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Qiao XX, Xu YH, Liu XJ, Chen SL, Zhong Z, Li YF, Lü J. Nitrogen-doped titanium dioxide/schwertmannite nanocomposites as heterogeneous photo-Fenton catalysts with enhanced efficiency for the degradation of bisphenol A. J Environ Sci (China) 2024; 143:1-11. [PMID: 38644008 DOI: 10.1016/j.jes.2023.06.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 04/23/2024]
Abstract
Potential health risks related to environmental endocrine disruptors (EEDs) have aroused research hotspots at the forefront of water treatment technologies. Herein, nitrogen-doped titanium dioxide/schwertmannite nanocomposites (N-TiO2/SCH) have been successfully developed as heterogeneous catalysts for the degradation of typical EEDs via photo-Fenton processes. Due to the sustainable Fe(III)/Fe(II) conversion induced by photoelectrons, as-prepared N-TiO2/SCH nanocomposites exhibit much enhanced efficiency for the degradation of bisphenol A (BPA; ca. 100% within 60 min under visible irradiation) in a wide pH range of 3.0-7.8, which is significantly higher than that of the pristine schwertmannite (ca. 74.5%) or N-TiO2 (ca. 10.8%). In this photo-Fenton system, the efficient degradation of BPA is mainly attributed to the oxidation by hydroxyl radical (•OH) and singlet oxygen (1O2). Moreover, the possible catalytic mechanisms and reaction pathway of BPA degradation are systematically investigated based on analytical and photoelectrochemical analyses. This work not only provides a feasible means for the development of novel heterogeneous photo-Fenton catalysts, but also lays a theoretical foundation for the potential application of mineral-based materials in wastewater treatment.
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Affiliation(s)
- Xing-Xing Qiao
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yu-Hang Xu
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xiang-Ji Liu
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Sai-Le Chen
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zhou Zhong
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Ya-Feng Li
- State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, China
| | - Jian Lü
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China; State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, China.
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2
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Zhang Z, Cui Z, Xu Y, Ghazzal MN, Colbeau-Justin C, Pan D, Wu W. A Facile Strategy for the Preparation of N-Doped TiO 2 with Oxygen Vacancy via the Annealing Treatment with Urea. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:818. [PMID: 38786775 PMCID: PMC11123904 DOI: 10.3390/nano14100818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 04/29/2024] [Accepted: 05/02/2024] [Indexed: 05/25/2024]
Abstract
Although titanium dioxide (TiO2) has a wide range of potential applications, the photocatalytic performance of TiO2 is limited by both its limited photoresponse range and fast recombination of the photogenerated charge carriers. In this work, the preparation of nitrogen (N)-doped TiO2 accompanied by the introduction of oxygen vacancy (Vo) has been achieved via a facile annealing treatment with urea as the N source. During the annealing treatment, the presence of urea not only realizes the N-doping of TiO2 but also creates Vo in N-doped TiO2 (N-TiO2), which is also suitable for commercial TiO2 (P25). Unexpectedly, the annealing treatment-induced decrease in the specific surface area of N-TiO2 is inhibited by the N-doping and, thus, more active sites are maintained. Therefore, both the N-doping and formation of Vo as well as the increased active sites contribute to the excellent photocatalytic performance of N-TiO2 under visible light irradiation. Our work offers a facile strategy for the preparation of N-TiO2 with Vo via the annealing treatment with urea.
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Affiliation(s)
- Zhe Zhang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Zhenpeng Cui
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China
| | - Yinghao Xu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | | | | | - Duoqiang Pan
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China
| | - Wangsuo Wu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
- Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China
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Nelson K, Mecha AC, Kumar A. Characterization of novel solar based nitrogen doped titanium dioxide photocatalytic membrane for wastewater treatment. Heliyon 2024; 10:e29806. [PMID: 38681563 PMCID: PMC11046203 DOI: 10.1016/j.heliyon.2024.e29806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 03/16/2024] [Accepted: 04/15/2024] [Indexed: 05/01/2024] Open
Abstract
The increasing presence of microbial and emerging organic contaminants pose detrimental effects on the environment and ecosystem such as diseases, pandemics and toxicity. Most of these synthetic pollutants are biorecalcitrant and therefore persist in the environment. Conventional water treatment methods are not effective thereby necessitating the development of advanced techniques such as photocatalysis and membrane processes. In this study, visible light-driven photocatalytic membrane was synthesized through the immobilization of nitrogen-doped nanoparticles onto the polyvinylidene fluoride (PVDF) membrane and performance evaluated with E.coli microbial contaminant removal. Characterization was done using Fourier transform infrared spectra, X-ray diffraction (XRD), water contact angle, Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX). The Nitrogen-doping of titanium dioxide red-shifted the light absorption to a visible range of 440 nm from 400 nm. Nitrogen dopant was detected at 1420 cm-1and 1170 cm-1 for nitrogen doped nanoparticles and 1346-1417 cm-1 for nitrogen doped titanium dioxide PVDF membrane. SEM-EDX confirmed presences of nitrogen in nitrogen doped titanium dioxide nanoparticles on membrane surface with nitrogen elemental composition of 0.01 % wt. The water contact angle reduced by 81.39o from 120.14o to 38.75o because of PVA immobilization of nitrogen-doped titanium dioxide and glutaraldehyde crosslinking. Nitrogen doping resulted in visible light active photocatalytic membranes with better hydrophilicity and fouling resistance. 8.42 E.coli log removal and a relative flux of 0.35 was obtained within 75 min. The developed photocatalytic membrane enables the use of sunlight hence a less costly method for decontamination of wastewater.
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Affiliation(s)
- Kipchumba Nelson
- Renewable Energy, Nanomaterials, and Water Research Group, Department of Chemical and Process Engineering, Moi University, P.O. Box 3900, Eldoret, Kenya
| | - Achisa C. Mecha
- Renewable Energy, Nanomaterials, and Water Research Group, Department of Chemical and Process Engineering, Moi University, P.O. Box 3900, Eldoret, Kenya
- Department of Environmental Science, University of Arizona, USA
| | - Anil Kumar
- Department of Chemical and Process Engineering, Moi University, P.O. Box 3900, Eldoret, Kenya
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Hoang PH, Nguyen MT, Phan KS, Bui HG, Le TTH, Chu NH, Ho NA, Pham QH, Tran XK, Ha PT. Multilayer immobilizing of denitrifying Bacillus sp. and TiO 2-AgNPs on floating expanded clay carrier for co-treatment of nitrite and pathogens in aquaculture. RSC Adv 2024; 14:1984-1994. [PMID: 38196911 PMCID: PMC10774862 DOI: 10.1039/d3ra07361k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 12/11/2023] [Indexed: 01/11/2024] Open
Abstract
Nitrite contamination and the spread of pathogens can seriously degrade water quality. To simultaneously control these factors, an innovative approach of fabricating a remediation agent that contained denitrifying bacteria and TiO2-AgNPs co-immobilized on floating expanded clay (EC) was proposed in this study. The EC was fabricated from a mixture of clay and rice husk through pyrolysis at a high temperature of 1200 °C, followed by a rapid cooling step to create a porous structure for the material. TiO2NPs were modified with Ag to shift the absorbance threshold of TiO2-AgNPs into the visible region of 700-800 nm. The experimental results showed that the stirring speed of 250 rpm was suitable for immobilizing TiO2-AgNPs on EC and achieved the highest Ti and Ag content of 639.38 ± 3.04 and 200.51 ± 3.71 ppm, respectively. Coating TiO2-Ag/EC with chitosan (0.5%) significantly reduced the detachment level of immobilized TiO2-AgNPs compared to that of the material with no coating. In particular, this functionalized material inhibited 99.93 ± 0.1% of Vibrio parahaemolyticus pathogen but did not adversely affect the denitrifying bacteria after 2 h of visible light irradiation. Based on the electrostatic bond between oppositely charged polymers, the denitrifying bacteria, Bacillus sp., in alginate solution was successfully immobilized on the chitosan-coated TiO2-Ag/EC with a bacteria density of (76.67 ± 9.43) × 107 CFU g-1, retaining its nitrite removal efficiency at 99.0 ± 0.27% through six treatment cycles. These findings provide solid evidence for further investigating the combination of biodegradation and photodegradation in wastewater treatment.
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Affiliation(s)
- Phuong Ha Hoang
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Minh Thi Nguyen
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Ke Son Phan
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Materials Science, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Huong Giang Bui
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Thi Thu Huong Le
- Vietnam National University of Agriculture Trau Quy, Gia Lam District Hanoi 100000 Vietnam
| | - Nhat Huy Chu
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Ngoc Anh Ho
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Quang Huy Pham
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Xuan Khoi Tran
- Institute of Biotechnology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
| | - Phuong Thu Ha
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
- Institute of Materials Science, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road, Cau Giay District Hanoi 100000 Vietnam
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5
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Jiang A, Chen X, Xu Y, Shah KJ, You Z. One-step hydrothermal generation of oxygen-deficient N-doped blue TiO 2-Ti 3C 2 for degradation of pollutants and antibacterial properties. ENVIRONMENTAL RESEARCH 2023; 235:116657. [PMID: 37451579 DOI: 10.1016/j.envres.2023.116657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 07/02/2023] [Accepted: 07/11/2023] [Indexed: 07/18/2023]
Abstract
In this study, TiO2 was generated in situ on the surface of Ti3C2 by a hydrothermal process, and urea was added to form N-doped TiO2-Ti3C2. The surface morphology and functional group properties of the prepared materials were analyzed by SEM, TEM, XRD, XPS, etc. The results showed that anatase TiO2 formed on the surface of the Ti3C2 monolayer. Nitrogen-doped nanomaterials show good phenol degradation and good recyclability under visible light. At a urea content of 0.5 g, the photocatalytic degradation of phenol under visible light is best, reaching 88.9% in 3 h, with ·OH and ·O2- holes playing the leading role. However, at lower pH and higher ion concentration, the degradability of N-TiO2-Ti3C2 for phenol is reduced. Furthermore, the material prepared in this work is a two-dimensional layered material, and the adsorption of phenol best fits the Langmuir adsorption isotherm model and the pseudo-second-order kinetic equation. In terms of the antibacterial performance of the material, the N-doped TiO2-Ti3C2 nanomaterial made with 0.2 g of urea has an Escherichia coli scavenging efficiency of about 97.86%, which is an excellent antibacterial material. This study shows that the N-TiO2-Ti3C2 produced in this experiment can be used for environmental applications.
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Affiliation(s)
- Angrui Jiang
- College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China; Yangtze River Innovation Center for Ecological Civilization, Nanjing, 211800, China.
| | - Xi Chen
- College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China; Yangtze River Innovation Center for Ecological Civilization, Nanjing, 211800, China.
| | - Yuchen Xu
- College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China; Yangtze River Innovation Center for Ecological Civilization, Nanjing, 211800, China.
| | - Kinjal J Shah
- College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China.
| | - Zhaoyang You
- College of Urban Construction, Nanjing Tech University, Nanjing, 211800, China.
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Utami M, Wang S, Musawwa MM, Mafruhah L, Fitri M, Wijaya K, Davidraj J, Abd-Elkader OH, Yadav KK, Ravindran B, Chung W, Chang SW, Munusamy-Ramanujam G. Photocatalytic degradation of naphthol blue from Batik waste using functionalized TiO 2-based composites. CHEMOSPHERE 2023:139224. [PMID: 37336442 DOI: 10.1016/j.chemosphere.2023.139224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/25/2023] [Accepted: 06/13/2023] [Indexed: 06/21/2023]
Abstract
This work provides a first-time comparative study examining the photocatalytic activity of functionalized TiO2-based composites to eliminate naphthol blue in Batik wastewater. Reduced graphene oxide (RGO) was synthesized by oxidizing solid graphite using the Hummers' method followed by sonication and reduction. N-doped TiO2 (N-TiO2) was synthesized from titanium tetrachloride (TiCl4) and urea (CH₄N₂O) precursors by the sol-gel method. N-TiO2 modified RGO (RGO/NT) was synthesized using a hydrothermal method from N-TiO2 and RGO. Prepared TiO2-based composites and commercial TiO2, for comparison were characterized using Fourier transform infrared spectrometer (FTIR), X-Ray diffractometer (XRD), scanning electron microscope-energy dispersive X-ray (SEM-EDX), and UV-Vis diffuse reflectance spectrometer (UV-Vis DRS). FTIR characterization indicated Ti-N bonding in N-TiO2 and RGO/NT. XRD patterns showed that commercial TiO2 had a rutile phase, while N-TiO2 and RGO/NT had an anatase phase with crystal sizes of 30.09, 16.28, and 12.02 nm, respectively. SEM results displayed the presence of small and glossy white N-TiO2 dispersed on the surface of RGO. Characterization using UV-Vis DRS showed that the band gap energy values for TiO2, N-TiO2, and RGO/NT were 3.25, 3.12, and 3.08 eV with absorption regions at the wavelengths of 382, 398, and 403 nm, respectively. The highest photocatalytic activity for RGO/NT for degrading naphthol blue was obtained at pH 5, with a photocatalyst mass of 60 mg, and an irradation of 15 min. Photocatalytic degradation by RGO/NT on Batik wastewater under visible light showed higher effectivity than under UV light.
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Affiliation(s)
- Maisari Utami
- Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia.
| | - Shaobin Wang
- School of Chemical Engineering and Advanced Materials, University of Adelaide, Adelaide SA 5005, Australia
| | - Muhammad Miqdam Musawwa
- Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia
| | - Lulu' Mafruhah
- Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia
| | - Melinda Fitri
- Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia
| | - Karna Wijaya
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | | | - Omar H Abd-Elkader
- Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Krishna Kumar Yadav
- Faculty of Science and Technology, Madhyanchal Professional University, Ratibad, Bhopal, 462044, India
| | - Balasubramani Ravindran
- Department of Environmental Energy & Engineering, Kyonggi University, Suwon-si, Gyeonggi-do,16227, South Korea.
| | - Woojin Chung
- Department of Environmental Energy & Engineering, Kyonggi University, Suwon-si, Gyeonggi-do,16227, South Korea
| | - Soon Woong Chang
- Department of Environmental Energy & Engineering, Kyonggi University, Suwon-si, Gyeonggi-do,16227, South Korea
| | - Ganesh Munusamy-Ramanujam
- Molecular Biology and Immunobiology Division, Interdisciplinary Ins Titute of Indian System of Medicine, SRM-IST, Kattankulathur, Tamil Nadu 603203, India.
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7
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Mahmoudi A, Tavakoly Sany SB, Ahari Salmasi M, Bakhshi A, Bustan A, Heydari S, Rezayi M, Gheybi F. Application of nanotechnology in air purifiers as a viable approach to protect against Corona virus. IET Nanobiotechnol 2023. [PMID: 37096564 DOI: 10.1049/nbt2.12132] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 03/18/2023] [Accepted: 03/22/2023] [Indexed: 04/26/2023] Open
Abstract
The outbreak of COVID-19 disease, the cause of severe acute respiratory syndrome, is considered a worldwide public health concern. Although studies indicated that the virus could spread through respiratory particles or droplets in close contact, current research have revealed that the virus stays viable in aerosols for several hours. Numerous investigations have highlighted the protective role of air purifiers in the management of COVID-19 transmission, however, there are still some doubts regarding the efficiency and safety of these technologies. According to those observations, using a proper ventilation system can extensively decrease the spread of COVID-19. However, most of those strategies are currently in the experimental stages. This review aimed at summarising the safety and effectiveness of the recent approaches in this field including using nanofibres that prevent the spread of airborne viruses like SARS-CoV-2. Here, the efficacy of controlling COVID-19 by means of combining multiple strategies is comprehensively discussed.
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Affiliation(s)
- Ali Mahmoudi
- Department of Medical Biotechnology and Nanotechnology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Abadan University of Medical Sciences, Abadan, Iran
| | - Seyedeh Belin Tavakoly Sany
- Department of Health Education and Health Promotion, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Marzieh Ahari Salmasi
- Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
| | - Ali Bakhshi
- School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
| | - Arad Bustan
- Department of Medical Biotechnology and Nanotechnology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Sahar Heydari
- Department of Physiology and Pharmacology, Faculty of Medicine, Sabzevar University of Medical Sciences, Mashhad, Iran
| | - Majid Rezayi
- Department of Medical Biotechnology and Nanotechnology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Fatemeh Gheybi
- Department of Medical Biotechnology and Nanotechnology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Nanotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
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8
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Rahman KH, Kar AK, Chen KC, Chen CJ. Highly effective Fe-doped TiO 2nanoparticles for removal of toxic organic dyes under visible light illumination. NANOTECHNOLOGY 2023; 34:245707. [PMID: 36917852 DOI: 10.1088/1361-6528/acc407] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 03/14/2023] [Indexed: 06/18/2023]
Abstract
This article addresses the synthesis of Fe3+doped TiO2nanoparticles with variations of molar concentrations of Fe3+and their adequate use as potential photocatalysts for Photocatalysis applications. Synthesized photocatalysts were characterized thoroughly by different analytical techniques in terms of morphological, chemical, structural, crystalline, optical, electronic structure, surface area etc properties. The occurrence of red shift phenomenon of the energy band gap attributes to the transfer of charges and transition between the d electrons of dopant and conduction band (CB) or valence band (VB) of TiO2. The doping of Fe3+ions generates more trap sites for charge carriers with the surface trap sites. Thorough experimental conclusions revealed that the Fe3+ions necessarily regulate the catalytic property of TiO2nanomaterial. The obtained total degradation efficiency rate of Methylene Blue (MB) was 93.3% in the presence of 0.1 M Fe3+in the host material and for Malachite Green Oxalate the efficiency was 100% in the presence of 0.05 M and 0.1 M Fe3+in the host material. In both the cases the total visible light irradiation time was 90 min. The adsorption properties of the photocatalysts have been also performed in a dark for 90 min in the presence of MB dye. However, till now there are hardly reported photocatalysts which shows complete degradation of these toxic organic dyes by visible light driven photocatalysis. of potential values of valence and conduction band shows the production of active oxidizing species for hydrogen yield and the possible mechanism of the Schottky barrier has been proposed. A schematic diagram of visible light driven Photocatalysis has been pictured showing degradation activity of Fe3+-TiO2catalysts sample.
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Affiliation(s)
- Kazi Hasibur Rahman
- Micro and Nanoscience Lab, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, Jharkhand, India
| | - Asit Kumar Kar
- Micro and Nanoscience Lab, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, Jharkhand, India
| | - Kuan-Chung Chen
- Department of Environmental Science & Engineering, National Pingtung University of Science and Technology, Taiwan
| | - Ching-Jung Chen
- Department of Environmental Science & Engineering, National Pingtung University of Science and Technology, Taiwan
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9
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Xiong Z, Liu J, Guo F, Du Y, Zhou F, Yang Q, Lu W, Shi H. Influence of nonmetallic elements doping on the NH3-SCR activity and properties of Ce20W10Ti100O catalyst via melamine modification. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2023.123879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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10
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Adassooriya NM, Ozgit D, Shivareddy SG, Hiralal P, Dahanayake D, Oliver RA, Amaratunga GAJ. Dielectric behaviour of plasma hydrogenated TiO 2/cyanoethylated cellulose nanocomposites. NANOSCALE 2023; 15:1824-1834. [PMID: 36602164 DOI: 10.1039/d2nr04680f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The interface between the polymer and nanoparticle has a vital role in determining the overall dielectric properties of a dielectric polymer nanocomposite. In this study, a novel dielectric nanocomposite containing a high permittivity polymer, cyanoethylated cellulose (CRS) and TiO2 nanoparticles surface modified by hydrogen plasma treatments was successfully prepared with different weight percentages (10%, 20% and 30%) of hydrogenated TiO2. Internal structure of H plasma treated TiO2 nanoparticles (H-TiO2) and the intermolecular interactions and morphology within the polymer nanocomposites were analysed. H-TiO2/CRS thin films on SiO2/Si wafers were used to form metal-insulator-metal (MIM) type capacitors. Capacitances and loss factors in the frequency range of 1 kHz to 1 MHz were measured. At 1 kHz H-TiO2/CRS nanocomposites exhibited ultra-high dielectric constants of 80, 118 and 131 for nanocomposites with 10%, 20% and 30% weight of hydrogenated TiO2 respectively, significantly higher than values of pure CRS (21) and TiO2 (41). Furthermore, all three H-TiO2 /CRS nanocomposites show a loss factor <0.3 at 1 kHz and low leakage current densities (10-6 A cm-2-10-7 A cm-2). Leakage was studied using conductive atomic force microscopy (C-AFM) and it was observed that the leakage is associated with H-TiO2 nanoparticles embedded in the CRS polymer matrix. Although, modified interface slightly reduces energy densities compared to pristine TiO2/CRS system, the capacitance values for H-TiO2/CRS-in the voltage range of -2 V to 2 V are very stable. Whilst H-TiO2/CRS possesses ultra-high dielectric constants (>100), this study reveals that the polymer nanoparticle interface has a potential influence on dielectric behaviour of the composite.
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Affiliation(s)
- Nadeesh M Adassooriya
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, UK.
| | - Dilek Ozgit
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, UK.
| | - Sai G Shivareddy
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, UK.
| | - Pritesh Hiralal
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, UK.
| | - Damayanthi Dahanayake
- Sri Lanka Institute of Nanotechnology (SLINTEC), Mahenawatta, Pitipana, Homagama, CO 10206, Sri Lanka
| | - Rachel A Oliver
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
| | - Gehan A J Amaratunga
- Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, UK.
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11
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Effect of Calcination Temperature of SiO2/TiO2 Photocatalysts on UV-VIS and VIS Removal Efficiency of Color Contaminants. Catalysts 2023. [DOI: 10.3390/catal13010186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
This paper presents the effect of fumed silica modification and calcination temperature on the physicochemical properties of photocatalysts and their activity under the UV-VIS and VIS light range. The materials were obtained by hydrolysis of titanium tetraisopropoxide (TTIP) combined with a calcination step. The obtained nanomaterials were characterized using analytical methods such as X-ray diffraction XRD, FT-IR/DRS infrared spectroscopy, UV-Vis/DRS spectroscopy and SEM scanning electron microscopy. BET specific surface area and zeta potential were also measured. It was observed that SiO2 modification inhibited the transformation phase of anatase to rutile and the increase in crystallite size during calcination. The calcination process contributed to a change in the surface character of photocatalysts under study from positively to negatively charged. The photocatalytic activity of samples was identified by determining the methylene blue decomposition under UV-VIS and VIS light. Experimental results showed that the addition of SiO2 and the calcination process increased the photoactivity. The obtained materials showed higher activity compared to the reference samples. It was found that the degree of dye removal increased along with increased calcination temperature. The highest activity was observed for photocatalyst SiO2(11.1%)/TiO2_600.
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Wang S, Zhang Y. Degradation of methylene blue by an E-Fenton process coupled with peroxymonosulfate via free radical and non-radical oxidation pathways. NEW J CHEM 2023. [DOI: 10.1039/d2nj05504j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This paper reports a combined advanced oxidation process to degrade methylene blue and investigates its oxidation mechanism and degradation pathway.
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Affiliation(s)
- Song Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Yonggang Zhang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China
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13
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Liu F, Cao H, Xu L, Fu H, Sun S, Xiao Z, Sun C, Long X, Xia Y, Wang S. Design and preparation of highly active TiO 2 photocatalysts by modulating their band structure. J Colloid Interface Sci 2023; 629:336-344. [PMID: 36162391 DOI: 10.1016/j.jcis.2022.09.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 08/24/2022] [Accepted: 09/04/2022] [Indexed: 10/14/2022]
Abstract
Titanium dioxide photocatalysts with high reduction potential and visible light response hold great promise in photochemical conversion. Here, we used a simple glycine doping method to synthesize novel N-TiO2@C photocatalysts with upward shifted conduction bands and narrowed band gaps as well as inhibited recombination of photoinduced electron-hole pairs. The N-TiO2@C photocatalysts exhibited higher visible light response and remarkably enhanced photocatalytic activity in the production of nicotinamide adenine dinucleotide (NADH) by photomediated reduction of NAD+ without any electron mediator. The yield of NADH was up to 70.3 % far greater than that of the undoped TiO2 (11.3 %), and it stabilized at ca. 60 % after 10 cycles. The viability of coupling NADH regeneration with enzymatic reaction (alcohol dehydrogenase) was established in aldehyde reduction where formaldehyde was specifically reduced to methanol. These findings shed new light on the modulation of the band structure of semiconductors and develop an electron mediator free strategy for NADH-dependent artificial photosynthesis through coupled photocatalytic and enzymatic approaches.
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Affiliation(s)
- Fangyuan Liu
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Han Cao
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Luyi Xu
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Hui Fu
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Shiyong Sun
- School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
| | - Zijun Xiao
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Caiheng Sun
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Xing Long
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Yongqing Xia
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China
| | - Shengjie Wang
- College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266580, China.
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Kovalevskiy N, Svintsitskiy D, Cherepanova S, Yakushkin S, Martyanov O, Selishcheva S, Gribov E, Kozlov D, Selishchev D. Visible-Light-Active N-Doped TiO 2 Photocatalysts: Synthesis from TiOSO 4, Characterization, and Enhancement of Stability Via Surface Modification. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12234146. [PMID: 36500767 PMCID: PMC9739126 DOI: 10.3390/nano12234146] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 11/18/2022] [Accepted: 11/21/2022] [Indexed: 05/13/2023]
Abstract
This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO2 through calcination in air at an increased temperature. The as-prepared N-doped TiO2 provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO2 correlates to its absorption spectrum. The key role of paramagnetic nitrogen species in the absorption of visible light and in the visible-light-activity of N-doped TiO2 is shown using the EPR technique. Surface modification of N-doped TiO2 with copper species prevents its intense deactivation under highly powerful radiation and results in a nanocomposite photocatalyst with enhanced activity and stability. The photocatalysts prepared under different conditions are discussed regarding the effects of their characteristics on photocatalytic activity under UV and visible light.
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Affiliation(s)
- Nikita Kovalevskiy
- Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | - Dmitry Svintsitskiy
- Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | - Svetlana Cherepanova
- Department of Heterogeneous Catalysis, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | - Stanislav Yakushkin
- Department of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | - Oleg Martyanov
- Department of Physicochemical Methods of Research, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | | | - Evgeny Gribov
- Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | - Denis Kozlov
- Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
| | - Dmitry Selishchev
- Department of Unconventional Catalytic Processes, Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
- Correspondence: ; Tel.: +73-8-3326-9429
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Ferrara V, Marchetti M, Alfieri D, Targetti L, Scopelliti M, Pignataro B, Pavone F, Vetri V, Sancataldo G. Blue Light Activated Photodegradation of Biomacromolecules by N-doped Titanium Dioxide in a Chitosan Hydrogel Matrix. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Electronic Structure, Optical and Magnetic Properties of Oxygen-Deficient Gray TiO2–δ(B). INORGANICS 2022. [DOI: 10.3390/inorganics10110184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The gray-colored oxygen-deficient TiO2–δ(B) nanobelts have been synthesized through a combination of the hydrothermal method followed by an ion exchange process and vacuum annealing. Electron paramagnetic resonance reveals an existence of F-centers in the form of electron-trapped oxygen vacancies within the anionic sublattice of the gray bronze TiO2 that induces its colouration. The diffuse reflectance spectroscopy showed that the formation of oxygen vacancies into TiO2(B) significantly increases its absorption intensity in both visible and near infrared ranges. The band gap of TiO2(B) with anionic defects is equal to 3.03 eV (against 3.24 eV for white TiO2(B) treated in air). Room temperature ferromagnetism associated with the defects was detected in gray TiO2–δ(B), thus indicating it belongs it to the class of dilute magnetic oxide semiconductors. It was found that in the low-temperature range (4 K), the magnetic properties of vacuum annealed TiO2(B) do not differ from those for TiO2(B) treated in air. We hope that the findings are defined here make a contribution to further progress in fabrication and manufacturing of defective TiO2-based nanomaterials for catalysis, magnetic applications, batteries, etc.
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Li G, Mang C, Xing L, Cao P, Cai Y, Luo J, Jiang H. Surfactant-assisted synthesis of Mo-doped TiO2/FAC (fly ash cenosphere) for degradation of methylene blue dye under visible light irradiation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Abutalib M, Alghamdi HM, Rajeh A, Nur O, Hezma A, Mannaa MA. Fe3O4/Co3O4–TiO2 S-scheme photocatalyst for degradation of organic pollutants and H2 production under natural sunlight. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY 2022; 20:1043-1056. [DOI: 10.1016/j.jmrt.2022.07.078] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
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19
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Plasmon-Enhanced Efficiency of DSSC and Hybrid Nano Catalysis Applications. Top Catal 2022. [DOI: 10.1007/s11244-022-01678-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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20
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Shimasaki Y, Matsuno T, Guo Q, Shimojima A, Wada H, Mori T, Kuroda K. Preparation of mesoporous nitrogen-doped titania comprising large crystallites with low thermal conductivity. NANOSCALE ADVANCES 2022; 4:2509-2520. [PMID: 36134133 PMCID: PMC9417602 DOI: 10.1039/d2na00083k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 05/08/2022] [Indexed: 06/16/2023]
Abstract
Reducing the thermal conductivity (κ) of mesoporous N-doped titania (TiO2) is crucial for the development of TiO2-based materials that exhibit excellent electronic, photochemical, and thermoelectric properties. Mesopores can contribute to the reduction of κ via phonon scattering, and the scattering effect due to the randomness of crystal interfaces should be significantly reduced to clarify the role of mesopores in reducing thermal conductivity. Highly ordered mesoporous N-doped TiO2 comprising large crystallites was prepared with silica colloidal crystals as a template into which a Ti source was introduced, followed by calcination with urea. N-doped samples comprising large crystallites exhibiting random mesopores were also prepared and used for the investigation of the effects of the shape and arrangement of the mesopore on phonon scattering. The mesostructures of the two separately prepared N-doped TiO2 samples were retained after sintering at 873 K and 80 MPa to fabricate pellets. Furthermore, the effective suppression of the long mean-free-path phonon conduction by the thin pore walls at a nanometer scale thickness significantly reduced the thermal conductivities of both samples. The presence of ordered mesopores further contributed to the reduction of κ, which was probably due to the enhanced contribution of the backscattering of phonons caused by ordered pore wall surfaces.
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Affiliation(s)
- Yuta Shimasaki
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan
| | - Takamichi Matsuno
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan
| | - Quansheng Guo
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
| | - Atsushi Shimojima
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan
- Kagami Memorial Research Institute for Materials Science and Technology, Waseda University 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
| | - Hiroaki Wada
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan
- Kagami Memorial Research Institute for Materials Science and Technology, Waseda University 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
| | - Takao Mori
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8577 Japan
| | - Kazuyuki Kuroda
- Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University 3-4-1 Okubo, Shinjuku-ku Tokyo 169-8555 Japan
- Kagami Memorial Research Institute for Materials Science and Technology, Waseda University 2-8-26 Nishiwaseda, Shinjuku-ku Tokyo 169-0051 Japan
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21
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Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO2. CRYSTALS 2022. [DOI: 10.3390/cryst12060778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Narrowing the band gap and increasing the photodegradation efficiency of TiO2-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally ordered macroporous Pt-loaded TiO2 photocatalyst (3DOM Pt/TiO2) has been successfully synthesized using a facile colloidal crystal-template method. The resultant composite combines several morphological/structural advantages, including uniform 3D ordered macroporous skeletons, high crystallinity, large porosity and an internal electric field formed at Pt/TiO2 interfaces. These unique features enable the 3DOM Pt/TiO2 to possess a large surface for photocatalytic reactions and fast diffusion for mass transfer of reactants as well as efficient suppression of recombination for photogenerated electron-hole pairs in TiO2. Thus, the 3DOM Pt/TiO2 exhibits significantly enhanced photocatalytic activity. Typically, 88% of RhB can be degraded over the 3DOM Pt/TiO2 photocatalyst under visible light irradiation (λ ≥ 420 nm) within 100 min, much higher than that of the commercial TiO2 nanoparticles (only 37%). The underlying mechanism for the enhanced photocatalytic activity of 3DOM Pt/TiO2 has been further analyzed based on energy band theory and ascribed to the formation of Schottky-type Pt/TiO2 junctions. The proposed method herein can provide new references for further improving the photocatalytic efficiency of other photocatalysts via rational structural/morphological engineering.
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Photocatalytic Reduction of CO 2 with N-Doped TiO 2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis. NANOMATERIALS 2022; 12:nano12111793. [PMID: 35683653 PMCID: PMC9182572 DOI: 10.3390/nano12111793] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/20/2022] [Accepted: 05/22/2022] [Indexed: 01/28/2023]
Abstract
The objective of this work was to analyze the effect of carbon support on the activity and selectivity of N-doped TiO2 nanoparticles. Thus, N-doped TiO2 and two types of composites, N-doped TiO2/CNT and N-doped TiO2/rGO, were prepared by a new environmentally friendly one-pot method. CNT and rGO were used as supports, triethylamine and urea as N doping agents, and titanium (IV) tetraisopropoxide and ethanol as Ti precursor and hydrolysis agent, respectively. The as-prepared photocatalysts exhibited enhanced photocatalytic performance compared to TiO2 P25 commercial catalyst during the photoreduction of CO2 with water vapor. It was imputed to the synergistic effect of N doping (reduction of semiconductor band gap energy) and carbon support (enlarging e−-h+ recombination time). The activity and selectivity of catalysts varied depending on the investigated material. Thus, whereas N-doped TiO2 nanoparticles led to a gaseous mixture, where CH4 formed the majority compared to CO, N-doped TiO2/CNT and N-doped TiO2/rGO composites almost exclusively generated CO. Regarding the activity of the catalysts, the highest production rates of CO (8 µmol/gTiO2/h) and CH4 (4 µmol/gTiO2/h) were achieved with composite N1/TiO2/rGO and N1/TiO2 nanoparticles, respectively, where superscript represents the ratio mg N/g TiO2. These rates are four times and almost forty times higher than the CO and CH4 production rates observed with commercial TiO2 P25.
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Sanchez Tobon C, Ljubas D, Mandić V, Panžić I, Matijašić G, Ćurković L. Microwave-Assisted Synthesis of N/TiO 2 Nanoparticles for Photocatalysis under Different Irradiation Spectra. NANOMATERIALS 2022; 12:nano12091473. [PMID: 35564182 PMCID: PMC9104789 DOI: 10.3390/nano12091473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/20/2022] [Accepted: 04/22/2022] [Indexed: 12/10/2022]
Abstract
Nitrogen-doped TiO2 (N/TiO2) photocatalyst nanoparticles were derived by the environmentally friendly and cost-effective microwave-assisted synthesis method. The samples were prepared at different reaction parameters (temperature and time) and precursor ratio (amount of nitrogen source; urea). The obtained materials were characterized by X-ray diffraction (XRD), photoelectron spectroscopy (XPS), Raman spectroscopy (RS), infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), electron microscopy (SEM-EDS), and nitrogen adsorption/desorption isotherms. Two cycles of optimizations were conducted to determine the best reaction temperature and time, as well as N content. The phase composition for all N/TiO2 nanomaterials was identified as photoactive anatase. The reaction temperature was found to be the most relevant parameter for the course of the structural evolution of the samples. The nitrogen content was the least relevant for the development of the particle morphology, but it was important for photocatalytic performance. The photocatalytic activity of N/TiO2 nanoparticle aqueous suspensions was evaluated by the degradation of antibiotic ciprofloxacin (CIP) under different irradiation spectra: ultraviolet A light (UVA), simulated solar light, and visible light. As expected, all prepared samples demonstrated efficient CIP degradation. For all irradiation sources, increasing synthesis temperature and increasing nitrogen content further improved the degradation efficiencies.
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Affiliation(s)
- Camilo Sanchez Tobon
- Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
- Correspondence: (C.S.T.); (D.L.); (L.Ć.)
| | - Davor Ljubas
- Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
- Correspondence: (C.S.T.); (D.L.); (L.Ć.)
| | - Vilko Mandić
- Faculty of Chemical Engineering and Technology, University of Zagreb, 10000 Zagreb, Croatia; (V.M.); (I.P.); (G.M.)
| | - Ivana Panžić
- Faculty of Chemical Engineering and Technology, University of Zagreb, 10000 Zagreb, Croatia; (V.M.); (I.P.); (G.M.)
| | - Gordana Matijašić
- Faculty of Chemical Engineering and Technology, University of Zagreb, 10000 Zagreb, Croatia; (V.M.); (I.P.); (G.M.)
| | - Lidija Ćurković
- Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
- Correspondence: (C.S.T.); (D.L.); (L.Ć.)
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Preparing Biomass Carbon Fiber Derived from Waste Rabbit Hair as a Carrier of TiO 2 for Photocatalytic Degradation of Methylene Blue. Polymers (Basel) 2022; 14:polym14081593. [PMID: 35458344 PMCID: PMC9033106 DOI: 10.3390/polym14081593] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/11/2022] [Accepted: 04/12/2022] [Indexed: 12/13/2022] Open
Abstract
In the past few years, biomass carbon materials have gained wide attention from many scholars as TiO2 carrier materials to improve photocatalytic activity due to their renewable, green, low-cost, and high-efficiency advantages. In this study, TiO2/carbonized waste rabbit fibers (TiO2/CRFs) nanocomposites with the hierarchical microporous/mesoporous structure were fabricated by a combination of carbonization, immersion, and calcination methods using tetrabutyl titanate as the titanium source and waste rabbit hair as the carbon source. The properties and catalytic activity of TiO2/CRFs composite were evaluated based on several characterization techniques and methylene blue (MB) photodegradation studies. The results showed that the degradation of MB by TiO2/CRFs could reach 98.1% after 80 min of solar irradiation. Moreover, TiO2/CRFs still maintained high photocatalytic activity after five cycles of degradation tests, exhibiting good stability and reusability. The improved photocatalytic performance of TiO2/CRFs materials is attributed to the natural carbon and nitrogen element doping of TiO2/CRFs and its morphology, which reduces the compounding of photogenerated electron-hole pairs and narrows the TiO2 band gap, while the multiple reflections of visible light in the pore channels enhance the visible light absorption of the materials. Furthermore, the large specific surface area provides abundant reaction sites for adsorbed reactants. This paper provides the experimental basis for the application of waste rabbit biomass carbon composites in photocatalytic degradation field.
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Synergistic Excited State Involved Catalytic Reduction of (NH3-trz)[Fe(dipic)2] Complex by SnO2/TiO2 Nanocomposite. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02304-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Sygletou M, Benedetti S, di Bona A, Canepa M, Bisio F. Doping-Dependent Optical Response of a Hybrid Transparent Conductive Oxide/Plasmonic Medium. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:1881-1889. [PMID: 35145571 PMCID: PMC8819857 DOI: 10.1021/acs.jpcc.1c07567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/11/2022] [Indexed: 06/14/2023]
Abstract
Understanding the interaction between plasmonic nanoparticles and transparent conductive oxides is instrumental to the development of next-generation photovoltaic, optoelectronic, and energy-efficient solid-state lighting devices. We investigated the optical response of hybrid media composed of gold nanoparticles deposited on aluminum-doped zinc oxide thin films with varying doping concentration by spectroscopic ellipsometry. The dielectric functions of bare AZO were addressed first, revealing doping-induced effects such as the band gap shift and the appearance of free carriers. In the hybrid media, a blue-shift of the localized surface plasmon resonance of Au NPs as a function of increasing Al doping of the substrate was observed, ascribed to the occurrence of a charge transfer between the two materials and the doping-dependent variation of the polarizability of the substrate.
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Affiliation(s)
- Maria Sygletou
- OptMatLab,
Dipartimento di Fisica, Università
di Genova, via Dodecaneso 33, I-16146 Genova, Italy
| | | | | | - Maurizio Canepa
- OptMatLab,
Dipartimento di Fisica, Università
di Genova, via Dodecaneso 33, I-16146 Genova, Italy
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Wang W, Liu Y, Yu S, Wen X, Wu D. Highly efficient solar-light-driven photocatalytic degradation of pollutants in petroleum refinery wastewater on hierarchically-structured copper sulfide (CuS) hollow nanocatalysts. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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Bhawna, Kumar S, Sharma R, Gupta A, Tyagi A, Singh P, Kumar A, Kumar V. Recent insights into SnO 2-based engineered nanoparticles for sustainable H 2 generation and remediation of pesticides. NEW J CHEM 2022. [DOI: 10.1039/d1nj05808h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Due to the ongoing industrial revolution and global health pandemics, solar-driven water splitting and pesticide degradation are highly sought to cope with catastrophes such as depleting fossil reservoirs, global warming, and environmental degradation.
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Affiliation(s)
- Bhawna
- Department of Chemistry, Kirori Mal College, University of Delhi, Delhi, India
- Department of Chemistry, University of Delhi, Delhi, India
| | - Sanjeev Kumar
- Department of Chemistry, Kirori Mal College, University of Delhi, Delhi, India
- Department of Chemistry, University of Delhi, Delhi, India
| | - Ritika Sharma
- Department of Biochemistry, University of Delhi, India
| | - Akanksha Gupta
- Department of Chemistry, Sri Venkateswara College, University of Delhi, Delhi, India
| | - Adish Tyagi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Prashant Singh
- Department of Chemistry, Atma Ram Sanatan Dharma College, Delhi University, New Delhi, India
| | - Anup Kumar
- School of Physics, Trinity College Dublin, Ireland
| | - Vinod Kumar
- Special Centre for Nano Sciences, Jawaharlal Nehru University, Delhi, India
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Basumatary B, Basumatary R, Ramchiary A, Konwar D. Evaluation of Ag@TiO 2/WO 3 heterojunction photocatalyst for enhanced photocatalytic activity towards methylene blue degradation. CHEMOSPHERE 2022; 286:131848. [PMID: 34388867 DOI: 10.1016/j.chemosphere.2021.131848] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/29/2021] [Accepted: 08/06/2021] [Indexed: 06/13/2023]
Abstract
Methylene blue is a dye that is extensively used in the textile industry but it is a hazardous, carcinogenic, and mutagenic pollutant. Therefore, the treatment of wastewater containing methylene blue by photocatalytic degradation under visible light without using any sacrificial agent (H2O2) is an important method towards attaining an eco-friendly environment. Herein, the nanocomposite of Ag-doped TiO2 on WO3 nanoparticles (Ag@TiO2/WO3) was prepared by a modified sol-gel precipitation route, and their physicochemical properties were studied. The bandgap of Ag sensitized metal oxide nanocomposite in Ag@TiO2/WO3 was slightly reduced compared to the pristine titania due to the creation of interstitial energy states during colligation of titania and tungsten oxide. The ease of charge carrier transfers through the heterojunction of TiO2/WO3 increased the photocatalytic activity of the photocatalyst. Furthermore, in Ag@TiO2/WO3 the plasmonic Ag sensitization to the host semiconductor TiO2 has further boosted the rate of photocatalytic degradation because of the surface plasmon resonance (SPR) and hindrance of charge carrier recombination. Due to the synergistic effect of SPR and the presence of heterojunction in Ag@TiO2/WO3, the photocatalytic activity was found to be 25 times higher for Ag@TiO2/WO3 than that of commercial DP25 photocatalyst under visible light towards methylene blue degradation.
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Affiliation(s)
- Bablu Basumatary
- Department of Physics, Bodoland University, Rangalikhata, Kokrajhar, Assam, 783370, India; Institute of Advanced Study in Science and Technology, Guwahati, Assam, 781035, India
| | - Rajmoni Basumatary
- Department of Physics, Bodoland University, Rangalikhata, Kokrajhar, Assam, 783370, India
| | - Anjalu Ramchiary
- Department of Physics, Bodoland University, Rangalikhata, Kokrajhar, Assam, 783370, India.
| | - Dimpul Konwar
- Department of Materials Science and Engineering, Gachon University, Bokjung-dong, Seongnam-si, Gyeonggi-do, 1342, Republic of Korea.
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30
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Sabri M, Habibi-Yangjeh A, Rahim Pouran S, Wang C. Titania-activated persulfate for environmental remediation: the-state-of-the-art. CATALYSIS REVIEWS 2021. [DOI: 10.1080/01614940.2021.1996776] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Mina Sabri
- Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Aziz Habibi-Yangjeh
- Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Shima Rahim Pouran
- Social Determinants of Health Research Center, Department of Environmental and Occupational Health, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Chundong Wang
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan PR China
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31
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Mannaa MA, Qasim KF, Alshorifi FT, El-Bahy SM, Salama RS. Role of NiO Nanoparticles in Enhancing Structure Properties of TiO 2 and Its Applications in Photodegradation and Hydrogen Evolution. ACS OMEGA 2021; 6:30386-30400. [PMID: 34805670 PMCID: PMC8600530 DOI: 10.1021/acsomega.1c03693] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 10/22/2021] [Indexed: 06/01/2023]
Abstract
Pure and modified mesoporous TiO2 nanoparticles with different loadings of NiO (3-20.0 wt %) were prepared through the surfactant-assisted sol-gel approach with the use of cetyltrimethylammonium bromide as a template. The optical and structural properties of different samples were examined using N2 adsorption-desorption analysis, energy-dispersive spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence (PL) spectroscopy. X-ray diffraction results confirmed the insertion of Ni2+ into the lattice of TiO2, and the crystallite size reduced remarkably after the addition of NiO. The diffuse reflectance spectroscopy spectra displayed obvious red shift in the absorption edges, and new absorption bands appeared in the visible region when NiO was added, which indicates the formation of surface defects and oxygen vacancies. The optical band gap of TiO2 reduced sharply when the contents of NiO were increased. The increase in the surface defects as well as oxygen vacancies were examined using PL spectroscopy. The photocatalytic performance of the as-synthesized samples was investigated over photodegradation of brilliant green (BG) and phenol and hydrogen generation under visible light. 10% NiO/TiO2 exhibited the highest photocatalytic efficiency. The photocatalytic activity was improved due to the creation of a p-n junction at the interface of NiO/TiO2, which efficiently promotes the separation of photogenerated electron/hole pairs and consequently enhances its photodegradation activity. According to the photocatalytic activity results, NiO contents were considered one of the most important factors affecting the photodegradation of BG and phenol and H2 evolution. Also, we discussed the mechanism of photodegradation, mineralization (total organic carbon), and photocatalytic reaction kinetics of BG and phenol.
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Affiliation(s)
- Mohammed A. Mannaa
- Chemistry
Department, Faculty of Applied Science, Sa’ada University, Sana 31220, Yemen
| | - Khaled F. Qasim
- Chemistry
Department, Faculty of Science, Suez University, Ismailia 41511, Egypt
| | - Fares T. Alshorifi
- Department
of Chemistry, Faculty of Science, Sheba
Region University, Sana 31220, Yemen
- Department
of Chemistry, Faculty of Science, Sana’a
University, Sana 31220, Yemen
| | - Salah M. El-Bahy
- Department
of Chemistry, Turabah University College, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Reda S. Salama
- Basic
Science
Department, Faculty of Engineering, Delta
University for Science and Technology, Gamasa 11152, Egypt
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32
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Construction of Ag3PO4/TiO2/C with p-n heterojunction using Shiff base-Ti complex as precursor: Preparation, performance and mechanism. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.08.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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33
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Fallahnezhad S, Amoozadeh A. Magnetic field‐assisted photochemical oxidation of benzyl alcohol to corresponding aldehydes by introducing
TiO
2
(
P25
)‐
ZnO
/Fe
3+
as a novel nanophotocatalyst. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Saied Fallahnezhad
- Department of Organic Chemistry, Faculty of Chemistry Semnan University Semnan Iran
| | - Ali Amoozadeh
- Department of Organic Chemistry, Faculty of Chemistry Semnan University Semnan Iran
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One-Pot Synthesis of Nitrogen-Doped TiO 2 with Supported Copper Nanocrystalline for Photocatalytic Environment Purification under Household White LED Lamp. Molecules 2021; 26:molecules26206221. [PMID: 34684802 PMCID: PMC8540323 DOI: 10.3390/molecules26206221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 10/03/2021] [Accepted: 10/13/2021] [Indexed: 11/17/2022] Open
Abstract
Developing efficient and cheap photocatalysts that are sensitive to indoor light is promising for the practical application of photocatalysis technology. Here, N-doped TiO2 photocatalyst with loaded Cu crystalline cocatalyst is synthesized by a simple one-pot method. The structure is confirmed by transmission electron microscopy and X-ray photoelectron spectroscopy analysis, which exhibit that Cu metal nanocrystalline is uniformly deposited on the surface of N-doped TiO2 material. UV-Vis absorption spectra illustrate that the modified samples possess favorable visible light absorption properties and suppressed-electron hole separation. The as-fabricated Cu-loaded N-TiO2 materials show high activity in photocatalytic decomposing isopropanol and inactivating E. coli under the irradiation of a household white LED lamp. The developed synthetic strategy and photocatalytic materials reported here are promising for indoor environment purification.
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35
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Thi Khanh Van N, Dinh NN, Van Chien N, Huy NN, Trung NT, Toan TQ, Van Thanh D. A simple and efficient ultrasonic-assisted electrochemical approach for scalable production of nitrogen-doped TiO 2nanocrystals. NANOTECHNOLOGY 2021; 32:465602. [PMID: 34359057 DOI: 10.1088/1361-6528/ac1b55] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/06/2021] [Indexed: 06/13/2023]
Abstract
In this study, we report a facile and effective approach for large-scale production of nitrogen-doped TiO2nanocrystals (UNTs) by a combination of ultrasonic irradiation and electrochemistry at room temperature using NH4NO3electrolyte as the nitrogen source. The as-prepared UNTs were then characterized by x-ray diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and UV-visible diffuse reflectance spectroscopy. The results indicated that the nitrogen content of UNTs reached 9.3% and bandgap energy of 2.62 eV, thus gave the high photocatalytic degradation of methylene blue under visible light irradiation. The mechanism for the formation of UNTs by ultrasonic-assisted electrochemical approach was also proposed.
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Affiliation(s)
- Nguyen Thi Khanh Van
- VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy road, Cau Giay, Hanoi, Vietnam
- Institute of Science and Technology, TNU-University of Sciences, Tan Thinh ward, Thai Nguyen City, Vietnam
| | - Nguyen Nang Dinh
- VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy road, Cau Giay, Hanoi, Vietnam
| | - Nguyen Van Chien
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi, Vietnam
| | - Nguyen Nhat Huy
- Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet St., Dist. 10, Ho Chi Minh City, Vietnam
- Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
| | - Nguyen Thanh Trung
- Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi, Vietnam
| | - Tran Quoc Toan
- Faculty of Chemistry, TNU-University of Education, 20 Luong Ngoc Quyen St., Thai Nguyen City, Vietnam
| | - Dang Van Thanh
- VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy road, Cau Giay, Hanoi, Vietnam
- Faculty of Basic Sciences, TNU-University of Medicine and Pharmacy, 284 Luong Ngoc Quyen St., Thai Nguyen City, Vietnam
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36
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Rani A, Dhiman RL, Singh V, Kumar S, Kumar S. Photocatalytic study of Ni-N-codoped TiO2 nanoparticles under visible light irradiation. NANO EXPRESS 2021. [DOI: 10.1088/2632-959x/abe058] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Abstract
In present paper pure and Ni-N-codoped TiO2 nanoparticles have been synthesized via sol gel technique. Crystal phase formation of as synthesized nanoparticles was determined from x-ray diffraction which confirms the existence of anatase phase of TiO2. The average crystalline size was determined from x-ray diffraction and estimated from Transmission Electron Micrographs found to vary from 24.8 nm to 10.2 nm. The morphology was studied by Field Emission Scanning Electron Microscopy and reveals that the synthesized nanoparticles are highly crystalline, spherical and small agglomerated. It is observed that on doping the agglomeration decreases and is due to relative rates of growth process. The band gap energy was calculated from UV–visible absorption spectroscopy and found to be 3.12, 1.81, 1.69 and 1.53 eV respectively. The appearance of emission bands at 453, 470, 483 and 494 nm in Photoluminescence spectra could be arising from defect energy states caused by oxygen vacancies within the forbidden region of TiO2.The structural formation of the synthesized nanoparticles is investigated from Fourier-transform-infrared and Energy dispersive x-ray spectroscopy measurements. Photocatalytic degradation efficiency of as synthesized nanoparticles against two different dyes (Congo red and Methyl orange) was investigated under visible light source of wavelength 420–520 nm and is found to increase with dopant concentration (x). It is observed that the increase in Photocatalytic degradation efficiency of synthesized nanoparticles is attributed to decrease in carrier recombination rate arises from the decrease in band gap energy. On the basis of these observations it is concluded that the increase in Photocatalytic activity is due to increase in surface area arises from the decrease in average crystalline size of the synthesized nanoparticles.
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37
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Shrestha B, Ezazi M, Kwon G. Engineered Nanoparticles with Decoupled Photocatalysis and Wettability for Membrane-Based Desalination and Separation of Oil-Saline Water Mixtures. NANOMATERIALS 2021; 11:nano11061397. [PMID: 34070494 PMCID: PMC8227411 DOI: 10.3390/nano11061397] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 05/21/2021] [Accepted: 05/22/2021] [Indexed: 12/14/2022]
Abstract
Membrane-based separation technologies are the cornerstone of remediating unconventional water sources, including brackish and industrial or municipal wastewater, as they are relatively energy-efficient and versatile. However, membrane fouling by dissolved and suspended substances in the feed stream remains a primary challenge that currently prevents these membranes from being used in real practices. Thus, we directly address this challenge by applying a superhydrophilic and oleophobic coating to a commercial membrane surface which can be utilized to separate and desalinate an oil and saline water mixture, in addition to photocatalytically degrading the organic substances. We fabricated the photocatalytic membrane by coating a commercial membrane with an ultraviolet (UV) light-curable adhesive. Then, we sprayed it with a mixture of photocatalytic nitrogen-doped titania (N-TiO2) and perfluoro silane-grafted silica (F-SiO2) nanoparticles. The membrane was placed under a UV light, which resulted in a chemically heterogeneous surface with intercalating high and low surface energy regions (i.e., N-TiO2 and F-SiO2, respectively) that were securely bound to the commercial membrane surface. We demonstrated that the coated membrane could be utilized for continuous separation and desalination of an oil–saline water mixture and for simultaneous photocatalytic degradation of the organic substances adsorbed on the membrane surface upon visible light irradiation.
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38
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Mechanochemical Synthesis of TiO2 Nanoparticles and Their Self-organization at Interfaces to Produce Emulsion-Templated Photocatalytic Porous Polymers. J Inorg Organomet Polym Mater 2021. [DOI: 10.1007/s10904-021-01885-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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39
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Vital-Grappin AD, Ariza-Tarazona MC, Luna-Hernández VM, Villarreal-Chiu JF, Hernández-López JM, Siligardi C, Cedillo-González EI. The Role of the Reactive Species Involved in the Photocatalytic Degradation of HDPE Microplastics Using C,N-TiO 2 Powders. Polymers (Basel) 2021; 13:999. [PMID: 33805116 PMCID: PMC8037624 DOI: 10.3390/polym13070999] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/21/2021] [Accepted: 03/22/2021] [Indexed: 12/18/2022] Open
Abstract
Microplastics (MPs) are distributed in a wide range of aquatic and terrestrial ecosystems throughout the planet. They are known to adsorb hazardous substances and can transfer them across the trophic web. To eliminate MPs pollution in an environmentally friendly process, we propose using a photocatalytic process that can easily be implemented in wastewater treatment plants (WWTPs). As photocatalysis involves the formation of reactive species such as holes (h+), electrons (e-), hydroxyl (OH●), and superoxide ion (O2●-) radicals, it is imperative to determine the role of those species in the degradation process to design an effective photocatalytic system. However, for MPs, this information is limited in the literature. Therefore, we present such reactive species' role in the degradation of high-density polyethylene (HDPE) MPs using C,N-TiO2. Tert-butanol, isopropyl alcohol (IPA), Tiron, and Cu(NO3)2 were confirmed as adequate OH●, h+, O2●- and e- scavengers. These results revealed for the first time that the formation of free OH● through the pathways involving the photogenerated e- plays an essential role in the MPs' degradation. Furthermore, the degradation behaviors observed when h+ and O2●- were removed from the reaction system suggest that these species can also perform the initiating step of degradation.
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Affiliation(s)
- Aranza Denisse Vital-Grappin
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
| | - Maria Camila Ariza-Tarazona
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1, 41125 Modena, Italy; (M.C.A.-T.); (C.S.)
| | - Valeria Montserrat Luna-Hernández
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
| | - Juan Francisco Villarreal-Chiu
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
- Centro de Investigación en Biotecnología y Nanotecnología (CIByN), Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Parque de Investigación e Innovación Tecnológica, Km. 10 Autopista al Aeropuerto Internacional Mariano Escobedo, Apodaca 66629, Nuevo León, Mexico
| | - Juan Manuel Hernández-López
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
| | - Cristina Siligardi
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1, 41125 Modena, Italy; (M.C.A.-T.); (C.S.)
| | - Erika Iveth Cedillo-González
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1, 41125 Modena, Italy; (M.C.A.-T.); (C.S.)
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Japa M, Tantraviwat D, Phasayavan W, Nattestad A, Chen J, Inceesungvorn B. Simple preparation of nitrogen-doped TiO2 and its performance in selective oxidation of benzyl alcohol and benzylamine under visible light. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125743] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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41
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Li Y, Zhang Q, Jiang J, Li L. Long-acting photocatalytic degradation of crude oil in seawater via combination of TiO 2 and N-doped TiO 2/reduced graphene oxide. ENVIRONMENTAL TECHNOLOGY 2021; 42:860-870. [PMID: 31329026 DOI: 10.1080/09593330.2019.1647291] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 07/16/2019] [Indexed: 06/10/2023]
Abstract
N-doped TiO2/ reduced graphene oxide (N/TiO2/rGO) composite was prepared and used together with the commercial TiO2 for comparative research on photocatalytic degradation of crude oil in seawater. Five test conditions were designed including a combined catalyst of TiO2 and N/TiO2/rGO (4:1) under UV-A light irradiation with a duration of 28 days. The changing trend of the water-soluble fraction (WSF) of crude oil in seawater was monitored by ultraviolet spectroscopy and fluorescence spectroscopy as well as dissolved organic carbon (DOC) measurement. The SARA fractions of oil residues were analysed by column chromatography, and the chemical composition changes of saturates and aromatics were investigated by gas chromatography-mass spectroscopy (GC-MS). The results reveal that although it had high efficiency in the degradation of aromatics, the nano-TiO2 tended to self-agglomerate, which enhanced agglomeration of crude oil, causing its catalytic process actually terminating within seven days. By comparison, the N/TiO2/rGO composite consistently dispersed crude oil in the whole experimental duration, subsequently, it presented a higher photocatalytic degradation rate than TiO2. The combination of TiO2 and N/TiO2/rGO (4:1) shows concerted catalysis on photocatalytic degradation of crude oil, and the oil degradation rate reached to 54.80% while the aromatic degradation rate was 74.83%. The fluorescent components in WSFs were preferentially degraded, and the degradation products of aromatic fraction were CO2 and H2O as well as saturates, mainly C20∼C31 alkanes. Considering its long-acting photocatalysis, the N/TiO2/rGO composite possesses practical utilization potentiality together with TiO2 in spilled oil treatment in the marine environment.
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Affiliation(s)
- Yinghui Li
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, People's Republic of China
| | - Qianqian Zhang
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, People's Republic of China
| | - Junxiang Jiang
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, People's Republic of China
| | - Ling Li
- College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, People's Republic of China
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42
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Characterisation of oxygen defects and nitrogen impurities in TiO 2 photocatalysts using variable-temperature X-ray powder diffraction. Nat Commun 2021; 12:661. [PMID: 33510151 PMCID: PMC7844033 DOI: 10.1038/s41467-021-20977-z] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 01/05/2021] [Indexed: 12/31/2022] Open
Abstract
TiO2-based powder materials have been widely studied as efficient photocatalysts for water splitting due to their low cost, photo-responsivity, earthly abundance, chemical and thermal stability, etc. In particular, the recent breakthrough of nitrogen-doped TiO2, which enhances the presence of structural defects and dopant impurities at elevated temperatures, exhibits an impressive visible-light absorption for photocatalytic activity. Although their electronic and optical properties have been extensively studied, the structure-activity relationship and photocatalytic mechanism remain ambiguous. Herein, we report an in-depth structural study of rutile, anatase and mixed phases (commercial P25) with and without nitrogen-doping by variable-temperature synchrotron X-ray powder diffraction. We report that an unusual anisotropic thermal expansion of the anatase phase can reveal the intimate relationship between sub-surface oxygen vacancies, nitrogen-doping level and photocatalytic activity. For highly doped anatase, a new cubic titanium oxynitride phase is also identified which provides important information on the fundamental shift in absorption wavelength, leading to excellent photocatalysis using visible light.
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Hosseini S, Amoozadeh A. Plasma Treatment as a Promising Environmentally Benign Approach for Synthesis of Valuable Multi-gas Doped Nano-TiO 2 -P25: An Efficient Way to Boost the Photocatalytic Performance under Visible Light Illumination. Photochem Photobiol 2021; 97:672-687. [PMID: 33372315 DOI: 10.1111/php.13374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 12/22/2020] [Indexed: 11/29/2022]
Abstract
An ingenious prospect has been established to synthesize a wide range of non-metal-doped TiO2 -P25 by plasma technique. Different atmospheres (Air, O2 , N2 , Ar and CO2 ) have been embedded on the surface of TiO2 -P25 by plasma treating as an effective alternative to wet chemical pretreatment processes. This approach is clean beyond recognition by employing pure gases as well as no need to poison precursors or organic solvents without producing waste stream, which surprisingly can meet green chemistry purposes. More specifically, plasma has been a contributing factor in the narrowing band gap energies of doped photocatalysts in comparison with pure TiO2 -P25. Synthesized photocatalysts gained enormous benefit from the plasma treatment in the selective oxidation of benzyl alcohols to associating aldehydes under blue LED illumination with excellent yields, which dramatically decreased the time reaction to many folds. Additionally, benzaldehyde formation under influence of various wavelengths of visible light, including blue photons (λmax = 460 nm), green photons (λmax = 510 nm) and red photons (λmax = 630 nm) was compared to assess the effect of plasma treating on photoactivity of nano-TiO2 -P25. Furthermore, as-prepared photocatalysts were investigated by diverse characterization techniques.
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Affiliation(s)
- Saber Hosseini
- Department of Organic Chemistry, Faculty of Chemistry, Semnan University, Semnan, Iran
| | - Ali Amoozadeh
- Department of Organic Chemistry, Faculty of Chemistry, Semnan University, Semnan, Iran
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Divyasri YV, Lakshmana Reddy N, Lee K, Sakar M, Navakoteswara Rao V, Venkatramu V, Shankar MV, Gangi Reddy NC. Optimization of N doping in TiO 2 nanotubes for the enhanced solar light mediated photocatalytic H 2 production and dye degradation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 269:116170. [PMID: 33321309 DOI: 10.1016/j.envpol.2020.116170] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 11/01/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
Herein, we report the optimization of nitrogen (N) doping in TiO2 nanotubes to achieve the enhanced photocatalytic efficiencies in degradation of dye and H2 gas evolution under solar light exposure. TiO2 nanotubes have been produced via hydrothermal process and N doping has been tuned by varying the concentration of urea, being the source for N, by solid-state dispersion process. The structural analysis using XRD showed the characteristic occupancy of N into the structure of TiO2 and the XPS studies showed the existence of Ti-N-Ti network in the N-doped TiO2 nanotubes. The obtained TEM images showed the formation of 1D tube-like structure of TiO2. Diffuse reflectance UV-Vis absorption spectra demonstrated that the N-doped TiO2 nanotubes can efficiently absorb the photons of UV-Vis light of the solar light. The optimized N-doped TiO2 nanotubes (TiO2 nanotubes vs urea @ 1:1 ratio) showed the highest degradation efficiency over methyl orange dye (∼91% in 90 min) and showed the highest rate of H2 evolution (∼19,848 μmol h-1.g-1) under solar light irradiation. Further, the recyclability studies indicated the excellent stability of the photocatalyst for the durable use in both the photocatalytic processes. The observed efficiency was ascribed to the optimized doping of N-atoms into the lattices of TiO2, which enhanced the optical properties by forming new energy levels of N atoms near the valence band maximum of TiO2, thereby increased the overall charge separation and recombination resistance in the system. The improved reusability of photocatalyst is attributed to the doping-induced structural stability in N-doped TiO2. From the observed results, it has been recognized that the established strategy could be promising for synthesizing N-doped TiO2 nanotubes with favorable structural, optical and photocatalytic properties towards dye degradation and hydrogen production applications.
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Affiliation(s)
| | - Nagappagari Lakshmana Reddy
- Department of Energy Chemical Engineering, School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, 37224, Sangju, Republic of Korea
| | - Kiyoung Lee
- Department of Energy Chemical Engineering, School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, 37224, Sangju, Republic of Korea
| | - M Sakar
- Centre for Nano and Material Sciences, Jain University, Bangalore, 562 112, Karnataka, India
| | - Vempuluru Navakoteswara Rao
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India
| | - Vemula Venkatramu
- Department of Physics, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India; Department of Physics, Krishna University Dr. MRAR PG Centre, Nuzvid, 521 201, Andhra Pradesh, India
| | - Muthukonda Venkatakrishnan Shankar
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India
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Abstract
Titanium oxide (TiO2) is a potential photocatalyst for removing toxic NOx from the atmosphere. Its practical application is, however, significantly limited by its low absorption into visible light and a high degree of charge recombination. The overall photocatalytic activity of TiO2 remains too low since it can utilize only about 4–5% of solar energy. Nitrogen doping into the TiO2 lattice takes advantage of utilizing a wide range of solar radiation by increasing the absorption capability towards the visible light region. In this work, N-doped TiO2, referred to as TC, was synthesized by a simple co-precipitation of tri-thiocyanuric acid (TCA) with P25 followed by heat treatment at 550 degrees C. The resulting nitrogen doping increased the visible-light absorption and enhanced the separation/transfer of photo-excited charge carriers by capturing holes by reduced titanium ions. As a result, TC samples exhibited excellent photocatalytic activities of 59% and 51% in NO oxidation under UV and visible light irradiation, in which the optimum mass ratio of TCA to P25 was found to be 10.
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46
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Coumarin-based quantification of hydroxyl radicals and other reactive species generated on excited nitrogen-doped TiO2. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.112913] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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47
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Macclesh Del Pino LA, Morales AB, Macclesh delPino GA, Peraza-Vazquez H. Visible light induced photocatalytic degradation of 2-nitrophenol at high concentration implementing rGOTiO 2: mathematical modeling behavior. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2020; 56:52-62. [PMID: 33119463 DOI: 10.1080/10934529.2020.1835390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/06/2020] [Accepted: 10/08/2020] [Indexed: 06/11/2023]
Abstract
This investigation implemented the nanomaterial rGOTiO2 for photodegradation of 2-nitrophenol solution at high concentrations. The 2-nitrophenol photodegradation was carried out in the presence of three kinds of light sources in the visible range spectrum. The results demonstrate that the nanomaterial rGOTiO2 is capable of pollutant degradation even in the low power light source (10 W), and have high activity under sunlight. The degradation of 2-nitrophenol was monitored by UV-vis spectroscopy, adjusting method by least squares for nonlinear functions. The equation represents the material photocatalytic activity under sunlight, which excludes climatic and variance factors. This equation predicts the pure rGOTiO2 behavior under sunlight; this will enable future research to develop more advanced processes.
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Affiliation(s)
- Luis A Macclesh Del Pino
- Centro de Investigación en Petroquímica, TecNM/Instituto Tecnológico de Ciudad Madero, Altamira, México
| | - Ana B Morales
- Centro de Investigación en Petroquímica, TecNM/Instituto Tecnológico de Ciudad Madero, Altamira, México
| | | | - Hernán Peraza-Vazquez
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Aplicada (CICATA) Unidad Altamira, Carretera Tampico-Puerto Industrial de Altamira, Altamira, México
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48
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Lee H, Kim BJ, Park YK, Kim JS, Jung SC. Assessment of photocatalytic performance of Fe/N-TiO2 photocatalysts prepared by liquid phase plasma process. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.07.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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49
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Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses. Catalysts 2020. [DOI: 10.3390/catal10090966] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Photocatalysis for air treatment or photocatalytic oxidation (PCO) is a relatively new technology which requires titanium dioxide (TiO2) and a source of light (Visible or near-UV) to degrade pollutants contained in air streams. Present approaches for the photodegradation of indoor pollutants in air streams aim to eliminate volatile organic compounds (VOCs) and viruses, which are both toxic and harmful to human health. Photocatalysis for air treatment is an inexpensive and innovative green process. Additionally, it is a technology with a reduced environmental footprint when compared to other conventional air treatments which demand significant energy, require the disposal of used materials, and release CO2 and other greenhouse gases to the environment. This review discusses the most current and relevant information on photocatalysis for air treatment. This article also provides a critical review of (1) the most commonly used TiO2-based semiconductors, (2) the experimental syntheses and the various photocatalytic organic species degradation conversions, (3) the developed kinetics and computational fluid dynamics (CFD) and (4) the proposed Quantum Yields (QYs) and Photocatalytic Thermodynamic Efficiency Factors (PTEFs). Furthermore, this article contains important information on significant factors affecting the photocatalytic degradation of organic pollutants, such as reactor designs and type of photoreactor irradiation. Overall, this review describes state-of-the-art photocatalysis for air treatment to eliminate harmful indoor organic molecules, reviewing as well the potential applications for the inactivation of SARS-CoV2 (COVID-19) viruses.
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Ariza-Tarazona MC, Villarreal-Chiu JF, Hernández-López JM, Rivera De la Rosa J, Barbieri V, Siligardi C, Cedillo-González EI. Microplastic pollution reduction by a carbon and nitrogen-doped TiO 2: Effect of pH and temperature in the photocatalytic degradation process. JOURNAL OF HAZARDOUS MATERIALS 2020; 395:122632. [PMID: 32315794 DOI: 10.1016/j.jhazmat.2020.122632] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/20/2020] [Accepted: 03/31/2020] [Indexed: 05/06/2023]
Abstract
Microplastics (MPs) are pollutants formed by plastics ≤ 5 mm and are present in marine and terrestrial environments. Due to their large surface to volume ratio and chemical surface properties, MPs adsorb hazardous chemicals from their surrounding environment. When MPs are consumed by fauna, they transfer those substances through the trophic chain. An essential issue of MPs is their disposal. Due to their size, the disposal methods commonly used for plastic items are not suited for MPs. Here, photocatalysis in an aqueous medium is proposed as an alternative to fight MPs pollution. Although the photocatalysis of MPs has been reported, the effect of operating variables in the process has not been investigated. To fill this gap, the impact of pH and temperature on the degradation process of HDPE MPs was investigated using C,N-TiO2 and visible light. Degradation was followed by mass loss, carbonyl index calculation and microscopy. It was found that photocatalysis at low temperature (0 °C) increases MPs' surface area by fragmentation, and low pH value (pH 3) favours hydroperoxide formation during photooxidation. By using the design of experiments tool, it was demonstrated that there is a combined effect of pH and temperature in the photocatalysis of HDPE MPs.
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Affiliation(s)
- Maria Camila Ariza-Tarazona
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México
| | - Juan Francisco Villarreal-Chiu
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México; Centro de Investigación en Biotecnología y Nanotecnología (CIByN), Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Parque de Investigación e Innovación Tecnológica, Km. 10 autopista al Aeropuerto Internacional Mariano Escobedo, Apodaca, 66629, Nuevo León, México
| | - Juan Manuel Hernández-López
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México
| | - Javier Rivera De la Rosa
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México
| | - Virginia Barbieri
- Università degli Studi di Modena e Reggio Emilia, Dipartimento di Ingegneria "Enzo Ferrari", Via P. Vivarelli 10/1, 41125, Italy
| | - Cristina Siligardi
- Università degli Studi di Modena e Reggio Emilia, Dipartimento di Ingegneria "Enzo Ferrari", Via P. Vivarelli 10/1, 41125, Italy
| | - Erika Iveth Cedillo-González
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México.
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