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Functional kaolin supported nanoscale zero-valent iron as a Fenton-like catalyst for the degradation of Direct Black G.
Chemosphere. 2017 Oct; 184:664-672.C

Abstract

Kaolin supported nanoscale zero-valent iron (K-nZVI) is synthesized and applied as the Fenton-like oxidation catalyst to degrade a model azo dye, Direct Black G (DBG). The characterization of K-nZVI by the high resolution transmission electronmicroscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Energy Diffraction Spectrum (EDS) and X-ray diffraction (XRD) show that kaolin as a support material not only reduces the aggregation of zero-valent iron (nZVI) but also facilitates the Fenton-like oxidation by increasing the local concentration of DBG in the vicinity of nZVI. Pseudo first-order and pseudo second-order kinetic models are employed to reveal the adsorption and degradation of the DBG using K-nZVI as the catalyst. A better fit with pseudo second-order model for the adsorption process and equal excellent fits with pseudo first-order and pseudo second-order models for the degradation process are observed; the adsorption process is found to be the rate limiting step for overall reactions. The adsorption, evaluated by isotherms and thermodynamic parameters is a spontaneous and endothermic process. High-performance liquid chromatography-mass spectrometry (LC-MS) analysis was used to test degraded products in the degradation of DGB by K-nZVI. A removal mechanism based on the adsorption and degradation is proposed, including (i) prompt adsorption of DBG onto the K-nZVI surface, and (ii) oxidation of DBG by hydroxyl radicals at the K-nZVI surface. The application of K-nZVI to treat real wastewater containing azo dyes shows excellent degradation efficiency.

Authors+Show Affiliations

Postdoctoral Programme in Chemistry, Fujian Normal University, Fuzhou, Fujian, 350007, China; Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, China.Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, China.Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, China.Postdoctoral Programme in Chemistry, Fujian Normal University, Fuzhou, Fujian, 350007, China; Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, China; Global Centre for Environmental Remediation, University of Newcastle, Callaghan, NSW, 2308, Australia. Electronic address: Zuliang.chen@newcastle.edu.au.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28628903

Citation

Lin, Jiajiang, et al. "Functional Kaolin Supported Nanoscale Zero-valent Iron as a Fenton-like Catalyst for the Degradation of Direct Black G." Chemosphere, vol. 184, 2017, pp. 664-672.
Lin J, Sun M, Liu X, et al. Functional kaolin supported nanoscale zero-valent iron as a Fenton-like catalyst for the degradation of Direct Black G. Chemosphere. 2017;184:664-672.
Lin, J., Sun, M., Liu, X., & Chen, Z. (2017). Functional kaolin supported nanoscale zero-valent iron as a Fenton-like catalyst for the degradation of Direct Black G. Chemosphere, 184, 664-672. https://doi.org/10.1016/j.chemosphere.2017.06.038
Lin J, et al. Functional Kaolin Supported Nanoscale Zero-valent Iron as a Fenton-like Catalyst for the Degradation of Direct Black G. Chemosphere. 2017;184:664-672. PubMed PMID: 28628903.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Functional kaolin supported nanoscale zero-valent iron as a Fenton-like catalyst for the degradation of Direct Black G. AU - Lin,Jiajiang, AU - Sun,Mengqiang, AU - Liu,Xinwen, AU - Chen,Zuliang, Y1 - 2017/06/12/ PY - 2017/02/15/received PY - 2017/05/21/revised PY - 2017/06/11/accepted PY - 2017/6/20/pubmed PY - 2017/10/11/medline PY - 2017/6/20/entrez KW - Degradation KW - Direct Black G KW - Fenton-like reaction KW - Kaolin supported nZVI particles SP - 664 EP - 672 JF - Chemosphere JO - Chemosphere VL - 184 N2 - Kaolin supported nanoscale zero-valent iron (K-nZVI) is synthesized and applied as the Fenton-like oxidation catalyst to degrade a model azo dye, Direct Black G (DBG). The characterization of K-nZVI by the high resolution transmission electronmicroscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Energy Diffraction Spectrum (EDS) and X-ray diffraction (XRD) show that kaolin as a support material not only reduces the aggregation of zero-valent iron (nZVI) but also facilitates the Fenton-like oxidation by increasing the local concentration of DBG in the vicinity of nZVI. Pseudo first-order and pseudo second-order kinetic models are employed to reveal the adsorption and degradation of the DBG using K-nZVI as the catalyst. A better fit with pseudo second-order model for the adsorption process and equal excellent fits with pseudo first-order and pseudo second-order models for the degradation process are observed; the adsorption process is found to be the rate limiting step for overall reactions. The adsorption, evaluated by isotherms and thermodynamic parameters is a spontaneous and endothermic process. High-performance liquid chromatography-mass spectrometry (LC-MS) analysis was used to test degraded products in the degradation of DGB by K-nZVI. A removal mechanism based on the adsorption and degradation is proposed, including (i) prompt adsorption of DBG onto the K-nZVI surface, and (ii) oxidation of DBG by hydroxyl radicals at the K-nZVI surface. The application of K-nZVI to treat real wastewater containing azo dyes shows excellent degradation efficiency. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/28628903/Functional_kaolin_supported_nanoscale_zero_valent_iron_as_a_Fenton_like_catalyst_for_the_degradation_of_Direct_Black_G_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(17)30940-2 DB - PRIME DP - Unbound Medicine ER -