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Effects of Preparation Methods of Pd Supported on (001) Crystal Facets Exposed TiO2 Nanosheets for Toluene Catalytic Combustion. Catalysts 2022. [DOI: 10.3390/catal12111406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A series of TiO2 nanosheets-supported Pd catalysts were individually prepared by impregnation, deposition–precipitation, photo-deposition and in situ reduction by NaBH4. For comparison, Pd supported on P25 was prepared by the impregnation method. The experimental results show that the catalytic efficiency of the catalyst prepared with titanium dioxide nano sheet as the support is higher than that of the catalyst supported with P25. Its excellent properties are as follows: The resulting sample indicates that TiO2 nanosheets-supported Pd catalyst display an improved activity than Pd/P25, whose temperature of 100% complete conversion of toluene decreased by 40 ℃ at the most. The Pd particles on the catalyst synthesized by the light deposition method and the NaBH4 reduction method are more obvious, while the Pd particles on the catalyst synthesized by the immersion method and the deposition–precipitation method are less obvious, which shows that the latter two methods are more conducive to the dispersion of Pd. The good catalytic activity may be due to the better exposed mirror and dispersion of titanium dioxide nanosheets. This is mainly related to the exposed crystal plane of the nanosheet TiO2 (001), which made it easier to form the oxygen vacancy. Moreover, among all of the TiO2 nanosheets-supported Pd catalysts, Pd/TiO2 NS (TiO2 NS means TiO2 nanosheets) prepared by the impregnation method show the highest catalytic activity. The XRD results show that Pd prepared by impregnation is more dispersed and smaller. This is due to PdO being dispersed more efficiently than the others, leading to more Pd active sites.
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Spáčilová M, Krejcikova S, Maleterova Y, Kastanek F, Solcova O. Scale-up of photoreactor with TiO 2 thin layer for wastewater treatment. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2022; 86:1981-1990. [PMID: 36315090 DOI: 10.2166/wst.2022.313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
This study is devoted to the scale-up potential of TiO2/UV photocatalyst for real wastewater treatment including its durability tests. The activity of the prepared TiO2 layers was first tested in a laboratory reactor on key representative pollutants diclofenac, chloramphenicol and triclosan. A special pilot plant reactor of a two-tube system with 21 stainless steel annulets covered by TiO2 thin layers and the inner volume of 3.5 L was constructed. Pilot tests were performed with wastewater from the pharmaceutical industry containing danazol and norethisterone with the concentration varying between 4 and 7 mg L-1 at the flow 18 L h-1 and municipal wastewater at the output sewage plant for 67,000 inhabitants containing bisphenol A, 4-nonyphenol, estron, ethinylestradiol and triclosan in the concentrations of the individual contaminants varying between 50 and 600 ng L-1 at the flow 200 L h-1. After the treatment during the pilot photocatalytic test, the concentration of individual contaminants decreased by 82-100%, while no decrease in the efficiency of the photocatalytic process was recorded during the long-term tests lasting for 3-6 months.
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Affiliation(s)
- Markéta Spáčilová
- Department of Catalysis and Reaction Engineering, Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 1/135, 165 02 Prague 6, Czech Republic E-mail:
| | - Simona Krejcikova
- Department of Catalysis and Reaction Engineering, Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 1/135, 165 02 Prague 6, Czech Republic E-mail:
| | - Ywetta Maleterova
- Department of Catalysis and Reaction Engineering, Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 1/135, 165 02 Prague 6, Czech Republic E-mail:
| | - Frantisek Kastanek
- Department of Catalysis and Reaction Engineering, Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 1/135, 165 02 Prague 6, Czech Republic E-mail:
| | - Olga Solcova
- Department of Catalysis and Reaction Engineering, Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 1/135, 165 02 Prague 6, Czech Republic E-mail:
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Pian C, Peng W, Ren H, Ma C, Su Y, Ti R, Chen X, Zhu L, Liu J, Sun X, Wang B, Niu B, Wu D. Robust α-Fe2O3@TiO2 Core–Shell Structures With Tunable Buffer Chambers for High-Performance Lithium Storage. Front Chem 2022; 10:866369. [PMID: 35464221 PMCID: PMC9021487 DOI: 10.3389/fchem.2022.866369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 02/23/2022] [Indexed: 11/13/2022] Open
Abstract
α-Fe2O3 has high potential energy storage capacity and can serve as a green and low-cost anode material for lithium-ion batteries. However, α-Fe2O3 suffers large volume expansion and pulverization. Based on DFT calculations, TiO2 can effectively maintain the integrity of the crystal structure during the discharge/charge process. Well-defined cubic α-Fe2O3 is coated with a TiO2 layer using the hydrothermal method with the assistance of oxalic acid surface treatment, and then α-Fe2O3@TiO2 with tunable buffer chambers is obtained by altering the hydrochloric acid etching time. With the joint efforts of the buffer chamber and the robust structure of the TiO2 layer, α-Fe2O3@TiO2 alleviates the expansion of α-Fe2O3 during the discharge/charge process. The optimized sample (FT-1h) achieves good cycling performance. The reversible specific capacity remains at 893.7 mA h g-1, and the Coulombic efficiency still reaches up to 98.47% after 150 cycles at a current density of 100 mA g−1. Furthermore, the reversible specific capacity can return to 555.5 mA h g−1 at 100 mA g−1 after cycling at a high current density. Hence, the buffer chamber and the robust TiO2 layer can effectively improve the cycling stability and rate performance of α-Fe2O3.
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Affiliation(s)
- Chunyuan Pian
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Weichao Peng
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
| | - Haoyu Ren
- Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
| | - Chao Ma
- School of Mechanical and Electrical Engineering, Xinxiang University, Xinxiang, China
| | - Yun Su
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Ruixia Ti
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Xiuyu Chen
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Lixia Zhu
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Jingjing Liu
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Xinzhi Sun
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
| | - Bin Wang
- School of Physics and Electronic Engineering, Xinxiang University, Xinxiang, China
- *Correspondence: Bin Wang, ; Bingxuan Niu, ; Dapeng Wu,
| | - Bingxuan Niu
- Collage of Pharmacy, College of Biomedical Engineering, Xinxiang Medical University, Xinxiang, China
- *Correspondence: Bin Wang, ; Bingxuan Niu, ; Dapeng Wu,
| | - Dapeng Wu
- Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
- School of Environment, Henan Normal University, Xinxiang, China
- *Correspondence: Bin Wang, ; Bingxuan Niu, ; Dapeng Wu,
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Elavarasan M, Yang W, Velmurugan S, Chen JN, Chang YT, Yang TCK, Yokoi T. In-situ infrared investigation of m-TiO2/α-Fe2O3 photocatalysts and tracing of intermediates in photocatalytic hydrogenation of CO2 to methanol. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2021.101864] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Hou C, Hao J. A three-dimensional nano-network WO 3/F-TiO 2-{001} heterojunction constructed with OH-TiOF 2 as the precursor and its efficient degradation of methylene blue. RSC Adv 2021; 11:26063-26072. [PMID: 35479479 PMCID: PMC9037076 DOI: 10.1039/d1ra04809k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 07/12/2021] [Indexed: 12/18/2022] Open
Abstract
In this study, three-dimensional nested WO3/F-TiO2-{001} photocatalysts with different WO3 loadings were prepared by a hydrothermal process and used to degrade methylene blue (MB). The photocatalysts with various ratios of WO3 to OH-TiOF2 can be transformed into a three-dimensional network WO3/F-TiO2 hetero-structure with {001} surface exposure. The results showed that the composite catalyst with 5% WO3, denoted as FWT5, had the best comprehensive degradation effect. FWT5 has a limited band gap of 2.9 eV, which can be used as an advanced photocatalyst to respond to sunlight and degrade MB. The average pore diameter of the composite catalyst is 10.3 nm, and the multi-point specific surface area is 56 m2 g−1. Compared with pure TiOF2, the average pore size of the composite catalyst decreased by 8.44 nm and the specific surface area increased by 51.2 m2 g−1, which provides a larger contact space for the catalytic components and pollutants. Moreover, TiO2 on the {001} surface has higher photocatalytic activity and methylene blue can be better degraded. Under the irradiation of 0.03 g FWT5 composite catalyst with a simulated solar light source for 2 h, the degradation rate of 10 mg L−1 methylene blue can reach 82.9%. The trapping experiment showed that photo-generated holes were the principal functional component of WO3/F-TiO2-{001} photo-catalysis, which could capture OH− and form hydroxyl radical (˙OH) and improved the photocatalytic degradation performance. Kinetic studies show that the photocatalytic degradation of MB fits with the quasi-first order kinetic model. A new type of WO3/F-TiO2-{001} heterostructure semiconductor material with a three-dimensional network structure was successfully prepared by the hydrothermal method.![]()
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Affiliation(s)
- Chentao Hou
- Department of Environmental Engineering, Xi'an University of Science and Technology Xi'an 710054 China
| | - Jing Hao
- Department of Environmental Engineering, Xi'an University of Science and Technology Xi'an 710054 China
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He H, Wang X, Cheng C, Yang S, Wang X, Liu Q, Wang Y, Wang Z, Zhang L, Sun C. Degradation of organophosphorus flame retardant tri(chloro-propyl)phosphate (TCPP) by (001) crystal plane of TiO 2 photocatalysts. ENVIRONMENTAL TECHNOLOGY 2021; 42:1612-1622. [PMID: 31587596 DOI: 10.1080/09593330.2019.1675771] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 09/26/2019] [Indexed: 06/10/2023]
Abstract
This paper demonstrates the successful synthesis of TiO2 with (001) crystal plane; its morphology and structure were characterized using XRD, TEM and Raman spectrometer. The results showed that TiO2 nanosheets were bounded by (001) facets on both the top and bottom. TiO2-001/UV photocatalytic process was proved to be a powerful method for degrading tri(chloro-propyl) phosphate (TCPP) in aqueous solution. Under the given parameters, 95% of TCPP was removed in 360 min. The photodegradation followed the pseudo-first-order kinetic reaction. The reactive species during photocatalytic oxidation of TiO2-001 was mainly hydroxyl radical. TCPP was decomposed into small molecule organics by hydroxyl radicals, along with the release of PO43- and Cl-, and most of these intermediates were eventually degraded into carbon dioxide and water.
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Affiliation(s)
- Huan He
- School of Environment, Nanjing Normal University, Nanjing, People's Republic of China
| | - Xiaohan Wang
- School of Environment, Nanjing Normal University, Nanjing, People's Republic of China
| | - Chen Cheng
- School of Chemistry and Life Science, Chengdu Normal University, Chengdu, People's Republic of China
| | - Shaogui Yang
- School of Environment, Nanjing Normal University, Nanjing, People's Republic of China
| | - Xiaomen Wang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China
| | - Qing Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China
| | - Yong Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jinlin, People's Republic of China
| | - Zunyao Wang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China
| | - Limin Zhang
- School of Environment, Nanjing Normal University, Nanjing, People's Republic of China
| | - Cheng Sun
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, People's Republic of China
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Elavarasan M, Uma K, Yang TCK. Nanocubes phase adaptation of In2O3/TiO2 heterojunction photocatalysts for the dye degradation and tracing of adsorbed species during photo-oxidation of ethanol. J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2021.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Li X, Wu X, Liu S, Li Y, Fan J, Lv K. Effects of fluorine on photocatalysis. CHINESE JOURNAL OF CATALYSIS 2020. [DOI: 10.1016/s1872-2067(20)63594-x] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Photocatalytic Degradation of Rhodamine B by C and N Codoped TiO2 Nanoparticles under Visible-Light Irradiation. J CHEM-NY 2020. [DOI: 10.1155/2020/4310513] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
C and N codoped TiO2 nanoparticles were synthesized via a solvothermal method. The degradation of Rhodamine B by the photocatalyst C, N-TiO2 was investigated under visible-light irradiation generated by using a 36 W compact fluorescent lamp which is characterized by wavelengths from 400 to 650 nm. The structure and properties of the obtained photocatalyst have been systematically investigated using X-ray diffraction, TEM, UV-Vis, FT-IR, and BET techniques. The experimental results revealed that C, N codoped TiO2 nanoparticles were successfully synthesized, with an average diameter of 9.1 nm. C, N-TiO2 nanoparticles exhibited an energy band gap of 2.90 eV, which were lower than pristine TiO2 (3.34 eV), C-TiO2 (3.2 eV), and N-TiO2 (3.03 eV). The degradation of Rhodamine B by C, N-TiO2 indicated that, under visible-light irradiation, the optimal dose of the photocatalyst was 1.8 g/L, and the removal of Rhodamine B was almost complete after 3 hours of reaction. The photocatalytic degradation of Rhodamine B in the range of 5–100 mg/L showed that the process followed the first-order kinetics according to the Langmuir–Hinshelwood model. The highest apparent rate constant (0.0427 min−1) was obtained when the initial concentration of Rhodamine B was 5 mg/L, whereas the former decreased with the increase in the initial concentration of Rhodamine B. Moreover, C and N codoped TiO2 nanoparticles presented a high potential for recycling, which was characterized by a removal efficiency of more than 86% after three cycles.
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Wang J, Wang Y, Wang W, Peng T, Liang J, Li P, Pan D, Fan Q, Wu W. Visible light driven Ti 3+ self-doped TiO 2 for adsorption-photocatalysis of aqueous U(VI). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 262:114373. [PMID: 32443204 DOI: 10.1016/j.envpol.2020.114373] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 03/03/2020] [Accepted: 03/12/2020] [Indexed: 06/11/2023]
Abstract
The photocatalytic reduction of U(VI) is recognized as an economical and effective way for U(VI) removal/recovery from solutions. To improve the photocatalytic activity of TiO2 under visible light, TiO2 was hydrogenated by NaBH4 to generate Ti3+ self-doped black TiO2 (BTn). The self-doped Ti3+ alongside oxygen vacancies (Ov) could act as interband level to increase visible light capture and reduce the recombination of photogenerated carriers. The obtained BTn samples showed high performance for U(VI) elimination under near neutral conditions, and held an outstanding anti-interference for U(VI) over competing metal cations and anions. Methanol and ethanol could act as sacrificial donors, being favorable for the photocatalytic reduction of U(VI), while the presence of EDTA inhibited the photoreduction of U(VI). The BTn photocatalysts showed relatively high stability and reusability during the photocatalysis and elution processes. The XPS, TEM and XRD results revealed that U(VI) was photo-reduced to form UO2 on the surface of BTn. This work may serve as an important reference for improving the photocatalytic reactivity of TiO2 as well as for the efficient removal/recovery of U(VI) from aqueous solutions.
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Affiliation(s)
- Jingjing Wang
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China
| | - Yun Wang
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China
| | - Wei Wang
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China
| | - Tong Peng
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China
| | - Jianjun Liang
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China
| | - Ping Li
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China.
| | - Duoqiang Pan
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Qiaohui Fan
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China
| | - Wangsuo Wu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
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12
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SPR effect of Au nanoparticles on the visible photocatalytic RhB degradation and NO oxidation over TiO2 hollow nanoboxes. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2019.08.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Wu JM, Xing H. Facet-dependent decoration of TiO 2 mesocrystals on TiO 2 microcrystals for enhanced photoactivity. NANOTECHNOLOGY 2020; 31:025604. [PMID: 31550700 DOI: 10.1088/1361-6528/ab4778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Bottom-up constructions of hierarchical TiO2 are effective to enhance their photoactivity towards degradations of organic pollutants. Thanks to highly active facets, {001} exposed anatase TiO2 microcrystals attract much attention in photocatalysis; yet their efficiency is limited by the large crystal size. Herein, we report a facile solution approach to deposit anatase TiO2 mesocrystals only on {101} facets of anatase TiO2 microcrystals. The selective surface decoration enhances the photoactivity through replacing the less active {101} facets with more active TiO2 mesocrystals; whilst the highly active {001} facets remain untouched. When utilized to assist photodegradation of phenol in water under UV light illumination, the hierarchical TiO2 exhibited a reaction rate constant doubled that of the pristine {001} exposed TiO2 microcrystals. The present tactic to selectively decorate TiO2 microcrystals may give hints to other applications involving facet-dependent properties.
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Jian Y, Liu H, Zhu J, Zeng Y, Liu Z, Hou C, Pu S. Transformation of novel TiOF2 nanoparticles to cluster TiO2-{001/101} and its degradation of tetracycline hydrochloride under simulated sunlight. RSC Adv 2020; 10:42860-42873. [PMID: 35514916 PMCID: PMC9058001 DOI: 10.1039/d0ra08476j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 11/19/2020] [Indexed: 11/21/2022] Open
Abstract
The anatase type cluster TiO2-{001/101} was rapidly generated by a one-step hydrothermal method. The transformation process of coral-like TiOF2 nanoparticles to cluster TiO2-{001/101} was investigated for the first time, and the sensitization between cluster TiO2-{001/101} and tetracycline hydrochloride (TCH) was also discussed. The degradation rate of TCH by cluster TiO2-{001/101} under simulated sunlight was 92.3%, and the total removal rate was 1.76 times that of P25. Besides, cluster TiO2-{001/101} settles more easily than P25 in deionized water. The study showed that cluster TiO2-{001/101} derived from coral-like TiOF2 nanoparticles had a strong adsorption effect on TCH, which was attributed to the oxygen vacancy (Ov) and {001} facets of cluster TiO2-{001/101}. The strong adsorption effect promoted the sensitization between cluster TiO2-{001/101} and TCH, and widened the visible light absorption range of cluster TiO2-{001/101}. In addition, the fluorescence emission spectrum showed that cluster TiO2-{001/101} had a lower luminous intensity, which was attributed to the heterojunction formed by {001} facets and {101} facets that reduces the recombination rate of carriers. It should be noted that cluster TiO2-{001/101} still has good degradation performance for TCH after five cycles of degradation. This study provides a new idea for the synthesis of cluster TiO2-{001/101} with high photocatalytic performance for the treatment of TCH wastewater. Degradation of tetracycline hydrochloride by cluster TiO2-{001/101} under simulated sunlight.![]()
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Affiliation(s)
- Yue Jian
- Chongqing Academy of Animal Sciences
- Chongqing 402460
- China
- Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest
- Ministry of Agriculture and Rural Affairs
| | - Huayang Liu
- College of Geology and Environment
- Xi'an University of Science and Technology
- Xi'an 710054
- China
| | - Jiaming Zhu
- Chongqing Academy of Animal Sciences
- Chongqing 402460
- China
- Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest
- Ministry of Agriculture and Rural Affairs
| | - Yaqiong Zeng
- Chongqing Academy of Animal Sciences
- Chongqing 402460
- China
- Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest
- Ministry of Agriculture and Rural Affairs
| | - Zuohua Liu
- Chongqing Academy of Animal Sciences
- Chongqing 402460
- China
| | - Chentao Hou
- College of Geology and Environment
- Xi'an University of Science and Technology
- Xi'an 710054
- China
| | - Shihua Pu
- Chongqing Academy of Animal Sciences
- Chongqing 402460
- China
- Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest
- Ministry of Agriculture and Rural Affairs
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Facile in situ hydrothermal synthesis of titania nanosheets on reduced graphene oxide with photocatalytic activity. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.112085] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Xing H, Wen W, Wu JM. Enhanced UV photoactivity of Ti3+ self-doped anatase TiO2 single crystals hydrothermally synthesized using Ti-H2O2-HF reactants. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.111958] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Abdul Haroon Rashid SSA, Sabri YM, Kandjani AE, Harrison CJ, Canjeevaram Balasubramanyam RK, Della Gaspera E, Field MR, Bhargava SK, Tricoli A, Wlodarski W, Ippolito SJ. Zinc Titanate Nanoarrays with Superior Optoelectrochemical Properties for Chemical Sensing. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29255-29267. [PMID: 31339291 DOI: 10.1021/acsami.9b08704] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this report, the gas sensing performance of zinc titanate (ZnTiO3) nanoarrays (NAs) synthesized by coating hydrothermally formed zinc oxide (ZnO) NAs with TiO2 using low-temperature chemical vapor deposition is presented. By controlling the annealing temperature, diffusion of ZnO into TiO2 forms a mixed oxide of ZnTiO3 NAs. The uniformity and the electrical properties of ZnTiO3 NAs made them ideal for light-activated acetone gas sensing applications for which such materials are not well studied. The acetone sensing performance of the ZnTiO3 NAs is tested by biasing the sensor with voltages from 0.1 to 9 V dc in an amperometric mode. An increase in the applied bias was found to increase the sensitivity of the device toward acetone under photoinduced and nonphotoinduced (dark) conditions. When illuminated with 365 nm UV light, the sensitivity was observed to increase by 3.4 times toward 12.5 ppm acetone at 350 °C with an applied bias of 9 V, as compared to dark conditions. The sensor was also observed to have significantly reduced the adsorption time, desorption time, and limit of detection (LoD) when excited by the light source. For example, LoD of the sensor in the dark and under UV light at 350 °C with a 9 V bias is found to be 80 and 10 ppb, respectively. The described approach also enabled acetone sensing at an operating temperature down to 45 °C with a repeatability of >99% and a LoD of 90 ppb when operated under light, thus indicating that the ZnTiO3 NAs are a promising material for low concentration acetone gas sensing applications.
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Affiliation(s)
| | | | | | | | - Ram Kumar Canjeevaram Balasubramanyam
- School of Engineering , RMIT University , Melbourne 3001 , Victoria , Australia
- CNRS, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) , University of Bordeaux , UMR 5026, 87, Avenue du Docteur Schweitzer , Pessac Cedex F-33608 , France
| | | | | | | | - Antonio Tricoli
- Nanotechnology Research Laboratory, Research School of Engineering , Australian National University , Canberra 2601 , Australian Capital Territory , Australia
| | - Wojtek Wlodarski
- School of Engineering , RMIT University , Melbourne 3001 , Victoria , Australia
| | - Samuel J Ippolito
- School of Engineering , RMIT University , Melbourne 3001 , Victoria , Australia
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Zeng L, Sun H, Peng T, Lv X. Comparison of the Phase Transition and Degradation of Methylene Blue of TiO 2, TiO 2/Montmorillonite Mixture and TiO 2/Montmorillonite Composite. Front Chem 2019; 7:538. [PMID: 31448258 PMCID: PMC6691041 DOI: 10.3389/fchem.2019.00538] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 07/15/2019] [Indexed: 11/13/2022] Open
Abstract
Nano-TiO2 (T), TiO2/montmorillonite mixture (Mix), and TiO2/montmorillonite composite (Com) were prepared by using TiOSO4•2H2O as the precursor of TiO2 and montmorillonite as the matrix. The phase transition process of TiO2 and the degradation of methylene blue (MB) in T, Mix, and Com were studied by x-ray diffraction (XRD), infrared spectrum (IR), scanning electron microscopy with energy spectrum (SEM-EDS), and other methods. The results show that, except for the fact that the heating temperature has a great influence on the phase transition and grain growth of TiO2, the introduction of montmorillonite has an obvious inhibition effect on the phase transition and grain growth of TiO2, and the inhibition effect of the Com is obviously stronger than Mix. In Com, Ti–O–Si chemical bond was formed between TiO2 and oxygen atoms with negative charge on the bottom of the structure layer of montmorillonite, which is the main reason for inhibition effect. However, in Mix, TiO2 only covers the surface of montmorillonite without breaking the degree of order of montmorillonite and forming no chemical bond with montmorillonite, so the inhibition effect is small. From degradation of MB, it was found that before the structure of montmorillonite was destroyed (400–600°C), the total degradation percentage in Mix (85.3–99.5%) was higher than T and Com. At high temperature (above 700°C), because of the inhibition effect, the total degradation percentage of MB in Com is much larger than T and Mix, even above 1,100°C, the total degradation percentage can still reach at 47%. Therefore, in industrial applications, Mix and Com can be selected to degradation MB, according to the actual application temperature range.
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Affiliation(s)
- Li Zeng
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Ministry of Education, Mianyang, China.,School of Architecture and Civil Engineering, Chengdu University, Chengdu, China
| | - Hongjuan Sun
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Ministry of Education, Mianyang, China
| | - Tongjiang Peng
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Ministry of Education, Mianyang, China
| | - Xia Lv
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Ministry of Education, Mianyang, China
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19
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Zhang Y, Liu Y, Gao W, Chen P, Cui H, Fan Y, Shi X, Zhao Y, Cui G, Tang B. MoS 2 Nanosheets Assembled on Three-Way Nitrogen-Doped Carbon Tubes for Photocatalytic Water Splitting. Front Chem 2019; 7:325. [PMID: 31165056 PMCID: PMC6534068 DOI: 10.3389/fchem.2019.00325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 04/23/2019] [Indexed: 12/01/2022] Open
Abstract
In this work, a micron-sized three-way nitrogen-doped carbon tube covered with MoS2 nanosheets (TNCT@MoS2) was synthesized and applied in photocatalytic water splitting without any sacrificial agents for the first time. The micron-sized three-way nitrogen-doped carbon tube (TNCT) was facilely synthesized by the calcination of commercial sponge. The MoS2 nanosheets were assembled on the carbon tubes by a hydrothermal method. Compared with MoS2, the TNCT@MoS2 heterostructures showed higher H2 evolution rate, which was ascribed to the improved charge separation efficiency and the increased active sites afforded by the TNCT.
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Affiliation(s)
- Yujia Zhang
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Yan Liu
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Wen Gao
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Ping Chen
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Hongyu Cui
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Yanfei Fan
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Xifeng Shi
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Yingqiang Zhao
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Guanwei Cui
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
| | - Bo Tang
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, China
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20
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Li Y, Yang M, Tian Z, Luo N, Li Y, Zhang H, Zhou A, Xiong S. Assembly of Copper Phthalocyanine on TiO 2 Nanorod Arrays as Co-catalyst for Enhanced Photoelectrochemical Water Splitting. Front Chem 2019; 7:334. [PMID: 31157207 PMCID: PMC6530342 DOI: 10.3389/fchem.2019.00334] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 04/24/2019] [Indexed: 12/24/2022] Open
Abstract
A photoelectrochemical device was achieved by interfacial self-assembly of macrocyclic π-conjugated copper phthalocyanine (CuPc) on surface of TiO2 nanorod arrays (NRs). The photocurrent density of the elegant TiO2@CuPc NRs photoanode reaches 2.40 mA/cm2 at 1.23 V vs. RHE under the illumination of 100 mW/cm2 from AM 1.5G sun simulator, which is 2.4 times higher than that of the pure TiO2. At the same time, the photoelectrochemical device constructed through this strategy has good stability and the photocurrent density remain almost no decline after 8 h of continuous operation. The Mott-Schottky and LSV curves demonstrate that CuPc act as a co-catalyst for water oxidation and a possible mechanism is proposed for water oxidation based on careful analysis of the detailed results. The holes from VB of TiO2 photogenerated by electrons exciting are consumed by a process in which Cu2+ is oxidized to Cu3+ and Cu4+, and then oxidize water to produce oxygen. CuPc species is considered to be a fast redox mediator to reduce the activation energy of water oxidation in and effectively promote charge separation.
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Affiliation(s)
- Yuangang Li
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
- Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Xi'an, China
| | - Mengru Yang
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
| | - Zimin Tian
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
| | - Ningdan Luo
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
| | - Yan Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, China
| | - Haohao Zhang
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
| | - Anning Zhou
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
- Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Xi'an, China
| | - Shanxin Xiong
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, China
- Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Xi'an, China
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21
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Qi K, Li Y, Xie Y, Liu SY, Zheng K, Chen Z, Wang R. Ag Loading Enhanced Photocatalytic Activity of g-C 3N 4 Porous Nanosheets for Decomposition of Organic Pollutants. Front Chem 2019; 7:91. [PMID: 31001509 PMCID: PMC6454074 DOI: 10.3389/fchem.2019.00091] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 02/04/2019] [Indexed: 12/02/2022] Open
Abstract
The g-C3N4 porous nanosheets with different loading amount of Ag nanoparticles (NPs) are successfully prepared by a simple liquid-phase reduction method. These Ag/g-C3N4 composites have an improved photocatalytic performance for decomposing organic pollutants compared with that of pure g-C3N4 nanosheets. Many measurements have been used for characterizing the samples, such as XRD, FTIR, UV-Vis DRS, PL, XPS, EDS, SEM, and TEM. In Ag/g-C3N4, the Ag NPs are uniformly coated on the g-C3N4 surface, the diameter is mainly in the range of 8~18 nanometers. Loading of Ag NPs expand the response to the visible light for g-C3N4 and increasing the producing rate of photogenerated e--h+ pairs. The loading of silver NPs obviously enhances the photocatalytic activity of C3N4 nanosheets toward the Rhodamine B (RhB) decomposition under the simulated sunlight irradiation. With different loading amounts of Ag NPs, Ag/g-C3N4 (3 wt% of Ag) showed the highest photocatalytic activity for RhB decomposition among these as-prepared samples, which is 10 times of the rate of pure C3N4. Based on the experimental results, a possible photocatalytic mechanism for Ag/g-C3N4 is proposed.
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Affiliation(s)
- Kezhen Qi
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, China
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, China
| | - Yi Li
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, China
| | - Yubo Xie
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, China
| | - Shu-yuan Liu
- Department of pharmacology, Shenyang Medical College, Shenyang, China
| | - Kun Zheng
- Department of Hydrogen Energy, Faculty of Energy and Fuels, AGH University of Science and Technology, Kraków, Poland
| | - Zhe Chen
- School of Material Science and Technology, Jilin Institute of Chemical Technology, Jilin City, China
| | - Ruidan Wang
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, China
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22
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Mei Q, Zhang F, Wang N, Yang Y, Wu R, Wang W. TiO2/Fe2O3 heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation. RSC Adv 2019; 9:22764-22771. [PMID: 35519488 PMCID: PMC9067145 DOI: 10.1039/c9ra03531a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 07/13/2019] [Indexed: 12/29/2022] Open
Abstract
We report a study on the synthesis of TiO2/Fe2O3 (TF) nanocomposites and their photocatalytic performance under visible-light irradiation. The characterization of structure and morphology shows that hematite Fe2O3 was deposited on anatase TiO2 nanoparticles with particle sizes in the range of 20–100 nm. In contrast to pure TiO2 and pure Fe2O3, the nanocomposites exhibited remarkable photocatalytic activity. For example, the photoreduction efficiency of TF0.5 reaches 100% for a 100 ppm Cr(vi) solution within 160 minutes. The photochemical properties were studied by various methods. Finally, we conclude that the excellent performance of the photocatalysts is mainly attributed to two aspects: the enhanced absorption of visible light and the synergistic effect of an internal electric field at the heterojunction and citric acid for promoting the separation of electron–hole pairs. A TiO2/Fe2O3 heterojunction with an internal electric field was constructed for enhancing photocatalytic reduction efficiency of Cr(vi).![]()
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Affiliation(s)
- Qiufeng Mei
- Key Laboratory of Oil & Gas Fine Chemicals
- College of Chemistry and Chemical Engineering of Xinjiang University
- Urumqi 830046
- China
| | - Feiyan Zhang
- Key Laboratory of Oil & Gas Fine Chemicals
- College of Chemistry and Chemical Engineering of Xinjiang University
- Urumqi 830046
- China
| | - Ning Wang
- Key Laboratory of Oil & Gas Fine Chemicals
- College of Chemistry and Chemical Engineering of Xinjiang University
- Urumqi 830046
- China
| | - Yun Yang
- Nanomaterials and Chemistry Key Laboratory
- Wenzhou University
- Wenzhou 325027
- China
| | - Ronglan Wu
- Key Laboratory of Oil & Gas Fine Chemicals
- College of Chemistry and Chemical Engineering of Xinjiang University
- Urumqi 830046
- China
| | - Wei Wang
- Department of Chemistry and Center for Pharmacy
- University of Bergen
- Bergen 5020
- Norway
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