利用溶胶-凝胶法调节pH及添加PEG优化酒精纯化用SiO2粉末

波谱学杂志 ›› 2014, Vol. 31 ›› Issue (1): 7-19.

利用溶胶-凝胶法调节pH及添加PEG优化酒精纯化用SiO₂粉末

吴政宪¹，郑建星²，郑人豪¹，丁尚武^1*

1. 台湾中山大学化学系，台湾高雄80424；2. 远东科技大学材料科学与工程系，台湾台南744

收稿日期:2013-10-17 修回日期:2013-11-04 出版日期:2014-03-05 发布日期:2014-03-05
作者简介:WU Cheng-hsien(1966-), male, born in Taiwan, PhD., his research focuses on alcohol and tobacco products. *通讯联系人：丁尚武，电话: +886-7-525-3917, 传真: +886-7-525-3909, E-mail: ding@mail.nsysu.edu.tw.
基金资助:

Optimizing Sol-Gel Derived SiO₂ Powders for Purification of Ethanol by Tuning pH and Addition of Polyethylene Glycol

WU Cheng-hsien¹，JENG Jiann-shing²，CHENG Ren-hao¹，DING Shang-wu^1*

1. Department of Chemistry and Center for Nanoscience and Nanotechnology, Sun Yat-sen University of Taiwan, Kaohsiung 80424, China; 2. Department of Materials Science and Engineering, Far East University, Tainan 744, China

Received:2013-10-17 Revised:2013-11-04 Online:2014-03-05 Published:2014-03-05
About author:WU Cheng-hsien(1966-), male, born in Taiwan, PhD., his research focuses on alcohol and tobacco products. *Corresponding author: DING Shang-wu, Tel: +886-7-525-3917, Fax: +886-7-525-3909, E-mail: ding@mail.sysu.edu.tw.
Supported by:

摘要/Abstract

摘要：

该工作探讨利用TEOS前驱液及不同含量、不同分子量PEG制备出SiO₂粉末的性质．SiO₂粉末由溶胶-凝胶法制备，并结合退火前后烘干．TEOS前驱溶液的水解及缩合反应速率在pH=3时比在pH=5, 7, 9时进行得更彻底，且随温度及PEG分子量的升高而升高；粉末产率在TEOS前驱液pH=3时达到最大．与不加PEG的溶胶-凝胶法制备出的样品相比，加入PEG制备的粉末有更高的吸水能力．若粉末从高至500℃退火，则可发现乙醇浓度增加．依据液体和固体NMR、电子显微镜以及BET结果，对吸水及粉末表面积之间的关系进行了讨论．

关键词: 核磁共振(NMR), BET, 电子显微镜(SEM), 多孔材料, 有机-无机混成材料, 酒精纯化, 溶胶-凝胶法

Abstract:

This study explores the properties of the SiO₂ powders prepared from tetraethyl orthosilicate (TEOS) pre-solution with and without incorporating polyethylene (PEG) of different molecular weights. SiO₂ powders were prepared by the sol-gel method in combination with oven-drying before and after annealing. The hydrolysis and condensation reactions of TEOS pre-solution at pH 3 occur more thoroughly than that at pH 5, 7, and 9. The rate of hydrolysis and
condensation is found to increase with temperature and the molecular weight of PEG for pre-solution and a maximum in the powder yield is reached for TEOS pre-solution at pH 3. The powder prepared from the TEOS pre-solution added with PEG is superior to that without adding PEG, with a higher water adsorption capacity. With the powders annealed at a temperature up to 500 ^oC, the ethanol concentration was found to be increased. In addition, the relation between water adsorption and surface area of SiO₂ powders for purification of ethanol is discussed based on both liquid and solid state nuclear magnetic resonance (NMR) spectroscopies, scanning electron microcopy (SEM) and BET.

Key words: NMR, BET, SEM, porous material, organic-inorganic hybrid material, ethanol, sol-gel

中图分类号:

O482.53

吴政宪, 郑建星, 郑人豪, 丁尚武. 利用溶胶-凝胶法调节pH及添加PEG优化酒精纯化用SiO₂粉末[J]. 波谱学杂志, 2014, 31(1): 7-19.

WU Cheng-hsien, JENG Jiann-shing, CHENG Ren-hao, DING Shang-wu. Optimizing Sol-Gel Derived SiO₂ Powders for Purification of Ethanol by Tuning pH and Addition of Polyethylene Glycol[J]. Chinese Journal of Magnetic Resonance, 2014, 31(1): 7-19.

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利用溶胶-凝胶法调节pH及添加PEG优化酒精纯化用SiO₂粉末

Optimizing Sol-Gel Derived SiO₂ Powders for Purification of Ethanol by Tuning pH and Addition of Polyethylene Glycol

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