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Academic literature on the topic 'Photocatalytic nanocomposites'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Photocatalytic nanocomposites"

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Gerawork, Mekdes. "Remediation of textile industry organic dye waste by photocatalysis using eggshell impregnated ZnO/CuO nanocomposite." Water Science and Technology 83, no. 11 (2021): 2753–61. http://dx.doi.org/10.2166/wst.2021.165.

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Abstract Heterogeneous photocatalysis using nanocomposites is of great research interest in the treatment of industrial wastewater. The impregnated photocatalyst was produced by liquid state reaction of ZnO/CuO nanocomposite with extracted eggshells. The structure, functional group, metal composition, bandgap, and photocatalytic activity of the nanocomposites were characterized by using X-ray diffraction, Fourier-transform infrared spectroscopy, atomic absorption spectrometry, and UV–Vis spectroscopy, respectively, in the absence and presence of eggshells. Photocatalytic degradation activities of the nanocomposites under UV light irradiation have been tested for a real sewage sample taken from Debre Berhan Textile Industry. From the results, the optimized degradation efficiency of the dye was 97.95% with 0.4 g dose of the photocatalyst, 120 min irradiation time, 120 °C temperature, and pH of 6.7. The results revealed that eggshell impregnated nanocomposite had better catalytic activity than the naked nanocomposite. This is due to the highly porous structure of eggshell biomasses and their sorption characteristics. In conclusion, when nanocomposites are supported by eggshell biomasses, they are excellent photocatalysts and can minimize the contamination of organic dyes from textile effluents.

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Che Ramli, Zatil Amali, Wan Nor Roslam Wan Isahak, Mohd Ambar Yarmo, and Nilofar Asim. "Investigation of Photocatalytic Activity of TiO₂-PANi Nanocomposites." Applied Mechanics and Materials 699 (November 2014): 53–58. http://dx.doi.org/10.4028/www.scientific.net/amm.699.53.

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In this paper the photocatalytic activity of TiO2-PANi nanocomposites prepared using two differentIn-situpolymerization methods have been investigated. The same pressure, temperature, precursors, mole ratio, and solvent have been employed for preparation of nanocomposites. The synthesized nanocomposites were characterized by FESEM, XRD and FTIR. Results revealed the successful preparation of TiO2- PANI nanocomposites. TiO2-PANi nanocomposite synthesized using method 2 showed very well dispersed TiO2nanoparticles on the surface of PANi. There is no agglomeration of TiO2nanoparticles in PANi matrix. The photocatalytic activities of nanocomposites were evaluated by using photo degradation of Methylene Blue (MB) in aqueous solution under UV irradiation. These nanocomposites exhibit much higher photocatalytic activity compared with TiO2.

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Shih, Kun-Yauh, Yen-Ling Kuan, and En-Rui Wang. "One-Step Microwave-Assisted Synthesis and Visible-Light Photocatalytic Activity Enhancement of BiOBr/RGO Nanocomposites for Degradation of Methylene Blue." Materials 14, no. 16 (2021): 4577. http://dx.doi.org/10.3390/ma14164577.

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In this study, bismuth oxybromide/reduced graphene oxide (BiOBr/RGO), i.e. BiOBr-G nanocomposites, were synthesized using a one-step microwave-assisted method. The structure of the synthesized nanocomposites was characterized using Raman spectroscopy, X-ray diffractometry (XRD), photoluminescence (PL) emission spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), and ultraviolet-visible diffuse reflection spectroscopy (DRS). In addition, the ability of the nanocomposite to degrade methylene blue (MB) under visible light irradiation was investigated. The synthesized nanocomposite achieved an MB degradation rate of above 96% within 75 min of continuous visible light irradiation. In addition, the synthesized BiOBr-G nanocomposite exhibited significantly enhanced photocatalytic activity for the degradation of MB. Furthermore, the results revealed that the separation of the photogenerated electron–hole pairs in the BiOBr-G nanocomposite enhanced the ability of the nanocomposite to absorb visible light, thus improving the photocatalytic properties of the nanocomposites. Lastly, the MB photo-degradation mechanism of BiOBr-G was investigated, and the results revealed that the BiOBr-G nanocomposites exhibited good photocatalytic activity.

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Kuriakose, Sini, D. K. Avasthi, and Satyabrata Mohapatra. "Effects of swift heavy ion irradiation on structural, optical and photocatalytic properties of ZnO–CuO nanocomposites prepared by carbothermal evaporation method." Beilstein Journal of Nanotechnology 6 (April 10, 2015): 928–37. http://dx.doi.org/10.3762/bjnano.6.96.

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ZnO–CuO nanocomposite thin films were prepared by carbothermal evaporation of ZnO and Cu, combined with annealing. The effects of 90 MeV Ni7+ ion irradiation on the structural and optical properties of ZnO–CuO nanocomposites were studied by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV–visible absorption spectroscopy and Raman spectroscopy. XRD studies showed the presence of ZnO and CuO nanostructures in the nanocomposites. FESEM images revealed the presence of nanosheets and nanorods in the nanocomposites. The photocatalytic activity of ZnO–CuO nanocomposites was evaluated on the basis of degradation of methylene blue (MB) and methyl orange (MO) dyes under sun light irradiation and it was observed that swift heavy ion irradiation results in significant enhancement in the photocatalytic efficiency of ZnO–CuO nanocomposites towards degradation of MB and MO dyes. The possible mechanism for the enhanced photocatalytic activity of ZnO–CuO nanocomposites is proposed. We attribute the observed enhanced photocatalytic activity of ZnO–CuO nanocomposites to the combined effects of improved sun light utilization and suppression of the recombination of photogenerated charge carriers in ZnO–CuO nanocomposites.

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Khiari, Mouna, Mickaël Gilliot, Michaël Lejeune, Florica Lazar, and Aomar Hadjadj. "Effects of Ag Nanoparticles on Zinc Oxide Photocatalytic Performance." Coatings 11, no. 4 (2021): 400. http://dx.doi.org/10.3390/coatings11040400.

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We used a sol–gel spin coating technique to synthesize nanocomposite thin films based on zinc oxide (ZnO) loaded with silver nanoparticles (NPs). We tested these ZnO/Ag NPs photocatalysts, with a thickness of about 100 nm, for the photodegradation of the indigo carmine dye solution. The study focused on the effects of Ag NPs on the ZnO matrix as well as the impact of their concentration on the photocatalytic performance of the nanocomposite. The study also highlighted the high stability of the photocatalytic performance of these nanocomposites. This work is a contribution in the search for non-toxic thin film photocatalysts that is usable under solar radiation for the treatment of contaminated wastewater. Innovation in the field of heterogeneous photocatalysis requires the use of solar resource with efficient results in terms of photocatalytic performance.

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Du, Yuanyuan, Xinjun Li, Ying Fu, et al. "Study on Photocatalytic Degradation of Pollutants by Zinc Oxide Nanocomposites." E3S Web of Conferences 290 (2021): 03017. http://dx.doi.org/10.1051/e3sconf/202129003017.

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In recent years, the research of zinc oxide nanocomposites has attracted much attention. Due to the high probability of photonized carrier recombination of a single nanometer zinc oxide material, and the low utilization of sunlight, its application in the degradation of pollutants is limited. Compounding zinc oxide with other materials can solve this problem. In this paper, through the study of the photocatalytic properties of zinc oxide nanocomposites, the synthesis methods and photocatalytic properties of TiO2/ZnO and ZnO/graphene nanocomposites are reviewed. Nanocomposite photocatalytic degradation mechanism of pollutants and its application in the degradation of pollutants.

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Johar, Muhammad Ali, Rana Arslan Afzal, Abdulrahman Ali Alazba, and Umair Manzoor. "Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites." Advances in Materials Science and Engineering 2015 (2015): 1–22. http://dx.doi.org/10.1155/2015/934587.

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Nanocomposites have a great potential to work as efficient, multifunctional materials for energy conversion and photoelectrochemical reactions. Nanocomposites may reveal more improved photocatalysis by implying the improvements of their electronic and structural properties than pure photocatalyst. This paper presents the recent work carried out on photoelectrochemical reactions using the composite materials of ZnO with CdS, ZnO with SnO2, ZnO with TiO2, ZnO with Ag2S, and ZnO with graphene and graphene oxide. The photocatalytic efficiency mainly depends upon the light harvesting span of a material, lifetime of photogenerated electron-hole pair, and reactive sites available in the photocatalyst. We reviewed the UV-Vis absorption spectrum of nanocomposite and photodegradation reported by the same material and how photodegradation depends upon the factors described above. Finally the improvement in the absorption band edge of nanocomposite material is discussed.

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Xu, Hui, and Jian Wei Xing. "Preparation of ZnO/PANI Nanocomposite and Study on its Photocatalytic Properties." Advanced Materials Research 716 (July 2013): 368–72. http://dx.doi.org/10.4028/www.scientific.net/amr.716.368.

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Polyaniline (PANI)/zinc oxide (ZnO) nanocomposites have been synthesized by in-situ polymerization of aniline monomer with ZnO nanomaterials. The PANI/ZnO nanocomposites were used as photocatalyst in the photodegradation of methylene blue dye (MB) molecules in aqueous solution. The results showed that PANI/ZnO nanocomposite greatly enhanced photocatalytic activities compared with pristine polyaniline might due to high photoexcited electronhole pairs charge separation. The photocatalytic activities of PANI/ZnO nanocomposites increased with increasing ZnO content, however, further increasing ZnO content over 50% induced the formation of more agglomerates, which could act as recombination centers of photoexcited electronhole pairs, leading to decreased photocatalytic activity. The kinetics of photodegradation of MB dye using PANI/ZnO(ZnO content 50 % ) nanocomposites photocatalyst was found to be of the first order.

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Al-Khthami, Nada D., Mohammed Alsawat, Reda M. Mohamed, Yousef G. Alghamdi, and Zaki I. Zaki. "Extremely Effective Visible Light-Driven Generation of Hydrogen by Sol–Gel LaFeO3-Decorated g-C3N4 Photocatalyst." Nanoscience and Nanotechnology Letters 12, no. 11 (2020): 1255–64. http://dx.doi.org/10.1166/nnl.2020.3241.

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In order to create a new design for an efficient photocatalyst, you need to decrease the obtained band gap and isolate the charge carriers photogenerated while setting up a new visible light methodology. The latter option could be accomplished via combination of catalyst in the metal oxide form over the surface of semiconductor. Hence, the current work aimed at synthesizing a new nanocomposite material from LaFeO3/g-C3N4 through the use of mesoporous silica as a template processing g-C3N4 higher surface area, which was subsequently decorated with LaFeO3. The LaFeO3 of variable content of 1∼4% was used to decorate our targeted basic material. The structure was confirmed by ordinary techniques, in addition to photocatalytic ability via splitting water reaction. g-C3N4 and LaFeO3 photocatalytic efficiencies were compared to the newly developed LaFeO3/g-C3N4 nanocomposites showing their outstanding activity. The optimum LaFeO3 content was confirmed as 3%, which gave higher photocatalytic efficiency against both g-C3N4 and LaFeO3 (34 and 21 times respectively). To enhance the catalytic system efficiency, a scavenger with a positive hole was added as glycerol. A maximum of five runs of higher efficient reuse was examined as required, as well as stable nanocomposite photocatalyst. The mesoporous structure, high surface area, and capacity of charge separation over the photocatalysis process were all investigated as main conditions which affect photocatalytic activity of LaFeO3/g-C3N4 nanocomposites.

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Fajriati, Imelda, Mudasir Mudasir, and Endang Tri Wahyuni. "Photocatalytic Decolorization Study of Methyl Orange by TiO₂–Chitosan Nanocomposites." Indonesian Journal of Chemistry 14, no. 3 (2014): 209–18. http://dx.doi.org/10.22146/ijc.21230.

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The photocatalytic decolorization of methyl orange (MO) by TiO2-chitosan nanocomposite has been studied. This study was started by synthesizing TiO2-chitosan nanocomposites using sol-gel method with various concentrations of Titanium(IV) isopropoxide (TTIP) as the TiO2 precursor. The structure, surface morphology, thermal and optical property of TiO2-chitosan nanocomposite were characterized by X-ray diffraction (XRD), fourier transform infra red (FTIR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and diffuse reflectance ultra violet (DRUV) spectroscopy. The photocatalytic activity of TiO2-chitosan nanocomposite was evaluated by photocatalytic decolorization of methyl orange as a model pollutant. The results indicate that the particle size of TiO2 increases with increasing ofthe concentration of TTIP, in which TiO2 with smallest particle size exhibit the highest photocatalytic activity. The highest photocatalytic decolorization was obtained at 5 h of contact time, initial concentration of MO at 20 ppm and at solution pH of 4. Using these conditions, over 90% of MO was able to be decolorized using 0.02 g of TiO2-chitosan nanocomposite under UV light irradiation. The TiO2-chitosan nanocomposite could be reused, which meant that the TiO2-chitosan nanocomposites can be developed as an effective and economical photocatalyst to decolorize or treat dye in wastewater.

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Dissertations / Theses on the topic "Photocatalytic nanocomposites"

1

Lee, Sung-Hwan. "Photocatalytic nanocomposites based on TiO₂ and carbon nanotubes." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008343.

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Pradhan, Anindya. "Synthesis and Characterization of Novel Nanoparticles for Use as Photocatalytic Probes and Radiotracers." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/689.

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Two novel synthetic routes to formation of gold-magnetite nanoparticles have been designed. Treatment of preformed magnetite nanoparticles with ultrasound in aqueous media with dissolved tetrachloroauric acid resulted in the formation of gold-magnetite nanocomposite materials. The other route involved irradiation of preformed magnetite nanoparticles by UV light in aqueous media with dissolved tetrachloroauric acid. This method resulted in the formation of gold-magnetite nanocomposite materials. These materials maintained the morphology of the original magnetite particles. The morphology of the gold particles could be controlled by adjusting experimental parameters, like addition of small amounts of solvent modifiers such as methanol, diethylene glycol, and oleic acid as well as variation of the concentration of the tetrachloroauric acid solution and time of the reaction. The nanocomposite materials were magnetic and exhibited optical properties similar to gold nanoparticles. Since we were not able to directly synthesize core shell gold magnetite nanoparticles, TiO2 was used as a bridging material. TiO2 nanoparticles with embedded magnetite were suspended in aqueous HAuCl4 and irradiated with ultraviolet light to photodeposit gold. The degree of gold coating and the wavelength of absorbance could be controlled by adjusting concentration of HAuCl4. Absorbance maxima were between 540-590 nm. Particles exhibited superparamagnetic properties (blocking temperature ~170 K) whether or not coated with gold. These particles have potential applications as drug delivery agents, magnetic imaging contrast agents, and magnetically separatable photocatalysts with unique surface properties. Another goal was to synthesize and characterize indium doped magnetite nanoparticles for application as radiotracers for in vivo fate studies. The labeled particles will be useful for determination of pharmacological behavior in biological systems. Indium doped magnetite particles with varying size and surface chemistry were synthesized with wet chemical techniques. The synthesized nanoparticles were characterized in terms of the size and shape with the help of TEM, the elemental composition by ICP and EDS, the crystal structure by XRD and magnetic properties by SQUID measurements. It was found that the indium loading could be controlled even though the magnetic properties were similar to undoped magnetite.

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Ocwelwang, Atsile Rosy. "Photocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre support." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1006794.

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Lack of potable water is one of the major challenges that the world faces currently and the effects of this are mainly experienced by people in developing countries. This has therefore propelled research in advanced oxidation technologies AOTs to improve the current water treatment methods using cost effective, non toxic and efficient treatment methods. Hence, in this study the sol-gel synthesis method was used to prepare TiO2 nanoparticles that were photocatalytically active under UV and visible solar light as well as possessing antibacterial properties. Silver and nitrogen doping was carried out to extend the optical absorption of TiO2. For easy removal and reuse of the photocatalyst the nanoparticles were immobilized on chitosan and poly (vinyl-alcohol-co-ethylene) using the electrospining technique. The synthesized nanomaterials were characterized by FTIR, XRD, SEM/EDS, TEM, DRS, and TGA. FTIR and EDS analysis confirmed the formation and composition of TiO2 nanopowders for the doped and undoped nanoparticles. XRD analysis showed that the anatase phase was the dominant crystalline phase of the synthesized nanopowders. SEM and TEM respectively illustrated the distribution and size of the electrospun nanofibers and the nanoparticles of TiO2. DRS results showed that there was a significant shift in the absorption band edge and wavelength of Ag-TiO2 to 397 nm, followed by N-TiO2 at 396 nm compared to the commercial titania which was at 359 nm. The photocatalytic activities and antibacterial properties of these materials were tested on methylene blue dye and E.coli microorganism respectively. Ag-TiO2 immobilized on nanofibers of chitosan and PVAE had the highest photocatalytic activity compared to N-TiO2. Similar results were observed when the biocide properties of these materials were tested on E. coli.

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Alam, Tanvir E. "Metal Oxide Graphene Nanocomposites for Organic and Heavy Metal Remediation." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3945.

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This thesis consists of two research problems in the water decontamination area. In the first work, the main focus is to understand the structure and photocatalytic activity of titanium dioxide with graphene (G-TiO2) which is synthesized by using sol-gel method. The photocatalytic activity of TiO2 is limited by the short electron hole pair recombination time. Graphene, with high specific surface area and unique electronic properties, can be used as a good support for TiO2 to enhance the photocatalytic activity. The obtained G-TiO2 photocatalysts has been characterized by X-Ray Diffraction (XRD), Raman Spectroscopy, Transmission Electron Microscopy (TEM), FTIR Spectroscopy and Ultraviolet visible (UV-vis) Spectroscopy. This prepared G-TiO2 nanocomposite exhibited excellent photocatalysis degradation on methyl orange (MO) under irradiation of simulated sunlight. Such enthralling photocatalyst may find substantial applications in various fields. The primary objective of the second work is to understand the nanocomposite structure of SiO2 coated over graphene (G) nanoplatelets. An attempt has been made to synthesize G-SiO2 nanocomposite using sol-gel technique. The G-SiO2 nanocomposite is characterized using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Raman spectroscopy, FTIR spectroscopy, and Electrochemical and Electrical measurement technique, respectively. In this work, G-SiO2 nanoparticles with the water containing salts of zinc is added, and allowed to settle in water. The ZnCl2 ix concentration displays a whitish color solution which has turned to colorless within one or two hours of treatment with G-SiO2 nanocomposites. The presence of heavy metal is tested using electrochemical cyclic voltammetry (CV) technique. The CV measurement on the water treated with G-SiO2 has been tested for several days to understand the presence of heavy metals in water. Interestingly, the near complete separation has been observed by treating the heavy metal contaminated water sample for one to two days in presence of G-SiO2 nanoparticles. The redox potential observed for the heavy metal has been found to diminish as a function of treatment with respect to time, and no redox peak is observed after the treatment for four to five days. Further test using EDS measurement indicates that the heavy metal ions are observed within the G-SiO2 nanocomposite. The recovery of G-SiO2 nanocomposite is obtained by washing using deionized water. Our experimental finding indicates that the G-SiO2 nanocomposite could be exploited for potential heavy metals cleaning from waste or drinking water.

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Wade, Jeremy. "An Investigation of TiO₂-ZnFe₂O₄ Nanocomposites for Visible Light Photocatalysis." Scholar Commons, 2005. https://scholarcommons.usf.edu/etd/898.

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Environmental pollution on a global scale is expected to be the greatest problem that chemical scientists will face in the 21st century, and an increasing number of these scientists are looking to new photocatalytic systems for the solution. Existing photocatalytic systems are effective for the decomposition of many unwanted organics through the use of efficient semiconductor photocatalysts activated by ultra-violet (UV) irradiation. The demand for visible light activated photocatalytic systems is increasing rapidly. Currently, however, the efficiency and availability of photocatalysts which can be activated effectively by the solar spectrum and especially indoor lighting is severely limited. The purpose of this project is to investigate the potential of a TiO2-ZnFe2O4 alloyed nanocomposite for use as a visible light activated photocatalyst. An overview of the principles of photocatalysis is first provided. Relevant properties of pure and modified TiO2 are next discussed, and results of studies on structural and photocatalytic properties are presented. Alloyed TiO2-ZnFe2O4 nanocomposites are discussed in detail and their crystal structure, particle size, particle interaction, optical characteristics, and photoactivity are discussed in detail. Measurements characterizing the alloys are carried out using XRD, SEM, EDS, UV-Vis spectroscopy, and photodegradation procedures. The photoactivity of the alloys is carefully studied through phenol degradation experiments, and recommendations are provided to improve the photocatalysts under investigation.

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Davis-Wheeler, Chin Clare. "Platinum@Hexaniobate Nanopeapods: Sensitized Composite Architectures for Photocatalytic Hydrogen Evolution Under Visible Light Irradiation." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2503.

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Hydrogen fuel is one of the most important areas of research in the field of renewable energy development and production. Hydrogen gas can be generated by fuel cells, water electrolyzers, and heterogeneous nanoscale catalysts. It can be burned to directly release chemical energy or condensed for storage and transport, providing fuel for combustion devices or storing excess energy generated by renewable sources such as wind turbines and concentrated solar power assemblies. While platinum is the most active catalyst for hydrogen reduction, its high cost significantly deters its utilization in advanced photocatalytic materials. One approach to mitigating this expense is optimizing the morphology and placement of nanostructured platinum catalysts. Highly crystalline, morphologically-controlled platinum nanoparticles (Pt NPs) have been effectively utilized to increase hydrogen generation efficiency in a variety of nanocomposite materials. However, synthesis routes to high-quality Pt NPs can be dangerous and difficult to replicate. Furthermore, utilization of the Pt NPs in nanocomposite materials is hindered by lack of control over catalyst placement. Nanopeapods are versatile nanocomposites that offer a high degree of control over catalyst placement as well as the potential for interesting new properties arising from the interaction between the catalyst and a semiconductor. Platinum@hexaniobate nanopeapods (Pt@HNB NPPs) consist of linear arrays of Pt NPs encapsulated within the scrolled semiconductor hexaniobate. Pt@HNB NPPs offer significant advantages over similar composites by utilizing the isolated reduction environment of the encapsulated Pt NP arrays to decrease kinetic competition and surface crowding. This work describes the design, fabrication, and implementation of the new nanocomposite platinum@hexaniobate nanopeapods for sensitized hydrogen production under visible light irradiation. The following chapters present facile microwave heating syntheses of highly crystalline Pt nanocubes and Pt@HNB NPPs with consistent morphology and high catalyst loading. A detailed study is also presented of the optical properties of the Pt nanocubes, which produced a UV-range absorbance band that indicates the formation of a localized surface plasmon resonance. Most significantly, preliminary results from visible light photolysis indicate that sensitized Pt@HNB NPPs produce hydrogen in quantities comparable to published systems, and that alteration of experimental parameters may result in even greater yields.

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Zhang, Ziyang. "Facile Synthesis of ZnWO4/Bi2WO6, FeWO4/Bi2WO6, and TiO2/Bi2WO6 Nanocomposites via a Modified Pechini Sol-gel Method and their Photocatalytic Performance for Bisphenol A Degradation." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613753216804191.

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Sass, Danielle. "Nano silver-Iron-reduced graphene oxide modified titanium dioxide photocatalyst for the remediation of Organic dye in water systems." University of the Western Cape, 2018. http://hdl.handle.net/11394/6274.

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Magister Scientiae - MSc (Chemistry)<br>Drinking water with high concentrations of inorganic and organic contaminants can cause adverse health defects. Specifically methyl orange dye is an organic water contaminant that has been known (along with others like methyl blue etc.) to have an increase in our water systems over the past few years due to increasing demand in industrial processes. It is therefore of utmost importance to remediate organic contaminants and ultimately enable prevention. The contaminants can be removed by photocatalysis. Anatase TiO2 is known for its photocatalytic degradation of environmental pollutants and photoelectro-chemical conversion of solar energy. However its application is limited since it is a wide band gap semiconductor, (Eg = 3.2 eV). The following study deals with the enhancement of the photocatalytic properties of TiO2 for remediation of organic water contaminants. The study was carried out to produce the two nanocomposites AgFe-TiO2 and AgFe-TiO2-rGO photocatalyst which purpose is to be cheap and easy to apply, with improved (fast and effective) photocatalytic degradation of methyl orange. The main objective was to decrease the band gap and to introduce intra-band gap states to absorb visible light. Modification of the TiO2 with small bandgap semiconductor, graphene and Ag- Fe nanoalloy reduced the bandgap energy for visible light absorption and photocatalytic degradation of methyl orange dye. The two composites were synthesised using sonication and chemical synthesis methods. A photocatalytic study (degradation of methyl orange dye) was carried out using a system incorporating an UV lamp source to determine the degradation of methyl orange catalysed by the synthesised photocatalysts AgFe-TiO2-rGO and AgFe-TiO2 along with UV-vis Spectroscopy. Morphological studies were carried out using HRSEM and HRTEM which determined the spherical agglomerated nature of AgFe-TiO2 and the sheet-like nature of AgFe-TiO2-rGO containing spherical agglomerants but that also contained pockets formed by the sheets of the rGO. XRD served as confirmation of the phase of TiO2 in both composites to be anatase. Analysis confirmed the formation and elemental determination of both composites. It was observed that the Band gap of TiO2 degussa decreased from 2.94 eV to 2.77 eV in the composite AgFe-TiO2. The photocatalytic reactivity of AgFe- TiO2 was an improvement from TiO2 and AgFe-TiO2-rGO based on the photocatalytic study. Therefore concluding that AgFe-TiO2 was the best catalyst to convert the dye (Orange II) into free radicals and ultimately remove the contaminant from the water compared to AgFe-TiO2-rGO.

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Chalangar, Ebrahim. "Graphene-based nanocomposites for electronics and photocatalysis." Licentiate thesis, Linköpings universitet, Fysik, elektroteknik och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157095.

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The development of future electronics depends on the availability of suitable functional materials. Printed electronics, for example, relies on access to highly conductive, inexpensive and printable materials, while strong light absorption and low carrier recombination rates are demanded in photocatalysis industry. Despite all efforts to develop new materials, it still remains a challenge to have all the desirable aspects in a single material. One possible route towards novel functional materials, with improved and unprecedented physical properties, is to form composites of different selected materials. In this work, we report on hydrothermal growth and characterization of graphene/zinc oxide (GR/ZnO) nanocomposites, suited for electronics and photocatalysis application. For conductive purposes, highly Al-doped ZnO nanorods grown on graphene nanoplates (GNPs) prevent the GNPs from agglomerating and promote conductive paths between the GNPs. The effect of the ZnO nanorod morphology and GR dispersity on the nanocomposite conductivity and GR/ZnO nanorod bonding strength were investigated by conductivity measurements and optical spectroscopy. The inspected samples show that growth in high pH solutions promotes a better graphene dispersity, higher doping and enhanced bonding between the GNPs and the ZnO nanorods. Growth in low pH solutions yield samples characterized by a higher conductivity and a reduced number of surface defects. In addition, different GR/ZnO nanocomposites, decorated with plasmonic silver iodide (AgI) nanoparticles, were synthesized and analyzed for solar-driven photocatalysis. The addition of Ag/AgI generates a strong surface plasmon resonance effect involving metallic Ag0, which redshifts the optical absorption maximum into the visible light region enhancing the photocatalytic performance under solar irradiation. A wide range of characterization techniques including, electron microscopy, photoelectron spectroscopy and x-ray diffraction confirm a successful formation of photocatalysts. Our findings show that the novel proposed GR-based nanocomposites can lead to further development of efficient photocatalyst materials with applications in removal of organic pollutants, or for fabrication of large volumes of inexpensive porous conjugated GR-semiconductor composites.

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Sass, Danielle Thandi. "Nano silver-iron-reduced graphene oxide modified titanium dioxide photocatalyst for the remediation of organic dye in water systems." University of the Western Cape, 2018. http://hdl.handle.net/11394/6410.

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Magister Scientiae - MSc (Chemistry)<br>Drinking water with high concentrations of inorganic and organic contaminants can cause adverse health defects. Specifically methyl orange dye is an organic water contaminant that has been known (along with others like methyl blue etc.) to have an increase in our water systems over the past few years due to increasing demand in industrial processes. It is therefore of utmost importance to remediate organic contaminants and ultimately enable prevention. The contaminants can be removed by photocatalysis. Anatase TiO2 is known for its photocatalytic degradation of environmental pollutants and photoelectro-chemical conversion of solar energy. However its application is limited since it is a wide band gap semiconductor, (Eg = 3.2 eV). The following study deals with the enhancement of the photocatalytic properties of TiO2 for remediation of organic water contaminants.<br>2021-12-31

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Books on the topic "Photocatalytic nanocomposites"

1

Khan, Mohammad Mansoob, Debabrata Pradhan, and Youngku Sohn, eds. Nanocomposites for Visible Light-induced Photocatalysis. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62446-4.

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Pradhan, Debabrata, Mohammad Mansoob Khan, and Youngku Sohn. Nanocomposites for Visible Light-induced Photocatalysis. Springer, 2017.

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Pradhan, Debabrata, Mohammad Mansoob Khan, and Youngku Sohn. Nanocomposites for Visible Light-induced Photocatalysis. Springer, 2018.

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Pawar, Rajendra, and Caroline Sunyong Lee. Heterogeneous Nanocomposite-Photocatalysis for Water Purification. Elsevier Science & Technology Books, 2015.

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Heterogeneous Nanocomposite-Photocatalysis for Water Purification. Elsevier, 2015. http://dx.doi.org/10.1016/c2014-0-02650-0.

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Book chapters on the topic "Photocatalytic nanocomposites"

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Ismail, N. J., H. S. Zakria, S. H. Mohamed Noor, et al. "CHAPTER 7. Photocatalytic Nanocomposites for Environmental Remediation." In Chemistry in the Environment. Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839165283-00161.

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Czech, B., M. A. Nazarkovsky, and V. M. Gun’ko. "Photocatalytic Activity of SnO2-Doped SiO2@TiO2 Nanocomposites." In Nanoscience Advances in CBRN Agents Detection, Information and Energy Security. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9697-2_25.

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Qin, Zuzeng, Tongming Su, and Hongbing Ji. "Photocatalytic Nanomaterials for the Energy and Environmental Application." In Multifunctional Nanocomposites for Energy and Environmental Applications. Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527342501.ch13.

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Zhang, Xiandi, Chui-Shan Tsang, and Lawrence Yoon Suk Lee. "Nanostructured Semiconductors for Photocatalytic CO2 Reduction." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_103-1.

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Jeevanandam, Jaison, Saikumar Manchala, and Michael K. Danquah. "Wastewater Treatment by Photocatalytic Biosynthesized Nanoparticles." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_137-1.

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Jeevanandam, Jaison, Saikumar Manchala, and Michael K. Danquah. "Wastewater Treatment by Photocatalytic Biosynthesized Nanoparticles." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-36268-3_137.

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Zhang, Xiandi, Chui-Shan Tsang, and Lawrence Yoon Suk Lee. "Nanostructured Semiconductors for Photocatalytic CO2 Reduction." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-36268-3_103.

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Achary, L. Satish K., Bapun Barik, and Priyabrat Dash. "Graphene Oxide-Polymer Nanocomposites Towards Sensing and Photocatalytic Applications." In Handbook of Polymer and Ceramic Nanotechnology. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10614-0_27-1.

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Achary, L. Satish K., Bapun Barik, and Priyabrat Dash. "Graphene Oxide-Polymer Nanocomposites Towards Sensing and Photocatalytic Applications." In Handbook of Polymer and Ceramic Nanotechnology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-40513-7_27.

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Bratovcic, Amra. "TiO2 – Based Nanocomposites for Photocatalytic Degradation of Dyes and Drugs." In New Technologies, Development and Application IV. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75275-0_93.

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Conference papers on the topic "Photocatalytic nanocomposites"

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Ge, Ming, Assaf Azouri, Kun Xun, Klaus Sattler, Joe Lichwa, and Chittaranjan Ray. "Solar Photocatalytic Degradation of Atrazine in Water by TiO2/Ag Nanocomposite." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17070.

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One of the most common herbicides in the world, Atrazine, was used as a model pollutant in this study. The photocatalytic activities of the nanocomposite of TiO2/Ag, with nanopaticles of TiO2 and Ag, were investigated by photodegradation of atrazine under the natural sun. It was found that the efficiency of solar-photocatalytic activity was increased significantly by using the nanocomposites of TiO2/Ag, compared to the use of TiO2 alone. The mechanism of the TiO2/Ag composite for enhancement of photocatalytic activity was elucidated in this work.

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Papoulis, Dimitris. "SEPIOLITE�TIO2 NANOCOMPOSITES: SYNTHESIS, CHARACTERIZATION PHOTOCATALYTIC ACTIVITY." In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019/6.1/s24.051.

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Aboul-Gheit, Ahmed K., Sawsan A. Mahmoud, and Yasser M. Moustafa. "Nanostructured Ti-Fe Thin Layered Photocatalyst via Sol-Gel Technique." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47033.

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The finding of of Zhu et al. [1] that iron-ion-doped TiO2 powders by hydrothermal hydrolysis and crystallization exhibited that the amount of doped iron ion significantly affected the phoyocatalytic degradation activity of XRG yellow dye and Fe optimum content could enhance photocatalytic activity under UV and visible light irradiation has encourage us to carry out this work. Hence, we prepared and examined the photocatalytic activities of a series of TiO2/Fe2O3 mixtures of thin layers of TiO2 and Fe2O3 using the sol-gel method and found that the TiO2(5)/Fe2O3(1) catalyst the most active for anthracene photodegradation. This catalyst acquired the highest surface area, proper pore size distribution and the smaller nano-particle size.

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Mahmoud, Sawsan A., A. Abdel Aal, and Ahmed K. Aboul-Gheit. "Nanocrystalline ZnO Thin Film for Photocatalytic Purification of Water." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47034.

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A thin film ZnO nanostructured catalyst exhibited a significantly greater superiority for the photodegradation of 2, 4, 6-TCP in water over photolysis via irradiation with UV of 254 nm wavelength. This ZnO photocatalyst was prepared via Zn metal evaporation and deposition on a glass sheet followed by calcination ature from 350 to 500 °C and the calcination time from 1 to 2h shows via SEM photography a decrease of ZnO nanoparticales sizes sheet followed by calcination (oxidation). Increasing the calcination temperature from 350 to 500 °C and the calcination time from 1 to 2h shows via SEM photography a decrease of ZnO nanoparticales sizes as well as the shape of their crystals finer needles, for which the crystallinity enhances as revealed by XRD. 2, 4, 6-Trichlorophenol was used as a model pollutant in water. Its photolysis using UV only or photocatalysis using UV irradiation in presence of the ZnO thin film catalyst indicated aromatic intermediates, which suffered of Cl by OH, addition of OH in a bare carbon in the aromatic ring, whereas in Photocatalysis deeper oxidation products, e.g., quinones and hydroquinones were also formed.

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Fauzian, M., A. Taufik, and R. Saleh. "Photocatalytic performance of Fe3O4/TiO2/Ag nanocomposites for photocatalytic activity under visible light irradiation." In INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2016 (ISCPMS 2016): Proceedings of the 2nd International Symposium on Current Progress in Mathematics and Sciences 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4991135.

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Ch-Th, Thomas, K. T. Drisya, M. Solis-Lopez, A. Romero-Nunez, and S. Velumani. "GO/BiVO4 NANOCOMPOSITES FOR Escherichia coli K12 PHOTOCATALYTIC INACTIVATION." In 2020 17th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE). IEEE, 2020. http://dx.doi.org/10.1109/cce50788.2020.9299170.

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P., Rajeswari, Prabhu S., Jothi Venkatachalam K., and Dhanuskodi S. "Photocatalytic degradation of Rhodamine B by metal oxide nanocomposites." In SPIE OPTO, edited by Ferechteh H. Teherani, David C. Look, and David J. Rogers. SPIE, 2015. http://dx.doi.org/10.1117/12.2079083.

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D'Angelo, D., S. Filice, S. Libertino, et al. "Photocatalytic properties of Nafion membranes containing graphene oxide/titania nanocomposites." In 2014 IEEE 9th Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2014. http://dx.doi.org/10.1109/nmdc.2014.6997420.

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Lili Feng, Guanhua Yue, and Xiaolu Qi. "Photocatalytic degradation of rhodamine B by TiO2/SBA-15 nanocomposites." In 2011 International Conference on Multimedia Technology (ICMT). IEEE, 2011. http://dx.doi.org/10.1109/icmt.2011.6002909.

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Barkhade, Tejal, and Indrani Banerjee. "Photocatalytic degradation of Rhodamine B dye using Fe doped TiO2 nanocomposites." In INTERNATIONAL CONFERENCE ON NANOMATERIALS FOR ENERGY CONVERSION AND STORAGE APPLICATIONS: NECSA 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5035218.

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Reports on the topic "Photocatalytic nanocomposites"

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Ruberu, Thanthrige P. Molecular level control of nanoscale composition and morphology: Toward photocatalytic nanocomposites for solar-to-chemical energy conversion of biomass. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1116717.

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Zaharieva, Katerina, Silvia Dimova, Mariya Kyulavska, et al. Photocatalytic Behaviour of Zinc Oxide/Polystyrene Nanocomposite for Removal of Malachite Green Dye under UV-Light. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2020. http://dx.doi.org/10.7546/crabs.2020.02.08.

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