Mechanism of microbial coupling CdS photocatalytic degradation of sulfamethoxazole

doi:10.19965/j.cnki.iwt.2021-1306

Industrial Water Treatment ›› 2022, Vol. 42 ›› Issue (6): 67-73. doi: 10.19965/j.cnki.iwt.2021-1306

• SPECIAL ISSUE ON SUSTAINABLE DEVELOPMENT OF SEWAGE TREATMENT • Previous Articles Next Articles

Mechanism of microbial coupling CdS photocatalytic degradation of sulfamethoxazole

Quanlin CHEN¹(), Jingwen LIANG¹, Cuiping ZENG², Guangli LIU¹, Renduo ZHANG¹, Haiping LUO¹()

^1. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology，School of Environmental Science and Engineering，Sun Yat-sen University，Guangzhou 510006，China
^2. CAS Key Laboratory of Quantitative Engineering Biology，Shenzhen Institute of Synthetic Biology，Shenzhen Institute of Advanced Technology，Chinese Academy of Sciences，Shenzhen 518055，China

Received:2022-02-08 Online:2022-06-20 Published:2022-06-22

微生物耦合CdS光催化降解磺胺甲唑的机理研究

陈泉林¹(), 梁競文¹, 曾翠平², 刘广立¹, 张仁铎¹, 骆海萍¹()

^1. 中山大学环境科学与工程学院，广东省环境污染控制与修复技术重点实验室，广东广州 510006
^2. 中国科学院深圳先进技术研究院，深圳合成生物学创新研究院，中国科学院定量工程生物学重点实验室，广东深圳 518055

作者简介:
陈泉林（1997— ），硕士。电话：18860366397，E-mail：chenqlin5@mail2.sysu.edu.cn
骆海萍，副教授。E-mail：luohp5@mail.sysu.edu.cn。
基金资助:
国家自然科学基金项目(42077286); 中央高校基本科研业务费重点培育项目(19lgzd27)

Abstract

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

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

CLC Number:

X703.1

Quanlin CHEN, Jingwen LIANG, Cuiping ZENG, Guangli LIU, Renduo ZHANG, Haiping LUO. Mechanism of microbial coupling CdS photocatalytic degradation of sulfamethoxazole[J]. Industrial Water Treatment, 2022, 42(6): 67-73.

陈泉林, 梁競文, 曾翠平, 刘广立, 张仁铎, 骆海萍. 微生物耦合CdS光催化降解磺胺甲唑的机理研究[J]. 工业水处理, 2022, 42(6): 67-73.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-1306

https://www.iwt.cn/EN/Y2022/V42/I6/67

Figures/Tables 8

Fig. 1 SEM（a），（b）and EDS（c），（d）of the system coupling homoacetogenic bacteria and CdS

Fig. 2 XRD of the system coupling homoacetogenic bacteria and CdS before and after the degradation of SMX

Fig. 3 Degradation efficiency of SMX in the system coupling homoacetogenic bacteria and CdS under different conditions

Fig. 4 The influence of CdS concentration on the degradation efficiency and reaction rate of SMX

Fig. 5 Possible degradation pathways of SMX by the role of homoacetogenic mixed cultures

Fig. 6 Possible degradation pathways of SMX by the role of CdS photocatalysis

Fig. 7 Variation of the abundance of degradation products of SMX with time in the microbial coupled photocatalytic system

Fig. 8 Variation of the abundance of photocatalytic degradation products of SMX with time under different conditions

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