Adsorption performance of hydrophobic/hydrophilic silica aerogel for low concentration organic pollutant in aqueous solution

Nanotechnology Reviews

article

Zhigang Yi¹  Qiong Tang¹  Tao Jiang¹  Ying Cheng¹ 

[1] Department of Chemistry, Leshan Normal University

关键词: Silica aerogels;    Adsorbent;    Organic pollutant;   

DOI  :  10.1515/ntrev-2019-0025

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Hydrophobic silica aerogels (SiO 2 (AG)) was prepared via sol-gel and solvent exchange method under ambient pressure, which could be transformed to hydrophilic after heated under 500 ∘ C. Heat treatment cannot change its structure. SiO 2 (AG) samples were the micro-porous structure formed by numerous fine particles and had high specific surface area, pore size and pore volume. The absorption performance of hydrophobic/hydrophilic SiO 2 (AG) on nitrobenzene, phenol and methylene blue (MB) showed that hydrophobic SiO 2 (AG) exhibited strong adsorption capacity on slightly soluble organic compounds, while hydrophilic SiO 2 (AG) was much more effective on adsorbing soluble compounds, which could be analyzed by the hydrophobic and hydrophilic interaction theory between the adsorbent and adsorbate.Hydrophobic/hydrophilic SiO 2 (AG) adsorption performance for MB is superior to that for phenol, which could be explained via the electrostatic interaction theory.

【 授权许可】

CC BY