高疏水纳米纤维素-壳聚糖/膨润土气凝胶的构建及其高效油水分离的应用
Construction of highly hydrophobic nanocellulose-chitosan/bentonite aerogel and its application of efficient oil-water separation
徐诗琪 1周洲 2汤睿 3江露莹 1王俊辉 1金学群 2张菁玮 1廖丹葵 3童张法 3张寒冰1
作者信息
- 1. 广西大学 资源环境与材料学院,南宁 530004
- 2. 崇左南方水泥有限公司,广西钙基材料协同创新中心,崇左 532200
- 3. 广西大学 化学化工学院,广西钙基材料协同创新中心,南宁 530004
- 折叠
摘要
气凝胶具有高孔隙率和高吸附性的特点,因此在含油废水处理领域是一种具有前景的候选材料.目前,所报道的气凝胶仍存在机械强度不足、制作工艺复杂、制备成本高等问题,限制了气凝胶在油水分离领域的应用.膨润土(Bentonite,BT)具有价格低、来源丰富、机械性能优良等特点,能够有效地改善气凝胶的机械性能.本文通过简单的冷冻干燥-常温浸渍法,在羧基纤维素纳米纤维(Carboxycellulose nanofibres,CNF-C)与壳聚糖(Chitosan,CS)的交联网络上引入剥离膨润土(Exfoliated bentonite,BTex),合成了疏水的纳米纤维素-壳聚糖/剥离膨润土气凝胶(CNC/BTex).制备出的CNC/BTex气凝胶表现出优异的疏水性能(水接触角高达 133°);经过挤压后在 5 s内可恢复形变,具有良好的力学性能;对不同油品(正己烷、环己烷、二氯甲烷、食用油和发动机油)的吸附容量为 18.48～40.20 g·g-1 不等.以二氯甲烷和环己烷为主要研究对象,经过 5次循环使用后依然保持稳定的吸油性能(维持在原始吸附量的 90％).本文的工作为制备低成本、高性能的油水分离吸附材料提供了参考.
Abstract
Due to the high porosity and high absorption characteristics,aerogel has been a promising candidate material in the field of oily wastewater treatment.However,the reported aerogels were still suffering from insuffi-cient mechanical strength,complicated fabrication process and high preparation cost,which limited the applica-tion of aerogels in the field of oil-water separation.Bentonite(BT)has the characteristics of low price,abundant source and excellent mechanical properties,which can effectively improve the mechanical properties of aerogels.In this paper,hydrophobic nanocellulose-chitosan/exfoliated bentonite aerogels(CNC/BTex)were synthesized by introducing exfoliated bentonite(BTex)onto a cross-linked network of carboxycellulose nanofibres(CNF-C)and chitosan(CS)by a simple freeze-drying and ambient temperature impregnation method.The prepared CNC/BTex aerogel exhibited excellent hydrophobic properties(water contact angle 133°),recovered deformation within 5 s after extrusion and showed good mechanical properties.The adsorption capacities for different oils(hexane,cyclo-hexane,dichloromethane,cooking oil and engine oil)ranged from 18.48-40.20 g·g-1.Using dichloromethane and cyclohexane as the main research objects,the oil adsorption performance remained stable(90％of the original adsorption capacity)after five cycles of use.In summary,the present work provides a reference for the preparation of low-cost and high-performance adsorbent materials for oil-water separation.
关键词
油水分离/气凝胶/纤维素/壳聚糖/剥离膨润土Key words
oil-water separation/aerogel/cellulose/chitosan/exfoliated bentonite引用本文复制引用
基金项目
国家自然科学基金项目(52263029)
广西自然科学基金项目(2021GXNSFAA220035)
广西自然科学基金项目(2020GXNSFAA297036)
广西石化资源加工及过程强化技术重点实验室主任基金(2022Z005)
钙基材料协同创新中心横向科研项目(GJZX2022-2)
出版年
2024
NETL
NSTL
万方数据