文献类型：期刊文献

英文题名：Unique 1D/3D K2Ti6O13/TiO2 micro-nano heteroarchitectures: controlled hydrothermal crystal growth and enhanced photocatalytic performance for water purification

作者：Wang, Qiang[1,2];Fan, Chenming[1];Li, Guomin[1];Luo, Jiangshui[3,4];Li, Bing[1,3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 1295 Dingxi Roa4, Shanghai 200050, Peoples R China;[3]Longyan Univ, Collaborat Innovat Ctr Clean Energy, Longyan 364012, Peoples R China;[4]Katholieke Univ Leuven, Dept Phys & Astron, B-3001 Leuven, Belgium

年份：2019

卷号：9

期号：24

起止页码：7023

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20195107871630);WOS:【SCI-EXPANDED(收录号:WOS:000502091800015)】；

基金：The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51774145). "Minjiang Scholar" Program of Department of Education, Fujian Province, China is also acknowledged.

语种：英文

外文关键词：Titanium dioxide - Water treatment - Crystal growth - Photocatalysis - Durability - Purification - Heterojunctions - Light - Charge transfer - Solar energy conversion - Environmental technology - Solar energy

摘要：Semiconductor photocatalysis towards pollutant degradation driven by solar energy is regarded as a promising technology to solve global energy and environmental problems. In this work, three-dimensional (3D) TiO2 microflowers (MFs) were hybridized with one-dimensional (1D) K2Ti6O13 nanobelts (NBs) to construct novel hierarchical Ti-O-based micro-nano heteroarchitectures (HAs) using a controlled hydrothermal route. The well-developed TiO2 MFs were featured with their petals consisting of several 1D nanostructures with the width of around 100-200 nm. Particularly, the crystal growth mechanism of the unique 1D/3D K2Ti6O13/TiO2 HAs was proposed based on the time-dependent experiments combined with structural and morphological characterizations. Unexpectedly, the optimized K2Ti6O13/TiO2 composites exhibited much higher photocatalytic performance for the degradation of organic dyes and antibiotics under simulated sunlight irradiation, which was more than 2-folds higher than that of single K2Ti6O13 and TiO2 catalysts. Moreover, the photocatalytic activity of K2Ti6O13/TiO2 composites for dye degradation was higher than that of commercial P25 under visible light irradiation (lambda > 400 nm). Apart from the advantages of hierarchical micro-nano HAs in improving light adsorption and surface area, the enhanced photocatalytic properties could be particularly attributed to the formation of K2Ti6O13/TiO2 heterojunctions that offered available interfacial channels for charge transfer and separation, as proved by the photoluminescence and photoelectrochemical measurements. Furthermore, good stability and long-term durability of the composite photocatalysts were also determined by cycling tests, mainly resulting from the tightly combined K2Ti6O13/TiO2 heterostructures. This work can be extended to design other hierarchical TiO2-based micro-nano hybrids with superior photocatalytic properties for environmental purification and solar energy conversion.