β-环糊精对甲基橙紫外光脱色的影响

Effect of β-Cyclodextrin on the UV Decolorization of Methyl Orange

用紫外光谱法研究了β-环糊精(β-CD)对紫外光照射下甲基橙脱色的影响. 结果表明,由于β-CD能包合甲基橙形成β-CD/甲基橙包合物,抑制了紫外光对甲基橙的光脱色,此抑制作用在pH为6～10范围内较大,pH=8时达最大. 在温度为4×10-4 mol/L的β-CD和5×10-5 mol/L的甲基橙包合物溶液光照3 h,溶液的脱色率是单一甲基橙溶液脱色率的60%.

The influence of β-cyclodextrin （β-CD） on the photocatalytic decolorization of methyl orange solution under ultraviolet irradiation was studied by UV-Vis spectral analysis. The photocatalytic decolorization rate of the methyl orange solution was found to decrease with the addition of β-CD. The suppression of the methyl orange decolorization by β-CD was significant at pH 6 - 10, and maximized at pH = 8. At 3 h irradiation, the decolorization rate of a 5 × 10^-5 mol/L methyl orange solution containing 4 × 10^ -4 mol/L β-CD was 3/5 that of a blank methyl orange solution.