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首页> 外文期刊>RSC Advances >Isolated/interacting Au islands on TiO2 NTs for the switching photocatalytic/photoelectrocatalytic degradation of refractory organic pollutants in wastewater
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Isolated/interacting Au islands on TiO2 NTs for the switching photocatalytic/photoelectrocatalytic degradation of refractory organic pollutants in wastewater

机译：TiO2 NTs上的隔离/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

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A three-dimensional surface catalyst with isolated/interacting Au islands loaded on TiO _(2) nanotubes (Au/TiO _(2) 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/TiO _(2) 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/TiO _(2) 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 TiO _(2) NTs. The synergistic effect between the nano-tubular organized TiO _(2) 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.
机译：制备了负载在TiO _（2）纳米管（Au / TiO _（2）NTs）上的具有隔离/相互作用的金岛的三维表面催化剂，用于转换难降解有机废水的光催化/光电催化（PC / PEC）降解，以及显示出突出的催化活性和良好的稳定性。金岛充当“电子储库”，以延长光生电子空穴对的寿命。通过XRD，SEM，EDS，XPS和ICP-AES确定了Au / TiO_（2）NTs的基本结构和形貌，并通过UV-vis DRS和光电流响应曲线估算了光学性质。通过对硝基苯溶液作为难降解污染物在水中的降解来测量Au / TiO _（2）NTs的PC / PEC转换，结果表明，可以轻松地将光催化和光电催化的最佳Au负载转换为具有最佳降解率。我们创造性地提出，通过使用孤立的/相互作用的金岛来调节和增强TiO_（2）NTs的PC / PEC性能，金纳米颗粒之间的相互作用会影响催化剂的催化性能。纳米管有组织的TiO_（2）与孤立/相互作用的金岛之间的协同作用促进了以光电流响应为特征的金等离子体诱导的电荷的分离和转移，从而使催化剂具有商业化和稳定的光催化作用/光电催化作用在很大程度上。

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