化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (6) : 191-198. DOI: 10.19817/j.cnki.issn1006-3536.2023.06.035

科学研究

g-C₃N₅纳米片光催化还原Cr(Ⅵ)和抗菌性能研究

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Study on photocatalytic reduction of Cr(Ⅵ) and antibacterial activities of g-C₃N₅ nanosheets

Ma Zhanqiang¹, Zhang Kaiyue¹, Guo Wei¹, Wang Nan¹, Li Juan²

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Received
2022-12-11
Issue Date	Revised Date
2023-07-07	2022-12-11

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摘要

在高温热聚合制备块体石墨相氮化碳(g-C₃N₅)的基础上,通过液相超声剥离获得g-C₃N₅纳米片,利用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、红外光谱(FT-IR)、X射线光电子能谱(XPS)、紫外-可见光(UV-Vis)、荧光光谱(PL)及BET比表面积对样品进行表征。结果表明:g-C₃N₅纳米片在可见光下还原Cr(Ⅵ)和灭活大肠杆菌(E.coli)的性能均优于块体g-C₃N₅。g-C₃N₅纳米片在30min内对Cr(Ⅵ)的还原率达到86%,反应速率常数为块体g-C₃N₅的1.46倍。g-C₃N₅纳米片在180min内将E.coli全部灭活,h⁺和·O^-₂为抗菌过程的主要活性基团,其通过氧化作用破坏E.coli细胞结构,导致细胞坍塌凋亡。g-C₃N₅纳米片光催化活性增强归因于CB位置上移和VB位置下移使其氧化还原能力增强,同时优良的光生载流子分离效率和大的比表面积也助力其光催化性能提高。

Abstract

g-C₃N₅ nanosheets were prepared by liquid-phase ultrasonic exfoliation from bulk g-C₃N₅ which was synthesized through high-temperature thermal polymerization method.The samples were characterized by SEM,TEM,XRD,FT-IR,XPS,UV-Vis,PL and BET.The results showed that the reduction performance of Cr(Ⅵ) and inactivation of E.coli by g-C₃N₅ nanosheets were superior to those by bulk g-C₃N₅ under visible light irradiation.The Cr(Ⅵ) reduction rate of g-C₃N₅ nanosheets was 86% in 30min,and the constant of reaction rate was 1.46 times that of bulk g-C₃N₅.All E.coli cells were inactivated within 180min by the g-C₃N₅ nanosheets.h⁺ and ·O^-₂ were the predominant reactive species in the antibacterial process,which could damage the structure of E.coli cells through oxidation,leading to cells collapse and apoptosis.The improved photocatalytic activity of g-C₃N₅ nanosheets was attributed to the enhancement of redox ability by the upward shift of CB and downward shift of VB.Meanwhile,the excellent separation efficiency of photogenerated carriers and the large specific surface area were also beneficial to improve the photocatalytic performance of the g-C₃N₅ nanosheets.

关键词

石墨相氮化碳纳米片 / 液相剥离 / 光催化 / 还原Cr(Ⅵ) / 抗菌

Key words

g-C₃N₅ nanosheets / liquid exfoliation / photocatalysis / Cr(Ⅵ) reduction / antibacterial activity

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g-C₃N₅纳米片光催化还原Cr(Ⅵ)和抗菌性能研究[J]. 化工新型材料, 2023, 51(6): 191-198 DOI:10.19817/j.cnki.issn1006-3536.2023.06.035

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