Designing Green Chemistry Experiments：Feasibility of Fenton Reagent as an Oxidant on Dyes

• Main Authors: Hua-Kwang Lee, 李華光
• Other Authors: Hwa-Kwang Yak
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/engjs9

碩士 === 中原大學 === 化學研究所 === 99 === The goal of this study is to develop a protocol for promoting the concept of green chemistry to college students. We designed the degradation products that they do not persist in the environment. We used the solvent in this system by water to reduces the toxicity in the environment. The most suitable protocol was tested by evaluating the non-photochemical process (Fenton, Fenton-like) in removing two of the commonly used dyes, Crystal Violet (CV) and Acid Blue 1 (AB1). The colorimetric process is applied to evaluate the outcome in this protocol. Experimental parameters were analyzed by Taguchi orthogonal arrays. Evaluation of the effect of pH and molarity ratio of Fenton (FeSO4/H2O2)、Fenton-like (Fe(NO3)3/H2O2) and then coupled with UV/Vis spectrophotometer was used to detect the removal efficiency and chemical kinetics of the sample. Results showed that pH played an important role in this system. At the pH=3, the reaction was finished for 10 minute. For CV the ideal pH for FeSO4/H2O2 (0.5 mM：50 mM) and Fe(NO3)3/H2O2 (1 mM：50 mM) was about 4 with a concentration of 50mM. Another dye, Acid Blue 1, was chosen to test the reactivity of Fenton reagent. Identical experiments parameters as for CV were applied and the optimal pH was found to be 4, with 50 mM of AB1, and FeSO4/H2O2 = 0.5：50. With these terms, color changed could be observed readily.