期刊
ENVIRONMENTAL TECHNOLOGY
卷 34, 期 10, 页码 1247-1253出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2012.744431
关键词
advanced oxidation processes; AOPs; microwave; UV; H2O2; tartrazine; electrode-less discharge lamps; EDLs
资金
- National Council for Scientific and Technological Development (CNPq), Brazil
This study optimizes two factors, pH and initial [H2O2], in the ultraviolet (UV)/H2O2/microwave (MW) process through experimental design and assesses the effect of MWs on the colour removal of an azo-dye (tartrazine) solution that was favoured by an acidic pH. The estimated optimal conditions were: initial [H2O2]=2.0mmolL(-1) and pH=2.6, at 30 +/- 2 degrees C. We obtained colour removals of approximately 92% in 24 min of irradiation (EDL, 244.2 W), following zero order kinetics: k=(3.9 +/- 0.52)x10(-2) a.u. min(-1) and R-2=0.989. Chemical and biological oxygen demand were significantly removed. On the other hand, the carbon content, biodegradability and ecotoxicity (Lactuca sativa) remained approximately the same. The UV/H2O2/MW process was shown to be eight times faster than other tested processes (MW, H2O2, H2O2/MW, and UV/MW).
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