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Shao H, Li X, Zhang J, Zhao X. Peroxymonosulfate enhanced photoelectrocatalytic oxidation of organic contaminants and simultaneously cathodic recycling of silver. J Environ Sci (China) 2022; 120:74-83. [PMID: 35623774 DOI: 10.1016/j.jes.2021.08.028] [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: 06/17/2021] [Revised: 08/13/2021] [Accepted: 08/13/2021] [Indexed: 06/15/2023]
Abstract
Degradation of organic contaminants with simultaneous recycling of Ag+ from silver-containing organic wastewater such as photographic effluents is desired. Although photoelectrocatalysis (PEC) technology is a good candidate for this type of wastewater, its reaction kinetics still needs to be improved. Herein, peroxymonosulfate (PMS) was employed to enhance the PEC kinetics for oxidation of phenol (PhOH) at the anode and reduction of Ag+ at the cathode. The degradation efficiency of phenol (PhOH, 0.1 mmol/L) was increased from 42.8% to 96.9% by adding 5 mmol/L PMS at a potential of 0.25 V. Meanwhile, the Ag (by wt%) deposited on the cathode was 28.1% (Ag2O) in PEC process, while that of Ag (by wt%) was 69.7% (Ag0) by adding PMS. According to the electrochemistry analysis, PMS, as photoelectrons acceptor, enhances the separation efficiency of charges and the direct h+ oxidation of PhOH at the photoanode. Meantime, the increasing cathode potential avoided H2 evolution and strongly alkaline at the surface of cathode, thus enabling the deposition of Ag+ in the form of metallic silver with the help of PMS. In addition, PMS combined with PEC process was effective in treating photographic effluents.
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Affiliation(s)
- Huixin Shao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Xia Li
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Capital Co. Ltd., Beijing 100028, China
| | - Juanjuan Zhang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xu Zhao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Dana A, Sheibani S. CNTs-copper oxide nanocomposite photocatalyst with high visible light degradation efficiency. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.08.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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García-Valdivieso G, Arenas-Sánchez E, Horta-Fraijo P, Simakov A, Navarro-Contreras HR, Acosta B. Ag@ZnO/MWCNT ternary nanocomposite as an active and stable catalyst for the 4-nitrophenol reduction in water. NANOTECHNOLOGY 2021; 32:315713. [PMID: 33873162 DOI: 10.1088/1361-6528/abf96b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
The nitroaromatic compounds, known as organic pollutants, have arising attention due to their carcinogenic character, highly dangerous to human health. In this work, the Ag@ZnO/MWCNT ternary nanocomposite synthesized via conjugation of sonochemical and solvothermal treatments manifests high performance in the reduction of 4-nitrophenol in the aqueous media (TOF value of 246 min-1μmol metal-1). The incorporation of MWCNT onto the nanocomposite structure favored the reusing of the catalysts even after eight consecutive catalytic runs without catalysts cleaning nor product removal. Obtained samples were characterized by XRD, TEM, UV-vis, Raman and FTIR spectroscopies. It was found that ultrasonic treatment at relatively moderate conditions leads to functionalization of MWCNT, the appearance of C=C and OH groups and change of electronic properties of Ag@ZnO/MWCNT composite which provide its stable material dispersion in aqueous solution and high catalytic performance in the 4-nitrophenol reduction. This technique may be effectively applied for the functionalization of carbon including materials for their usage in an aqueous media.
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Affiliation(s)
- Guadalupe García-Valdivieso
- Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona #550, Col. Lomas 2a. Sección, CP 78210, San Luis Potosí, SLP, Mexico
| | - Eduardo Arenas-Sánchez
- Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona #550, Col. Lomas 2a. Sección, CP 78210, San Luis Potosí, SLP, Mexico
| | - Patricia Horta-Fraijo
- Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona #550, Col. Lomas 2a. Sección, CP 78210, San Luis Potosí, SLP, Mexico
| | - Andrey Simakov
- Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Km. 107 Carretera Tijuana a Ensenada, C.P. 22860, Ensenada, Baja California, Mexico
| | - Hugo R Navarro-Contreras
- Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona #550, Col. Lomas 2a. Sección, CP 78210, San Luis Potosí, SLP, Mexico
| | - Brenda Acosta
- Cátedra-CONACYT, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona #550, Col. Lomas 2a. Sección, CP 78210, San Luis Potosí, SLP, Mexico
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Mohamed MM, El-Farsy H. Rapid reduction of nitroarenes photocatalyzed by an innovative Mn 3O 4/α-Ag 2WO 4 nanoparticles. Sci Rep 2020; 10:21495. [PMID: 33299028 PMCID: PMC7725972 DOI: 10.1038/s41598-020-78542-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 11/10/2020] [Indexed: 11/22/2022] Open
Abstract
A novel photocatalyst based on the design of P-N heterojunction between hollow spherical Mn3O4 and nanorods shape of α-Ag2WO4 is synthesized using a sonication-deposition-precipitation route. The nanocomposite Mn3O4/α-Ag2WO4(60%) exhibits a great potential towards nitroarenes (including 4-nitrophenol, 4-nitro-aniline and 4-Nitro-acetanilide) reduction under visible light irradiation exceeding that of Mn3O4/α-Ag2WO4(40%) as well as their individual counterparts (3-5%). The Mn3O4/α-Ag2WO4(60%) catalyst exhibited an excellent photo-reduction activity comprised of 0.067 s-1 towards 4-nitrophenol (0.001 M) in only 60 s reaction time using NaBH4 (0.2 M). This was due to the successful formation of the Mn3O4/α-Ag2WO4 composite as validated by XRD, TEM-SAED, XPS, FTIR, UV-Vis diffuse reflectance and PL techniques. Decreasing the Eg value into 2.7 eV, the existence of a new (151) plane in the composite beside enhancement of the composite electrical conductivity (1.66 × 10-7 Ω-1 cm-1) helps the facile nitroarenes adsorption and hydrogenation. Transient photocurrent response and linear sweep voltammetry results prove the facilitation of photogenerated charge carriers separation and transport via improving electron lifetime and lessening recombination rate. The composite photocatalyst produced higher amounts of H2 production, when inserted in a typical reaction medium containing NaBH4, comprised of 470 µ mole/g exceeding those of the counterparts (35 µ mole/g). This photocatalyst is strikingly hydrogenated 4-nitrophenol under mild conditions (25 °C and 0.35 MPa pressure of H2) with magnificent rate constant equal 34.9 × 10-3 min-1 with 100% selectivity towards 4-aminophenol.
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Affiliation(s)
| | - Hassan El-Farsy
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt
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Ullah S, Fayeza, Khan AA, Jan A, Aain SQ, Neto EP, Serge-Correales YE, Parveen R, Wender H, Rodrigues-Filho UP, Ribeiro SJ. Enhanced photoactivity of BiVO4/Ag/Ag2O Z-scheme photocatalyst for efficient environmental remediation under natural sunlight and low-cost LED illumination. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124946] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Salama TM, Morsy M, Abou Shahba RM, Mohamed SH, Mohamed MM. Synthesis of Graphene Oxide Interspersed in Hexagonal WO 3 Nanorods for High-Efficiency Visible-Light Driven Photocatalysis and NH 3 Gas Sensing. Front Chem 2019; 7:722. [PMID: 31737601 PMCID: PMC6838730 DOI: 10.3389/fchem.2019.00722] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Accepted: 10/10/2019] [Indexed: 12/02/2022] Open
Abstract
WO3 nanorods and GO (at 1 wt% loading) doped WO3 were synthesized using a template free deposition-hydrothermal route and thoroughly characterized by various techniques including XRD, FTIR, Raman, TEM-SAED, PL, UV-Vis, XPS, and N2 adsorption. The nano-materials performance was investigated toward photocatalytic degradation of methylene blue dye (20 ppm) under visible light illumination (160 W, λ> 420) and gas sensing ability for ammonia gas (10–100 ppm) at 200°C. HRTEM investigation of the 1%GO.WO3 composite revealed WO3 nanorods of a major d-spacing value of 0.16 nm indexed to the crystal plane (221). That relevant plane was absent in pure WO3 establishing the intercalation with GO. The MB degradation activity was considerably enhanced over the 1%GO.WO3 catalyst with a rate constant of 0.0154 min−1 exceeding that of WO3 by 15 times. The reaction mechanism was justified dependent on electrons, holes and •OH reactive species as determined via scavenger examination tests and characterization techniques. The drop in both band gap (2.49 eV) and PL intensity was the main reason responsible for enhancing the photo-degradation activity of the 1%GO.WO3 catalyst. The later catalyst initiated the two electron O2 reduction forming H2O2, that contributed in the photoactivity improvement via forming •OH moieties. The hexagonal structure of 1%GO.WO3 showed a better gas sensing performance for ammonia gas at 100 ppm (Ra-Rg/Rg = 17.6) exceeding that of pure WO3 nanorods (1.27). The superiority of the gas-sensing property of the 1%GO.WO3 catalyst was mainly ascribed to the high dispersity of GO onto WO3 surfaces by which different carbon species served as mediators to hinder the recombination rate of photo-generated electron-hole pairs and therefore facilitated the electron transition. The dominancy of the lattice plane (221) in 1%GO.WO3 formed between GO and WO3 improved the electron transport in the gas-sensing process.
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Affiliation(s)
- Tarek M Salama
- Department of Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt
| | - Mohamed Morsy
- Building Physics and Environment Institute, Housing and Building National Research Center (HBRC), Giza, Egypt
| | - Rabab M Abou Shahba
- Department of Chemistry, Faculty of Science (Girls Branch), Al-Azhar University, Cairo, Egypt
| | - Shimaa H Mohamed
- Department of Chemistry, Faculty of Science (Girls Branch), Al-Azhar University, Cairo, Egypt
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Suo N, Wang M, Jin Y, Ding J, Gao X, Sun X, Zhang H, Cui M, Zheng J, Li N, Jin X, Jiang S. Magnetic multiwalled carbon nanotubes with controlled release of epirubicin: an intravesical instillation system for bladder cancer. Int J Nanomedicine 2019; 14:1241-1254. [PMID: 30863057 PMCID: PMC6391142 DOI: 10.2147/ijn.s189688] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Background Traditional intravesical instillation treatment in bladder cancer has limited efficacy, which results in a high frequency of recurrence. Purpose The aim of this study was to report on an epirubicin (EPI)-loaded magnetic multi-walled carbon nanotube (mMWCNTs-EPI) system for intravesical instillation in place of the current formulation. Methods The mMWCNTs-EPI system was formulated with carboxylated MWCNTs, Fe3O4 magnetic nanoparticles, and EPI. Features and antitumor activity of the system were investigated. Results Under the effect of external magnets, the mMWCNTs-EPI system showed sustained release and prolonged retention behavior and better antitumor activity than free EPI. The mMWCNTs-EPI system had higher efficiency in enhancing cytotoxicity and inhibiting proliferation in vitro and in vivo than free EPI. Our studies also revealed the atoxic nature of mMWCNTs. Conclusion These findings suggested that mMWCNTs are effective intravesical instillation agents with great potential for clinical application.
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Affiliation(s)
- Ning Suo
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Muwen Wang
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Yang Jin
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Jun Ding
- Department of Mechanical Engineering, University of Maryland, Baltimore County, Baltimore, MD, 21250, USA
| | - Xueping Gao
- School of Material Science and Engineering, Shandong University, Jinan 250100, China
| | - Xiaoliang Sun
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Haiyang Zhang
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Meng Cui
- Department of Urology, Shandong Provincial Maternity and Childcare Hospital, Jinan 250014, China
| | - Jilu Zheng
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Nianlu Li
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Xunbo Jin
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
| | - Shaobo Jiang
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan 250021, China, ;
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