<strong>ZnO/CdS/Ag</strong>复合光催化剂的制备及其催化和抗菌性能

doi:10.11901/1005.3093.2021.586

材料研究学报

2023, Vol. 37

Issue (1): 10-20 DOI: 10.11901/1005.3093.2021.586

研究论文

本期目录 | 过刊浏览

ZnO/CdS/Ag复合光催化剂的制备及其催化和抗菌性能

谢锋¹, 郭建峰¹, 王海涛², 常娜¹(

)

^1.天津工业大学化学工程与技术学院天津 300387
^2.天津工业大学环境科学与工程学院天津 300387

Construction of ZnO/CdS/Ag Composite Photocatalyst and Its Catalytic and Antibacterial Performance

XIE Feng¹, GUO Jianfeng¹, WANG Haitao², CHANG Na¹(

)

^1.School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China
^2.School of Environmental Science and Technology, Tianjin 300387, China

引用本文:

谢锋, 郭建峰, 王海涛, 常娜. ZnO/CdS/Ag复合光催化剂的制备及其催化和抗菌性能[J]. 材料研究学报, 2023, 37(1): 10-20.
Feng XIE, Jianfeng GUO, Haitao WANG, Na CHANG. Construction of ZnO/CdS/Ag Composite Photocatalyst and Its Catalytic and Antibacterial Performance[J]. Chinese Journal of Materials Research, 2023, 37(1): 10-20.

全文: PDF(16627 KB) HTML

摘要:

先用水热反应合成六方晶相CdS多层级花状微球并在其表面生长ZnO纳米棒形成均匀的ZnO/CdS复合结构，然后用光还原法将Ag纳米颗粒负载于ZnO纳米棒制备出ZnO/CdS/Ag三元半导体光催化剂，对其进行扫描电镜和透射电镜观察、光电性能测试、活性基团捕获实验以及光催化降解和抗菌性能测试，研究其对亚甲基蓝(MB)的降解和抗菌性能。结果表明：ZnO纳米棒均匀生长在CdS微球表面，CdS晶体没有明显裸露，Ag纳米粒子负载在ZnO纳米棒的表面；ZnO/CdS/Ag三元复合光催化剂有良好的可见光响应、较低的阻抗和较高的光电流密度；ZnO/CdS/Ag复合光催化剂能同时产生羟基和超氧自由基等活性氧基团；ZnO/CdS/Ag三元复合光催化剂对亚甲基蓝(MB)的30 min降解率高于90%；0.25 mg/mL的ZnO/CdS/Ag对革兰氏阴性菌(大肠杆菌)的灭菌率高于96%，对革兰氏阳性菌(金黄色葡萄球菌)能完全灭除。

关键词 ：无机非金属材料, 光催化, 氧化锌, 纳米棒, 灭菌

Abstract：

Firstly, hexagonal crystalline CdS multilayer flower-like microspheres were synthesized by hydrothermal reaction, next on the surface of which ZnO nanorods were grown on to form uniform ZnO/CdS composite, and thirdly ZnO/CdS/Ag ternary semiconductor photocatalyst was prepared by depositing Ag nanoparticles onto ZnO nanorods by photoreduction method. The prepared ZnO/CdS/Ag photocatalyst was characterized by scanning electron microscope and transmission electron microscope, while its photoelectric property, active group capture characteristics, photocatalytic degradability for methylene blue (MB) and antibacterial property were also examined. The results show that ZnO nanorods uniformly grow on the surface of CdS microspheres, and Ag nanoparticles were deposited on the surface of ZnO nanorods. ZnO/CdS/Ag ternary photocatalyst has good visible light response, low impedance and high photocurrent density. ZnO/CdS/Ag composite photocatalyst can simultaneously produce hydroxyl and superoxide radicals and other reactive oxygen groups. The degradation rate of methylene blue (MB) on ZnO/CdS/Ag ternary photocatalyst in 30 min is higher than 90%. The sterilization rate of 0.25 mg/mL ZnO/CdS/Ag to Gram-negative bacteria (Escherichia coli) is higher than 96%, and gram-positive bacteria (Staphylococcus aureus) can be completely destroyed.

Key words： inorganic non-metallic materials photocatalysis zinc oxide nanorod antibacterial property

收稿日期: 2021-10-13

ZTFLH:

X703.1

基金资助:国家重点研发计划(2019YFC0408400)

作者简介: 谢锋，男，1996年生，硕士生

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图1 ZnO/CdS/Ag的制备流程图

图2 ZnO、CdS、ZnO/CdS和ZnO/CdS/Ag催化剂的XRD谱

图3 ZnO/CdS/Ag催化剂的XPS谱

图4 CdS(a)、ZnO(b)、ZnO/CdS (c) 、ZnO/CdS/Ag(d)的扫描电镜照片

图5 ZnO/CdS(a)、ZnO/CdS/Ag(b)的透射电镜照片

图6 ZnO/CdS/Ag催化剂的元素分布，总元素图(a)、Zn(b)、O(c)、Cd(d)、S(e)、Ag(f)和ZnO/CdS/Ag催化剂的EDS元素组成图(g)

图7 ZnO、CdS、ZnO/CdS、ZnO/CdS/Ag的紫外-可见吸收光谱(a)、光致发光光谱(b)、电化学阻抗图(c)及瞬时光电流响应图(d)

图8 ZnO、CdS、ZnO/CdS、ZnO/CdS/Ag对亚甲基蓝的光催化降解曲线(a)及其动力学拟合曲线(b)；ZnO/CdS/Ag与参考文献中光催化反应效果对比图(c)；ZnO/CdS/Ag光催化反应活性物种捕获实验(d)

图9 0.25 mg/mL ZnO/CdS/Ag对大肠杆菌(空白a1、黑暗条件a2、光照条件a3)及金黄色葡萄球菌(空白b1、黑暗条件b2、光照条件b3)的抗菌性能

图10 0.5 mg/L ZnO/CdS/Ag对大肠杆菌(黑暗条件a1、光照条件a2)及金黄色葡萄球菌(黑暗条件b1、光照条件b2)的抗菌性能

图11 Mott-Schottky曲线(a)以及光催化反应机理图(b)

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