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New Application of Polyoxometalate Salts as Cathode Materials in Single Chamber MFC Using Wastewater for Bioenergy Production. Processes (Basel) 2023. [DOI: 10.3390/pr11030836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023] Open
Abstract
Microbial fuel cells (MFCs) are a promising technology that can be applied in a bifunctional process in which wastewater treatment is used for renewable electric power generation. In this study, novel transition metal-modified Keggin-type lacunar polyoxometalate salts (L-POMs) Cs5PMo11M(H2O)O39 (M = Fe, Co), were synthesized and characterized by X-ray diffraction, SEM, EDX, IR, TGA/DSC, and UV-Vis/DSR spectroscopies to be tested, for the first time, as a cathode component in wastewater-fed air chamber MFCs. Both materials were tested in the presence and absence of light to evaluate their photocatalytic behavior. The best performance in terms of electricity production was obtained for the MFC containing the Co-modified POM-based cathode, which showed a maximum power of 418.15 mW/m2 equivalent to 331 mW per cubic meter of treated wastewater, and a maximum COD removal percentage of 97% after 96 h of MFC operation. Co- and Fe-modified POMs had outstanding optical behavior with lower energy gap values, 1.71 and 2.68 eV, respectively. The newly developed materials can be considered as promising alternative cathode catalysts in a new generation of MFC devices integrating full carbon removal from wastewater and a fast reduction of oxygen.
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Singh M, Yadav A, Pradeep CP. Keggin Cluster Modulated Photocatalytic Activity of Aryl Sulfonium Polyoxometalate Hybrids toward Dichromate Reduction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:16034-16045. [PMID: 36511348 DOI: 10.1021/acs.langmuir.2c02529] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Dichromate (Cr2O72-) ion having chromium in its +6 oxidation state is a carcinogen and a potential threat to humans and aquatic life. The photocatalytic reduction of toxic Cr(VI) species into less toxic Cr(III) is an important target in heterogeneous catalysis. In this work, the catalytic activities of a series of Keggin cluster-based aryl sulfonium polyoxometalate hybrids, (FPDS)3[PMo12O40] (1), (FPDS)3[PW12O40] (2), (FPDS)4[SiMo12O40] (3), and (FPDS)4[SiW12O40] (4), toward the photocatalytic reduction of Cr(VI) have been analyzed and compared. Here, we used the aryl sulfonium counterions to modulate the POM cluster's solubility in water and stabilize the photogenerated e--h+ pair on the cluster. All of the hybrids 1-4 catalyzed the reduction of Cr(VI) to Cr(III) under ultraviolet (UV) irradiation, and their photocatalytic efficiencies followed the order hybrid 1 > hybrid 3 > hybrid 2 > hybrid 4, with the rate-constant values of 0.048, 0.0056, 0.0035, and 0.0028 min-1, respectively. Hybrid 1 with [PMo12O40]3- Keggin cluster exhibited the best photocatalytic activity in the series yielding a 99% reduction in 120 min. The reasons behind the best photocatalytic activity of hybrid 1 are identified as its low band gap, less charge recombination, and fast photoresponse. The electron-trapping analyses performed using AgNO3 revealed electrons as the main reactive species responsible for the photocatalytic reduction of Cr(VI). A plausible photocatalytic mechanism has also been proposed based on electron-trapping experiments. The present study shows that aryl sulfonium Keggin hybrids can function as efficient photocatalysts for Cr(VI) reduction, and their catalytic efficiency varies with the nature of the Keggin cluster.
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Affiliation(s)
- Mahender Singh
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi175075, Himachal Pradesh, India
| | - Aman Yadav
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi175075, Himachal Pradesh, India
| | - Chullikkattil P Pradeep
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi175075, Himachal Pradesh, India
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Bharath G, Hai A, Kiruthiga T, Rambabu K, Sabri MA, Park J, Choi MY, Banat F, Haija MA. Fabrication of Ru-CoFe 2O 4/RGO hierarchical nanostructures for high-performance photoelectrodes to reduce hazards Cr(VI) into Cr(III) coupled with anodic oxidation of phenols. CHEMOSPHERE 2022; 299:134439. [PMID: 35351477 DOI: 10.1016/j.chemosphere.2022.134439] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/16/2022] [Accepted: 03/23/2022] [Indexed: 06/14/2023]
Abstract
Dual-functional photo (electro)catalysis (PEC) is a key strategy for removing coexisting heavy metals and phenolic compounds from wastewater treatment systems. To design a PEC cell, it is crucial to use chemically stable and cost-effective bifunctional photocatalysts. The present study shows that ruthenium metallic nanoparticles decorated with CoFe2O4/RGO (Ru-CoFe2O4/RGO) are effective bifunctional photoelectrodes for the reduction of Cr(VI) ions. Ru-CoFe2O4/RGO achieves a maximum Cr(VI) reduction rate of 99% at 30 min under visible light irradiation, which is much higher than previously reported catalysts. Moreover, PEC Cr(VI) reduction rate is also tuned by adding varying concentration of phenol. A mechanism for the concurrent removal of Cr(VI) and phenol has been revealed over a bifunctional Ru-CoFe2O4/RGO catalyst. A number of key conclusions emerged from this study, demonstrating the dual role of phenol during Cr(VI) reduction by PEC. Anodic oxidation of phenol produces the enormous H+ ion, which appears to be a key component of Cr(VI) reduction. Additionally, phenolic molecules serve as hole (h+) scavengers that reduce e-/h+ recombination, thus enhancing the reduction rate of Cr(VI). Therefore, the Ru-CoFe2O4/RGO photoelectrode exhibits a promising capability of reducing both heavy metals and phenolic compounds simultaneously in wastewater.
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Affiliation(s)
- G Bharath
- Department of Chemical Engineering, Khalifa University, P.O. Box, 127788, Abu Dhabi, United Arab Emirates.
| | - Abdul Hai
- Department of Chemical Engineering, Khalifa University, P.O. Box, 127788, Abu Dhabi, United Arab Emirates
| | - T Kiruthiga
- Centre for Nanoscience and Technology, Anna University, Chennai, 600025, India
| | - K Rambabu
- Department of Chemical Engineering, Khalifa University, P.O. Box, 127788, Abu Dhabi, United Arab Emirates
| | - Muhammad Ashraf Sabri
- Department of Chemical Engineering, Khalifa University, P.O. Box, 127788, Abu Dhabi, United Arab Emirates
| | - Juhyeon Park
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Myong Yong Choi
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Fawzi Banat
- Department of Chemical Engineering, Khalifa University, P.O. Box, 127788, Abu Dhabi, United Arab Emirates.
| | - Mohammad Abu Haija
- Department of Chemistry, Khalifa University, P.O. Box, 127788, Abu Dhabi, United Arab Emirates.
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Guo R, Bai L, Dong G, Chai D, Lang K, Mou Z, Zhao M. Construction of ZnO/Keggin Polyoxometalate Nano-heterojunction Catalyst for Efficient Removal of Rhodamine B in Aqueous Solution. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02251-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Qin J, Cao X, Huang H, Fu Z, Wu JM, Zhang P, Ye Z, Wen W. Modulation of titania nanoflower arrays transformed from titanate nanowire arrays to boost photocatalytic Cr( vi) detoxification. NEW J CHEM 2022. [DOI: 10.1039/d2nj03748c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The integration of the N/S co-doping, anatase/rutile junction construction, and morphology regulation of TiO2 arrays is achieved by a simple method to improve photocatalytic activity.
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Affiliation(s)
- Jiayi Qin
- School of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, China
| | - Xusheng Cao
- School of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, China
- Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China
| | - Haijun Huang
- Zhejiang Testing & Inspection Institute for Mechanical and Electrical Products Quality Co., Ltd, Hangzhou 310051, China
| | - Zhaogang Fu
- Hainan Boxin Environmental Technology Co., Ltd, Haikou 571199, China
| | - Jin-Ming Wu
- Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Pengfei Zhang
- School of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, China
| | - Zhizhen Ye
- Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Zhejiang University, Hangzhou 310027, China
| | - Wei Wen
- School of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, China
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Shen H, Fu F, Xue W, Yang X, Ajmal S, Zhen Y, Guo L, Wang D, Chi R. In situ fabrication of Bi2MoO6/Bi2MoO6-x homojunction photocatalyst for simultaneous photocatalytic phenol degradation and Cr(VI) reduction. J Colloid Interface Sci 2021; 599:741-751. [DOI: 10.1016/j.jcis.2021.04.122] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 04/16/2021] [Accepted: 04/25/2021] [Indexed: 02/06/2023]
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Wang H, Yu JM, Wang N, Xiao LL, Yu JP, Xu Q, Zheng B, Cheng FF, Xiong WW. Two silver chalcogenidoantimonates synthesized in piperazine and their high performances for visible-light driven Cr(VI) reduction. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122276] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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