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Degradation and mineralization of Direct Blue 71 in a circulating upflow reactor by UV/TiO2 process and employing a new method in kinetic study.
J Hazard Mater. 2007 Jun 01; 144(1-2):506-12.JH

Abstract

Direct Blue 71 (C(40)H(23)N(7)Na(4)O(13)S(4)), an azo dye with a high worldwide consumption and providing toxic effluents, can be highly degraded using TiO(2) catalyst suspension and irradiation with a UV-C lamp in a circulating upflow photo-reactor with no dead zone. An initial concentration of 50 mgL(-1) of dye, within the range of typical concentration in textile wastewaters, was used. The influence of catalyst concentration, pH and temperature were investigated. The results showed that degradation of this dye can be conducted in the both processes of only UV irradiation and UV/TiO(2); but with the aim of mineralization, the later process provides significantly better results. Accordingly, a degradation of more than 97% of dye was achieved by applying the optimal operational parameters with 40 mgL(-1) of catalyst, natural pH and 45 degrees C, during 120 min irradiation. A removal of about 50% of COD could also be obtained at the same time. In kinetic investigations, the effect of catalyst particles' turbidity was taken into account and the rate of degradation of the dye, under mild conditions, was expressed as the sum of the rates of individual photolysis and photocatalysis process branches, with mainly influence of the bulk hydroxyl radicals.

Authors+Show Affiliations

Department of Applied Chemistry, University of Bu-Ali Sina, Hamedan 65174, Iran. saien@basu.ac.irNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17134827

Citation

Saien, J, and A R. Soleymani. "Degradation and Mineralization of Direct Blue 71 in a Circulating Upflow Reactor By UV/TiO2 Process and Employing a New Method in Kinetic Study." Journal of Hazardous Materials, vol. 144, no. 1-2, 2007, pp. 506-12.
Saien J, Soleymani AR. Degradation and mineralization of Direct Blue 71 in a circulating upflow reactor by UV/TiO2 process and employing a new method in kinetic study. J Hazard Mater. 2007;144(1-2):506-12.
Saien, J., & Soleymani, A. R. (2007). Degradation and mineralization of Direct Blue 71 in a circulating upflow reactor by UV/TiO2 process and employing a new method in kinetic study. Journal of Hazardous Materials, 144(1-2), 506-12.
Saien J, Soleymani AR. Degradation and Mineralization of Direct Blue 71 in a Circulating Upflow Reactor By UV/TiO2 Process and Employing a New Method in Kinetic Study. J Hazard Mater. 2007 Jun 1;144(1-2):506-12. PubMed PMID: 17134827.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation and mineralization of Direct Blue 71 in a circulating upflow reactor by UV/TiO2 process and employing a new method in kinetic study. AU - Saien,J, AU - Soleymani,A R, Y1 - 2006/10/27/ PY - 2006/07/15/received PY - 2006/10/21/revised PY - 2006/10/23/accepted PY - 2006/12/1/pubmed PY - 2007/8/31/medline PY - 2006/12/1/entrez SP - 506 EP - 12 JF - Journal of hazardous materials JO - J Hazard Mater VL - 144 IS - 1-2 N2 - Direct Blue 71 (C(40)H(23)N(7)Na(4)O(13)S(4)), an azo dye with a high worldwide consumption and providing toxic effluents, can be highly degraded using TiO(2) catalyst suspension and irradiation with a UV-C lamp in a circulating upflow photo-reactor with no dead zone. An initial concentration of 50 mgL(-1) of dye, within the range of typical concentration in textile wastewaters, was used. The influence of catalyst concentration, pH and temperature were investigated. The results showed that degradation of this dye can be conducted in the both processes of only UV irradiation and UV/TiO(2); but with the aim of mineralization, the later process provides significantly better results. Accordingly, a degradation of more than 97% of dye was achieved by applying the optimal operational parameters with 40 mgL(-1) of catalyst, natural pH and 45 degrees C, during 120 min irradiation. A removal of about 50% of COD could also be obtained at the same time. In kinetic investigations, the effect of catalyst particles' turbidity was taken into account and the rate of degradation of the dye, under mild conditions, was expressed as the sum of the rates of individual photolysis and photocatalysis process branches, with mainly influence of the bulk hydroxyl radicals. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17134827/Degradation_and_mineralization_of_Direct_Blue_71_in_a_circulating_upflow_reactor_by_UV/TiO2_process_and_employing_a_new_method_in_kinetic_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(06)01290-8 DB - PRIME DP - Unbound Medicine ER -