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Wang A, Zhang L, Li X, Gao Y, Li N, Lu G, Ge L. Synthesis of ternary Ni2P@UiO-66-NH2/Zn0.5Cd0.5S composite materials with significantly improved photocatalytic H2 production performance. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)63912-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bhattacharya S, Das AA, Chandra Dhal G, Sahoo PK, Tripathi A, Sahoo NK. Evaluation of N doped rGO-ZnO-CoPc(COOH) 8 nanocomposite in cyanide degradation and its bactericidal activities. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 302:114022. [PMID: 34735832 DOI: 10.1016/j.jenvman.2021.114022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 09/25/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
In the present study, an attempt has been made to design a solar light driven N-rGO-ZnO- CoPc(COOH)8 nanocomposite for the degradation of cyanide. The morphological and structural characterization of the synthesized nanocomposite was performed by XRD, FT-IR, XPS, UV-vis DRS, FESEM, TEM, EDS, PL spectra and BET surface area. The results revealed that almost 91% degradation and 86% toxicity removal occurred at 25 mgL-1 of initial cyanide concentration by the N-rGO-ZnO-CoPc(COOH)8 nanocomposite under illumination of solar light within 120 min. Analysis of free radicals reveals that the generation of OH. radicals was the predominant species in the photocatalytic degradation process. The cyanide degradation follows pseudo-first order kinetics. The estimated apparent rate constant (Kapp) of the above nanocomposite was 3 times higher than that of the ZnO photocatalyst alone together with a very good recycle activities. This might be due to the application of metallpthalocyanine photosensitizer CoPc(COOH)8 which enhances the rate of visible light absorption efficiency and activates the higher band gap ZnO photocatalyst under visible light. In addition, the presence of residual oxygen in N-rGO also promotes nucleation and anchor sites for interfacial contact between ZnO and N-rGO for effective charge transfer. Further, the N-rGO-ZnO-CoPc(COOH)8 photocatalytic system showed significant antibacterial activities against mixed culture systems. Therefore, the N-rGO-ZnO-CoPc(COOH)8 nanocomposite may be an alternative solar light driven photocatalyst system for the removal of cyanide from the wastewater along with its strong disinfectant activities.
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Affiliation(s)
- Shramana Bhattacharya
- Department of Chemistry, Environmental Science Program, Faculty of Engineering and Technology (ITER), Siksha'O'Anusandhan (Deemed to be University), Bhubaneswar, 751030, Odisha, India
| | - Anup Anang Das
- Department of Chemistry, Environmental Science Program, Faculty of Engineering and Technology (ITER), Siksha'O'Anusandhan (Deemed to be University), Bhubaneswar, 751030, Odisha, India
| | - Ganesh Chandra Dhal
- Department of Civil Engineering, National Institute of Technology, Meghalaya, India
| | - Prasanta Kumar Sahoo
- Department of Mechanical Engineering, Faculty of Engineering and Technology (ITER), Siksha'O'Anusandhan (Deemed to be University), Bhubaneswar, 751 030, Odisha, India
| | - Abhishek Tripathi
- Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India
| | - Naresh Kumar Sahoo
- Department of Chemistry, Environmental Science Program, Faculty of Engineering and Technology (ITER), Siksha'O'Anusandhan (Deemed to be University), Bhubaneswar, 751030, Odisha, India.
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Pan Y, Zhang Y, Huang Y, Jia Y, Cui H, Wang M. Turning Pore Size of Silica-Based Nano-TiO₂ for Treating Cyanide Wastewater. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2021; 21:5150-5156. [PMID: 33875100 DOI: 10.1166/jnn.2021.19444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cyanide wastewater is a very highly toxic substance. In this study, a kind of silicon-based nano-TiO₂ material by turning pore size accurately is prepared to treat cyanide wastewater. The materials are characterized by XRD, TG analysis, N₂ adsorption/desorption test, UVAS analysis and TEM. Results show that adding NaCl to the synthesis of silica supports can change the size of pores. It emerges that pore size can affect the catalytic performance of the material. Catalytic experiments confirm that cyanide has the best catalytic effect when it has a pore size of 16.47 nm. UVAS spectrum demonstrate that the cyanide has been broken down rather than adsorbed onto the material.
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Affiliation(s)
- Yubo Pan
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, Shandong, China
| | - Yali Zhang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, Shandong, China
| | - Yaoguo Huang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, Shandong, China
| | - Yun Jia
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, Shandong, China
| | - Hongyou Cui
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, Shandong, China
| | - Ming Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049, Zibo, Shandong, China
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Mechanism investigation of PtPd decorated Zn0.5Cd0.5S nanorods with efficient photocatalytic hydrogen production combining with kinetics and thermodynamics. CHINESE JOURNAL OF CATALYSIS 2021. [DOI: 10.1016/s1872-2067(21)63791-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals. Processes (Basel) 2019. [DOI: 10.3390/pr7040225] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
For gold extraction, the most used extraction technique is the Merrill-Crow process, which uses lixiviants as sodium or potassium cyanide for gold leaching at alkaline conditions. The cyanide ion has an affinity not only for gold and silver, but for other metals in the ores, such as Al, Fe, Cu, Ni, Zn, and other toxic metals like Hg, As, Cr, Co, Pb, Sn, and Mn. After the extraction stage, the resulting wastewater is concentrated at alkaline conditions with concentrations up to 1000 ppm of metals. Photocatalysis is an advanced oxidation process (AOP) able to generate a photoreaction in the solid surface of a semiconductor activated by light. Although it is well known that photocatalytic processes can remove metals in solution, there are no compilations about the researches on photocatalytic removal of metals in wastewater with cyanide. Hence, this review comprises the existing applications of photocatalytic processes to remove metal and in some cases recover cyanide from recalcitrant wastewater from gold extraction. The use of this process, in general, requires the addition of several scavengers in order to force the mechanism to a pathway where the electrons can be transferred to the metal-cyanide matrices, or elsewhere the entire metallic cyanocomplex can be degraded by an oxidative pathway.
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Liu Y, Du C, Zhou C, Yang S. One-step synthesis of hierarchical AuNPs/Cd0.5Zn0.5S nanoarchitectures and their application as an efficient photocatalyst for hydrogen production. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.12.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wu D, Li J, Guan J, Liu C, Zhao X, Zhu Z, Ma C, Huo P, Li C, Yan Y. Improved photoelectric performance via fabricated heterojunction g-C3N4/TiO2/HNTs loaded photocatalysts for photodegradation of ciprofloxacin. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.03.017] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Azami M, Haghighi M, Allahyari S. Sono-precipitation of Ag 2CrO 4-C composite enhanced by carbon-based materials (AC, GO, CNT and C 3N 4) and its activity in photocatalytic degradation of acid orange 7 in water. ULTRASONICS SONOCHEMISTRY 2018; 40:505-516. [PMID: 28946452 DOI: 10.1016/j.ultsonch.2017.07.043] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Revised: 07/28/2017] [Accepted: 07/29/2017] [Indexed: 06/07/2023]
Abstract
Enhancing the photocatalytic activity of Ag2CrO4 with coupled carbon-based materials like activated carbon, graphene oxide, carbon nanotubes and carbon nitride has been investigated in removal of Acid Orange 7 from wastewater. Sono precipitated Ag2CrO4-C composite based photocatalysts were characterized by XRD, BET, FESEM, FTIR and UV-vis DRS and the photocatalytic activity of theses samples was evaluated in terms of degradation amount of acid orange 7 under visible light irradiations. BET analysis showed that with addition of carbon based materials, the specific surface area of the Ag2CrO4-C composite increased. XRD analysis indicated that the crystallinity of Ag2CrO4 peaks decreased after addition of all studied carbon-based materials and C3N4 has lowered the crystallinity of Ag2CrO4 less than others. Higher crystallinity has the positive effect of higher photocatalytic activity because among above mentioned composites, Ag2CrO4-C3N4 photocatalyst exhibited higher photocatalytic activity and stability under visible light irradiations. DRS analysis confirmed good match of electronic structures of Ag2CrO4 and C3N4. On the other hand Ag2CrO4 and C3N4 formed heterojunction which separates photo-generated electron-hole pairs effectively. Also evaluation of photocatalytic reaction in various operating parameters showed Ag2CrO4-C3N4 had the highest photocatalytic activity in neutral pH and 1g/L of catalyst loading.
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Affiliation(s)
- Mina Azami
- Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran; Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
| | - Mohammad Haghighi
- Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran; Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran.
| | - Somaiyeh Allahyari
- Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran; Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
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Lovasoa CR, Hela K, Harinaivo AA, Hamma Y. Bioremediation of soil and water polluted by cyanide: A review. ACTA ACUST UNITED AC 2017. [DOI: 10.5897/ajest2016.2264] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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