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Dye degradation by green heterogeneous Fenton catalysts prepared in presence of Camellia sinensis.
J Environ Manage. 2017 Feb 01; 187:82-88.JE

Abstract

This work describes the synthesis and characterization of supported green iron catalysts, prepared with Camellia sinensis tea extract, and their application in heterogeneous Fenton degradation of pollutant dyes. The influence of the catalyst synthesis conditions in the iron and organic content were investigated by X-ray fluorescence and thermogravimetric analyses. Irregular, chain-like nanoparticles, in the size range of 20-100 nm, capped by polyphenolic natural compounds, were visualized by TEM micrographs. TEM-EDS revealed a high iron content in the nanoparticles as well as a high carbon content all over the catalyst surface, indicating the coverage by the polyphenolic compounds of the tea. X-ray powder diffraction revealed the amorphous nature of the nanoparticles, tentatively ascribed to iron(II)/(III) oxides and oxohydroxides composites. The Fenton degradation of different dyes was successfully accomplished, leading to complete decolourization in less than 3 h of reaction. Influence of hydrogen peroxide concentration, catalyst dosage, pH, temperature and catalyst support, were investigated. The catalysts prepared with black tea over silica furnished the higher iron contents and were the most actives for dye degradation.

Authors+Show Affiliations

Universidade do Estado do Rio de Janeiro, Instituto de Química, Rua São Francisco Xavier, 524, Edifício Haroldo Lisboa da Cunha, IQ, Room 312a, Maracanã, 20550-013, Rio de Janeiro, RJ, Brazil.Universidade do Estado do Rio de Janeiro, Instituto de Química, Rua São Francisco Xavier, 524, Edifício Haroldo Lisboa da Cunha, IQ, Room 312a, Maracanã, 20550-013, Rio de Janeiro, RJ, Brazil. Electronic address: nakedia@uerj.br.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27883942

Citation

Carvalho, Samira S F., and Nakédia M F. Carvalho. "Dye Degradation By Green Heterogeneous Fenton Catalysts Prepared in Presence of Camellia Sinensis." Journal of Environmental Management, vol. 187, 2017, pp. 82-88.
Carvalho SSF, Carvalho NMF. Dye degradation by green heterogeneous Fenton catalysts prepared in presence of Camellia sinensis. J Environ Manage. 2017;187:82-88.
Carvalho, S. S. F., & Carvalho, N. M. F. (2017). Dye degradation by green heterogeneous Fenton catalysts prepared in presence of Camellia sinensis. Journal of Environmental Management, 187, 82-88. https://doi.org/10.1016/j.jenvman.2016.11.032
Carvalho SSF, Carvalho NMF. Dye Degradation By Green Heterogeneous Fenton Catalysts Prepared in Presence of Camellia Sinensis. J Environ Manage. 2017 Feb 1;187:82-88. PubMed PMID: 27883942.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dye degradation by green heterogeneous Fenton catalysts prepared in presence of Camellia sinensis. AU - Carvalho,Samira S F, AU - Carvalho,Nakédia M F, Y1 - 2016/11/22/ PY - 2016/09/08/received PY - 2016/11/12/revised PY - 2016/11/14/accepted PY - 2016/11/25/pubmed PY - 2017/4/22/medline PY - 2016/11/25/entrez KW - Dye removal KW - Fenton system KW - Iron nanoparticles KW - Plant extract SP - 82 EP - 88 JF - Journal of environmental management JO - J Environ Manage VL - 187 N2 - This work describes the synthesis and characterization of supported green iron catalysts, prepared with Camellia sinensis tea extract, and their application in heterogeneous Fenton degradation of pollutant dyes. The influence of the catalyst synthesis conditions in the iron and organic content were investigated by X-ray fluorescence and thermogravimetric analyses. Irregular, chain-like nanoparticles, in the size range of 20-100 nm, capped by polyphenolic natural compounds, were visualized by TEM micrographs. TEM-EDS revealed a high iron content in the nanoparticles as well as a high carbon content all over the catalyst surface, indicating the coverage by the polyphenolic compounds of the tea. X-ray powder diffraction revealed the amorphous nature of the nanoparticles, tentatively ascribed to iron(II)/(III) oxides and oxohydroxides composites. The Fenton degradation of different dyes was successfully accomplished, leading to complete decolourization in less than 3 h of reaction. Influence of hydrogen peroxide concentration, catalyst dosage, pH, temperature and catalyst support, were investigated. The catalysts prepared with black tea over silica furnished the higher iron contents and were the most actives for dye degradation. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/27883942/Dye_degradation_by_green_heterogeneous_Fenton_catalysts_prepared_in_presence_of_Camellia_sinensis_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(16)30914-8 DB - PRIME DP - Unbound Medicine ER -