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Decolorization and mineralization of reactive dyes by a photocatalytic process using ZnO and UV radiation.
Water Sci Technol. 2012; 66(1):158-64.WS

Abstract

Reactive dyes are one of the major pollutants in textile wastewater and a concern because they are not easily degraded by conventional wastewater treatments. Heterogeneous photocatalysis has been considered an effective option for treating wastewater containing those dyes. This research work assesses the photocatalytic degradation of reactive dyes using UV irradiation and pure or impregnated ZnO. In addition to photocatalysis, separate photolysis and adsorption experiments were conducted but showed low efficiency. The dye degradation was monitored by UV-Vis spectroscopy and mineralization was determined by total organic carbon (TOC) analyses. Total color removal was achieved after 30 min of irradiation using pure ZnO. The Black 5 dye photocatalytic decolorization reaction followed first-order kinetics, while Yellow 145, Red 4 and Blue 21 dyes followed zero-order kinetics. TOC removals in the range of 70-80% were achieved after 240 min of individual photocatalytic treatment with ZnO. The performance of each photocatalyst was also compared when the four dyes were mixed together and the order of efficiency in the mineralization process was as follows: Fe/ZnO > ZnO > Co/ZnO. This result was explained by the crystal field theory.

Authors+Show Affiliations

Rio de Janeiro State University, Rio de Janeiro, Brazil. luraddi@uerj.brNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22678213

Citation

Almeida Guerra, Wilson N., et al. "Decolorization and Mineralization of Reactive Dyes By a Photocatalytic Process Using ZnO and UV Radiation." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 66, no. 1, 2012, pp. 158-64.
Almeida Guerra WN, Teixeira Santos JM, Raddi de Araujo LR. Decolorization and mineralization of reactive dyes by a photocatalytic process using ZnO and UV radiation. Water Sci Technol. 2012;66(1):158-64.
Almeida Guerra, W. N., Teixeira Santos, J. M., & Raddi de Araujo, L. R. (2012). Decolorization and mineralization of reactive dyes by a photocatalytic process using ZnO and UV radiation. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 66(1), 158-64. https://doi.org/10.2166/wst.2012.154
Almeida Guerra WN, Teixeira Santos JM, Raddi de Araujo LR. Decolorization and Mineralization of Reactive Dyes By a Photocatalytic Process Using ZnO and UV Radiation. Water Sci Technol. 2012;66(1):158-64. PubMed PMID: 22678213.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Decolorization and mineralization of reactive dyes by a photocatalytic process using ZnO and UV radiation. AU - Almeida Guerra,Wilson N, AU - Teixeira Santos,Joana M, AU - Raddi de Araujo,Lucia R, PY - 2012/6/9/entrez PY - 2012/6/9/pubmed PY - 2012/9/7/medline SP - 158 EP - 64 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci Technol VL - 66 IS - 1 N2 - Reactive dyes are one of the major pollutants in textile wastewater and a concern because they are not easily degraded by conventional wastewater treatments. Heterogeneous photocatalysis has been considered an effective option for treating wastewater containing those dyes. This research work assesses the photocatalytic degradation of reactive dyes using UV irradiation and pure or impregnated ZnO. In addition to photocatalysis, separate photolysis and adsorption experiments were conducted but showed low efficiency. The dye degradation was monitored by UV-Vis spectroscopy and mineralization was determined by total organic carbon (TOC) analyses. Total color removal was achieved after 30 min of irradiation using pure ZnO. The Black 5 dye photocatalytic decolorization reaction followed first-order kinetics, while Yellow 145, Red 4 and Blue 21 dyes followed zero-order kinetics. TOC removals in the range of 70-80% were achieved after 240 min of individual photocatalytic treatment with ZnO. The performance of each photocatalyst was also compared when the four dyes were mixed together and the order of efficiency in the mineralization process was as follows: Fe/ZnO > ZnO > Co/ZnO. This result was explained by the crystal field theory. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/22678213/Decolorization_and_mineralization_of_reactive_dyes_by_a_photocatalytic_process_using_ZnO_and_UV_radiation_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2012.154 DB - PRIME DP - Unbound Medicine ER -