Tags

Type your tag names separated by a space and hit enter

UV light assisted decolorization of dark brown colored coffee effluent by photo-Fenton reaction.
Water Res. 2006 Dec; 40(20):3775-84.WR

Abstract

The photochemical decolorization of coffee effluent has been examined by photo-Fenton (UV/Fe2+/H2O2) process. Effects of UV light intensity, initial coffee concentration, iron dose and H2O2 dose on the color removal of model coffee effluent have been investigated. The rate of decolorization increased with decreasing initial coffee effluent concentration. It was found that the Fe ion dose and UV light intensity enhanced the decolorization rate. The decolorization process of coffee effluent could be divided into three established phases. At the beginning of the photo-Fenton process, the instantaneous and significant increase in color of the solution was found (Phase-I). In the subsequent phase (Phase-II), the decolorization rate was initially fast and subsequently decreased. In Phase-III, the rate was accelerated and then the complete decolorization of model coffee effluent was achieved. In order to elucidate the mechanisms of coffee effluent color removal process, the concentration changes in Fe3+ and Fe2+ besides H2O2 were measured during the course of the photo-Fenton process. The rate-determining step in Phase-II was the photo-Fenton reaction or photoreduction of Fe3+. On the other hand, the decolorization process in Phase-III was highly affected by Fenton reaction or decomposition of H2O2 with Fe2+. About 93% mineralization of 250 mg L(-1) model coffee effluent was achieved after 250 min. A comparative study for TiO2, ZnO and photo-Fenton oxidation processes has been also carried out and the photo-Fenton process was found to be the most effective for color removal of coffee effluent.

Authors+Show Affiliations

Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry, Toyo University, Kawagoe, Saitama 350-8585, Japan.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17028064

Citation

Tokumura, Masahiro, et al. "UV Light Assisted Decolorization of Dark Brown Colored Coffee Effluent By photo-Fenton Reaction." Water Research, vol. 40, no. 20, 2006, pp. 3775-84.
Tokumura M, Ohta A, Znad HT, et al. UV light assisted decolorization of dark brown colored coffee effluent by photo-Fenton reaction. Water Res. 2006;40(20):3775-84.
Tokumura, M., Ohta, A., Znad, H. T., & Kawase, Y. (2006). UV light assisted decolorization of dark brown colored coffee effluent by photo-Fenton reaction. Water Research, 40(20), 3775-84.
Tokumura M, et al. UV Light Assisted Decolorization of Dark Brown Colored Coffee Effluent By photo-Fenton Reaction. Water Res. 2006;40(20):3775-84. PubMed PMID: 17028064.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - UV light assisted decolorization of dark brown colored coffee effluent by photo-Fenton reaction. AU - Tokumura,Masahiro, AU - Ohta,Ayano, AU - Znad,Hussein T, AU - Kawase,Yoshinori, Y1 - 2006/10/09/ PY - 2006/03/01/received PY - 2006/08/08/revised PY - 2006/08/15/accepted PY - 2006/10/10/pubmed PY - 2007/3/1/medline PY - 2006/10/10/entrez SP - 3775 EP - 84 JF - Water research JO - Water Res VL - 40 IS - 20 N2 - The photochemical decolorization of coffee effluent has been examined by photo-Fenton (UV/Fe2+/H2O2) process. Effects of UV light intensity, initial coffee concentration, iron dose and H2O2 dose on the color removal of model coffee effluent have been investigated. The rate of decolorization increased with decreasing initial coffee effluent concentration. It was found that the Fe ion dose and UV light intensity enhanced the decolorization rate. The decolorization process of coffee effluent could be divided into three established phases. At the beginning of the photo-Fenton process, the instantaneous and significant increase in color of the solution was found (Phase-I). In the subsequent phase (Phase-II), the decolorization rate was initially fast and subsequently decreased. In Phase-III, the rate was accelerated and then the complete decolorization of model coffee effluent was achieved. In order to elucidate the mechanisms of coffee effluent color removal process, the concentration changes in Fe3+ and Fe2+ besides H2O2 were measured during the course of the photo-Fenton process. The rate-determining step in Phase-II was the photo-Fenton reaction or photoreduction of Fe3+. On the other hand, the decolorization process in Phase-III was highly affected by Fenton reaction or decomposition of H2O2 with Fe2+. About 93% mineralization of 250 mg L(-1) model coffee effluent was achieved after 250 min. A comparative study for TiO2, ZnO and photo-Fenton oxidation processes has been also carried out and the photo-Fenton process was found to be the most effective for color removal of coffee effluent. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/17028064/UV_light_assisted_decolorization_of_dark_brown_colored_coffee_effluent_by_photo_Fenton_reaction_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(06)00466-0 DB - PRIME DP - Unbound Medicine ER -