中心复合设计优化刚果红光催化降解

S. A. Idrees, Myasar Khalil Ibrahim
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引用次数: 4

摘要

研究了氧化锌、H2O2悬浮液中氧化剂和半导体光催化降解刚果红的性能。这项工作是在RSM(表面响应方法学)的协助下完成的,用于实验设计和统计计算。所有光化学实验均在石英光电池中进行,实验所用溶剂均为蒸馏水,通过统计分析研究了过氧化氢H2O2、氧化锌和染料浓度对光化学实验的影响。本工作中实验使用的仪器是分光光度计,为了找到计算出的然后预测的降解百分比,方差分析等统计参数也进行了测量。结果表明,所有实验的p值都高于0.05的置信水平,这意味着本工作的参数对降解百分比没有意义。这可能是由于过氧化氢(H2O2)可以作为氧气提供者加速光降解过程。同时,过量的H2O2在矿化系统中起到羟基自由基捕获的作用。另一方面;当刚果红浓度为10ppm、H2O2浓度为5%、ZnO浓度为0.1g/L时,降解效果最好,达到19%。
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Optimization of Congo-Red Photo-Catalytic Degradation by Central Composite Design
The photo catalytic degradation of Congo red by oxidant’s and semiconductors in suspension aqueous solution of ZnO, H2O2 has been studied. This work has been done by assist of RSM (surface response methodology) for design of experiments and statistical calculations. All photochemical experiments have been carried out in quartz photo cell and the solvent used for all experiment was distilled water (D. W). The influence of hydrogen peroxide H2O2, zinc oxide and dye concentration has been studied by statistical analysis. The instrument used for experiments in this work is spectrophotometer in order to find the calculated and then predicted percentage of degradation, ANOVA analysis and other statistical parameters also has been measured. The result shows that the P-values are higher than 0.05 confidence level in all experiments this means that the parameter of this work does not make a sense on percentage of degradation. This is may be due to that the hydrogen peroxide (H2O2) may work as oxygen provider to accelerate the photo degradation process. Meanwhile, Excess amount of H2O2, Could act as hydroxyl radical capture in the mineralization system. On the other hand; the best result was 19% degradation in case of 10ppm Congo red concentration, 5% H2O2 and 0.1g/L ZnO.
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