Core-Shell Heterostructured and Visible-Light-Driven Titanoniobate/TiO2 Composite for Boosting Photodegradation Performance
Core-Shell Heterostructured and Visible-Light-Driven Titanoniobate/TiO2 Composite for Boosting Photodegradation Performance
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用于提高光降解性能的核壳异质结构和可见光驱动钛铌酸盐/TiO2 复合材料
DOI：
10.3390/nano9101503
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发表时间：
2019-10
期刊：
影响因子：
5.3
通讯作者：
Zou Zhigang
中科院分区：
文献类型：
--
作者：
Liu Chao;Gao Xin;Han Zitong;Sun Yao;Feng Yue;Yu Guiyun;Xi Xinguo;Zhang Qinfang;Zou Zhigang
本文报道了一维(一维)S掺杂的K3Ti5NbO14@TiO2STNT(STNT)核壳结构复合材料，它以硫脲为光源，通过简单的组装-焙烧法制备了具有较高可见光催化降解活性的核壳结构复合材料。各向异性的棒状结构有利于光生载流子的快速传输。S6+对Ti4+的取代主要结合在TiO2壳的晶格中，在导带(CB)位置以下形成带内能带态，从而产生Ti−O−S键，从而产生可见光响应。缺电子的S原子的存在有利于降低光生电子与空穴俘获电子的复合速率(e−)。同时，K3Ti5NbO14与TiO2之间形成了紧密的界面，形成了纳米异质结结构，促进了界面光生电子和空穴的分离。由于S掺杂和异质结的协同作用，STNT复合材料对亚甲基蓝(MB)的可见光催化降解率高于纯K3Ti5NbO14。提出了可能的光催化机理，并进行了合理的讨论。这项工作可能为构建用于可持续环境修复和资源短缺的高效核壳型光催化剂提供洞察力。
Herein, we report a one-dimensional (1D) S-doped K3Ti5NbO14@TiO2 (STNT) core-shell heterostructured composite with an enhanced photocatalytic degradation activity under visible light, which was prepared by a simple reassembly-calcination method using thiourea as the S source. The anisotropically shaped rods are favorable for the rapid transport of photogenerated charge carriers. The substitution of Ti4+ by S6+ is primarily incorporated into the lattice of the TiO2 shell so as to create an intra-band-gap state below the conduction band (CB) position, giving rise to Ti−O−S bonds and thus the visible light response. The presence of electron-deficient S atoms is of benefit to the decreased recombination rate of photogenerated electrons and holes by capturing electrons (e−). Meanwhile, a tight close interface between K3Ti5NbO14 and TiO2 was formed to achieve a nano-heterojunction structure, leading to the fostered separation of its interfacial photogenerated electrons and holes. The visible-light-driven photocatalytic degradation of methylene blue (MB) by STNT composites is higher than that by pure K3Ti5NbO14, owing to the synergistic effects of S doping and heterojunction. A possible photocatalytic mechanism was proposed with a reasonable discussion. This work may provide an insight into constructing highly efficient core-shell photocatalysts used toward sustainable environmental remediation and resource shortages.
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