Format

Send to

Choose Destination
Nanomaterials (Basel). 2019 Oct 22;9(10). pii: E1503. doi: 10.3390/nano9101503.

Core-Shell Heterostructured and Visible-Light-Driven Titanoniobate/TiO2 Composite for Boosting Photodegradation Performance.

Liu C1,2, Gao X3, Han Z4, Sun Y5, Feng Y6, Yu G7, Xi X8, Zhang Q9,10, Zou Z11.

Author information

1
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. cliu@ycit.edu.cn.
2
Eco-Materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China. cliu@ycit.edu.cn.
3
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. gaoxinvv123@163.com.
4
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. zitonghan@hotmail.com.
5
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. sunyao98@hotmail.com.
6
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. fengy98@hotmail.com.
7
School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China. yuguiyun1@163.com.
8
School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China. xxg@ycit.cn.
9
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. qfangzhang@gmail.com.
10
Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China. qfangzhang@gmail.com.
11
Eco-Materials and Renewable Energy Research Center (ERERC), College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China. zgzou@nju.edu.cn.

Abstract

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.

KEYWORDS:

core-shell structure; photocatalytic degradation; titanoniobate; visible light

Supplemental Content

Full text links

Icon for Multidisciplinary Digital Publishing Institute (MDPI) Icon for PubMed Central
Loading ...
Support Center