Fast photoelectro-reduction of CrVIover MoS2@TiO2nanotubes on Ti wire.
A stable MoS2nanosheets@TiO2NTAs composite was prepared via a simple hydrothermal process. Few-layer MoS2nanosheets distributed on the TiO2nanotube top surface and the inner walls rather than filling in the tubes, allowing abundant tubular channels open to environment and benefiting for efficient mass transport. Photocatalytic (PE) and photoelectrocatalytic (PEC) performance of the composite were evaluated on CrVIreduction, with variable low molecule weight organic acids (LOAs) added as sacrificial electron donor to form a charge-transfer-complex (CTC) between LOAs and TiO2/MoS2, which is sensitive to the visible light illumination and could induce the photo-reduction of CrVIand photo-oxidation of LOAs. The overall trend of CrVIPEC rates are in the order as: L(+)-Tartaric acid>oxalic acid>citric acid>malic acid>amber acid, which is 103.9>62.5>31.2>21.6>2.5mg/Lmin-1cm-2, respectively. The improved catalytic performance and excellent stability of the composite can be attributed to the abundant active adsorption and reaction sites on MoS2nanosheets and the formation of a heterojunction between TiO2and MoS2. Moreover, the appropriate application of LOAs and voltage also have a great contribution to the utilization of sunlight and efficient separation of photogenerated carriers.
High Level Laboratory of Jiangxi Province for Persistent Pollutants Control, Recycle and Reuse, Nanchang Hangkong University, Nanchang 330063, PR China.
Lixia
L
Yang
High Level Laboratory of Jiangxi Province for Persistent Pollutants Control, Recycle and Reuse, Nanchang Hangkong University, Nanchang 330063, PR China.
Xutong
X
Zheng
High Level Laboratory of Jiangxi Province for Persistent Pollutants Control, Recycle and Reuse, Nanchang Hangkong University, Nanchang 330063, PR China.
Ming
M
Liu
High Level Laboratory of Jiangxi Province for Persistent Pollutants Control, Recycle and Reuse, Nanchang Hangkong University, Nanchang 330063, PR China; College of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, PR China. Electronic address: sllou@hnu.edu.cn.
Shenglian
S
Luo
High Level Laboratory of Jiangxi Province for Persistent Pollutants Control, Recycle and Reuse, Nanchang Hangkong University, Nanchang 330063, PR China.
Yan
Y
Luo
College of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Guifa
G
Li
In situ hydrothermal method; LOAs; MoS(2) nanosheets@TiO(2) NTAs; PEC Cr(VI) reduction