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Tian C, Yuan P, Huang W, Song F, Zhao W. MoS 2 nanosheets embedded in α-FeOOH as an efficient cathode for enhanced MFC-electro-Fenton performance in wastewater treatment. ENVIRONMENTAL RESEARCH 2023; 216:114818. [PMID: 36400219 DOI: 10.1016/j.envres.2022.114818] [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: 09/19/2022] [Revised: 11/02/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
Microbial fuel cell-electro-Fenton system (MEF) has attracted attention due to refractory organic pollutants removal, where H2O2 is in-situ produced without external energy supply. Enhancement of H2O2 production and the activation of H2O2 to ·OH are the keys to improve degradation performance. Development of bifunctional catalytic cathode is a viable strategy. Herein, the α-FeOOH/MoS2 nanocomposites was fabricated by a novel facile hydrothermal method based on molybdenite-exfoliated MoS2 nanosheets suspension, which was used as modified cathode in a MEF system. The obtained α-FeOOH/1 wt%MoS2 cathode exhibited highest power density of 292.38 mW/m2, which was about 3.7 and 1.7 times higher than that of graphite plate and α-FeOOH, respectively. Doping of MoS2 nanosheets significantly enhanced electrocatalytic activity of the cathode and promoted in-situ H2O2 generation. Meanwhile, the exposed reductive Mo4+ on the surface of MoS2 could greatly facilitate the conversion cycle of Fe(III)/Fe(II), leading to the efficient activation of H2O2 into ·OH. The MEF with α-FeOOH/1 wt%MoS2 cathode exhibited excellent degradation and mineralization performance for MB, rhodamine B and tetracycline hydrochloride at optimized reaction condition. Furthermore, the MEF can simultaneously achieve MB oxidation and Cr(VI) reduction, and the corresponding removal ratio can reach up to 91.45% and 100%, respectively. Based on simple preparation method as well as recyclability and excellent catalytic property, the α-FeOOH/MoS2 composite catalyst is considered as a promising MEF cathode for efficient wastewater treatment.
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Affiliation(s)
- Congqi Tian
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China; Baotou Research Institute of Rare Earths, Baotou, 014030, China
| | - Ping Yuan
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China
| | - Weili Huang
- Inner Mongolia Academy of Forestry, Hohhot, 010010, China
| | - Feiyu Song
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China
| | - Wenyan Zhao
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China.
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Zhang Q, Ma W, Peng Q, Shu X. Stabilization and Utilization of Pyrite under Light Irradiation: Discussion of Photocorrosion Resistance. ACS OMEGA 2020; 5:28693-28701. [PMID: 33195922 PMCID: PMC7658925 DOI: 10.1021/acsomega.0c03872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 10/09/2020] [Indexed: 06/11/2023]
Abstract
The control of pyrite (FeS2) oxidation from a source is a problem of great concern on treatment of acid mine drainage (AMD). Compared with air and water, the effect of light on pyrite oxidation has not attracted enough attention. However, we found that pyrite photocorrosion in the light promoted the oxidation of pyrite. Herein, we introduce a method of coating pyrite with graphene oxide (GO), which can inhibit the oxidation and photocorrosion of pyrite while it can also degrade organic pollutants. The characterization results show that a covalent bond forms between the GO and pyrite. The stable and uniform GO coating prevents the permeation of O2 and H2O and promotes the transfer of photogenerated electrons. Moreover, it changes the conduction band (CB) and valence band (VB) levels of GO-pyrite. All of these are vital for preventing the corrosion of pyrite and promoting its photocatalytic ability. More importantly, the effect of CB and VB levels on the oxidized species was discussed. The inhibition of photocorrosion is achieved by the reaction of GO with the photoinduced h+, •OH, and •O2 -. The study provides insights for source treatment of AMD under light and the reuse of massive abandoned pyrite.
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Affiliation(s)
- Qian Zhang
- School
of Life and Environmental Science, Guilin
University of Electronic Technology, Guilin, Guangxi 541000, China
| | - Weishi Ma
- School
of Life and Environmental Science, Guilin
University of Electronic Technology, Guilin, Guangxi 541000, China
| | - Qiuyan Peng
- School
of Life and Environmental Science, Guilin
University of Electronic Technology, Guilin, Guangxi 541000, China
| | - Xiaohua Shu
- College
of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi 541000, China
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Rajitha K, Mohana KNS, Mohanan A, Madhusudhana AM. Evaluation of anti-corrosion performance of modified gelatin-graphene oxide nanocomposite dispersed in epoxy coating on mild steel in saline media. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124341] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Wang X, Yin R, Zeng L, Zhu M. A review of graphene-based nanomaterials for removal of antibiotics from aqueous environments. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 253:100-110. [PMID: 31306819 DOI: 10.1016/j.envpol.2019.06.067] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 06/05/2019] [Accepted: 06/18/2019] [Indexed: 05/29/2023]
Abstract
Antibiotics as emerging pharmaceutical pollutants have seriously not only threatened human life and animal health security, but also caused environmental pollution. It has drawn enormous attention and research interests in the study of antibiotics removal from aqueous environments. Graphene, an interesting one-atom-thick, 2D single-layer carbon sheet with sp2 hybridized carbon atoms, has become an important agent for removal of antibiotic, owing to its unique physiochemical properties. Recently, a variety of graphene-based nanomaterials (GNMs) are reported to efficiently remove antibiotics from aqueous solutions by different technologies. In this review, we summarize different structure and properties of GNMs for the removal of antibiotics by adsorption. Meanwhile, advanced oxidation processes (AOPs), such as photocatalysis, Fenton process, ozonation, sulfate radical and combined AOPs by the aid of GNMs are summarized. Finally, the opportunities and challenges on the future scope of GNMs for removal of antibiotics from aqueous environments are proposed.
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Affiliation(s)
- Xuandong Wang
- School of Environment, Jinan University, Guangzhou, 510632, PR China
| | - Renli Yin
- School of Environment, Jinan University, Guangzhou, 510632, PR China
| | - Lixi Zeng
- School of Environment, Jinan University, Guangzhou, 510632, PR China
| | - Mingshan Zhu
- School of Environment, Jinan University, Guangzhou, 510632, PR China.
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Li MF, Liu YG, Zeng GM, Liu N, Liu SB. Graphene and graphene-based nanocomposites used for antibiotics removal in water treatment: A review. CHEMOSPHERE 2019; 226:360-380. [PMID: 30947046 DOI: 10.1016/j.chemosphere.2019.03.117] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 03/12/2019] [Accepted: 03/17/2019] [Indexed: 05/27/2023]
Abstract
Due to their extensive application in human and veterinary medicine, antibiotics have been found worldwide and studied as new pollutants in the aquatic environment. In order to remove such pollutants, adsorption and photocatalysis have attracted tremendous attention because of their great potential in antibiotics removal from aqueous solutions. Graphene, as a novel two-dimensional nanomaterial, possesses unique structure and physicochemical properties, which can be used to efficiently adsorb and photodegrade antibiotics. This review provides an overview of the adsorptive and catalytic properties of graphene, and recent advances in adsorption and photodegradation of antibiotics by graphene and its derivatives. The factors that affect the adsorption and photodegradation of antibiotics are reviewed and discussed. Furthermore, the underlying mechanisms of adsorption and photodegradation are summarized and analyzed. Meanwhile, statistical analysis is conducted based on the number of papers and the maximum adsorption and photodegradation ability on various antibiotics removal. Finally, some unsolved problems together with major challenges that exist in the fabrication and application of graphene-based nanocomposites and the development for antibiotics removal is also proposed. This work provides theoretical guidance for subsequent research in the field of adsorption and photocatalytic removal of antibiotics from aqueous solution, especially on influence factors and mechanisms aspects.
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Affiliation(s)
- Mei-Fang Li
- College of Environmental Science and Engineering, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China
| | - Yun-Guo Liu
- College of Environmental Science and Engineering, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China.
| | - Guang-Ming Zeng
- College of Environmental Science and Engineering, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China
| | - Ni Liu
- College of Environmental Science and Engineering, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Lushan South Road, Yuelu District, Changsha, 410082, PR China
| | - Shao-Bo Liu
- School of Metallurgy and Environment, Central South University, Lushan South Road, Yuelu District, Changsha, 410083, PR China; School of Architecture and Art, Central South University, Lushan South Road, Yuelu District, Changsha, 410083, PR China.
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Rajender G, Choudhury B, Giri PK. In situ decoration of plasmonic Au nanoparticles on graphene quantum dots-graphitic carbon nitride hybrid and evaluation of its visible light photocatalytic performance. NANOTECHNOLOGY 2017; 28:395703. [PMID: 28726671 DOI: 10.1088/1361-6528/aa810a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This work spotlights the development of a plasmonic photocatalyst showing surface plasmon induced enhanced visible light photocatalytic (PC) performance. Plasmonic Au nanoparticles (NPs) are decorated over the hybrid nanosystem of graphitic carbon nitride (GCN) and graphene quantum dots (GQD) by citrate reduction method. Surface plasmon resonance (SPR) induced enhancement of Raman G and 2D band intensity is encountered on excitation of the Plasmonic hybrid at 514.5 nm, which is near to the 532 nm absorption band of Au NPs. Time-resolved photoluminescence and XPS studies show charge transfer interaction between GQD-GCN and Au NPs. Plasmonic hybrid exhibits an enhanced PC activity over the other catalysts in the photodegradation of methylene blue (MB) under visible light illumination. Plasmonic photocatalyst displays more than 6 fold enhancement in the photodecomposition rate of MB over GQD and nearly 2 fold improvement over GCN and GQD-GCN. GQD-GCN absorbs mostly in the near visible region and can be photoexcited by visible light of wavelength ([Formula: see text]) < 460 nm. Plasmon activation in Au NPs decorated GQD-GCN could exploit the entire UV-visible light for photocatalysis. Furthermore, plasmonic Au act as antennas for accumulation and enhancement of localized electromagnetic field at the interface with GQD-GCN, and thereby promotes photogeneration of large numbers of carriers on GQD-GCN. The carriers are separated by charge transfer migration from hybrid to Au NPs. Finally, the carriers on the plasmonic Au nanostructures initiate MB degradation under visible light. Our results have shown that plasmon decoration is a suitable strategy to design a carbon based hybrid photocatalyst for solar energy conversion.
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Affiliation(s)
- Gone Rajender
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 39, India
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