期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134181
关键词
Photocatalysis; Dissolution-recrystallization strategy; Alkali conversion; Charge separation; BiVO4/Bi25VO40 heterojunction
资金
- National Natural Science Foundation of China [21872065, 22169010, 21763013]
- Natural Science Foundation of Jiangxi Province [20204BCJL23039, 20192ACBL21027, 20192BAB203007]
In this study, a novel BiVO4/Bi25VO40 heterojunction was designed by the in situ conversion of pre-prepared BiVO4. The formation process and phase composition of the heterojunction were investigated, and it was found that the heterojunction formed through a dissolution-recrystallization process. By adjusting the alkali treatment conditions, the phase composition of the heterojunction can be precisely modulated, leading to enhanced photocatalytic performance in the probe reaction of tetracycline degradation. This study provides deeper insight into the rational design of highly efficient semiconductor photocatalysts.
Constructing a heterojunction between semiconductors with identical elements constitutes an intimate contact that can greatly accelerate the charge carrier transfer and separation. Herein, a novel BiVO4/Bi25VO40 heterojunction was designed by the in situ conversion of pre-prepared BiVO4 in alkaline conditions. We investigated the formation process of BiVO4/Bi25VO40 heterojunctions by XRD structural refinement, Raman spectra, morphology characterization, and density functional theory calculations, and found that heterojunction formation occurred through a dissolution-recrystallization process, in which monoclinic BiVO4 decahedrons were first etched by alkali solution on the preferential {0 1 0} face and then transformed into cubic Bi25VO40. By adjusting the alkali treatment conditions, the phase composition of the heterojunction can be precisely modulated with BiVO4 decreasing and Bi25VO40 increasing in content as the synthesis time was extended. Benefiting from the in situ conversion strategy and matched band structure, the intimate type II heterojunction with close interfacial contact was formed between BiVO4 and Bi25VO40, leading to facilitated charge transfer with spatial separation of carriers and significantly enhanced photocatalytic performance in the probe reaction of tetracycline (TC) degradation. The active species responsible for TC removal were explored by radical trapping tests and ESR spectra, and the photodegradation pathways were proposed on the basis of HPLC-MS. This work provides deeper insight on the rational design of highly efficient semiconductor photocatalysts by precise regulation of the crystal growth process for solar energy conversion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据