Hierarchical loading of CuO on SiO_(2) aerogel@high crystalline TiO_(2) nanofibers for efficiently photocatalytic reduction of CO_(2) without sacrificial agent  

作　　者：Man Wen Beibei Ren Xiangzhi Ye Jianxiong He Hong Jiang Chunrong Xiong 

机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,Special Glass Key Lab of Hainan Province,Hainan Provincial Fine Chemical Engineering Research Center,Hainan University,Haikou 570228,China [2]Hainan haikong Special Glass Techology Co.,Ltd.,Chengmai 571900,China

出　　处：《Nano Research》2022年第5期3872-3879,共8页纳米研究（英文版）

基　　金：The authors acknowledgement the financial supports from the Key R&D Planning Project of Hainan Province(No.ZDYF2020015);the Research Lab Construction of Hainan University(No.ZY2019HN09);the National Natural Science Foundation of China(No.51761010).

摘　　要：Silica aerogel was prepared by a sol-gel method with combination of freeze drying.The aerogel was filled with TiCl4 in autoclave and used to fabricate a hierarchical structure of TiO_(2) nanofiber shell and SiO_(2) aerogel core(SiO_(2)@TiO_(2)).The TiO_(2) nanofibers with a diameter of 10-15 nm were highly crystalline and mainly grew along the(101)or(001)planes,favoring charge migration along the growth axis of the fibers.The photoluminescence(PL)emission spectra show that the TiO_(2) nanofibers exhibited much lower PL intensity than P25.The free standing TiO2 nanofibers loaded with CuO had a band gap of 3.04 eV.When CuO was hierarchically loaded on the nanofiber surface and into the aerogel core(SiO_(2)/CuO@TiO_(2)/CuO),the absorption edge significantly red shifted,and the band gap was further narrowed to 2.66 eV.Meanwhile,Fe^(3+)implanted TiO_(2) nanofibers on the aerogel surface(SiO_(2)@Fe-TiO_(2))were also fabricated in the same strategy.The CuO loaded nanofibers(SiO_(2)/CuO@Fe-TiO_(2)/CuO)had a band gap of 2.62 eV.The photocatalytic reduction of CO_(2) was performed under light irradiation by a 300 W Xe-lamp for 4 h.The methanol yield over the SiO_(2)/CuO@Fe-TiO_(2)/CuO reached~2,400 μmol·gcat^(-1) in the absence of sacrificial agent.

关 键 词：hierarchical structure fibrous morphology high crystallinity lattice doping without sacrificial agent 

分 类 号：O644.1[理学—物理化学] TB383[理学—化学]