Authors: Yongjin Luo Yuxian Xu Xinping Liu Hun Xue Qingrong Qian Qinghua Chen
Publish Date: 2016/09/29
Volume: 52, Issue: 3, Pages: 1265-1271
Abstract
The fast recombination of photogenerated conduction band electrons e cb − and valance band holes h vb + of TiO2 results in an unsatisfactory photocatalytic performance for organic degradation To increase the efficiency of charge separation TiO2 was modified by Cu–Ce codoping considering the better redox properties of copper–ceria oxide with respect to the single oxide ie an easier electron capturing ability An optimal Cu–Ce codoped TiO2 with the initial molar ratio of Cu/Ce at 31 was prepared by a hydrothermal method with the aim to greatly promote the charge separation and characterized by XRD BET DRS PL HRTEM and XPS techniques Upon ultraviolet light irradiation it exhibits significantly enhanced photocatalytic activity about 58 times that of Ti–HF The presence of Cu2+ and Ce3+/Ce4+ benefits electrons captured by molecular oxygen while an increased hydroxyl groups upon Cu–Ce codoping consume more holes resulting in prolonged lifetime of photogenerated carriers Moreover it is proved that electron transfers preferably from conduction band CB of TiO2 to CB of CuO and then to nearby CeO2This work was supported by the National Natural Science Foundation of China 21407025 21307012 National Science Foundation of Fujian Province 2016J01047 2014J01035 National Program for the Fujian Provincial Science and Technology and the Provincial Financial Department 2013H6007 Educational Commission of Fujian Province JA14090 and Outstanding Youth Research Training Program of University of Fujian Province
Keywords: