科学研究

亚临界干燥法制备TiO2/SiO2复合气凝胶及其光催化性能研究

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  • 1.海南大学南海海洋资源利用国家重点实验室,海南省特种玻璃重点实验室,海口 570228;
    2.广东工业大学轻工化工学院,广州 510006
张松(1991-),男,硕士研究生,主要从事无机气凝胶的研究,E-mail: 1091643685@qq.com。

网络出版日期: 2020-12-07

基金资助

国家重点研发计划项目(2016YFC0700804);国家自然科学基金(51562008)

Preparation of TiO2/SiO2 composite aerogel by subcritical method and its photocatalytic activity

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  • 1.State Key Laboratory of Marine Resource Utilization in South China Sea,Special Glass Key Lab of Hainan Province,Hainan University,Haikou 570228;
    2.School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006

Online published: 2020-12-07

摘要

以正硅酸乙酯(TEOS)和钛酸四丁酯(TnBT)为原料,去离子水和无水乙醇为溶剂,盐酸、甲酰胺为催化剂,通过酸/碱两步溶胶-凝胶法制得TiO2/SiO2复合醇凝胶,经过老化、溶剂置换等后续工艺,在亚临界条件下干燥制备不同TiO2/SiO2比的复合气凝胶。采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、BET比表面积、热重-差示量热(TG-DSC)和红外光谱(FT-IR)等手段对气凝胶进行了表征。并将制备的TiO2/SiO2复合气凝胶用于紫外光催化降解甲基橙。结果表明:不同TiO2/SiO2比的复合气凝胶经过500℃煅烧之后,n(Ti)∶n(Si)=1∶1时其比表面积最高达480.61m2/g,其组成为无定形SiO2和锐钛矿TiO2。紫外光催化降解甲基橙实验表明,采用亚临界干燥制备得到的TiO2/SiO2复合气凝胶,其催化降解率可达到99.6%,表现出优异的催化性能。

本文引用格式

张松, 丁春华, 姜宏, 何原子, 文曼 . 亚临界干燥法制备TiO2/SiO2复合气凝胶及其光催化性能研究[J]. 化工新型材料, 2020 , 48(11) : 218 -222 . DOI: 10.19817/j.cnki.issn 1006-3536.2020.11.048

Abstract

TiO2/SiO2 composite aerogels were prepared from ethyl orthosilicate (TEOS) and butyl titanate (TnBT) as raw materials,deionized water and absolute ethanol as solvent,hydrochloric acid,ammonia and formamide as the catalysts.The SiO2 and TiO2/SiO2 composite alcohol gels were prepared by acid/base two step sol-gel method.After aging,solvent replacement and other subsequent processes,TiO2/SiO2 aerogels were prepared by subcritical conditions.The aerogels were characterized by SEM,TEM,XRD,BET,TG-DSC and FT-IR.The prepared aerogels were used for ultraviolet photocatalytic degradation of methyl orange.The results shown that the aerogels with different TiO2/SiO2 ratios had a specific surface area of 480.61m2/g when n(Ti)∶n(Si)=1∶1 after being calcinated at 500℃.Its composition was amorphous SiO2 and anatase TiO2.UV-catalyzed degradation of methyl orange showed that the aerogels which prepared by subcritical drying had the catalytic degradation rate up to 99.6%,and exhibited excellent catalytic performance.

参考文献

[1] 邓玮,蒋实,易川,崔龙哲.S掺杂无定形TiO2的制备及可见光催化活性[J].环境科学与技术,2019,42(3):134-139,157.
[2] 房海棠,朱梦玲,颜婷婷.TiO2纳米管的快速制备、改性及光催化性能研究[J].上海纺织科技,2018,46(8):38-41,47.
[3] 强琳辉,郝思琪,吴效楠,等.多孔SiO2/TiO2复合催化剂的制备及其光催化性能的研究[J].广东化工,2017,44(16):100-102.
[4] 彭稳,钟丽萍,刘航,等.有机污染物选择性光催化研究进展[J].水处理技术,2017,43(4):1-5,10.
[5] 任小赛,常薇,刘斌,等.SiO2/TiO2催化剂的合成及其光催化性能[J].西安工程大学学报,2015,29(6):688-691.
[6] Kistler S S.Coherent expanded aerogels and jellies[J].Nature,1931,127(3211):741.
[7] Kim G S,Hyun S H.Effect of mixing on thermal and mechanical properties of aerogel-PVB composites[J].Journal of Materials Science,2003,38(9):1961-1966.
[8] Pradip B S,Jong K K.Influence of aging conditions on textural properties of water glass based silica aerogels prepared at ambient pressure[J].Kereao J Chem Eng,2010,27(4):1301-1309.
[9] Hrubesh L W.Aerogels applications[J].Journal of Non-crystalline Solids,1998,225(1):335-342.
[10] 胡惠康,甘礼华,李光明,等.超临界干燥技术[J].实验室研究与探索,2000,19(2):33-35.
[11] Yang J,Wang Q,Wang T,et al.Facile one-step precursor-to-aerogel synthesis of silica-doped alumina aerogels with high specific surface area at elevated temperatures[J].Journal of Porous Materials,2017,24(4):889-897.
[12] 陈龙武,甘礼华,侯秀红.SiO2气凝胶的非超临界干燥法制备及其形成过程[J].物理化学学报,2003,19(9):819-823.
[13] 林高用,张栋,卢斌.非超临界干燥法制备块状SiO2气凝胶[J].中南大学学报(自然科学版),2006,37(6):1117-1121.
[14] Ren L,Cui S,Cao F,et al.An easy way to prepare monolithic inorganic oxide aerogels[J].Angew Chem Int Ed Engl,2014,53(38):10147-10149.
[15] He F,Sui C,He X,et al.Facile synthesis of strong alumina-cellulose aerogels by a freeze-drying method[J].Materials Letters,2015,152:9-12.
[16] 盛宇,徐丽慧,沈勇,等.疏水型SiO2/TiO2复合气凝胶的制备及光催化性能研究[J].现代化工,2019,39(2):98-102.
[17] 刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社,2006,34.
[18] 郑阳,廖传华,黄振仁.含湿多孔介质的干燥特性[J].机电信息,2006(4):30-33.
[19] 刘光启,马连湘,刘杰.化学化工物性数据手册有机卷[M].北京:化学工业出版社,2002,5.
[20] 高世桥,刘海鹏.毛细力学[M].北京:科学出版社,2009,35-37.
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