碲化镉量子点光催化降解溴化乙锭的研究

以巯基乙酸为稳定剂, 水相合成出不同粒径的碲化镉量子点, 对其进行适当的光照处理, 以提升其光学性质和稳定性. 将其用作光催化剂, 以紫外灯为光源, 降解具有强诱变作用的常用核酸荧光染料——溴化乙锭. 考察了光照时间和溶液 pH 对降解率的影响. 以溴化乙锭在620 nm处的特征荧光发射峰为参数表征降解率, 在反应4 h后, 对15 mg/L溴化乙锭水溶液的降解率近90%, 同时, 对琼脂糖凝胶中的溴化乙锭也有降解作用.

Degradation of Ethidium Bromide Using CdTe Quantum Dots as Photo-catalysts

CdTe quantum dots (QDs) were prepared in an aqueous solution using thioglycollic acid as a stabilizing agent. After an appropriate illumination and storage, the photoluminescence (PL) and stability of the CdTe nanoparticles were enhanced. Then the water-soluble and highly stable QDs were used as a photo-catalyzer for the degradation of ethidium bromide (EB). Factors that concern fluorescent CdTe with a photocatalysis reaction including pH and irradiation time were investigated. Absorption of the photocatalysis reaction mixture suggested the decolorization of EB. Effect on the relative fluorescence intensity of EB shows that the rate of degradation can be 90% in water after 4 h under UV irradiation. Moreover, CdTe QDs also worked in agarose gel, in which EB was used as an intercalating fluorescence probe for the recognition of nucleic acids.