Urea-modified carbon quantum dots as electron mediator decorated g-C3N4/WO3 with enhanced visible-light photocatalytic activity and mechanism insight
Jia, JK (Jia, Jiankui)[ 1 ] ; Jiang, CY (Jiang, Caiyun)[ 2 ] ; Zhang, XR (Zhang, Xiaorui)[ 1 ] ; Li, PJ (Li, Panjie)[ 1 ] ; Xiong, JX (Xiong, Jianxi)[ 1 ] ; Zhang, Z (Zhang, Zheng)[ 1 ] ; Wu, T (Wu, Ting)[ 1 ] ; Wang, YP (Wang, Yuping)[ 1,3 ]*（王玉萍）
[ 1 ] Nanjing Normal Univ, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Sch Chem & Mat Sci, Nanjing 210046, Jiangsu, Peoples R China
[ 2 ] Jiangsu Inst Commerce, Dept Engn & Technol, Nanjing 211168, Jiangsu, Peoples R China
[ 3 ] Nanjing Univ Sci & Technol, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Jiangsu, Peoples R China
APPLIED SURFACE SCIENCE，201911,495
A novel urea modified carbon quantum dots (NCDs) decorated g-C3N4/WO3 Z-scheme heterojunction was prepared through in situ calcination and physical deposition way in the article. The analysis data of UV-vis spectroscopy demonstrated that the introduction of NCDs and the construction of g-C3N4/WO3 Z-scheme heterojunction can significantly improve the visible-light utilization. The enhanced photocurrent response and the reduced fluorescence intensity indicated the recombination of photogenerated electron-hole pairs in g-C3N4/WO3/NCDs composites is significantly inhibited. In addition, the results of cyclic experiment and the XRD diffraction peak of g-C3N4/WO3/NCDs before and after the experiment declared that g-C3N4/WO3/NCDs possess strong structural stability. Obviously, the excellent photocatalytic performance of g-C3N4/WO3/NCDs can be ascribed to the above three experimental processes. Experimental analysis of free radical capture confirmed that superoxide ion radicals (center dot O-2(-)) was the main active component in photocatalytic degradation, and the possible degradation mechanism of g-C3N4/WO3/NCDs was proposed.