非晶态MoS_(X)光芬顿高效去除盐酸四环素的研究

Study on photo-Fenton-like activity of amorphous MoS_(X)for high-efficient removal of tetracycline hydrochloride

MoS_(2)作为一种新型的类芬顿试剂经常被用于有机废水的去除。然而MoS_(2)的活性位点仅存在于边缘硫,基面均为没有活性的惰性硫,导致其活化过氧化氢(H_(2)O_(2))的能力有限。一种利用油浴加热法制备的非晶态MoS_(X)(X=2~3)催化剂,可以实现对H_(2)O_(2)的高效活化。相对于MoS_(2),MoS_(X)暴露出丰富的硫活性位点,不仅提高了污染物在水溶液中的吸附能力,同时为激活H_(2)O_(2)提供了丰富的活性位点。MoS_(X)在40min内对盐酸四环素的降解率达到91.54%,远高于MoS_(2)的37.54%。捕获剂实验表明,MoS_(X)在光类芬顿体系TC污染物的活性物种包括·OH、·O_(2)^(-)和h^(+),其·OH起到主导作用。此外,MoS_(X)催化剂还表现出良好的循环稳定性,5次实验后降解率仍达到86.78%。

MoS_(2)is often used as a novel Fenton-like reagent for the removal of organic matter from wastewater.However,the active sites of MoS_(2)are only present in the edge sulfur,and the base surface is inactive inert sulfur,resulting in its limited ability to activate hydrogen peroxide(H_(2)O_(2)).An amorphous MoS_(X)(X=2~3)catalyst was prepared by oil bath heating method and could efficiently activate H_(2)O_(2).Compared to MoS_(2),MoS_(X)exposed more sulfur active sites,which not only improved the adsorption capacity of contaminants in aqueous solution,but also provided abundant active sites for activating H_(2)O_(2).The degradation rate of tetracycline hydrochloride(TC)by MoS_(X)in 40min reached 91.54%,which was much higher than 37.54%of MoS_(2).The trap tests showed that the active species of MoS_(X) in the photo-Fenton-like TC contaminants system include·OH,·O_(2)^(-) and h^(+),and the·OH played a major role.In addition,the MoS_(X) catalyst also showed excellent cycling stability,and the degradation rate still reached 86.78%after five experiments.