Isolated/interacting Au islands on TiO(2) NTs for the switching photocatalytic/photoelectrocatalytic degradation of refractory organic pollutants in wastewater.
Isolated/interacting Au islands on TiO(2) NTs for the switching photocatalytic/photoelectrocatalytic degradation of refractory organic pollutants in wastewater.
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TiO2 NT 上的孤立/相互作用金岛用于切换光催化/光电催化降解废水中的难降解有机污染物
DOI：
10.1039/c8ra09160a
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发表时间：
2019-01-18
期刊：
影响因子：
3.9
通讯作者：
Gu, Di
中科院分区：
文献类型：
--
作者：
Zhang, Dan;Wang, Baohui;Wang, Jiaqi;Wang, Hongming;Zhang, Shixu;Gu, Di
A three-dimensional surface catalyst with isolated/interacting Au islands loaded on TiO2 nanotubes (Au/TiO2 NTs) was prepared for the switching photocatalytic/photoelectrocatalytic (PC/PEC) degradation of refractory organic wastewater, and shows prominent catalytic activity and favorable stability. The Au islands act as “electronic reservoirs” for prolonging the lifetime of photo-generated electron–hole pairs. The fundamental structures and morphologies of the Au/TiO2 NTs were determined by XRD, SEM, EDS, XPS and ICP-AES, and the optical properties were estimated by UV-vis DRS and photocurrent response curves. The PC/PEC switching of the Au/TiO2 NTs was measured by the degradation of nitrobenzene solution as a refractory pollutant in water, and the results showed that the optimum Au loading for photocatalysis and photoelectrocatalysis could be easily switched to have an optimal degradation rate. We creatively proposed that the interaction between the Au nanoparticles affects the catalytic performance of the catalyst, by using isolated/interacting Au islands to regulate and enhance the PC/PEC properties of the TiO2 NTs. The synergistic effect between the nano-tubular organized TiO2 and the isolated/interacting Au islands promotes the separation and transfer of charges induced by Au plasma which was characterized by photocurrent responses, thus enabling the catalyst to have a commercial and stable photocatalysis/photoelectrocatalysis effect to a large extent.
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