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林产化学与工业 ›› 2020, Vol. 40 ›› Issue (3): 52-60.doi: 10.3969/j.issn.0253-2417.2020.03.007

• 研究报告 • 上一篇    下一篇

高吸液性木质纤维气凝胶的制备及表征

伍锦秀,董勇,夏剑雨,陈妍,曹云峰,刘祝兰*()   

  1. 南京林业大学 江苏省制浆造纸科学与技术重点实验室; 江苏省林业资源高效加工利用协同创新中心, 江苏 南京 210037
  • 收稿日期:2020-01-19 出版日期:2020-06-28 发布日期:2020-06-29
  • 通讯作者: 刘祝兰 E-mail:liuzhulan6202@sina.com
  • 作者简介:伍锦秀(1995-),女,安徽铜陵人,硕士生,主要从事制浆造纸工程及生物质新材料研究工作
  • 基金资助:
    国家自然科学基金资助项目(31600473);江苏省自然科学基金资助项目(BK20160928);江苏高校优势学科建设工程资助项目

Preparation and Characterization of Lignocellulosic Aerogel with High Liquid Absorbability

Jinxiu WU,Yong DONG,Jianyu XIA,Yan CHEN,Yunfeng CAO,Zhulan LIU*()   

  1. Jiangsu Provincial Key Lab. of Pulp and Paper Science and Technology; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-01-19 Online:2020-06-28 Published:2020-06-29
  • Contact: Zhulan LIU E-mail:liuzhulan6202@sina.com

摘要:

大豆秸秆经乙二胺(EDA)预处理后以不同质量分数(1%、2%、3%和4%)溶解在LiCl/DMSO中,经乙醇凝胶化后冷冻干燥,制得高吸液性木质纤维气凝胶(SBS-AG-1~SBS-AG-4),并对其微观形貌、多孔性及吸水吸油等性能进行测试和表征。结果表明:木质纤维质量分数较高(4%)时,气凝胶比表面积较大且强度较好,SBS-AG-4的比表面积、压缩强度和储能模量分别为198.52 m2/g、135.56 kPa(50%应变)和798.91 kPa(剪切应力为100 Pa),但纤维网络交织紧密,孔径减小,吸液性能降低,其在30 s内对水、柴油和硅油的吸附倍率分别为8.45、5.77和6.39 g/g;而在木质纤维质量分数较低(1%)时,气凝胶内部网络结构疏松程度增加且孔径较大,有助于提高气凝胶吸液倍率和速率,SBS-AG-1可在30 s内对水、柴油和硅油达到平衡吸附,吸附倍率分别高达22.63、18.57和21.53 g/g。

关键词: 乙二胺, LiCl/DMSO, 木质纤维气凝胶, 高吸液性

Abstract:

Ethylenediamine (EDA) pretreated soybean pretreated with ethylenediamine (EDA) stem was dissolved in LiCl/DMSO with different mass fractions (1%, 2%, 3% and 4%), then was gelated in ethanol and freeze-dried to prepare lignocellulose aerogels (SBS-AG-1-SBS-AG-4) with high liquid absorption capacity, and the microstructure, porosity and absorption of these aerogels were tested and characterized in detail. The results showed that if the lignocellulose was dissolved with relatively higher mass fraction (4%), the aerogel could be fabricated with larger specific surface area and better mechanical strength, but formed the denser fiber interwoven network structure, smaller aperture and lower absorbability, its specific surface area, compression strength and energy storage modulus were 198.52 m2/g, 135.56 kPa(50%strain) and 798.91 kPa(shear stress 100 Pa), and the adsorption rates for water, diesel and silicone oil within 30s were 8.45, 5.77 and 6.39 g/g, respectively. While, for the obtained aerogels obtained with containing lower lignocellulose mass fraction (1%), their looser internal network structure and larger pore size could help to improve liquid absorption capacity, Moreover, SBS-AG-1 could achieve equilibrium adsorption of water, diesel and silicone oil within 30 s, and its their adsorption rates were as high as 22.63, 18.57 and 21.53 g/g.

Key words: ethylenediamine, LiCl/DMSO, lignocellulosic aerogel, high liquid absorbability

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