1 CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China 2 College of Materials, Xiamen University, Xiamen 361005, China 3 Fujian Key Laboratory of Advanced Materials, Xiamen 361005, China
Abstract: Silica aerogel, as a kind of ultralight porous material, has the characteristics of extremely low density, ultra-high porosity and large specific surface area, which is an excellent adsorbent carrier. However,the surface of silica aerogel skeleton is mainly composed of silicon hydroxyl groups, which has poor adsorptive selectivity and low adsorption capacity for pollutants. In this work, an excellent adsorbent was developed by functional modification of silica aerogel with amine group. Anion dye Congo red was used as model pollutant. Results showed that the amine-modified silica aerogel had excellent adsorption performance, of which the maximum adsorption capacity for Congo red could reach 800—900 mg/g according to Langmiur isotherm model in a wide pH range of 3—9. The adsorption kinetics of Congo red on the amine-modified silica aerogel was fast, which could be well described with pseudo-second-order kinetics model, and more than 80% of the maximum adsorption capacity was obtained within 1 h. According to dynamic adsorption experiments, the amine-modified silica aerogel showed excellent dynamic adsorption capacity. Results showed the amine-modified silica aerogel is promising adsorbent for anion dye.
应宗耀, 郑煜铭, 邵再东, 程璇. 胺基改性二氧化硅气凝胶的制备及对刚果红的吸附性能[J]. 材料导报, 2021, 35(20): 20005-20010.
YING Zongyao, ZHENG Yuming, SHAO Zaidong, CHENG Xuan. Study on the Preparation of Amine-modified Silica Aerogel and Its Adsorption Performance for Removing Congo Red from Water. Materials Reports, 2021, 35(20): 20005-20010.
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2021, Vol. 35 
