Cadmium sulfide cage photocatalysis coupled electroactive biofilm for synergistic promotion of tetracycline degradation and electricity production  

作　　者：Z.S.Yuan J.X.Zou X.L.Zhao J.Y.Shi C.S.Guo M.Yan 

机构地区：[1]School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Journal of Materials Science & Technology》2023年第35期86-97,共12页材料科学技术（英文版）

基　　金：This work was supported by Natural Science Foundation of Hei-longjiang Province(No.LH2022E050);Interdisciplinary Research Foundation of HIT(No.IR2021215);the National Natural Sci-ence Foundation of China(No.52172278).

摘　　要：Tetracycline(TC)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face water.It becomes a great threat to the ecological environment.Here,a device of photocatalysis as-sisted microbial fuel cell(photo-MFC)was constructed for TC degradation and energy recovery.In this photo-MFC,cadmium sulfide(CdS)cage photocatalysis can degrade most of TC in a short time.While the Co_(3)O_(4)@C-CC(carbonization and calcination of the ZIF-67 precursor in-situ grown on the carbon cloth(CC))bioanode degrades the rest of TC as well as the photocatalytic products,thus improving the miner-alization.The co-existence of photocatalysis with bioanode changes the microbial community structure of the biofilms.The dominant phylum is Geobacter(60.2%)in normal MFC while that in photo-MFC are Pro-teobacteria(43.5%)and Geobacter(33.2%).Therefore,the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand(COD)removal of 98.6%,which is higher than that of normal MFC(77.6%)or single CdS cage photocatalysis(23.8%).In addition,the photogenerated electrons can be transferred to the cathode,which reduces their combination with holes and increases the electricity generation of MFC,achieving a maximum power density of 3.37 W/m^(2).After degradation,the effluent with 200 mg L^(−1) TC exhibits no visible biotoxity.Furthermore,electrochemical test,finite-difference time-domain(FDTD),density functional theory(DFT)calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this photo-MFC.This strat-egy paves a new way for low energy consumption removal and energy recovery of organic pollutants.

关 键 词：Photo-MFC CdS cage Tetracycline degradation MINERALIZATION Electricity production 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X701[环境科学与工程—环境工程]