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

Abstract

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

CLC Number:

O482.53

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

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