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Chemistry and Industry of Forest Products ›› 2020, Vol. 40 ›› Issue (3): 52-60.doi: 10.3969/j.issn.0253-2417.2020.03.007

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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

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

CLC Number: