Yi Zheng,Gang Chen,Yaoguang Yu,Yansong Zhou,Fang He
A carbon doping method is developed to overcome the drawback of conventional carbon doping method. The carbon dopant is synthesized by treating carbon with dilute nitric acid through hydrothermal process. Carbon-doped WO 3 ·0.33H 2 O (C WO 3 ·0.33H 2 O) is obtained by adding the carbon dopant solution, and then through an additional hydrothermal process. Based on XRD, Raman and XPS, carbon have been incorporated into the interstitial position of WO 3 ·0.33H 2 O unit cell rather than substitution of oxygen in lattice of WO 3 ·0.33H 2 O, which induces distortion of WO 6 octahedron and lattice defect. In addition, carbon doping also induces the emergence of new level above the valence band. The new level increases the migration pathway of photo-generated carriers, which reduces the recombination rate of photo-generated carriers. The changes of band structure, distortion of WO 6 octahedron and lattice defect are beneficial to improve the photocatalytic performance of WO 3 ·0.33H 2 O. Compared with pristine WO 3 ·0.33H 2 O, C WO 3 ·0.33H 2 O display better photocatalytic performance on degradation of rhodamine B (RhB), which include the faster de-ethylation process and cycloreversion process. Moreover, the experiments of radical quenchers confirmed that the h + display the main influence on degradation of RhB. This study implies that carbon can be doped into some metal oxide hydrates through a mild preparation process, which provides a possible way for the synthesis of carbon doped thermal unstable materials.
Deng Yuehong,Zhou Yi,Tang Haiqin,Xu Yifeng,Tan Yawen,Zou Hao,Xiang Ye
In this work, Bi spheres were deposited on bulk WO 3 ·0.33H 2 O and TiO 2 (P25) nanoparticles to form Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction material for the first time by a simple hydrothermal method. The as-prepared materials were comprehensively characterized by XRD, XPS, SEM, TEM, UV–Vis DRS, BET surface area, EIS, and Mott-Schottky analysis. The ternary Bi/TiO 2 /WO 3 ·0.33H 2 O composites exhibited superior degradation efficiency for RhB than pure WO 3 ·0.33H 2 O, TiO 2 (P25), and their binary composites. The degradation rate reached 99.84% after 30 min under simulated sunlight. The enhancement of photocatalytic activity could be attributed to the Z-scheme heterojunction system with metal Bi as an electronic medium, which greatly enhanced the efficiency of charge separation. This report demonstrated that Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction photocatalytic material has potential application value in dye wastewater treatment.
危险品化学品经营许可证（带存储）