Fast photoelectro-reduction of Cr-VI over MoS2@TiO2 nanotubes on Ti wire
Fast photoelectro-reduction of Cr-VI over MoS2@TiO2 nanotubes on Ti wire
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Ti 丝上 MoS2@TiO2 纳米管上 Cr-VI 的快速光电还原
DOI：
10.1016/j.jhazmat.2017.01.045
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发表时间：
2017
影响因子：
13.6
通讯作者：
Li Guifa
中科院分区：
文献类型：
--
作者：
Yang Lixia;Zheng Xutong;Liu Ming;Luo Shenglian;Luo Yan;Li Guifa
采用简单的水热法制备了稳定的MoS2纳米片@TiO2NTAs复合材料。几层MoS2纳米片分布在纳米管的顶面和内壁，而不是填充在管中，允许丰富的管状通道对环境开放，有利于有效的质量传输。以可变低分子量有机酸(LOAs)为牺牲电子供体，与TiO2MoS2形成对可见光敏感的电荷转移络合物(CTC)，并能诱导CrVI光还原和LOAs的光氧化反应，考察了复合材料的光催化性能和光电催化性能。CRVIPEC率的总体趋势顺序为：L(+)-酒石酸；草酸；柠檬酸；苹果酸；琥珀酸，分别为103.9、62.5、31.2、21.6、2.5 mg/L、−1 cm−2。复合材料催化性能的提高和良好的稳定性可以归因于MoS2纳米片上丰富的活性吸附和反应中心以及TiO2和MoS2之间形成的异质结。此外，适当的LOAS和电压的应用对太阳光的利用和光生载流子的有效分离也有很大的贡献。
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 > 2.5 mg/L min−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.