ZnCo2O4-ZnO S-Scheme Heterojunction for Photocatalytic Degradation of Cefalexin and Antimicrobial Properties
Junyu Lu , Yunshu Lu , Pitcheri Rosaiah , Shu Lin , Zada Amir , Kezhen Qi
Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (4) : 799 -811.
ZnCo2O4-ZnO S-Scheme Heterojunction for Photocatalytic Degradation of Cefalexin and Antimicrobial Properties
To identify an efficient photocatalyst for the removal of Escherichia coli (E. coli) contamination, ZnO was sythesized via a hydrothermal method. A series of nanocomposites with varying mass ratios (ZnCo2O4-ZnO) was fabricated by anchoring ZnCo2O4 onto ZnO using an in-situ growth technique, with the objective of enhancing ZnO’s photocatalytic performance. The resulting S-scheme heterojunction ZnCo2O4-ZnO materials were systematically characterized for their crystalline structures and photoelectrochemical properties, and evaluated for their of E. coli inactivation efficiency under visible light irradiation. The synthesized ZnO exhibited a hexagonal zincite phase, whereas ZnCo2O4 was confirmed to be a spinel phase. The enhanced light absorption and charge carrier transfer efficiency of ZnCo2O4-ZnO contributed to superior photocatalytic activity. The influence of the mass ratio of ZnCo2O4-ZnO on the antimicrobial performance was thoroughly investigated. At an optimal mass ratio of ZnCo2O4:ZnO=1:20, a maximum E. coli inhibition efficiency of 92.64% was achieved. Moreover, the photocatalytic degradation efficiency of cefalexin (CEX) using 10 mg of 5%ZnCo2O4-ZnO reached 61.13%, representing a 43.97% improvement over the 17.16% degradation achieved with pristine ZnO. These findings demonstrated that the ZnCo2O4-ZnO composite exhibits markedly enhanced photocatalytic and antimicrobial activity compared to ZnO.
ZnO / ZnCo2O4 / Photocatalysis / Antibacterial activity / Cephalexin (CEX) degradation
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Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH
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