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Journal articles on the topic 'Photocatalytic filter'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Shen, Rongyan, Fang Liu, Te Li, Xia Xu, Yuting Liang, Xingqing Zhao, and Wenyi Zhang. "Treatment of 2-diazo-4, 6-dinitrophenol (DDNP) wastewater using TiO2/SiO2 composite film in new photocatalytic reactor." Chemical Industry and Chemical Engineering Quarterly 21, no. 4 (2015): 493–99. http://dx.doi.org/10.2298/ciceq140609005s.

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TiO2/SiO2 composite film was used to modify the surface of the filter media sintered by coal refuse. 2-Diazo-4,6-dinitrophenol (DDNP) wastewater was used as the response substrate to test its photocatalytic activity in new self-made photocatalytic reactor. The particle morphology and physico-chemical properties of the modified filter media were characterized by the scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The influencing factors of the photocatalytic activity of the modified filter media were studied. When the modified filter media was used, the decolorization rate and COD removal rate of DDNP wastewater reached 70.00% and 60.85%, respectively. But unmodified filter media almost had no photocatalytic activity. The orthogonal experiment showed that the optimal working parameters separately were: 59:1 of Ti/Si in the TiO2/SiO2 composite film, pH 1, 7 ml L-1 H2O2, and 3000 times chroma (equivalent initial concentration of DDNP wastewater). Under the above condition, the decolorization rate and COD removal rate separately reached 98.50% and 92.50% for 1 h photocatalytic reaction. Under the condition of illumination and aeration, the photocatalytic activities were obviously higher than those under only illumination or aeration.

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2

Lei, Xue Fei, Chen Chen, Xing Li, Xiang Xin Xue, and He Yang. "Study on the Preparation Process of Photocatalysts by the Acidolysis of High Titanium Slag with Hydrochloric Acid." Applied Mechanics and Materials 662 (October 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amm.662.3.

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The paper preliminary studied the photocatalytic efficiency of the filter residue of the acidolysis of high titanium slag (RAHTS) with hydrochloric acid, and explored the photocatalytic efficiency on the acid methyl orange solution under the mercury lamp irradiation. With RAHTS performing as a raw material to react with hydrochloric acid, and then the substance content, nature and catalytic efficiency of the filter residues were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and photocatalytic reaction apparatus. Through the experimental investigation, the photocatalytic degradation efficiency on the methyl orange of the filter residues increased with the acid-sludge ratio, reaction time, reaction temperature, and the concentration of hydrochloric acid. When the temperature was 100°C, the reaction time was 4 h, the concentration of the hydrochloric acid was 6 mol/L, the acid-sludge ratio was 1, the filter residues showed a best photocatalytic degradation efficiency. Under that experimental condition, the degradation rate was as high as 85.1%.

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3

Zhang, Wen Yi, Ning Han, Li Rong Yao, Pei Cheng Fan, and Rong Chen. "Studies on SiO₂/TiO₂ Complex Film of the Filter Material Carrier and its Photocatalytic Features." Advanced Materials Research 340 (September 2011): 293–99. http://dx.doi.org/10.4028/www.scientific.net/amr.340.293.

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The nano-SiO2/TiO2complex film was used to implement modification of the surface on the sintered filter material of coal refuse. In the photocatalytic reactor, methyl orange was taken as the response substrate to test the photocatalytic activity and the influence of the different Si/Ti ratios of the complex film on the photocatalytic activity of modified filter material. The Langmuir-Hinshelwood dynamics model was applied to describe the dynamic process during which multiphase photocatalytic modified filter material disassembled the methyl orange. The results indicated that the initial concentration, pH value, aeration illumination condition and the Si/Ti ratios of the complex film were the major influence factors of the efficiency of photocatalytic degeneration. In the acidic environment, and on the illumination and aeration conditions, when the initial concentration of the methyl orange solution was 6mg/L and the Si/Ti ratio was 1/39, the SiO2/TiO2complex film was used to decolor the methyl orange, then the decolorization rate was over 99.8% after 2h.

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4

PIETRZAK, KATARZYNA, and BEATA GUTAROWSKA. "The Effectiveness of Photocatalytic Ionisation Disinfection of Filter Materials." Polish Journal of Microbiology 62, no. 2 (2013): 131–39. http://dx.doi.org/10.33073/pjm-2013-018.

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The purpose of this study was to determine the effectiveness of photocatalytic ionisation as a disinfection method for filter materials contaminated by microorganisms, and to assess how air relative humidity (RH), time and microbe type influence the effectiveness of this disinfection. In the quantitative analysis of a used car air filter, bacterial contamination equalled 1.2 x 10(5) cfu/cm2, fungal contamination was 3.8 x 10(6) cfu/cm2, and the isolated microorganisms were Aspergillus niger, Bacillus megaterium, Cladosporium herbarum, Cryptococcus laurenti, Micrococcus sp., Rhodotorula glutinis and Staphylococcus cohnii. In the model experiment, three isolates (C. herbarum, R. glutinis, S. cohnii) and 3 ATCC species (A. niger, E. coli, S. aureus) were used for photocatalytic ionisation disinfection. The conditions of effective photocatalytic ionisation disinfection (R > or = 99.9%) were established as 2-3 h at RH = 77% (bacteria) and 6-24 h at RH = 53% (fungi). RH has an influence on the effectiveness of the photocatalytic disinfection process; the highest effectiveness was obtained for bacteria at RH = 77%, with results 5% higher than for RH = 49%. The studies show that the sensitivity of microorganisms to photocatalytic ionisation disinfection is ordered as follows: Gram-positive bacteria (S. cohnii, S. aureus), Gram-negative bacteria (E. coli), yeasts (R. glutinis), and moulds (C. herbarum, A. niger). Of all the mathematical models used for the description of death dynamics after photocatalytic ionisation disinfection, the Chick-Watson model is the most useful, but for more resistant microorganisms, the delayed Chick-Watson model is highly recommended. It therefore seems, that the presented disinfection method of photocatalytic ionisation can be successfully used to clean filtration materials.

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5

Chuaybamroong, P., R. Chotigawin, S. Supothina, P. Sribenjalux, S. Larpkiattaworn, and C. Y. Wu. "Efficacy of photocatalytic HEPA filter on microorganism removal." Indoor Air 20, no. 3 (February 26, 2010): 246–54. http://dx.doi.org/10.1111/j.1600-0668.2010.00651.x.

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6

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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7

Dunnill, Charles W. "UV Blocking Glass: Low Cost Filters for Visible Light Photocatalytic Assessment." International Journal of Photoenergy 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/407027.

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A number of commercially available art protection products have been compared and assessed for their suitability as UV blocking filters in the application of “visible light” photocatalytic research. Many groups claiming visible light photocatalytic success employ filters to block out stray UV radiation in order to justify that their photocatalysts are indeed visible light photocatalysts and not UV light photocatalysts. These filters come in varying degrees of ability and price and many authors fail to correctly characterise their filters in individual papers. The use of effective filters to prevent both false positive and false negative results is important to maintain scientific rigor and create accurate understanding of the subject. The optimum UV filter would have the highest UV blocking properties (<390 nm) and simultaneously the highest visible light transmission (390–750 nm). Single and double layers of each of the glass products were assessed as well as laminate products. The conclusions show an inexpensive and highly effective setup for the conduction of visible light photochemistry that should be incorporated as a standard part in any researcher’s work where the claim of visible light activity is made.

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8

Luo, Yongyi, Fuqiang Zhai, Yingchun Zhang, Zhiqian Chen, Mingde Ding, Dajiang Qin, Jinming Yang, Guang Feng, and Lu Li. "A superfine glass fibre air filter with rapid response to photocatalytic antibacterial properties under visible light by loading rGO/ZnO." Royal Society Open Science 8, no. 8 (August 2021): 202285. http://dx.doi.org/10.1098/rsos.202285.

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The development of high-performance air filter has become more and more important to public health. However, it has always been very challenging for developing a multifunctional air filter to simultaneously achieve excellent filtration and antibacterial properties. Herein, a versatile air filter was prepared with loading the reduced graphene (rGO) and zinc oxide on the superfine glass fibre (s-GF) with the three-dimensional network structure by in situ sol–gel process followed by calcination, which aims to achieve synergistic high-efficiency air filtration and rapid response to photocatalytic antibacterial properties under visible light. The air filter showed a three-dimensional network structure based on a rGO/ZnO/s-GF multilayer and exhibited the highest catalytic performance by achieving a 95% degradation effect on rhodamine B within 2 h and achieving 100% antibacterial inactivation of the Escherichia coli and Staphylococcus aureus within 4 h under visible light when the weight ratio of rGO in rGO/ZnO is 1.6%. The air filtration efficiency can also be maintained at 99% after loading ZnO and rGO photocatalytic particles. The spectrum of the photoluminescence (PL), UV-Vis diffuse reflectance spectra (DRS) and electron spin resonance (ESR) indicate that the combination of rGO and ZnO on the s-GF can increase the separation of photogenerated carriers and the specific surface area of the air filter, thereby increasing the photocatalytic response and antibacterial properties of the s-GF air filter under visible light in a short time.

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9

Wadchasit, Pornwimon, Wipawee Khamwichit, and Wipada Sanongraj. "The Synthesis of Air Filters from Silk Cocoons Coated TiO₂ for Use in Air Purifier." Advanced Materials Research 931-932 (May 2014): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.281.

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The purpose of this research was to synthesize and form fibroin silk air filter (SF filter) coated and non-coated with titanium dioxide. For use in indoor air pollution treatment. The main air pollutant to be treated is PM2.5. However, VOC removal also investigaed in this study. The synthesis involved degumming process using 0.5 wt % Na2CO3 at 90°C for 60 minutes. Titanium dioxide (TiO2) used in the study was a catalyst Tipaque brand (code A-220 (Anatase)). Results from studying on physical property by scanning electron microscope found that silk fibre was an ununiformly arrangement structure. SF filter coated with TiO2 showed that TiO2 distributed uniformly on the filter. The silk fibroin filters were brought to analyze for the energy band gap in order to find the energy value that the catalyst was needed to stimuate reaction in the photocatalytic process. It was found that TiO2 1-7.5 %(w/v) catalyst coated on the silk fibroin filters had the highest value of light absorption at 390 nanometers, which agreed with the value of energy level in the band gap period of 3.18 eV.The results from efficiency studies of SF filters in the treatment of indoor air pollution (generated from incense fume of 0-2 micron in size) indicated that the best treatment efficiency was 99.76%. In which SF filter non-coated with TiO2 was used, and initial PM2.5 concentration was 5 mg/m3, air flow rate was 3.93 m3/min. Treatment period was 8 hours.

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10

Xu, Zhixiang, Jianyuan Zhang, Haiqin Liu, Pengpeng Kuang, Shuang Wang, and Xiaoqi Fu. "Preparation of silver/silver bromide/titanium dioxide/graphene oxide nanocomposite for photocatalytic degradation of 4-chlorophenol." Nanomaterials and Nanotechnology 7 (January 1, 2017): 184798041772404. http://dx.doi.org/10.1177/1847980417724046.

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A ultaviolet–visible light responded photocatalytic nanocomposite, silver/silver bromide/titanium dioxide, supported on graphene oxide (GO; silver/silver bromide/titanium dioxide/GO) was fabricated via a layer intercalation method using n-butylamine, cetyltrimethyl ammonium bromide, titanium dioxide and silver/silver bromide-intercalated GO successively. The resultant silver/silver bromide/titanium dioxide/GO exhibited much stronger visible light absorption and enhanced photocatalytic efficiency than titanium dioxide/GO and titanium dioxide. Furthermore, the degradation efficiency of silver/silver bromide/titanium dioxide/GO was improved when irradiated under light without the ultaviolet cut filter. The apparent degradation rate constants, k, for silver/silver bromide/titanium dioxide/GO, titanium dioxide/GO and titanium dioxide are 0.5192, 0.2273 and 0.0627 h−1. A possible photocatalytic degradation mechanism for degradation of 4-chlorophenol by silver/silver bromide/titanium dioxide/GO under irradiation with/without the ultaviolet cut filter was proposed. The factors including the visible light response from silver bromide, surface plasmon ‘hot’ electron effect from silver nanoparticles and efficient electron transfer among silver, silver bromide, titanium dioxide and GO are contributed to enhance the photocatalytic activity under visible light irradiation, while the additional factor of ultaviolet light response from titanium dioxide plays an important role under light irradiation without the ultaviolet cut filter. The resultant silver/silver bromide/titanium dioxide/GO possessed a good photochemical stability and reusability.

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11

MURAKAMI, Eizo, Hitoshi KOHNO, Masahiro HORI, and Daisuke ONO. "Removal characteristics of formaldehyde by the TiO2/photocatalytic filter." Journal of Japan Association on Odor Environment 37, no. 1 (2006): 23–32. http://dx.doi.org/10.2171/jao.37.23.

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12

Horváth, Endre, Lídia Rossi, Cyprien Mercier, Caroline Lehmann, Andrzej Sienkiewicz, and László Forró. "Photocatalytic Nanowires‐Based Air Filter: Towards Reusable Protective Masks." Advanced Functional Materials 30, no. 40 (August 7, 2020): 2004615. http://dx.doi.org/10.1002/adfm.202004615.

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13

Battistin, Mattia, Elisa Durini, Valeria Dissette, Alessandro Bonetto, Antonio Marcomini, Elisa Casagrande, Andrea Brunetta, et al. "Synthesis and Characterization of New Multifunctional Self-Boosted Filters for UV Protection: ZnO Complex with Dihydroxyphenyl Benzimidazole Carboxylic Acid." Molecules 24, no. 24 (December 12, 2019): 4546. http://dx.doi.org/10.3390/molecules24244546.

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The incidence of skin cancer is increasing both because of climate change and the increase in pollution than people’s incorrect habits of sun exposure. In these regards, sunscreen and photoprotection are essential tools in consenting the benefits induced by safe solar light exposition and skin cancer prevention. In this work, a new class of sunscreen filter was synthesized by chemical combination of a physical filter (ZnO) and Oxisol (dihydroxyphenyl benzimidazole carboxylic acid), an antioxidant molecule with booster effect. In this work, a new class of filters with new properties was achieved by direct functionalization of particles surface. A full characterization of this multifunctional ingredient (ZnO–Ox) was conducted: Compared with the simple mixture, the new filter acts as a multifunctional molecule showing a higher Sun Protection Factor (SPF), a better cytotoxic profile (MTT and NRU assay), and anti-acne activity. A strong reduction of photocatalytic activity of ZnO was observed, also improving the safety profile.

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14

Tani, Eiji. "Decomposition of Orange II with Si/SiC-TiO₂ Fine Open-Cell Photocatalytic Filter." Advances in Science and Technology 45 (October 2006): 2159–62. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2159.

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Lightweight fine open-cell porous Si/SiC ceramic filter was fabricated using polyurethane sponge. The thickness of the strut and the cell size of porous Si/SiC ceramics were almost the same size of the original sponge. This porous ceramic was an ideal structure for photocatalyst supports. The contact probability between photocatalyst and pollutant could be easily increased by using this ceramic filter coated with photocatalyst. The TOC value of Orange II solution, coloring matter, could decrease remarkably using this photocatalytic ceramic filter and germicidal lamp.

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15

Siriorn, Isarankura Na Ayutthaya, and Wootthikanokkhan Jatuphorn. "Investigation of Morphology and Photocatalytic Activities of Electrospun Chicken Feather Keratin/PLA/TiO2/Clay Nanofibers." E3S Web of Conferences 141 (2020): 01003. http://dx.doi.org/10.1051/e3sconf/202014101003.

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This research has focused on the fabrication of electro spun-keratin base composite nanofiber, in order to develop the organic dye removal filters. The filters were prepared from a keratin-base material, which was extracted from chicken feathers. A biodegradable polymer including Poly (lactic acid) was blended into keratin to improve fibre process-ability. Titanium dioxide (anatase) and clay (Na-montmorillonite) were mixed into the PLA/Keratin blended solution prior to fabrication into non-woven fibre using the electro-spinning process. The objective of this research was to study the effect of TiO2 and clay on the process-ability, the morphology, and the filter efficiency (methylene blue removal) of the fibres. SEM images showed the morphology of small PLA/Keratin/clay-base fibres. SEM-scan mapping EDX technique showed a good dispersion of keratin, clay and TiO2 along the fibres. XRD pattern also showed the existence of PLA, keratin and TiO2. But the peak of clay was not strong enough. However, the evidence of clay was clearly shown by SEM-EDX technique as reported above. The capability to remove organic dye (methylene blue) was investigated by using UV-Vis spectrophotometer technique. From all of our results, it can be concluded that PLA/Keratin/TiO2/clay is an effective filter for the removal of organic dye from wastewater.

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Romero, Violette, Pilar Marco, Jaime Giménez, and Santiago Esplugas. "Adsorption and Photocatalytic Decomposition of theβ-Blocker Metoprolol in Aqueous Titanium Dioxide Suspensions: Kinetics, Intermediates, and Degradation Pathways." International Journal of Photoenergy 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/138918.

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This study reports the photocatalytic degradation of theβ-blocker metoprolol (MET) using TiO2suspended as catalyst. A series of photoexperiments were carried out by a UV lamp, emitting in the 250–400 nm range, providing information about the absorption of radiation in the photoreactor wall. The influence of the radiation wavelength on the MET photooxidation rate was investigated using a filter cutting out wavelengths shorter than 280 nm. Effects of photolysis and adsorption at different initial pH were studied to evaluate noncatalytic degradation for this pharmaceutical. MET adsorption onto titania was fitted to two-parameter Langmuir isotherm. From adsorption results it appears that the photocatalytic degradation can occur mainly on the surface of TiO2. MET removed by photocatalysis was 100% conditions within 300 min, while only 26% was achieved by photolysis at the same time. TiO2photocatalysis degradation of MET in the first stage of the reaction followed approximately a pseudo-first-order model. The major reaction intermediates were identified by LC/MS analysis such as 3-(propan-2-ylamino)propane-1,2-diol or 3-aminoprop-1-en-2-ol. Based on the identified intermediates, a photocatalytic degradation pathway was proposed, including the cleavage of side chain and the hydroxylation addition to the parent compounds.

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Shen, Rongyan, Guoyong Feng, Yuting Liang, Xingqing Zhao, and Wenyi Zhang. "Influence factors of photocatalytic activity of the filter media modified by TiO2." Chemical Industry 68, no. 6 (2014): 809–18. http://dx.doi.org/10.2298/hemind131017010s.

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The gangue filter media was modified by the titanium dioxide (TiO2) through the liquid phase deposition method. Some influence factors of photocatalytic activity were investigated, including the mole ratio of initial solution, the water bath temperature, the deposition time, the calcination temperature, and the heat preservation time of calcination. The morphology of the film was examined by SEM, EDS, and crystallite structure by X-Ray Diffraction (XRD). The SEM, EDS, and XRD data showed that new TiO2 crystal was found in the modified filter media. And the specific surface area of the modified filter media greatly increased. By the orthogonal experiment, the optimum parameters of modification were (NH4)2TiF6:H3BO3=1:2, water bath temperature of 80?C, deposition time of 5h, calcination temperature of 500?C, and 1h heat preservation time of calcination. Under above conditions, the heavy nitrogen wastewater of 1589.94 mg/L COD and 18750 times chroma was treated by the modified filter media. After 1h catalytic reaction, the decolorization rate and COD removal rate reached 65.89% and 47.87%, respectively.

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18

Zhang, Ren-Yao, and Gen-Wen Hsieh. "Electrostatic polyester air filter composed of conductive nanowires and photocatalytic nanoparticles for particulate matter removal and formaldehyde decomposition." Environmental Science: Nano 7, no. 12 (2020): 3746–58. http://dx.doi.org/10.1039/d0en00683a.

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A dual-functional polyester fibrous air filter composed of self-assembled TiO₂ nanoparticles and percolated Ag nanowires for electrostatic particulate matter removal and photocatalytic formaldehyde decomposition is reported.

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Del Curto, Barbara, Paolo Tarsini, and Alberto Cigada. "Development of a photocatalytic filter to control indoor air quality." Journal of Applied Biomaterials & Functional Materials 14, no. 4 (2016): 0. http://dx.doi.org/10.5301/jabfm.5000336.

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20

Xiong, Mingwen, Ying Tao, Zhishu Zhao, Qiong Zhu, Xiaoqi Jin, Shengqiang Zhang, Ming Chen, and Guisheng Li. "Porous g-C3N4/TiO2 foam photocatalytic filter for treating NO indoor gas." Environmental Science: Nano 8, no. 6 (2021): 1571–79. http://dx.doi.org/10.1039/d1en00318f.

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21

Kondo, Masaki, and Teruo Asaoka. "Preparation of Photocatalytic TiO₂ Filter by Chemical Surface Treatment from Ti Non-Woven Fabric." Advanced Materials Research 409 (November 2011): 793–96. http://dx.doi.org/10.4028/www.scientific.net/amr.409.793.

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Photocatalytic titanium dioxide (TiO2) filter was prepared by hydrothermal treatment in NaOH (8M) at 80°C followed by ion exchange in HCl (0.1M), and calcination at 400°C from Ti non-woven fabric (NIKKO TECHNO, Ltd.). Ti non-woven fabric is made of metallic Ti fibers. The surface area of the fabric is several times larger than flat Ti plate, so the TiO2 filter prepared from it should have high degradation ability of organic pollutants by photocatalyst. And we thought it could be applied for the filter to purify air or water. The sample was investigated by scanning electron microscope (SEM), and energy dispersive x-ray spectrometer (EDS). The photocatalytic activity of the sample was evaluated by degradation of methylene blue (MB) solution. The change of concentration of MB solution was measured by ultraviolet visible spectrometer (UV-vis). After the hydrothermal treatment, micro network structure layer was formed on the surface of Ti. The structure was maintained after heat treatment. The elements of the layer after heat treatment were Ti and O. The sample exhibited the degradation ability of MB solution. We tried to hybridize of the TiO2 filter and hydroxy apatite (HAp : Ca10(PO4)6(OH2) ) to improve degradation efficiency by adsorption ability of HAp. The hybrid material of them were prepared by soaking the TiO2 filter into simulated body fluid (SBF) at 37.5°C for 1~7d. Then, HAp particles were formed on the surface of the TiO2 filter. But the degradation ability was lower than non-hybrid sample.

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Teng, Tun-Ping, Tun-Chien Teng, and Shu-I. Pan. "Degradation of Gaseous Formaldehyde by Visible Light-Responsive Titania Photocatalyst Filter." International Journal of Photoenergy 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/739734.

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A method is proposed that uses electrophoretic deposition (EPD) to fabricate the titania (TiO2) photocatalyst filter and then successfully modifies it by lithium nitrate (LiNO3) to be visible light responsive such that the modified photocatalyst filter effectively degrades gaseous formaldehyde. The performance of degrading gaseous formaldehyde is evaluated in the photocatalytic circulation reactor for different temperature and light sources. The results show that the modified TiO2photocatalyst filter has much better degradation performance for gaseous formaldehyde than the original TiO2photocatalyst filter regardless of light source, and the performance is better at the higher ambient temperature. The best total average degradation performance of the modified photocatalyst filter is about 9.2% and 16.3% higher than the original photocatalyst filter (P-25, Degussa) for the UVA and visible irradiation, respectively, at 26°C.

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Liu, Huang, Yanhua Zhang, Hongtao Yang, Wei Xiao, and Lanlan Sun. "Study on Synthesis and Photocatalytic Activity of Porous Titania Nanotubes." Advances in Materials Science and Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/3532817.

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Using the common natural cellulose substance (filter paper) and triblock copolymer (Pluronic P123) micelles as dual templates, porous titania nanotubes with enhanced photocatalytic activity have been successfully synthesized through sol-gel methods. Firstly, P123 micelles were adsorbed onto the surfaces of cellulose nanofibers of filter paper, followed by hydrolysis and condensation of tetrabutyl titanate around these micelles to form titania layer. After calcination to remove the organic templates, hierarchical titania nanotubes with pores in the walls were obtained. The sample was characterized by X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption/desorption, Fourier Transform Infrared Spectroscopy (FT-IR), Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS), and X-ray photoelectron spectroscopy (XPS). As compared with commercial P25 catalyst, the porous titania nanotubes prepared by this method displayed significantly enhanced photocatalytic activity for degrading methyl orange under UV irradiation. Within 10 minutes, the porous titania nanotubes are able to degrade over 70% of the original MO, while the value for the commercial Degussa P25 is only about 33%.

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Wongaree, Mathana, and Adisak Bootwong. "A Performance Study of CNT/TiO₂/ PVA Loaded on the Paper Filter for Benzene Treatment from Cigarette Smoke." Materials Science Forum 990 (May 2020): 312–17. http://dx.doi.org/10.4028/www.scientific.net/msf.990.312.

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This work has studied the performance of benzene treatment from cigarette smoke using the prepared CNT/TiO2/PVA loaded on the paper filter in the air purifier reactor. CNT/TiO2 nanomaterial was prepared from a mixture of carbon nanotubes modified with sulfuric acid and titanium dioxide by a simple mixing method in the ambient temperature. CNT/TiO2 nanomaterial was then loaded on the paper filter by a filtrating technique using 12%w/v polyvinyl alcohol (PVA) as a co-polymer. The weight of CNT/TiO2 loaded on the paper filter was fixed at 3 g. The ratios of CNT: TiO2 was varied at 1:5, 1:10, and 1:15 w/w, respectively. The performance of air purifier using CNT/TiO2/PVA loaded on the paper filter with various ratios was investigated on the photocatalytic activity of benzene treatment from cigarette smoke under visible light. The decreased benzene concentrations were analyzed by GC-FID. As the results, the ratio of CNT/TiO2 loaded on the paper filter at 1:10 showed the highest performance by up to 45%, while the ratio of CNT/TiO2 at 1:15 showed 30% and CNT/TiO2 at 1:5 was the lowest of 22%, respectively. This is because adding the optimum CNT to TiO2 can be improved the adsorption efficiency and the ability to degrade benzene from cigarette smoke. Additionally, CNT also assists in reducing the recombination of TiO2 particles that effect to the high performance on the photocatalytic activity. Therefore, the prepared CNT/TiO2/PVA loaded on the paper filter could be used for the air treatment.

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Hu, Jian, Zhaoxiang Zhong, Feng Zhang, Weihong Xing, Wanqin Jin, and Nanping Xu. "High-efficiency, Synergistic ZnO-Coated SiC Photocatalytic Filter with Antibacterial Properties." Industrial & Engineering Chemistry Research 55, no. 23 (June 3, 2016): 6661–70. http://dx.doi.org/10.1021/acs.iecr.6b00988.

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Ginestet, A., D. Pugnet, J. Rowley, K. Bull, and H. Yeomans. "Development of a new photocatalytic oxidation air filter for aircraft cabin." Indoor Air 15, no. 5 (October 2005): 326–34. http://dx.doi.org/10.1111/j.1600-0668.2005.00369.x.

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Xu, Xi, Shuning Xiao, Habimana Jean Willy, Ting Xiong, Ramadan Borayek, Wei Chen, Dieqing Zhang, and Jun Ding. "3D-Printed Grids with Polymeric Photocatalytic System as Flexible Air Filter." Applied Catalysis B: Environmental 262 (March 2020): 118307. http://dx.doi.org/10.1016/j.apcatb.2019.118307.

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Kim, Tae-Young, Yeong-Tae Cho, and Jae-Yong Kim. "Air Purification of Smoking Booth Using Photocatalytic Process and Air Filter." Applied Chemistry for Engineering 27, no. 4 (August 10, 2016): 433–38. http://dx.doi.org/10.14478/ace.2016.1059.

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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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Amornpitoksuk, Pongsaton, and Sumetha Suwanboon. "Dye Degradation Using Ag/ZnO Illuminated by Fluorescent Lamps." Applied Mechanics and Materials 749 (April 2015): 206–10. http://dx.doi.org/10.4028/www.scientific.net/amm.749.206.

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Heterostructure of Ag/ZnO was synthesized by a reduction of Tollen’s reagent on ZnO powders. The photocatalytic activity of Ag/ZnO was investigated through the degradation of three different dye solutions (methylene blue, rhodamine B and reactive orange 16) under visible light using the fluorescent lamps with a 420 nm longpass filter. The efficiencies of dye degradations for all three dyes by Ag/ZnO are better than that of pure ZnO. Furthermore, the parameters including photocatalyst loadings and initial pHs of dye solutions were also studied. The photocatalytic degradations for all three dyes were increased with the increasing of catalyst loadings. The effect of pHs on photocatalytic activity of Ag/ZnO can be explained by the interaction between the charge on the surface of photocatalyst and the charge of dye ions.

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Xu, Chengwei, Wenxia Xie, Yan Yu, Jun Zhang, and Jiangang Yang. "Photocatalytic and Filtration performance study of TiO2/CNTs-Filter for oil particle." Process Safety and Environmental Protection 123 (March 2019): 72–78. http://dx.doi.org/10.1016/j.psep.2018.12.029.

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32

Slimen, Houda, Tsuyoshi Ochiai, Kazuya Nakata, Taketoshi Murakami, Ammar Houas, Yuko Morito, and Akira Fujishima. "Photocatalytic Decomposition of Cigarette Smoke Using a TiO2-Impregnated Titanium Mesh Filter." Industrial & Engineering Chemistry Research 51, no. 1 (December 21, 2011): 587–90. http://dx.doi.org/10.1021/ie2016762.

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Huang, Donggen, Feng Zhang, Zhibin Tu, Qing Yang, Shuiqing Quan, and Lei Liu. "Degradation of 4-Nitrophenol Using a Coupled Photocatalytic–Biological Aerated Filter Process." Environmental Engineering Science 28, no. 10 (October 2011): 677–85. http://dx.doi.org/10.1089/ees.2010.0039.

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34

Tsoumachidou, Sophia, Dimitra Lambropoulou, and Ioannis Poulios. "Homogeneous photocatalytic oxidation of UV filter para-aminobenzoic acid in aqueous solutions." Environmental Science and Pollution Research 24, no. 2 (August 18, 2016): 1113–21. http://dx.doi.org/10.1007/s11356-016-7434-2.

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35

Limmongkon, Yuparat, Jeff Johns, and Lertchai Charerntanyarak. "Preparation of a TiO2-coated photocatalytic air filter for use with an electrostatic air filter pack for xylene removal." ScienceAsia 39, no. 3 (2013): 284. http://dx.doi.org/10.2306/scienceasia1513-1874.2013.39.284.

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36

Katayama-Hirayama, K., S. Arai, T. Kobayashi, H. Matsuda, Z. Luo, M. Tachibana, H. Kaneko, T. Akitsu, and K. Hirayama. "Removal of bisphenols by slow sand filtration." Water Supply 9, no. 3 (August 1, 2009): 263–68. http://dx.doi.org/10.2166/ws.2009.329.

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A compensating effect in the reduction of bisphenols (BPs) has been shown using biodegradation in slow sand filtration and advanced photocatalysis. We tried to remove 8 kinds of BP by slow sand filtration. Removal rates of BPA, BPB, BPE, BPF, BPS, thiobisphenol (TBP), and dihydroxybenzophenone (DHB) indicated a high removal rate up to more than 90% at an initial concentration of 100 μg/L, whereas the removal rate of BPP was only 30%. We also examined removal of BPs by Pt-loaded porous photocatalyst under visible light irradiation. Removal rates of BPA, BPB, BPE, BPF, BPP, and TBP showed high removal rates up to more than 90% at an initial concentration of 10 mg/L. Removal of BPS and DHB was relatively low at 20% and 30%, respectively. Removal of BPP was low in slow sand filtration, but Pt-loaded photocatalyst removed BPP effectively. Removal of BPS was low with Pt-loaded photocatalyst, but slow sand filtration removed BPS effectively. The combination of a slow sand filter and Pt-loaded photocatalyst may be helpful to degrade BPs. The magnitude of decomposition of BPs by photocatalytic reaction may be related to electrophilic frontier density. But the degradability of BPs in slow sand filtration is not the same as that in photocatalytic reaction with Pt-loaded titanium dioxide. The biodegradability of BPs by slow sand filtration cannot be explained by molecular orbital calculation.

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Li, X. Z., and Y. G. Zhao. "Advanced treatment of dyeing wastewater for reuse." Water Science and Technology 39, no. 10-11 (May 1, 1999): 249–55. http://dx.doi.org/10.2166/wst.1999.0664.

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As one of the main pollution sources in Hong Kong, the textile dyeing and finishing industry creates a significant proportion of water pollution in nearby harbour zones. Generally speaking, conventional biological treatment processes have difficulties in degrading many dye chemicals causing high COD and colour in dyeing wastwaters. Studies using physical and chemical processes to further reduce COD and colour from dyeing wastewater have been intensively reported. The use of a photocatalytic process in the presence of TiO2 to degrade many different types of dye chemicals has been confirmed. However, how to efficiently separate and reuse TiO2 from treated wastewater became a notable problem in the application of a TiO2 photo-oxidation process. This study aims to develop an advanced treatment process for dyeing wastewater treatment. In which dyeing wastewater was initially treated by an Intermittently Decanted Extended Aeration (IDEA) reactor to initially remove those biodegradable matters and further treated by a TiO2 photocatalytic reactor as advanced treatment for complete decolorization and high COD removal. Suspended TiO2 powder used in photooxidation was separated from slurry by a membrane filter and recycled to the photoreactor continuously. The results demonstrated that photocatalytic-oxidation process could degrade those non-biodegradable organic substances in the effluent treated by the biological treatment process and also remove the colour from the effluent completely. TiO2, as catalyst, was successfully recovered by a membrane filter and continuously reused in the photoreactor. The quality of dyeing wastewater treated by the advanced treatment process can be good enough for reuse in the textile dyeing processes.

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Ochiai, Tsuyoshi, Kazuya Nakata, Taketoshi Murakami, Takuji Horie, Yuko Morito, and Akira Fujishima. "Anodizing Effects of Titanium-Mesh Surface for Fabrication of Photocatalytic Air Purification Filter." Nanoscience and Nanotechnology Letters 4, no. 5 (May 1, 2012): 544–47. http://dx.doi.org/10.1166/nnl.2012.1344.

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39

Ramasundaram, Subramaniyan, Ha Na Yoo, Kyung Guen Song, Jaesang Lee, Kyoung Jin Choi, and Seok Won Hong. "Titanium dioxide nanofibers integrated stainless steel filter for photocatalytic degradation of pharmaceutical compounds." Journal of Hazardous Materials 258-259 (August 2013): 124–32. http://dx.doi.org/10.1016/j.jhazmat.2013.04.047.

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40

Xu, Chengwei, Wenxia Xie, Xiaodong Si, Jun Zhang, and Jiangang Yang. "Photocatalytic degradation of cooking fume on a TiO2-coated carbon nanotubes composite filter." Environmental Research 166 (October 2018): 167–74. http://dx.doi.org/10.1016/j.envres.2018.05.038.

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41

Wongwatcharapaiboon, Jitiporn, Guohui Gan, and Saffa B. Riffat. "A new air PM2.5 filtrative lamp with a combination of fabric filter and TiO2 coating mop." International Journal of Low-Carbon Technologies 14, no. 3 (May 13, 2019): 394–99. http://dx.doi.org/10.1093/ijlct/ctz027.

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Abstract Air particle cleaning in developing countries in Southeast Asia has become important especially regarding local respiratory health. One of possible solutions is air filtration which is normally used but at high cost. Therefore, this study aims to develop low cost air PM2.5 filtration using integrated lamp, and then investigate filtration performance of adaptive lamp. The integration of fabric filter and floor lamp is designed with fan unit driving force, and then photocatalytic process is applied for increasing air purificative performance. Tests are set in 2.5 m width × 2.5 m length × 2.5 m height bedroom within three regimes: (A) existing filter, (B) integrating fabric filter lamp and (C) adapting TiO2 fiber mop to filter lamp. Based on EPA standard, no regime examined exceeds NAAQs at 35 μg/m3, while regime C with fan speed 2 m/s shows the best performance of air purification. Then the MERV level of filtrative lamp demonstrates MERV15 and MERV16 to identify regime B lamp with 3 m/s fan speed and C lamp with 2 m/s fan speed respectively.

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42

Wang, Zhao, Anjan Deb, Varsha Srivastava, Sidra Iftekhar, Indu Ambat, and Mika Sillanpää. "Investigation of textural properties and photocatalytic activity of PbO/TiO2 and Sb2O3/TiO2 towards the photocatalytic degradation Benzophenone-3 UV filter." Separation and Purification Technology 228 (December 2019): 115763. http://dx.doi.org/10.1016/j.seppur.2019.115763.

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43

T. S. Wiltowski, R. D. Howerton, S. "Photocatalytic Oxidation of Trichloroethylene and Carbon Tetrachloride Using Titanium Dioxide Filter as a Catalyst." Energy Sources 23, no. 9 (October 2001): 845–52. http://dx.doi.org/10.1080/009083101316931915.

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44

Brancher, Marlon, Davide Franco, and Henrique de Melo Lisboa. "Photocatalytic oxidation of H2S in the gas phase over TiO2-coated glass fiber filter." Environmental Technology 37, no. 22 (April 15, 2016): 2852–64. http://dx.doi.org/10.1080/09593330.2016.1167250.

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45

Yu, Kuo-Pin, Grace Whei-May Lee, Szu-Ying Lin, and Chien Ping Huang. "Removal of bioaerosols by the combination of a photocatalytic filter and negative air ions." Journal of Aerosol Science 39, no. 5 (May 2008): 377–92. http://dx.doi.org/10.1016/j.jaerosci.2007.12.005.

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46

Liu, Huang, Yanhua Zhang, Hongtao Yang, Wei Xiao, and Lanlan Sun. "Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange." Journal of Chemistry 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2862567.

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Nanometer-sized zinc oxide (ZnO) has been synthesized through sol-gel method with natural cellulose substance (commercial filter paper) as template. The structure of zinc oxide nanomaterial was characterized by nitrogen adsorption-desorption and XRD. The morphology was observed by SEM and TEM. The results show that the hexagonal wurtzite phase is actually the only crystal phase in the sample and the product faithfully inherits the hierarchical morphology and the complex network structure of the original filter paper, which is composed of many randomly intersecting zinc oxide microfibers and nanosheets with lots of close stacked particles adsorbed on the surface. Moreover, these zinc oxide nanomaterials possess abundant mesoporous structure with an average pore diameter ofca. 21 nm and a wide pore size distribution (3–30 nm). Due to the strong absorption ability in the UV range, the zinc oxide nanomaterial prepared by this method displays significantly high photocatalytic activity for degrading methyl orange. In a short period of 20 minutes, the zinc oxide nanomaterial has degraded about 50% of the original MO, and the MO dye is fully degraded after UV irradiation for 80 minutes.

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47

Battistin, Mattia, Valeria Dissette, Alessandro Bonetto, Elisa Durini, Stefano Manfredini, Antonio Marcomini, Elisa Casagrande, et al. "A New Approach to UV Protection by Direct Surface Functionalization of TiO2 with the Antioxidant Polyphenol Dihydroxyphenyl Benzimidazole Carboxylic Acid." Nanomaterials 10, no. 2 (January 28, 2020): 231. http://dx.doi.org/10.3390/nano10020231.

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Skin cancer is the most common malignant cancer with an incidence of 1 million cases/year. It is well known that exposure to UV radiation from sunlight leads the most frequent risk factors for several skin disorders including skin cancer. Sunscreen filters represent a valid protection against dangerous effects derived from UV radiation, and they can be divided in organic and inorganic UV filters. Adding, at the product formulation, molecules with booster effect, or also substances that can increase the protecting effectiveness via synergic mechanisms, can further enhance their protection activity. Moreover, this approach leads to develop formulations with high SPF (Sun Protection Factor) with a reduced content of UV filters, this is in line with the recent decisions of yet a few countries (Palau, Thailand, Philippines, and Hawaii) to ban some sunscreen filters to preserve marine environments (i.e., reef). In this work, a new class of sunscreen UV filters has been synthesized, by means the combination of physical filter and Oxisol, an antioxidant molecule with booster effect. In this study, the synthesis of new physical multifunctional ingredients is reported, by means the direct surface functionalization of inorganic filters (in particular TiO2) with Oxisol. In this study, the full characterization of these multifunctional ingredients is also reported, in addition to the cytotoxicity tests, the photocatalytic activity and the rheological properties involved on skin application.

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48

Kwon, Miyeon, Juhea Kim, and Juran Kim. "Photocatalytic Activity and Filtration Performance of Hybrid TiO2-Cellulose Acetate Nanofibers for Air Filter Applications." Polymers 13, no. 8 (April 19, 2021): 1331. http://dx.doi.org/10.3390/polym13081331.

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A facile method to prepare hybrid cellulose acetate nanofibers containing TiO2 (TiO2-CA nanofibers) by emulsion electrospinning technique was developed for the denitrification and filtration of particulate matters (PMs). This work found that hybrid TiO2-CA nanofibers mainly contain the anatase form of TiO2, contributing to the photodecomposition of NO gas under UV irradiation. The TiO2-CA nanofibers also showed an excellent filtration efficiency of 99.5% for PM0.5 and a photocatalytic efficiency of 78.6% for NO removal. Furthermore, the results implied that the morphology of the TiO2-CA nanofibers, such as micro-wrinkles and protrusions, increased the surface hydrophobicity up to 140°, with the increased addition of TiO2 nanoparticles. The proposed TiO2-CA nanofibers, as a result, would be promising materials for highly efficient and sustainable air filters for industrial and home appliance systems.

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Morlando, Alexander, Dean Cardillo, Thierry Devers, and Konstantin Konstantinov. "Titanium doped tin dioxide as potential UV filter with low photocatalytic activity for sunscreen products." Materials Letters 171 (May 2016): 289–92. http://dx.doi.org/10.1016/j.matlet.2016.02.094.

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Bogusz, Kathrin, Dean Cardillo, Moeava Tehei, Tifenn Boutard, Philip J. Barker, Thierry Devers, Anatoly Rosenfeld, Shi X. Dou, Hua K. Liu, and Konstantin Konstantinov. "Biocompatible Bi(OH)3 nanoparticles with reduced photocatalytic activity as possible ultraviolet filter in sunscreens." Materials Research Bulletin 108 (December 2018): 130–41. http://dx.doi.org/10.1016/j.materresbull.2018.08.041.

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