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Construct α-FeOOH-Reduced Graphene Oxide Aerogel as a Carrier for Glucose Oxidase Electrode. MEMBRANES 2022; 12:membranes12050447. [PMID: 35629773 PMCID: PMC9146937 DOI: 10.3390/membranes12050447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 04/13/2022] [Accepted: 04/15/2022] [Indexed: 02/04/2023]
Abstract
A promising α-FeOOH-reduced graphene oxide aerogel (FeOOH-GA) has been prepared for the assembly of an enzyme electrode. The α-FeOOH-reduced graphene oxide aerogel was characterized by X-ray powder diffraction, field emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results reveal that graphene oxide is reduced by Fe2+ ion and α-FeOOH nanorods anchored on the reduced graphene oxide sheet through the Fe-O-C bond. Analyses using scanning electron microscopy and the Brunauer–Emmett–Teller method show that FeOOH-GA displays a various and interconnected pore structure. The FeOOH-GA was used as a support material on the glass carbon electrode (GCE) for glucose oxidase (GOD). Electrochemistry properties and bioelectrocatalytic activities of Nafion/GOD/FeOOH-GA/GCE were achieved from cyclic voltammetry and electrochemical impedance spectroscopy. The results show that Nafion/GOD/FeOOH-GA/GCE maintains outstanding catalytic activity and electrochemical properties. The FeOOH-GA could immobilize GOD through the hydrophobicity of the reduced graphene oxide and hydroxide radical of α-FeOOH. Appropriate α-FeOOH and diversified pore structure are beneficial for electron transfer, enzyme electrode storage, and interfacial electron transfer rate. All results indicated that the α-FeOOH-reduced graphene oxide aerogel as a carrier could effectively immobilize the tested enzyme.
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Lai SY, Ng KH, Cheng CK, Nur H, Nurhadi M, Arumugam M. Photocatalytic remediation of organic waste over Keggin-based polyoxometalate materials: A review. CHEMOSPHERE 2021; 263:128244. [PMID: 33297191 DOI: 10.1016/j.chemosphere.2020.128244] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/17/2020] [Accepted: 09/02/2020] [Indexed: 06/12/2023]
Abstract
Photocatalytic remediation of industrial water pollution has courted intense attention lately due to its touted green approach. In this respect, Keggin-based polyoxometalates (POMs) as green solid acids in photocatalytic reaction possess superior qualities, viz. unique photoinduced charge-transfer properties, strong photooxidative-photoreductive ability, high chemical and thermal stability, and so forth. Unfortunately, it suffers from a large bandgap energy, low specific surface area, low recoverability, and scarce utilization in narrow absorption range. Therefore, the pollutant degradation performance is not satisfactory. Consequently, multifarious research to enhance the photocatalytic performance of Keggin-based POMs were reported, viz. via novel modifications and functionalizations through a variety of materials, inclusive of, inter alia, metal oxides, transition metals, noble metals, and others. In order to advocate this emerging technology, current review work provides a systematic overview on recent advancement, initiated from the strategized synthetic methods, followed by hierarchical enhancement and intensification process, at the same time emphasizes on the fundamental working principles of Keggin-based POM nanocomposites. By reviewing and summarizing the efforts adopted global-wide, this review is ended with providing useful outlooks for future studies. It is also anticipated to shed light on producing Keggin-based POM nanocomposites with breakthrough visible- and solar-light-driven photocatalytic performance against recalcitrant organic waste.
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Affiliation(s)
- Sin Yuan Lai
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor Darul Ehsan, 43900, Malaysia; College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
| | - Kim Hoong Ng
- College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, PR China; College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
| | - Chin Kui Cheng
- Department of Chemical Engineering, College of Engineering, Khalifa University, P. O. Box 127788, Abu Dhabi, United Arab Emirates
| | - Hadi Nur
- Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, UTM, Skudai, Johor, 81310, Malaysia; Central Laboratory of Minerals and Advanced Materials, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Malang, 65145, Indonesia
| | - Mukhamad Nurhadi
- Department of Chemical Education, Universitas Mulawarman, Kampus Gunung Kelua, Samarinda, 75119, East Kalimantan, Indonesia
| | - Mahashanon Arumugam
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor Darul Ehsan, 43900, Malaysia; College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China; Department of Petroleum Technology and Alternative Fuels, Faculty of Environmental Technology, UCT, Prague, Technická 5, 160 00, Praha 6-Dejvice, Czechia
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Huangfu X, Xu N, Yang J, Yang H, Zhang M, Ye Z, Wang S, Chen J. Transport and retention of hydrochar-diatomite nanoaggregates in water-saturated porous sand: Effect of montmorillonite and phosphate at different ionic strengths and solution pH. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 703:134487. [PMID: 31726294 DOI: 10.1016/j.scitotenv.2019.134487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 09/14/2019] [Accepted: 09/15/2019] [Indexed: 06/10/2023]
Abstract
Hydrochar, a solid hydrate with a high energy density, is produced by hydrothermal carbonization of lignocellulosic biomass and is widely applied in agriculture as a soil amendment. The fate and transport of hydrochar when applied to soil need to be investigated. The major components of soil, clay and phosphate, likely interact with hydrochar in the subsurface. This study investigated the cotransport behavior of hydrochar and diatomite (D) through water-saturated quartz sand in the presence of montmorillonite (M) and/or phosphate in NaCl (1-50 mM) solutions at pH 6.0 and 9.0. The transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images and zeta potential (ZP) results showed that hydrochar-D nanoaggregates formed preferentially due to surface charge heterogeneity. M inhibited the transport of hydrochar-D in sand columns regardless of the solution pH mainly because the organo-mineral clusters of hydrochar-D with M were prone to filling the pores of the sand medium. Moreover, fine M particles preferentially attached to sand could decrease the ZP of the sand surface and subsequently decrease the repulsive forces between hydrochar-D and sand. The copresence of M and phosphate slightly facilitated hydrochar-D transport at pH 6.0 due to phosphate adsorption, whereas a negligible effect on transport occurred at pH 9.0. Thus, phosphate played a predominant role in the transport of hydrochar when clays were also present. A two-site kinetic retention model suggested that k1d/k1 and k2 are responsible for hydrochar-clay aggregate deposition in sand. Our findings relate to the potential risks posed by hydrochar in subsurface soils and aquifers where clay and phosphate ubiquitously co-occur.
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Affiliation(s)
- Xinxing Huangfu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Nan Xu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
| | - Jing Yang
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Han Yang
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Mo Zhang
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Zhi Ye
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Shiqi Wang
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Jianping Chen
- Jiangsu Province Key Laboratory of Intelligent Building Efficiency, Suzhou University of Science and Technology, Suzhou 215009, China
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Zhao W, Liang C, Wang B, Xing S. Enhanced Photocatalytic and Fenton-like Performance of CuO x-Decorated ZnFe 2O 4. ACS APPLIED MATERIALS & INTERFACES 2017; 9:41927-41936. [PMID: 29135218 DOI: 10.1021/acsami.7b14799] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A series of CuOx-decorated ZnFe2O4 samples were prepared by a hydrothermal method and investigated as a catalyst for the photocatalytic and Fenton-like degradation of Orange II. The active species and catalyst active sites in the two processes were also studied. It was found that the introduced CuOx significantly enhanced the photocatalytic and Fenton-like performance of ZnFe2O4. Especially, ZnFe2O4-Cu3 prepared with the Cu/Zn ratio of 3:7 exhibited a very high Fenton-like activity in the pH range 5-9. The enhanced photocatalytic activity of ZnFe2O4-Cu3 could be because the formed ZnFe2O4/Cu2O heterojunction improved the separation efficiency of the photogenerated carriers. The photogenerated hole was responsible for Orange II degradation. As for the Fenton-like reaction, •O2- was the active species, and the surface ≡Cu2+ with a higher redox ability should be the active site for H2O2 activation despite its lower surface content than that of ≡Cu+, ≡Fe2+, and ≡Fe3+. Finally, a possible pathway for Orange II degradation was proposed according to the liquid chromatography-mass spectrometry result.
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Affiliation(s)
- Wei Zhao
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Sciences, Hebei Normal University , Shijiazhuang 050024, China
| | - Chuan Liang
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Sciences, Hebei Normal University , Shijiazhuang 050024, China
| | - Beibei Wang
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Sciences, Hebei Normal University , Shijiazhuang 050024, China
| | - Shengtao Xing
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Material Sciences, Hebei Normal University , Shijiazhuang 050024, China
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