中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 合肥物质科学研究院
  3. 中国科学院合肥物质科学研究院
Mars-van-Krevelen mechanism-based blackening of nano-sized white semiconducting oxides for synergetic solar photo-thermocatalytic degradation of dye pollutants

文献类型：期刊论文

作者Bao, Haoming2; Zhu, Shuyi1,2; Zhou, Le1,2; Fu, Hao1,2; Zhang, Hongwen2; Cai, Weiping1,2
刊名NANOSCALE
出版日期2020-02-14
卷号12
ISSN号2040-3364
DOI10.1039/c9nr09534a
通讯作者Zhang, Hongwen(hwzhang@issp.ac.cn) ; Cai, Weiping(wpcai@issp.ac.cn)
英文摘要Blackening (or enhancing the optical absorption in the visible region) of nano-sized white semiconducting oxides (N-WSOs) is of significant importance for solar utilization. Here, we present a novel Mars-van-Krevelen mechanism-based method for blackening the N-WSOs via facile one-step heating of the N-WSOs with alcohols. Taking n-butanol-induced blackening of TiO2 (anatase) as an example, the pristine TiO2 NP powders can be successfully blackened to form black TiO2 (B-TiO2) via heating with n-butanol at 300 degrees C for 20 min. Technical analyses demonstrate that the B-TiO2 nanocrystals are wrapped with a 2 nm thick disordered layer, which is rich in oxygen vacancies, Ti3+ and hydroxyl groups. Both theoretical and experimental results show that B-TiO2 has much stronger optical absorption in the visible region than pristine TiO2. Furthermore, the influence factors (including heating temperatures and alcohol types) and good universality of this blackening method are also demonstrated. A blackening principle based on Mars-van-Krevelen mechanism-induced oxygen vacancy generation and hydroxylation-anchoring of oxygen vacancies has been proposed, and the mechanism can well explain all the phenomena observed in experiments. Importantly, such B-TiO2 shows hugely enhanced activity in solar photodegradation of dye pollutants. Under simulated solar irradiation, the degradation rate constant achieved by the B-TiO2 catalyst is 2.3 times that of the pristine TiO2, showing an obvious enhancement. Further experiments reveal that the improved degradation activity is mainly attributed to the enhanced optical absorption in the visible region and the synergistic photothermal and photocatalytic effect. This study demonstrates a new and facile approach to blacken the N-WSOs for enhanced solar utilization.
WOS关键词OPTICAL-PROPERTIES ; ZNO NANOPARTICLES ; TIO2 ; ABSORPTION ; ANATASE ; PHOTOCATALYSIS ; CATALYSTS ; TITANIA ; GROWTH ; RUTILE
资助项目National Key Research and Development Program of China[2017YFA0207101] ; National Natural Science Foundation of China[11974352] ; National Natural Science Foundation of China[51771182] ; National Natural Science Foundation of China[51531006] ; Chinese Postdoctoral Science Foundation[2019M662211]
WOS研究方向Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种英语
WOS记录号WOS:000515391000047
出版者ROYAL SOC CHEMISTRY
资助机构National Key Research and Development Program of China ; National Natural Science Foundation of China ; Chinese Postdoctoral Science Foundation
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/103999]  
专题中国科学院合肥物质科学研究院
通讯作者Zhang, Hongwen; Cai, Weiping
作者单位1.Univ Sci & Technol China, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Inst Solid State Phys, Anhui Key Lab Nanomat & Nanotechnol, Key Lab Mat Phys, Hefei 230031, Peoples R China
推荐引用方式
GB/T 7714		 Bao, Haoming,Zhu, Shuyi,Zhou, Le,et al. Mars-van-Krevelen mechanism-based blackening of nano-sized white semiconducting oxides for synergetic solar photo-thermocatalytic degradation of dye pollutants[J]. NANOSCALE,2020,12.
APA Bao, Haoming,Zhu, Shuyi,Zhou, Le,Fu, Hao,Zhang, Hongwen,&Cai, Weiping.(2020).Mars-van-Krevelen mechanism-based blackening of nano-sized white semiconducting oxides for synergetic solar photo-thermocatalytic degradation of dye pollutants.NANOSCALE,12.
MLA Bao, Haoming,et al."Mars-van-Krevelen mechanism-based blackening of nano-sized white semiconducting oxides for synergetic solar photo-thermocatalytic degradation of dye pollutants".NANOSCALE 12(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。