehyde by TiO₂ Nanoparticles Immobilized in Activated Carbon Fibers." Advanced Materials Research 482-484 (February 2012): 2539–42. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.2539.

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Activated carbon fibers supported TiO2 nanoparticle photocatalyst was prepared by immersing activated carbon fibers in water suspended with TiO2 nanoparticles under sonication. X-ray diffraction and scanning electron microscopy were applied to characterize the crystallinity and morphology of the photocatalyst. The photocatalytic activity of the prepared photocatalyst was evaluated by the photodegradation of formaldehyde for indoor air purification. The result showed that the low-concentration formaldehyde in the polluted indoor air could be photocatalytically degraded over the prepared photocatalyst, with the formaldehyde concentration in the product air falling into the standard range that is specified by the Chinese Indoor Quality Standard.

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V.V., Kurylev, and Vladimirov S.N. "Factors affecting the efficiency of the catalytic purification of air from pollutants." Ekologiya i stroitelstvo 1 (2015): 15–18. http://dx.doi.org/10.35688/2413-8452-2015-01-004.

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In the article, the influence of the intensity of ultraviolet radiation to the media photocatalytic air purification. Conducted research and made a choice of material based on its durability performance, resistance and efficiency of air purification. It is noted that the substrate can be nonwoven materials, glass balls of various size, porous ceramics, paper, etc. Defined methods of applying the photocatalyst to the carrier material. Designed and manufactured experimental setup to determine the static resistance to air flow. Reviewed the design of the experimental setup to determine the static resistance to air flow. Based on the obtained results we note that the minimum resistance to any air flow creates a synthetic non-woven material based on polyethylene terephthalate. Nonwoven fabric based on natural wool keeps the particles of photocatalyst and creates a relatively small resistance at high speed air flow. Media made from sintered glass beads do not lose the nanoparticles at any speed of flow.

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Peng, Zhen, Li Zhang, Chun Sheng Wang, and Ke Fu Yao. "A Research on Purification of Oily Wastewater with TiO₂ Photocatalysts Supported by Zeolite Particles." Advanced Materials Research 953-954 (June 2014): 1017–21. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.1017.

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It is well-known that TiO2is an environmental benign photocatalyst which can be used to decompose harmful organic compounds. Recently, many studies are concentrated on the purification of industrial wastewater due to the requirement of environmental protection. In present study, TiO2nanomaterials supported by fine zeolite particles have been used as the photocatalyst to purify the oily wastewater. It has been found that the oil concentration in the modulated water can be reduced significantly and rapidly under the action of photocatalytic degradation and the ultraviolet light radiation. After 80 minutes, oil concentration in the modulated water can be reduced by more than 80%. The results suggest that TiO2nanomaterials supported by fine zeolite particles are effective material for purification of oily wastewater. In addition, the present results show that the efficiency of water purification can be significantly increased by use of mechanical stirring during the photocatalytic degradation process.

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43

Li, Ruizhen, Hanyang Chen, Jianrong Xiong, Xiaoying Xu, Jiajia Cheng, Xingyong Liu, and Guo Liu. "A Mini Review on Bismuth-Based Z-Scheme Photocatalysts." Materials 13, no. 22 (November 10, 2020): 5057. http://dx.doi.org/10.3390/ma13225057.

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Recently, the bismuth-based (Bi-based) Z-scheme photocatalysts have been paid great attention due to their good solar energy utilization capacity, the high separation rate of their photogenerated hole-electron pairs, and strong redox ability. They are considerably more promising materials than single semiconductors for alleviating the energy crisis and environmental deterioration by efficiently utilizing sunlight to motivate various photocatalytic reactions for energy production and pollutant removal. In this review, the traits and recent research progress of Bi-based semiconductors and recent achievements in the synthesis methods of Bi-based direct Z-scheme heterojunction photocatalysts are explored. The recent photocatalytic applications development of Bi-based Z-scheme heterojunction photocatalysts in environmental pollutants removal and detection, water splitting, CO2 reduction, and air (NOx) purification are also described concisely. The challenges and future perspective in the studies of Bi-based Z-scheme heterojunction photocatalysts are discussed and summarized in the conclusion of this mini review.

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Zaleska, Adriana, Andreas Hanel, and Michal Nischk. "Photocatalytic Air Purification." Recent Patents on Engineering 4, no. 3 (November 1, 2010): 200–216. http://dx.doi.org/10.2174/187221210794578637.

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Likodimos, Vlassis. "Advanced Photocatalytic Materials." Materials 13, no. 4 (February 11, 2020): 821. http://dx.doi.org/10.3390/ma13040821.

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Semiconductor photocatalysts have attracted a great amount of multidiscipline research due to their distinctive potential for solar-to-chemical-energy conversion applications, ranging from water and air purification to hydrogen and chemical fuel production. This unique diversity of photoinduced applications has spurred major research efforts on the rational design and development of photocatalytic materials with tailored structural, morphological, and optoelectronic properties in order to promote solar light harvesting and alleviate photogenerated electron-hole recombination and the concomitant low quantum efficiency. This book presents a collection of original research articles on advanced photocatalytic materials synthesized by novel fabrication approaches and/or appropriate modifications that improve their performance for target photocatalytic applications such as water (cyanobacterial toxins, antibiotics, phenols, and dyes) and air (NOx and volatile organic compounds) pollutant degradation, hydrogen evolution, and hydrogen peroxide production by photoelectrochemical cells.

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Azira, N. M. N., M. Asri Idris, Dewi Suriyani Che Halin, M. N. B. Derman, and Mohd Arif Anuar Mohd Salleh. "Overview of Pathogenic Micro-Organisms Destruction in Contaminated Water by Oxide Photocatalysis." Advanced Materials Research 795 (September 2013): 483–87. http://dx.doi.org/10.4028/www.scientific.net/amr.795.483.

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The titanium dioxide (TiO2) is a semiconductor oxide photocatalys, which is chemically and biologically inert but exhibits excellent photolytic activity in the ultraviolet (UV) region. Progress in photocatalytic water disinfection requires understanding both concepts of TiO2 semiconductor as well the biochemistry of microorganisms. The advantage and disadvantage for current water purifications are discussed. Finally, the photocatalytic reactions to water disinfection and detoxification using solar energy.

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Ding, Junping, Huanchun Wang, Yidong Luo, Yushuai Xu, Jinsheng Liu, and Yuanhua Lin. "(002) Oriented Bi2O2CO3 Nanosheets with Enhanced Photocatalytic Performance for Toluene Removal in Air." Catalysts 10, no. 4 (April 2, 2020): 389. http://dx.doi.org/10.3390/catal10040389.

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Layer-structured Bi2O2CO3 is a novel photocatalyst for eliminating environmental pollutants. In this work, Bi2O2CO3 nanosheets were synthesized by hydrothermal methods, followed by annealing in nitrogen. (002) oriented Bi2O2CO3 nanosheets were obtained and characterized by XRD, SEM, XPS, BET and UV-Vis diffuse reflectance spectra. Photocatalytic properties were investigated by toluene removal in air, with the assistant of Bi2O2CO3 nanosheets under artificial irradiation. Our results show that Bi2O2CO3 annealed in nitrogen exhibited high full-light-driven photocatalytic activity for toluene photocatalytic decomposition, which may be ascribed to facet orientation evolution during the annealing process and enhanced efficient charge separation. The sample annealed at 150 °C for 8 h (BOC-150-8 h) showed high stability and the highest toluene removal rate, which was up to 99%. The final degradation products were detected by gas chromatography–mass spectrometer (GC-MS) and CO2 was verified to be the primary product. Photocatalytic mineralization of toluene in air over Bi2O2CO3 was proposed. This work may provide a foundation for application of annealed Bi2O2CO3 in indoor air purification.

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Cha, Byeong, Tae Woo, Sang Han, Shahid Saqlain, Hyun Seo, Hong Cho, Jee Kim, and Young Kim. "Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene." Catalysts 8, no. 11 (October 26, 2018): 500. http://dx.doi.org/10.3390/catal8110500.

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Titanium oxide (TiO2) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO2 toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO2 surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO2 does not show deactivation under the conditions that induce significant deactivation with bare TiO2. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO2 and did not result in poisoning of active sites. Our hydrophilic TiO2 shows high potential for application in air purification for extended time, which is not possible using bare TiO2 due to the significant poisoning of active sites.

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Pham, Hai Dinh, Mahider Asmare Tekalgne, Ha Huu Do, Van-Huy Nguyen, Dai-Viet N. Vo, Chin Kui Cheng, Mohammadreza Shokouhimehr, et al. "Emerging photocatalysts for air purification." Materials Letters 288 (April 2021): 129355. http://dx.doi.org/10.1016/j.matlet.2021.129355.

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Wang, Yun Han, Hao Wang, Chang Zhong Zhao, and Yi Zhang. "Research Progress of Air Purifier Principles and Material Technologies." Advanced Materials Research 1092-1093 (March 2015): 1025–28. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.1025.

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This article mainly refers to purification technology and material technology of air purifiers. There are several purification technologies in air purifiers such as HEPA(high efficiency particulate air filter), Mineralization technology of ultra light structure, Negative ion technology, the photocatalyst technology, electrostatic dust collection, Activated carbon adsorption technology and etc. And material technologies are classified as Photocatalyst, Activated carbon, Synthetic fiber, HEPA, Negative ion generator and etc. The paper reviews the characteristics, purification theory, research status and applications of every kind of purification technologies and material technologies. On this basis, we put forward outlook on the future development of air purifier.

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Journal articles on the topic 'Air Purification Photocatalysis'

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