Solar expedited photodegradation of orange-g using H2O2

IF 0.9 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
R. Raja, A. R. Venis, C. Kalaivanan, R. Padmavathi
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Abstract

Decolourisation and degradation of azo dye Orange G was carried out by using the solarassisted photodegradation process using H2O2 and the effect of various parameters on decolourisation and degradation were analysed. Dye solutions of concentration 100 mg/L treated with 30% H2O2 were taken in 250 ml conical flasks and they were exposed to sunlight in the lux intensity range of 60,000 to 90,000 lux to study its decolourisation and degradation. Effect of various parameters on decolourisation and degradation of dye like the effect of initial pH, the effect of initial H2O2concentration, the effect of initial dye concentration, the effect of additives like chloride and dihydrogen phosphate of concentration 1 M, the effect of solar light intensity, the effect of temperature were studied as kinetic studies. Optimum pH was found to be 11 and optimum H2O2 concentration was found to be 250 mM to achieve 100 % decolourisation of the dye within the shortest time duration of 1.5 hours. Kinetic studies done on the effect of pH and the effect of H2O2 concentration also provided evidence for that. Effect of chloride ion has lead to enhancement in the rate of decolourisation whereas addition of dihydrogen phosphate ion inhibits the rate of decolourisation. An increase in solar light intensity has lead to increase in the rate of decolourisation. An increase in temperature has lead to increase in the rate of decolourisation. UV spectrum was taken for the dye and degraded dye to study the extent of degradation of the dye. COD and TOC removal were also studied to know about the mineralisation of the dye.
太阳能加速H2O2对橙g的光降解
采用H2O2辅助光降解法对偶氮染料橙G进行脱色降解,并分析了各参数对脱色降解的影响。取浓度为100 mg/L的染料溶液,经30% H2O2处理,置于250 ml锥形烧瓶中,在6万~ 9万勒克斯的光照强度范围内,研究其脱色和降解。考察了初始pH、初始h2o2浓度、初始染料浓度、氯离子和浓度为1 M的磷酸二氢等添加剂、太阳光照强度、温度等对染料脱色降解的影响,并进行了动力学研究。最佳pH值为11,最佳H2O2浓度为250 mM,可在最短时间(1.5小时)内实现染料100%脱色。对pH和H2O2浓度影响的动力学研究也提供了证据。氯离子的作用使脱色率提高,而磷酸二氢离子的加入抑制了脱色率。太阳光照强度的增加导致脱色率的增加。温度升高导致脱色速度加快。对染料和降解染料进行紫外光谱分析,研究染料的降解程度。还研究了COD和TOC的去除情况,以了解染料的矿化情况。
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来源期刊
Journal of Optoelectronic and Biomedical Materials
Journal of Optoelectronic and Biomedical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
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