S-scheme ZnO/MoS_(2)异质结构筑与对盐酸四环素降解性能

The S-Scheme ZnO/MoS_(2) heterostructure preparation and degradation performance of tetracycline hydrochloride

抗生素药物使用范围广且用量大,导致大量抗生素废水进入水体或者残留在土壤环境中,对人类健康造成威胁,然而传统工艺对其去除效果并不理想.以ZnO为基底,通过掺杂MoS_(2),制备了S-scheme ZnO/MoS_(2)异质结复合材料,研究了该材料对抗生素废水的净化性能.通过调节复合材料中ZnO含量、光照条件、盐酸四环素浓度等,探讨了ZnO/MoS_(2)复合材料对不同浓度盐酸四环素(tetracycline hydrochloride,TC)废水的净化效果.结果表明:在光照条件下,催化剂复合比为1∶1的ZnO/MoS_(2)复合材料对60 mg·L^(-1)四环素废水的降解效率可达88%(pH=7,105 min);电子传递与污染物降解机理研究表明,电子由ZnO导带迁移至MoS_(2)价带,形成S-scheme异质结,从而有效提高了催化效率与污染物降解性能.

The wide range and large dosage of antibiotic drugs led to a large amount of antibiotic wastewater entering water body or remaining in soil environment,which posed a threat to human health.However,the removal effect of antibiotics by traditional processes was not ideal.In this study,S-Scheme ZnO/MoS_(2)heterojunction composite was prepared by doping MoS_(2)with ZnO as the substrate,and the purification performance of the material on antibiotic wastewater was explored.The purification effect of ZnO/MoS_(2)composite material on tetracycline hydrochloride(TC)wastewater with different concentrations was investigated by adjusting the ZnO content,illumination conditions and tetracycline hydrochloride concentration in the composite material.The results showed that the degradation efficiency of 60 mg·L^(-1)tetracycline wastewater is 88%(pH=7105 min)when the catalyst composite ratio of ZnO/MoS_(2)composite material is 1∶1 under light condition.The study of the mechanism of electron transport and pollutant degradation showed that electrons migrate from ZnO conduction band to MoS_(2)valence band to form S-scheme heterojunction,which effectively improves the catalytic efficiency and pollutant degradation performance.