Relevant bibliographies by topics / TiO2 as a photocatalyst

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'TiO2 as a photocatalyst'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "TiO2 as a photocatalyst"

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Tang, Jian Jun, and Shao Feng Li. "Organic Pollutants Decomposition by TiO2 Visible-Light Photocatalysis with H2O2 Assistance." Advanced Materials Research 807-809 (September 2013): 402–9. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.402.

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The effects of crystalline structure (Anatase and Rutile) and H2O2 addition on TiO2 visible-light photocatalysis were studied, which used reactive brilliant red X-3B and phenol as model pollutants. The results indicated that reactive brilliant red X-3B could be degradated by the two form TiO2(anatase or rutile) under visible-irradiation with the assistance of H2O2, however, when the surface sites of TiO2 photocatalysts were preeminently occupied by CO32-, photodecomposition could not be processed. Phenol could also be degradated by the two form TiO2 under visible-irradiation with the assistance of H2O2, rutile TiO2 exhibited a better photocatalytic activity, and its degradation ratio could be 80% after 120 min of reaction. The concentration of the ring intermediates detected during phenol decomposition was evidently higher when using rutile TiO2 as photocatalyst, and the presence of hydroxyl radical inhibitor (tert-butyl alcohol or methanol) had great effects on the degradation efficiency of rutile TiO2, but had less effects on anatase TiO2. The degradation of phenol occurred mainly in the solution when using rutile TiO2 as photocatalyst, and in contrast, the degradation occurred mainly at the TiO2 particles surface when using anatase TiO2 as photocatalyst.
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Shen, Yan Qin, and Hai Liang Wu. "The Photo-Catalytic Activity of Cu2+-Doped TiO2 and Applications in the Self-Cleaning Performance of Textile Wall Fabrics." Advanced Materials Research 557-559 (July 2012): 1475–78. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1475.

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TiO2 photocatalyst and copper-doped titania (Cu/TiO2) photocatalyst were prepared and both photocatalysts were used in the self-cleaning finishing of wall fabrics. XRD showed that the nanometer materials and textile wall fabrics were a good combination. By comparing the self-cleaning effects of two kinds of photocatalysts, the results demonstrate that textile wall fabrics finished with Cu2+-doped TiO2 photocatalyst have better self-cleaning effect under visible light.
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You, Wei. "Research Progresses and Development Trends of High-Efficacy Photocatalysts." Applied Mechanics and Materials 496-500 (January 2014): 532–35. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.532.

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Progresses of research on high-efficacy photocatalyst were introduced in this paper. Firstly, efficiency-strengthening methods of TiO2-serie photocatalysts were summarized basing on collected literatures, including photosensitization, alloying, moreover, novel photocatalysis materials and technologies and probable development tendencies in the future were introduced, such as broad-spectrum photocatalysts, broad-energy and energy-sensitive catalysts and high-efficacy controllable high-power photocatalysis materials and equipments.
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Jiang, Zhuoying, Sameera Wickramasinghe, Yu Hsin Tsai, Anna Cristina S. Samia, David Gurarie, and Xiong Yu. "Modeling and Experimental Studies on Adsorption and Photocatalytic Performance of Nitrogen-Doped TiO2 Prepared via the Sol–Gel Method." Catalysts 10, no. 12 (December 11, 2020): 1449. http://dx.doi.org/10.3390/catal10121449.

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Nitrogen-doped TiO2 has a great potential as a photocatalyst under visible light irradiation with applications in the removal of air and water pollutants, and the treatment of bacterial contaminations. In this study, nitrogen-doped TiO2 nanoparticles were synthesized via the sol–gel method and a post-annealing heat treatment approach. The effects of annealing treatment on the photocatalyst crystalline size and degree of crystallinity were analyzed. Methylene blue dye was used as the model water contaminant for the evaluation of the photoactivity of the synthesized nitrogen-doped TiO2 nanoparticles. The degradation of methylene blue was attributed to three mechanisms, i.e., adsorption, photocatalysis, and direct light photolysis. A kinetic model was developed to distinguish the impact of these three different mechanisms on the removal of contaminants. Adsorption and photocatalysis are heterogeneous processes for removing water organic contaminants. The characterization analysis demonstrates that they are relevant to the microstructures and surface chemical compositions of nitrogen-doped TiO2 photocatalysts. The processing–structure–performance relationship helped to determine the optimal processing parameters for nitrogen-doped TiO2 photocatalyst to achieve the best performance. While we used methylene blue as the model contaminant, the generalized quantitative model framework developed in this study can be extended to other types of contaminants after proper calibration.
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Xia, Qibin, Zhong Li, Hongxia Xi, and Kefeng Xu. "Activation Energy for Dibenzofuran Desorption from Fe3+/TiO2 and Ce3+/TiO2 Photocatalysts Coated onto Glass Fibres." Adsorption Science & Technology 23, no. 5 (June 2005): 357–66. http://dx.doi.org/10.1260/026361705774355469.

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In this work, TiO2, Fe3+/TiO2 and Ce3+/TiO2 photocatalytic films were respectively immobilized on glass fibres via the sol—gel technique to prepare supported photocatalysts. Temperature programmed desorption (TPD) experiments were conducted to measure the TPD curves for the removal of dibenzofuran from these photocatalysts, from which the activation energy for dibenzofuran desorption from the photocatalyst surfaces was estimated. The results showed that the activation energies for dibenzofuran desorption from the photocatalysts TiO2, Ce3+/TiO2 and Fe3+/TiO2 coated separately onto the glass fibres were 16.41 kJ/mol, 22.55 kJ/mol and 33.59 kJ/mol, respectively, while the hardness values of the ions Fe3+, Ce3+ and Ti4+ were respectively 13.1 eV, 11.9 eV and 10.6 eV. The data indicated that the use of Fe3+ or Ce3+ ions for doping a TiO2 photo-catalyst increased the local hardness of the doped TiO2 photocatalyst surface. This, in turn, increased the activation energy for the desorption of dibenzofuran from such a TiO2 photocatalyst surface.
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Noguchi, H., A. Nakajima, T. Watanabe, and K. Hashimoto. "Removal of bromate ion from water using TiO2 and alumina-loaded TiO2 photocatalysts." Water Science and Technology 46, no. 11-12 (December 1, 2002): 27–31. http://dx.doi.org/10.2166/wst.2002.0712.

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The effects of pH and the surface charge of photocatalyst on photocatalytic reduction of bromate ions in water were examined by using TiO2 and alumina-loaded TiO2 photocatalysts. The amount of adsorbed bromate ion on TiO2 and the reduction rate of bromate ion by the TiO2 photocatalyst increased with lowering pH. It was suggested that the bromate ion adsorbed predominantly on the positively charged surface sites of TiO2 at lower pH, which thus promotes the rate of reduction. The iso-electric point of the TiO2 photocatalyst was shifted to the higher pH region by loading alumina on the TiO2 surface, which resulted in the increase of the adsorbed amount of bromate on the photocatalyst and the reduction rate of bromate ion by the photocatalyst at neutral pH. It was concluded from these results that the photocatalytic reduction of bromate ion can be promoted by pH control of water or by controlling the surface charge of the photocatalyst by loading alumina without pH control of water.
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Wahyuni, Endang Tri, Titi Rahmaniati, Aulia Rizky Hafidzah, Suherman Suherman, and Adhitasari Suratman. "Photocatalysis over N-Doped TiO2 Driven by Visible Light for Pb(II) Removal from Aqueous Media." Catalysts 11, no. 8 (August 5, 2021): 945. http://dx.doi.org/10.3390/catal11080945.

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The photocatalysis process over N-doped TiO2 under visible light is examined for Pb(II) removal. The doping TiO2 with N element was conducted by simple hydrothermal technique and using urea as the N source. The doped photocatalysts were characterized by DRUVS, XRD, FTIR and SEM-EDX instruments. Photocatalysis of Pb(II) through a batch experiment was performed for evaluation of the doped TiO2 activity under visible light, with applying various fractions of N-doped, photocatalyst mass, irradiation time, and solution pH. The research results attributed that N doping has been successfully performed, which shifted TiO2 absorption into visible region, allowing it to be active under visible irradiation. The photocatalytic removal of Pb(II) proceeded through photo-oxidation to form PbO2. Doping N into TiO2 noticeably enhanced the photo-catalytic oxidation of Pb(II) under visible light irradiation. The highest photocatalytic oxidation of 15 mg/L Pb(II) in 25 mL of the solution could be reached by employing TiO2 doped with 10%w of N content 15 mg, 30 min of time and at pH 8. The doped-photocatalyst that was three times repeatedly used demonstrated significant activity. The most effective process of Pb(II) photo-oxidation under beneficial condition, producing less toxic and handleable PbO2 and good repeatable photocatalyst, suggest a feasible method for Pb(II) remediation on an industrial scale.
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Li, Jiaxin, Zhi Chen, Jianfei Fang, Qian Yang, Xiuru Yang, Wan Zhao, Dantong Zhou, Xiaoxiao Qian, Chunxi Liu, and Jianzhong Shao. "Facile synthesis of TiO2 film on glass for the photocatalytic removal of rhodamine B and tetracycline hydrochloride." Materials Express 9, no. 5 (August 1, 2019): 437–43. http://dx.doi.org/10.1166/mex.2019.1522.

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Photocatalysis is one of the efficient approaches for pollution control in water. However, the traditional photocatalysts used for the removal of organic pollutants are in powder form, which makes it difficult to recover them from the suspended reaction system. On the contrary, thin film photocatalyst is easy to be retrieved and possesses unique feature for practical application. In present work, stable TiO2 sol suspension was prepared and amorphous TiO2 thin film was then immobilized upon glass substrate through facile spin coating method. The thickness of film could be simply controlled by changing the number of coatings, and anatase TiO2 film could be formed after calcination. The prepared thin films were characterized with X-ray diffraction (XRD), ultravioletvisible spectrophotometry (UV-vis), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The photodegradations of organic pollutants including colored dye and colorless antibiotic were tested and found to be thickness-dependent. Additionally, the prepared film photocatalst has good stability and may have potential applications in wastewater treatment.
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Budi, Iis Setyo, Indriana Kartini, and Eko Sri Kunarti. "Photoreduction of Pb(II) Using TiO2 Catalyst Modified with Fe3O4 Nanoparticles." Key Engineering Materials 840 (April 2020): 79–83. http://dx.doi.org/10.4028/www.scientific.net/kem.840.79.

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The TiO2/Fe3O4 nanoparticle has been successfully synthesized and the material is then applied as a photocatalyst to reduce Pb(II). The Fe3O4 was synthesized through sono-coprecipitation method using NH4OH as a precipitating agent. The coating TiO2 onto Fe3O4 was performed respectively via hydrolysis reaction and sol-gel process using ammonium sulfate and TTIP as a reagent of TiO2. This study investigated several parameters such as the effect of time, equilibrium state and material responsiveness toward ultraviolet light. The XRD measurement indicated the presence of Fe3O4 and TiO2 while TEM image displayed the photocatalyst had a nanosized particle with approximately 60 nm in size. An activity test at pH 4, the equilibrium of photoreduction process showed at 60 minutes. The kinetic parameter of Pb(II) reduction at various catalyst presented that TiO2/Fe3O4 nanoparticle had better reduction rate constant than that of TiO2. Reusing of TiO2/Fe3O4 photocatalysts showed the results of Pb (II) photoreduction were not significantly decrease and the results of photocatalysis were still better than TiO2.
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He, Kang, Yu Chen, and Mengjun Mei. "Study on influencing factors of photocatalytic performance of CdS/TiO2 nanocomposite concrete." Nanotechnology Reviews 9, no. 1 (November 27, 2020): 1160–69. http://dx.doi.org/10.1515/ntrev-2020-0074.

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AbstractIn this study, a high-energy ball mill was used to composite nano-TiO2 and CdS, and three kinds of nanocomposite photocatalysts TiO2, CdS/TiO2-R400, and CdS/TiO2-R600 were prepared, which can respond to visible light. The photocatalytic concrete test block was prepared by mixing the nanocomposite photocatalyst and other masses with cement by incorporation method. To study the effect of the photocatalyst content on the photocatalytic performance of nanoconcrete, a total of four catalyst contents (0, 2%, 5%, and 8%) were set. The effects of high-temperature treatment (400°C) and different light sources (ultraviolet and visible light) on photocatalytic efficiency were also considered. The results show that the catalytic efficiency of CdS/TiO2-R400 under two light sources is higher than that of the other two photocatalysts. Compared to ultraviolet light sources, the photocatalytic efficiency of CdS/TiO2 nanocomposite concrete under visible light is lower, and the efficiency is below 9%. The optimal amounts of CdS/TiO2 nanocomposite photocatalyst under ultraviolet and visible light are 2% and 5%, respectively. The high-temperature treatment can improve the photocatalytic performance of CdS/TiO2 nanocomposite photocatalyst by 2% to 3%.
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Dissertations / Theses on the topic "TiO2 as a photocatalyst"

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Kashiwaya, Shun. "Science de surface et propriétés chimiques d'hétérostructures NiO/TiO2 monocristallin." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0241/document.

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Les photocatalyseurs à base de TiO2 ont été l’objet d’une grande attention comme une méthode durable de purification de l’air ou de l’eau, et de production d’hydrogène par décomposition de l’eau. Une stratégie avantageuse consiste à développer des héterostructures par couplage avec un autre oxyde métallique former une jonction de type Schottky ou avec un autre oxyde métallique pour créer une jonction p-n à l’interface de manière à prévenir les recombinaisons via une séparation de charge « vectorielle » à ces jonctions. De plus, les facettes cristallines jouent un rôle crucial dans le piégeage des porteurs de charge et, donc,dans les réactions rédox photoactivées. Ainsi, le dépôt sélectif de métal ou d’oxyde métallique sur des facettes spécifiques de nanocristaux de TiO2 devrait augmenter l’activité photocatalytique par l’amélioration de la séparation des charges. Dans ce travail, nous avons combiné l’emploi du cocatalyseur de type p NiO pour former des jonctions p-n avec son dépôt sélectif sur des nanocristaux de TiO2 anatase exposant des facettes bien définies. Par ailleurs, des expériences modèles de physique de surface ont été menées pour étudier les propriétés électroniques de ces hétérojonctions
TiO2 photocatalysts have attracted attention as a sustainable method for water/air purification and hydrogen production by water splitting. An advantageous strategy is the development of heterostructures by coupling metal oxides to create a p-n junction at their interface in order to prevent there combination by vectorial charge carrier separation at these energy junctions. In addition, crystal facets play a decisive role in the trapping of charge carriers and thus photocatalytic redox reactions. Thus, selective deposition of metal or metal oxides onto specific facets would enhance the photocatalytic activity by improving charge separation. In this work, we have combined the usage of p-type NiO co-catalyst to form p-n junction with its selective deposition onto the specific facet of oriented TiO2nanocrystal photocatalysts. Furthermore, the physical model experiments have been performed to investigate the electronic properties of these heterojunctions
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Fan, Ka Ho. "Synthesis and evaluation of macroporous TiO2 composite photocatalyst /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CENG%202006%20FAN.

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Duan, Aoshu. "Preparation and Characterization of TiO2-Based Nano Particles and Tests for Their Activities in Meth¬ylene Blue Photodegradation." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31378.

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A two-step hydrothermal method was applied to synthesis Vanadium Sulfide (IV) coupled with commercial P25 on TiO2 nanoparticle (VS4-on-P25). Materials were characterized by scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), ultraviolet–visible spectroscopy (UV-Vis), diffuse reflectance UV-Vis spectroscopy and Raman spectroscopy. Photocatalytic activity of this new material was determined by photo-degradation of Methylene blue (MB) under UV irradiation. Experiments show that the VS4-on-P25 exhibits a higher photocatalytic activity than commercial P25 by providing more active site for dye adsorption, and reducing the recombination of charge carriers. Furthermore, the VS4-on-P25 extends its light-absorption spectrum into visible-light range due to its narrower band gap. The highest photocatalytic activity was found with a VS4 loading of 6 wt.%, which outperforms pure P25 by a factor of 2.29 in MB degradation rate.
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Yamamoto, Akira. "Studies on Low-temperature De-NoX System over TiO2-based Photocatalysts." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/200501.

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Nascimento, Ulisses Magalhães. "Preparação, caracterização e testes catalíticos de um fotocatalisador magnético (Fe3O4/TiO2) na degradação de um poluente-modelo: acid blue 9." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-23042013-112144/.

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A aplicação de semicondutores no tratamento de água e efluentes líquidos é uma tecnologia de remediação ambiental promissora, em especial para poluentes orgânicos. Entre os vários semicondutores que também são fotocatalisadores, o TiO2 é amplamente usado em aplicações ambientais, por ser inerte biológica e quimicamente, ter elevado potencial de oxidação, baixo custo e estabilidade frente à corrosão. Entretanto, o TiO2 também tem algumas desvantagens, tais como: ele é excitado apenas por luz UV e requer uma operação unitária adicional (por exemplo, filtração ou centrifugação) para o reuso do catalisador. Para contornar estas limitações, usou-se um procedimento simples para a síntese de um fotocatalisador magnético (Fe3O4/TiO2) com alta área superficial específica e atividade catalítica, quando comparado com o TiO2 P25 da Evonik. O fotocatalisador foi sintetizado através de um procedimento em três etapas: (1) Partículas α-Fe2O3 foram obtidas por precipitação de uma solução de FeCl3.6H2O 0.01 mol L-1, que foi submetida a uma hidrólise forçada à 100°C por 48 h; (2) Partículas de α-Fe2O3/TiO2 foram obtidas por heterocoagulação de oxi-hidróxidos de Ti(IV) sobre as partículas de α-Fe2O3, as quais foram calcinada a 500°C por 2 h; e (3) As partículas \"casaca/caroço\" do fotocatalisador foram obtidas por calcinação a 400°C por 1 h sob atmosfera redutora (H2). A atividade fotocatalítica do material sintetizado foi avaliada aplicando-o no descoramento de uma solução do corante Azul Ácido 9 (C.I. 42090). Os efeitos do pH e da concentração de catalisador foram estimados por meio de um planejamento fatorial 22. Foi obtido um fotocatalisador com área superficial específica de 202 m2 g-1, facilmente separável do meio reacional em aproximadamente 2 min com o auxílio de um ímã. O fotocatalisador apresentou absorção em toda a região do visível. A maior remoção de cor (54%) foi obtida com pH 3,0, 1,0 g L-1 de catalisador e 2 horas de reação.
The use of semiconductors for treating polluted waters and wastewaters is a promising environmental remediation technology, especially for organic pollutants. Among the several semiconductors that are also photocatalysts, TiO2 is extensively used for environmental application, due to its biological and chemical inertness, high oxidation power, low cost, and stability regarding corrosion. However, TiO2 also has some disadvantages, such as: it is only UV-excited and requires an additional unit operation (e.g. filtration or centrifugation) for reuse purposes. In order to work around those limitations, a simple procedure for synthesizing a magnetic photocatalyst (Fe3O4/TiO2), with high specific surface area and good photocatalytic activity when compared to Evonik\'s TiO2 P25, was used. The photocatalyst was synthesized in a three-step procedure: (1) α-Fe2O3 particles were obtained, by precipitation, from FeCl3.6H2O 0.01 mol L-1, which underwent a forced acid hydrolysis at 100°C for 48 h; (2) α-Fe2O3/TiO2 particles were obtained, by heterocoagulation, of Ti(IV) oxide species on the α-Fe2O3, followed by calcination at 500°C for 2 h; and (3) The core/shell photocatalyst particles were obtained by calcination the α-Fe2O3/TiO2 particles at 400°C for 1 h under reducing atmosphere (H2). The photocatalytic activity of the synthesized material was assessed by the color removal of an Acid Blue 9 (C.I. 42090) dye solution. pH and catalyst dosage effects were estimated by a 22 factorial design. Fe3O4/TiO2 core/shell particles with specific surface area of 202 m2 g-1were obtained. They were easily separated from the reaction medium, in approximately 2 min, with the aid of a magnet. The photocatalyst absorbed radiation throughout the visible spectrum. The greatest color removal (54%) was achieved with pH 3.0, 1.0 g L-1 of photocatalyst, and 2 h of reaction.
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Akanksha, Tyagi. "Development of novel hybrid catalysis for carbon-carbon couplings by titanium oxide photocatalyst and metal cocatalyst." Kyoto University, 2018. http://hdl.handle.net/2433/232379.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(人間・環境学)
甲第21178号
人博第850号
新制||人||203(附属図書館)
29||人博||850(吉田南総合図書館)
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 吉田 寿雄, 教授 内本 喜晴, 教授 田部 勢津久
学位規則第4条第1項該当
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Youngman, Frank. "Optimization of TiO2 photocatalyst in an advanced oxidation process for the treatment of landfill leachate." Thesis, Florida Atlantic University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1523459.

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Since the United States Environmental Protection Agency (USEPA) began requiring landfills to implement a leachate collection system in 1991, the proper disposal of leachate has become a growing concern. The potential toxicity of landfill leachate will contaminate groundwater and soil if not managed properly. Research has been made in efforts to manage leachate in a cost-effective, single treatment process. Photocatalytic oxidation is an advanced oxidation process (AOP) which has shown ability to reduce toxicity of an array of leachate constituents including organics, inorganics and heavy metals. The purpose of this manuscript is to scale up the batch scale study of TiO2 photocatalytic degradation of leachate utilizing a pilot scale falling film reactor. In this research project, the use of UV/TiO2 for the removal of chemical oxygen demand (COD), ammonia, alkalinity and color will be studied in order to optimize catalyst dosage, determine pH effects and reaction kinetics and develop preliminary cost estimates.

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Karriem, Fatiema. "Oxidative fixation of dinitrogen by photocatalysis." Thesis, University of Western Cape, 2000. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5777_1267648612.

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The heterogeneous photocatalytic oxidation of dinitrogen to nitrate, NO3 and/or nitrite, no2 using peroxy species of titanium (IV) in aqueous suspensions has been investigated. The photocatalysts used were titanium peroxide and Degussa p25 TiO2 pretreated with H2O2. These photocatalysts were investigated by SEM and FTIR spectroscopy.  

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Jimenez, Romero Alex Manuel. "Nanoparticules à base d’oxyde de titane pour la photocatalyse." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112032/document.

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Des nanoparticules à base d’oxyde de titane ont été synthétisées par pyrolyse laser en vue de leur application dans le domaine de la photocatalyse. Le travail montre la souplesse de la méthode pour la synthèse de TiO2 et M-TiO2 (M= Pd, Fe, Cu, Si, N) à partir de tetraisopropoxyde de titane. Des sels organiques des métaux, de SiH4 et d’NH3 ont été utilisés pour introduire des atomes de Fe, Cu, Pd, Si et N dans des nanoparticules de TiO2. Les nanoparticules ont été analysées par microscopie électronique de transmission (MET), diffraction de rayons X (DRX), surface spécifique (SBET), spectroscopie des photoélectrons X (XPS), spectrométrie d’émission à torche plasma (ICP/OES). Leurs propriétés optiques ont été évaluées par spectroscopie de réflexion diffuse (DRS). L’activité photocatalytique des nanoparticules synthétisées a été évaluée dans la dégradation du bleu de méthylène, de l’acide formique et du phénol, sous d’irradiation UV et/ou UV-Visible. Les résultats ont été comparés à ceux obtenus dans les mêmes conditions avec le produit commercial Degussa P25 de chez Evonik.Les analyses montrent que les échantillons sont composés de nanoparticules sphériques avec une distribution de taille comprise entre 5 et 20 nm, la phase cristallographique majoritaire est le TiO2 anatase. Les surfaces développées en analyse BET sont importantes, autour de 80 m2/g (170 pour N-TiO2), comparées au produit commercial Degussa P25. Les analyses chimiques montrent que les atomes de Fe, Cu, Pd, Si et N sont efficacement introduits dans les nanoparticules de TiO2 avec des rendements MPoudre/MPrécurseur au moins égaux à 48%.Les échantillons de TiO2, Pd-TiO2 et Cu-TiO2 montrent une meilleure activité que TiO2 Degussa P25 vis-à-vis de la décomposition d’acide formique sous irradiation UV-Vis tandis que Fe-TiO2, Si-TiO2 et N-TiO2 sont moins actifs. L’effet de la concentration et de l’état d’oxydation du Pd dans le TiO2 a alors été étudié plus spécifiquement. L’addition de Pd sous la forme PdO diminue l’activité vis-à-vis de la décomposition de l’acide formique et du bleu de méthylène. Par contre l’addition de Pd sous la forme métallique améliore l’activité vis-à-vis de la dégradation du bleu de méthylène, d’acide formique et du phénol. Cette activité est toujours aussi importante après quatre cycles de photocatalyse.Nous avons également évalué l’activité des oxynitrures de titane et de N-TiO2 vis-à-vis de la dégradation de l’acide formique et de la décoloration du bleu de méthylène sous irradiation visible. Les oxynitrures présentent des activités faibles, qui semblent être améliorées par l’addition de palladium. L’échantillon N-TiO2 montre quant à lui des excellentes propriétés photocatalytiques vis-à-vis de la dégradation de l’acide formique sous irradiation visible tout en gardant une très bonne efficacité sous l’UV
Titanium based oxides nanoparticles were synthesized by laser pyrolysis and were tested as possible as photocatalysts. Using the laser pyrolysis method, this work shows that TiO2 and M-TiO2 (M = Pd, Fe, Cu, Si, N) can be easily synthesized in one step from titanium tetra isopropoxideprecursor mixed with organic salts of metals, SiH4 or NH3 to introduce atoms of Fe, Cu, Pd, Si and N in TiO2 nanoparticles. Nanoparticles were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller specific surface (SBET), X-photoelectron spectroscopy (XPS), and inductively coupled plasma spectroscopy (ICP/EOS). Their optical properties were measured by diffuse reflection spectroscopy (DRX). Photocatalytic activity of nanoparticles was evaluated using the degradation of methylene blue, formic acid and phenol tests under UV (360 nm) and/or UV-Visible(290-780nm) or pure visible radiation (455 nm). Results were compared to those of TiO2 Degussa P25 (from Evonik) obtained under same conditions.The nanoparticles are of spherical shape with a size distribution from 5 to 10 nanometers, there are mostly in anatase crystallographic phase. The specific surfaces area is always around 80 m2/g (170 m2/g for N-TiO2), indicating smaller size than TiO2 Degussa P25. Chemical analysis indicate that Fe, Cu, Pd, Si and N atoms are efficiently introduced into TiO2 powders. The mass ration MPowder/MPrecursor yield is always higher than 48%.Using the formic acid degradation test, TiO2, Pd-TiO2 and Cu-TiO2 were more active than TiO2 Degussa P25 test under UV-Vis radiation while Fe-TiO2, Si-TiO2 and N-TiO2 were less actives. Therefore, the influence of Pd amount/oxidation state upon the photocatalytic properties of Pd-TiO2 nanoparticles was studied in more details. Pd-TiO2 activity to degrade methylene blue, formic acid and phenol was improved in presence of metallic palladium. This activity is still important after 4 tests cycles.The activity of Titanium Oxynitride (exhibiting large shift of the optical gap towards the visible region) and N-doped TiO2 nanoparticles was also studied in formic acid and methylene blue degradation test under visible radiation. Oxynitrides exhibit low activity, which appears to be improved by the addition of palladium. This low activity could be related to the presence of an amorphous phase in the sample. N-TiO2 samples were active in formic acid degradation under visible radiation while keeping a very good efficiency in the UV
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Pickering, Jon W. "Applications of Optical Properties from Nanomaterials for Enhanced Activity of a Titania Photocatalyst under Solar Radiation." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5760.

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In recent years, employing advanced oxidation processes (AOPs) as a means of wastewater remediation has emerged as a promising route towards maintaining a sustainable global water management program. The heterogeneous photocatalytic oxidation process has been of particular interest due to the prospective of utilizing solar radiation as the driving force behind the degradation of pollutants. Of the photocatalyst studied to date, TiO2 remains the most attractive material for environmental applications due to its affordability, stability, biocompatibility and high quantum yield. A key draw back however is roughly only 5% of solar radiation incident on earth can provide the energy required (3.0-3.2 eV) to generate the electron-hole pairs necessary for photo-oxidation. As a means to improve the process under solar irradiance, optical properties such as surface plasmon resonance of metallic nanoparticles and upconversion luminescence of rare earth ions have been exploited for improved light harvesting as well as the generation of more usable UV light from lower energy photons. In order to explore these phenomena and their role in the enhancement of this AOP, the photocatalytic degradation of organic dyes was studied under various conditions employing Degussa P25 TiO2 as the photocatalyst. Ag nanocubes, Ag-Pd core-shell nanoparticles and YAG:Yb+3,Er+3 served as the dopants for the various studies which resulted in enhanced degradation rates, insight into the applicability of utilizing Yb+3 as sensitizing ion under solar radiation and a novel core-shell nanoparticle synthesis.
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Books on the topic "TiO2 as a photocatalyst"

1

Fujishima, Akira. TiOb2s photocatalysis: Fundamentals and applications. Tokyo, Japan: BKC, 1999.

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Grimes, Craig A., and Gopal K. Mor. TiO2 Nanotube Arrays. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0068-5.

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Augugliaro, Vincenzo. Clean by light irradiation: Practical applications of supported TiO₂. Cambridge: Royal Society of Chemistry, 2010.

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Li, Ji-Guang. TiO2 nanocrystals: Synthesis and enhanced functionality. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Civiš, Svatopluk, Martin Ferus, and Antonín Knížek. The Chemistry of CO2 and TiO2. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24032-5.

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Hajjaji, Anouar, Mosbah Amlouk, Mounir Gaidi, Brahim Bessais, and My Ali El Khakani. Chromium Doped TiO2 Sputtered Thin Films. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13353-9.

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Grimes, Craig A. TiO2 nanotube arrays: Synthesis, properties, and applications. Dordrecht: Springer, 2009.

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McMurray, Trudy Angela. The photocatalytic oxidation of model pollutants on TiO2 films. [S.l: The author], 2004.

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F, Ollis David, and Al-Ekabi H, eds. Photocatalytic purification and treatment of water and air: Proceedings of the 1st International Conference on TiO₂ Photocatalytic Purification and Treatment of Water and Air, London, Ontario, Canada, 8-13 November, 1992. Amsterdam: Elsevier, 1993.

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Akbari, Hashem. Evaluation of titanium dioxide as a photocatalyst for removing air pollutants: PIER final project report. [Sacramento, Calif.]: California Energy Commission, 2008.

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Book chapters on the topic "TiO2 as a photocatalyst"

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Irie, Hiroshi. "TiO2 Photocatalyst." In Encyclopedia of Applied Electrochemistry, 2081–86. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4419-6996-5_503.

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Zhang, Jinlong, Baozhu Tian, Lingzhi Wang, Mingyang Xing, and Juying Lei. "Phase Control of TiO2 Photocatalyst." In Lecture Notes in Chemistry, 133–72. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2113-9_6.

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Ullattil, Sanjay Gopal, Soumya B. Narendranath, and Pradeepan Periyat. "Black TiO2 : The New-Generation Photocatalyst." In Visible Light-Active Photocatalysis, 115–27. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527808175.ch5.

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Shi, Jianying, Xiuli Wang, Zhaochi Feng, Tao Chen, Jun Chen, and Can Li. "Photoluminescence Spectroscopic Studies on TiO2 Photocatalyst." In Nanostructure Science and Technology, 185–203. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-0-387-48444-0_7.

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Kuwahara, Yasutaka, Xufan Qian, and Hiromi Yamashita. "TiO2 Photocatalyst Supported on Surface-Modified Silica Supports." In Nanostructured Photocatalysts, 241–57. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_14.

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Manique, Marcia Cardoso. "TiO2 Nanotubes as Photocatalyst for Biodiesel Production." In Nanomaterials for Eco-friendly Applications, 49–66. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26810-7_4.

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Ohno, Teruhisa. "Development of Visible Light Responsive Morphology Controlled TiO2 Photocatalyst." In Nanostructured Photocatalysts, 79–98. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_4.

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Hajjaji, Anouar, Mosbah Amlouk, Mounir Gaidi, Brahim Bessais, and My Ali El Khakani. "TiO2 Photocatalysis." In Chromium Doped TiO2 Sputtered Thin Films, 75–84. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13353-9_5.

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Reddy, P. Anil Kumar, P. Venkata Laxma Reddy, and S. V. Prabhakar Vattikuti. "Black TiO2: An Emerging Photocatalyst and Its Applications." In Nanostructured Materials for Environmental Applications, 267–97. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72076-6_11.

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Higashimoto, Shinya. "Surface-Functionalized TiO2 Photocatalyst Modified by the Interfacial Surface Complex (ISC)." In Nanostructured Photocatalysts, 211–25. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_12.

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Conference papers on the topic "TiO2 as a photocatalyst"

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Zhuo Luo, Shiying Zhang, Difa Xu, Yang You, and Zhongxin Lin. "Composite photocatalyst of Glass-Microspheres/TiO2:Synthesis and photocatalysis activity." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5966097.

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Sano, Taizo, Nobuaki Negishi, Koji Takeuchi, and Sadao Matsuzawa. "Degradation of VOCs With Pt-TiO2 Photocatalyst and Concentrated Sunlight." In ASME 2004 International Solar Energy Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/isec2004-65072.

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A Parabolic trough concentrator (PTC) and a photocatalytic reactor with Pt-deposited TiO2 Photocatalyst were designed and constructed for the degradation of volatile organic compounds (VOCs). The temperature of photocatalyst coated on the sunlight receiver was easily elevated to around 473 K by PTC, and 79% of toluene or 93% of acetaldehyde was removed continuously, when gaseous toluene (15ppm) or acetaldehyde (400ppm) was passed through the reactor. The combination of sunlight concentrator and Pt-TiO2 catalyst exhibited the enhancement of complete degradation of VOCs, the inhibition of deactivation, and the reactivation of photocatalyst. The contributions of photocatalytic and catalytic activities of Pt-TiO2 were analyzed by using UV lamp and electric heater. Acetaldehyde was thermocatalytically degraded by photodeposited Pt on TiO2 at 343–463 K without UV irradiation, however the UV irradiation was necessary for the complete oxidation of acetaldehyde into CO2.
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Shaislamov, U. A., R. K. Kim, S. I. Kim, G. Komilkohn, J. M. Yang, and B. Yangi. "Fabrication of TiO2 Nanotubes for Photocatalyst Applications." In 2007 Digest of papers Microprocesses and Nanotechnology. IEEE, 2007. http://dx.doi.org/10.1109/imnc.2007.4456194.

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Shouman, Mahmoud A., Ahmed H. El-Shazly, Mohamed S. Salem, Mohamed R. Elmarghany, Essam M. Abo-Zahhad, Marwa F. Elkady, Mohamed Nabil Sabry, and Ali Radwan. "A Hepatic Sinusoids-Based Microreactor for Photocatalytic Degradation of Methylene Blue by Titanium Dioxide." In ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icnmm2020-1004.

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Abstract Microreactor technology is considered a state of art technology that gained great attention from researchers due to the high effectiveness and the small residence time compared with other regular reactors. Great research work has been established to involve microreators in a variety of applications, including fuel production, food and chemical industries, medical applications. In the present study, a hepatic sinusoids-based microreactor is experimentally tested in Methylene blue degradation using titanium dioxide (TiO2) photocatalyst activated with ultraviolet lamp of wavelength 365 nm. Purification of water using photocatalysis is considered a promising technology that attract the industrial community. Different operating conditions are investigated including; flow rate, Methylene blue concentration, and TiO2 concentration. 3 different dye concentrations are used (10 ppm, 20 ppm, and 30 ppm) with 3 different photocatalyst concentrations (100 ppm, 300 ppm, and 500 ppm). The flow rate has a span from 0.25 ml/min to 1 ml/min. Experiments are conducted to determine best operating conditions. Results show that the microreactor system can be effectively used in dye degradation with a very small residence time. A degradation of over 95% was reached at a TiO2 concentration of 300 ppm and a flow rate of 0.25 ml/min for all tested dye concentrations.
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Li, Songtian, Yonghua Cheng, and Hang Gao. "Preparation, Characterization and Photocatalysis Properties of Visible Spectral Response Photocatalyst CoPcS/TiO2/K2Ti4O9." In 2010 International Conference on Challenges in Environmental Science and Computer Engineering. IEEE, 2010. http://dx.doi.org/10.1109/cesce.2010.190.

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Siti Aida Ibrahim and Srimala Sreekantan. "Degradation of methyl orange using TiO2 as photocatalyst." In 2010 International Conference on Enabling Science and Nanotechnology (ESciNano). IEEE, 2010. http://dx.doi.org/10.1109/escinano.2010.5701009.

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Zhao, Li, Yi Zhao, Lei Jiang, and Yin-jie Liu. "Removal of nitrogen oxide using nano-TiO2 photocatalyst." In 2011 6th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2011. http://dx.doi.org/10.1109/iciea.2011.5976046.

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Dadjour, Mahmoud Farshbaf. "Improvement of Ultrasonic Disinfection Power Using TiO2 Photocatalyst." In 4TH INTERNATIONAL SYMPOSIUM ON THERAPEUTIC ULTRASOUND. AIP, 2005. http://dx.doi.org/10.1063/1.1901655.

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Hou, Haiyan, Dongsheng Zhu, and Jun Cheng. "Application of Nanometer TiO2 Photocatalysis Material in Air Purification." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21255.

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The production of oil mist in machinery processing workshop is harmful. To control concentration of oil mist, the TiO2 which can treat with manifold organic pollutants is used to purify oil mist. At first, the nanometer TiO2 is prepared using the sol-gel method on the optimum formulation that showed a higher activity. Then it is treated by dip-coating technique using the non-woven fabric as composite support. The efficiency of suppression of oil mist is compared with ordinary materials. With the increase of time, the purification of the nanometer TiO2 photocatalyst sieve against oil mist of non-woven fabric is investigated in solar radiation at room temperature. It oxidizes pollutants of oil mist to CO2 and H2O. The experiments demonstrat oil mist is oxidized on the TiO2 sol at the 22nd minute with a maximum capacity of 0.3219g. It infers from the experiments the photodegradation effect is high and the reaction is fast. It also concludes that the nanometer TiO2 photocatalysis material is an ideal material for suppressing oil mist in air. At last, a status the application of technology in air purification as well as its problems and trends are presented. The technique has a promising prospect to solve the increasing air problem of the workshop.
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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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Reports on the topic "TiO2 as a photocatalyst"

1

Peters, R. W., J. M. Wu, N. Meshkov, M. C. Thurnauer, and A. G. Ostafin. Use of cysteine-modified TiO{sub 2} photocatalyst for treatment of combined organic/inorganic wastewaters. Office of Scientific and Technical Information (OSTI), March 1995. http://dx.doi.org/10.2172/28267.

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Peters, R. W., J. M. Wu, N. Meshkov, M. C. Thurnauer, A. E. Ostafin, and T. Rajh. Combined photooxidation/photoreduction using TiO{sub 2} photocatalysts to treat organic/inorganic metal-laden wastewaters. Office of Scientific and Technical Information (OSTI), March 1995. http://dx.doi.org/10.2172/28268.

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McNulty, Thomas F. Solar Water Splitting: Photocatalyst Materials Discovery and Systems Development. Office of Scientific and Technical Information (OSTI), May 2008. http://dx.doi.org/10.2172/927771.

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Fowler, Simon. Design and Application of a 3D Photocatalyst Material for Water Purification. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.5532.

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Reyes, Karla, Zachary Stephens, and David Robinson. Composite WO3/TiO2 nanostructures for high electrochromic activity. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1089995.

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LORIER, TROY. Evaluation of the TiO2 Limit for DWPF Glass. Office of Scientific and Technical Information (OSTI), March 2004. http://dx.doi.org/10.2172/822650.

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Li, Yiyang, Elliot Fuller, and Albert Talin. Redox transistors based on TiO2 for analogue neuromorphic computing. Office of Scientific and Technical Information (OSTI), August 2020. http://dx.doi.org/10.2172/1647700.

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Oldenburg, Steven, and John Holecek. Surface Modified TiO2 Obscurants for Increased Safety and Performance. Fort Belvoir, VA: Defense Technical Information Center, November 2012. http://dx.doi.org/10.21236/ada581972.

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Allen, Jan L., Ivan C. Lee, and Jeff Wolfenstine. Biomimetic Approach to Solar Cells Based on TiO2 Nanotubes. Fort Belvoir, VA: Defense Technical Information Center, April 2008. http://dx.doi.org/10.21236/ada480572.

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Diebold, Ulrike. GROWTH, SURFACE CHARACTERIZATION, AND REACTIVITY OF TIO2 ANATASE FILMS-EPSCOR. Office of Scientific and Technical Information (OSTI), December 2004. http://dx.doi.org/10.2172/835107.

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