长沙理工大学学报（自然科学版）
長沙理工大學學報（自然科學版）
장사리공대학학보（자연과학판）
Journal of Changsha University of Science and Technology(Natural Science)
2014年
1期
88-92
,共5页
酸催化剂%溶胶-凝胶法%TiO2%光催化
痠催化劑%溶膠-凝膠法%TiO2%光催化
산최화제%용효-응효법%TiO2%광최화
acid catalyst%sol-gel%TiO2%photocatalysis
以 H2 SO4,HCl和一水合柠檬酸作酸催化剂,采用溶胶-凝胶法合成了纳米 TiO2光催化剂。通过XRD,TEM,HR-TEM,Uv-Vis 和 FT-IR 等分析手段对样品进行表征。以亚甲基蓝(MB)为目标降解物,对催化剂的光催化性能进行评价。研究结果表明,酸对 TiO2的结构和性能有很大的影响：以 H2 SO4做催化剂时,TiO2颗粒分布均匀,粒径在7~12 nm 之间,全为锐钛矿相；以 HCl 作催化剂时,TiO2的粒径约为20 nm,全为锐钛矿相；而以一水合柠檬酸作催化剂时,TiO2的粒径较大,约为30 nm,且团聚严重,为锐钛矿相和金红石相的混合相。以 H2 SO4作催化剂制备的TiO2光催化活性最好。
以 H2 SO4,HCl和一水閤檸檬痠作痠催化劑,採用溶膠-凝膠法閤成瞭納米 TiO2光催化劑。通過XRD,TEM,HR-TEM,Uv-Vis 和 FT-IR 等分析手段對樣品進行錶徵。以亞甲基藍(MB)為目標降解物,對催化劑的光催化性能進行評價。研究結果錶明,痠對 TiO2的結構和性能有很大的影響：以 H2 SO4做催化劑時,TiO2顆粒分佈均勻,粒徑在7~12 nm 之間,全為銳鈦礦相；以 HCl 作催化劑時,TiO2的粒徑約為20 nm,全為銳鈦礦相；而以一水閤檸檬痠作催化劑時,TiO2的粒徑較大,約為30 nm,且糰聚嚴重,為銳鈦礦相和金紅石相的混閤相。以 H2 SO4作催化劑製備的TiO2光催化活性最好。
이 H2 SO4,HCl화일수합저몽산작산최화제,채용용효-응효법합성료납미 TiO2광최화제。통과XRD,TEM,HR-TEM,Uv-Vis 화 FT-IR 등분석수단대양품진행표정。이아갑기람(MB)위목표강해물,대최화제적광최화성능진행평개。연구결과표명,산대 TiO2적결구화성능유흔대적영향：이 H2 SO4주최화제시,TiO2과립분포균균,립경재7~12 nm 지간,전위예태광상；이 HCl 작최화제시,TiO2적립경약위20 nm,전위예태광상；이이일수합저몽산작최화제시,TiO2적립경교대,약위30 nm,차단취엄중,위예태광상화금홍석상적혼합상。이 H2 SO4작최화제제비적TiO2광최화활성최호。
Nano-TiO2 was prepared by sol-gel method using sulfuric acid,hydrochloric acid or citric acid monohydrate as the acid catalyst.The products were characterized by XRD, TEM,HR-TEM,Uv-Vis and FTIR.The photocatalytic activity of the products was carried out by photocatalytic decomposition of methylene blue(MB).The results indicate that the structures and properties of the nanocrystals are determined by the acid catalyst:When the catalyst is sulfuric acid,TiO2 particles distribute evenly with the size of 7~12 nm and the crystalline type is only anatase.When the catalyst is hydrochloric acid,the particle size of the TiO2 is about 20 nm,with anatase phase only.When the catalyst is citric acid mono-hydrate,the TiO2 particle size is bigger,which is about 30 nm,aggregated seriously,and the phases are mixed with anatase and rutile phase.The product made by sulfuric acid has the highest photocatalytic activity.
