Hierarchical loading of CuO on SiO_(2) aerogel@high crystalline TiO_(2) nanofibers for efficiently photocatalytic reduction of CO_(2) without sacrificial agent
作者机构：State Key Laboratory of Marine Resource Utilization in South China SeaSpecial Glass Key Lab of Hainan ProvinceHainan Provincial Fine Chemical Engineering Research CenterHainan UniversityHaikou 570228China Hainan haikong Special Glass Techology Co.Ltd.Chengmai 571900China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2022年第15卷第5期
页 面：3872-3879页
核心收录：
学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
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).
主 题：hierarchical structure fibrous morphology high crystallinity lattice doping without sacrificial agent
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.
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