A silsesquioxane-based flexible polyimide aerogel with high hydrophobicity and good adsorption for liquid pollutants in
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A silsesquioxane-based flexible polyimide aerogel with high hydrophobicity and good adsorption for liquid pollutants in wastewater Yumin Wu1, Hui Qiu1, Jiawen Sun2,3, Yupin Wang1, Chuanhui Gao1, and Yuetao Liu1,*
1
State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China 2 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 3 Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Received: 27 July 2020
ABSTRACT
Accepted: 11 October 2020
A type of silsesquioxane-based flexible polyimide aerogel was synthesized by 3,30 ,4,40 -benzophenonetetracarboxylic dianhydride (BTDA), 4,40 -diaminodiphenyl and octa(aminopropylsilsesquioxane) (POSS-NH2) with a facile thermal curing and atmospheric drying process. POSS-NH2 was introduced into the polyimide backbone as a cross-linking agent. The obtained aerogel possessed high hydrophobicity with a water contact angle exceeding 143°. And the aerogels showed good cyclic adsorption capacity for various organic solvents, such as acetone, methanol, ethyl acetate, etc. After 15 adsorption experiments, the original adsorption capacity of the aerogels (more than 3 times their own weight) was still maintained. SEM and BET confirmed that the introduction of POSS-NH2 could form a larger pore structure inside the aerogel, thereby achieving an improvement in adsorption performance. The results indicated this kind of aerogel might be flexibly utilized as adsorbent materials for oil pollutants and harmful organic reagents in the field of wastewater treatment.
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Handling Editor: Chris Cornelius.
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https://doi.org/10.1007/s10853-020-05460-2
J Mater Sci
GRAPHIC ABSTRACT
Introduction With the rapid development of industry, water pollution is becoming increasingly serious and human beings are facing the reality of water shortage [1–3]. In order to remove the harmful substances (toxic organics, oil pollutants) in wastewater, researchers have adopted various methods, such as physical or chemical treatment methods [4, 5], including adsorption [6, 7], filtration [8, 9], ion exchange [10, 11] and membrane separation [12], etc. It’s well-known that the adsorption method was widely used as a simple and efficient method. Aerogels, discovered in twentieth century, were a novel kind of inorganic non-metallic materials with
representative pore structure (about 95% of its volume) and three-dimensional network [13, 14]. The traditional preparation methods of aerogels include freeze-drying and supercritical drying, but there are many disadvantages such as harsh operating conditions, high installation costs and large safety risks. The emerging technology, represented by atmospheric drying technology [15], greatly reduces the cost in the preparation process, which made aero
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