摘要：

通过在产乙酸混菌表面合成CdS，构建了微生物耦合CdS光催化系统，并考察了该系统对磺胺甲 唑（Sulfamethoxazole，SMX）的降解性能以及降解机理。结果表明，当CdS浓度为2 mmol/L、光照强度为50 mW时，耦合系统能够在24 h内实现对2 mg/L SMX的100%去除；相比之下，单一微生物体系和CdS光催化体系的SMX去除率分别为31%和27%。在CdS浓度为0.5~4.0 mmol/L条件下，耦合系统对SMX的去除率与CdS浓度呈现正相关关系。产物分析结果表明，与单一光催化或生物降解过程相比，微生物耦合光催化降解可促使SMX转化为结构简单的降解产物——3-氨基异 唑。

关键词: 微生物, 硫化镉, 耦合光催化系统, 磺胺甲唑

Abstract:

A microbe-coupled CdS photocatalytic system was constructed by synthesizing CdS on the cell surface of acetogenic mixed culture，and its degradation performance and mechanism on sulfamethoxazole（SMX）were investigated. The results showed that the coupling system could achieve 100% removal of 2 mg/L SMX within 24 h，with the initial CdS concentration of 2 mmol/L and the light intensity of 50 mW. In comparison，SMX removal efficiency in the single acetogens or CdS photocatalysis were 31% and 27%，respectively. With the CdS concentration ranged in 0.5-4.0 mmol/L，the removal rate of SMX in the coupled system was positively correlated with the CdS concentration. The product analysis results showed that compared with a single photocatalytic or biodegradation process，the microbial coupling photocatalytic degradation could promote the conversion of SMX into a simple structure degradation product：3-aminoisoxazole.

Key words: microorganism, CdS, coupled photocatalytic system, sulfamethoxazole

中图分类号: 

• X703.1