Z型异质结复合薄膜UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni的可见光催化性能及机理  

Photocatalytic Performance and Mechanism of Z-scheme Composite Thin Films UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni Under Visible Light Irradiation

作　　者：赵娣[1] 刘洪燕 王树军 孙欣语 张紫璇 齐学宇 刘子帆 ZHAO Di;LIU Hongyan;WANG Shujun;SUN Xinyu;ZHANG Zixuan;QI Xueyu;LIU Zifan(Faculty of Chemistry and Material Science,Langfang Normal University,Langfang 065000,Hebei,China)

机构地区：[1]廊坊师范学院化学与材料科学学院,河北廊坊065000

出　　处：《材料导报》2025年第8期153-158,共6页Materials Reports

基　　金：河北省高等学校科学技术研究项目(QN2022137);大学生创新创业训练项目(X202310100017);河北省创新创业教育教学改革研究与实践项目(2023cxcy177)。

摘　　要：设计和合成高效光催化剂需要实现反应位点的精确调控、光诱导载流子的快速迁移以及可见光的有效吸收。本工作采用恒流电沉积法制备了UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni复合薄膜。UIO-66-NH_(2)和Ag_(3)PO_(4)的能带结构匹配良好,同时纳米Ag作为光生载流子分离中心,形成了由Ag_(3)PO_(4)、Ag和UIO-66-NH_(2)组成的Z型异质结光催化体系,有效地分离了光生电子-空穴对,保留了强氧化-还原活性位点,因而UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni复合薄膜在可见光下表现出优异的光催化性能。此外,光电化学测试结果表明,UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni复合薄膜具有更高的载流子分离速率和更低的催化还原溶解O_(2)的反应势垒。活性物种实验结果表明,·O_(2)^(-)和空穴(h^(+))在光催化降解中起主要作用,进一步证实了系统的Z型异质结光催化降解机制。The design and synthesis of highly efficient photocatalysts require precise regulation of reaction sites,rapid migration of photo induced car-riers,and strong absorption of visible light.UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni composite thin film was prepared by a constant current electrodeposition method.The electronic band structure of UIO-66-NH_(2) and Ag_(3)PO_(4) matched well.At the same time,nano Ag acted as the separation center of photogenerated charge carriers,forming a Z-scheme photocatalytic system consisting of Ag_(3)PO_(4),Ag and UIO-66-NH_(2),which effectively separated photogenerated electron hole pairs and retained strong oxidation-reduction active sites.Therefore,UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni composite thin film has excellent photocatalytic performance under visible light.In addition,the photoelectrochemical test results indicated that the UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni composite thin film had a faster carrier separation rate and a lower catalytic reduction reaction barrier for dissolved O_(2).The results of active species experiments indicated that·O_(2)^(-)and holes(h^(+))played a major role in the photocatalytic degradation,further confirming the Z-scheme photocatalytic degradation mechanism of the system.

关 键 词：UIO-66-NH_(2)/Ag/Ag_(3)PO_(4)/Ni复合薄膜 Z型异质结 恒流电沉积 可见光 光催化 

分 类 号：O643[理学—物理化学] O614[理学—化学]