Transition-metal doped titanate nanowire photocatalysts boosted by selective ion-exchange induced defect engineering
Transition-metal doped titanate nanowire photocatalysts boosted by selective ion-exchange induced defect engineering
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DOI：
10.1016/j.apsusc.2022.153116
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发表时间：
2022-03-31
影响因子：
6.7
通讯作者：
Gao, Pu-Xian
中科院分区：
文献类型：
--
作者：
Lu, Xingxu;Liu, Fangyuan;Gao, Pu-Xian
通过元素掺杂进行缺陷工程是提高半导体光催化剂性能的有效途径。本文通过离子交换法制备了过渡金属掺杂的钛酸盐纳米线（TNW），并研究了其在紫外光照射下对罗丹明B（RhB）的降解。选择性离子（V5+、Cr 3+、Ni 2+和Zn 2+）与来自原始TNW的质子的离子交换导致具有通过TM掺杂的类似于5-20 nm的大孔和从原始TNW继承的类似于3.6-4.5 nm的小孔的纳米线的分级介孔结构，这促进了传质，同时保持了高表面积和活性位点。同时，TM插层部分地将Ti4+还原为Ti 3+并使光学带隙变窄，这与原始TNW的氧空位和超氧自由基一起增强了RhB的吸附和光催化降解性能。这项工作有助于阐明过渡金属掺杂的影响，并为高效和可持续的废水处理提供高性能钛酸盐基光催化剂的合理策略。
Defect engineering through elemental doping is an efficient way to boost the performance of semiconductor photocatalysts. Herein, transition-metal (TM) doped titanate nanowires (TNWs) were prepared via ion-exchange over the titanate precursors and demonstrated for the Rhodamine B (RhB) degradation under ultraviolet (UV) light irradiation. The ion-exchange of selective ions (V5+, Cr3+, Ni2+, and Zn2+) with protons from pristine TNWs resulted in the hierarchical meso-porosity of nanowires with large pores of similar to 5-20 nm by TM doping and small pores of similar to 3.6-4.5 nm inherited from pristine TNWs, which facilitates the mass transfer while maintaining high surface area and active sites. Meanwhile, the TM intercalation partially reduces the Ti4+ to Ti3+ and narrows the optical bandgap, which, together with oxygen vacancies and superoxide radicals from pristine TNWs, enhance the adsorption and photocatalytic degradation performance of RhB. This work helps to elucidate the effects of transition-metal doping and provides a rational strategy towards high performance titanate-based photocatalysts for efficient and sustainable wastewater treatment.