化工进展2023，Vol.42Issue(11)：5908-5919,12.DOI:10.16085/j.issn.1000-6613.2023-0019
基于希瓦氏菌基因工程菌制备集成催化剂及光催化性能
Preparation and photocatalysis application of integrated nanocatalysts based on genetic engineering Shewanella oneidensis strain
摘要
Abstract
The genetic engineering Shewanella oneidensis(SO)strain was used as a biological template,to synthesize ternary SO/CdS/ZnO integrated photocatalysts,wherein,the recombinant SO strain could overexpress cysteine desulfurase for the extracellular growth of CdS nanoparticles by adding L-cysteine and cadmium ions,and zinc oxide nanoparticles were further loaded.The physicochemical properties of SO/CdS/ZnO photocatalysts were characterized by SEM,TEM,EDX,XRD,and XPS.The catalytic performance was evaluated in the photocatalytic degradation of organic dyes.The results showed that CdS and ZnO nanoparticles were uniformly loaded on the external surface of the recombinant SO strain.The as-prepared integrated nanocatalysts could effectively photodegrade organic dyes,and the amount of zinc source showed a significant effect on the degradation efficiency.When the amount of zinc acetate was 0.22g,the best photodegradation performance was achieved,e.g.,the photodegradation efficiency of organic dyes could reach 100% within 60min.Moreover,the ternary integrated nanocatalysts could be reused 5 times with more than 80% of the original photodegradation efficiency.It was found that CdS nanoparticles could produce photogenerated electrons and holes under light irradiation,while ZnO nanoparticles inhibited the recombination of e-and h+,and their synergistic effect improved the photodegradation efficiency.Accordingly,we provide a simple and feasible synthetic route for the multicomponent photocatalysts,and particularly we demonstrate that the assembly of semiconductor nanoparticles on the genetic engineering microorganisms as a platform has promising prospects in photocatalysis.关键词
生物模板/硫化镉/氧化锌/集成催化剂/基因工程菌Key words
biotemplate/cadmium sulphide/zinc oxide/integrated catalyst/genetic engineering bacteria分类
化学化工引用本文复制引用
刘亚,李静茹,蔡东仁,周树锋,王远鹏,詹国武,李清彪..基于希瓦氏菌基因工程菌制备集成催化剂及光催化性能[J].化工进展,2023,42(11):5908-5919,12.基金项目
国家自然科学基金(U21A20324,22038012). （U21A20324,22038012）
