氨化纤维素基气凝胶的制备及其对阿散酸的吸附行为研究

Preparation of Ammoniated Cellulose Aerogel and Its Adsorption Behavior for p-Arsanilic Acid

关键词:  纤维素基气凝胶  聚乙烯亚胺  吸附  阿散酸

Key Words:cellulose-based aerogel  polyethyleneimine  adsorption  p-arsanilic acid

摘要:以纤维素为原料，利用表面氨化交联聚乙烯亚胺（PEI）制备了一种对阿散酸（p-ASA）具有高效吸附效果的功能化纤维素基气凝胶（Cell@PEI）。结果表明，三维块状的Cell@PEI具有独特的多孔结构、较大的比表面积（241.4 m²/g），且PEI的引入丰富了气凝胶表面的官能团，增强了Cell@PEI中的静电和氢键相互作用，促进了其对p-ASA的吸附。Cell@PEI对p-ASA的吸附符合Freundlich吸附等温模型和准二级吸附动力学模型，最大吸附量为205.6 mg/g。利用NaOH溶液对Cell@PEI气凝胶进行解吸再生5次后，其对p-ASA的去除率仍在70%以上。

Abstract:A functionalized cellulose-based aerogel （Cell@PEI） with high adsorption efficiency for p-arsanilic acid （p-ASA） was fabricated by crosslinking surface ammoniated polyethyleneimine （PEI） with cellulose. The results showed that the three-dimensional massive Cell@PEI had a unique porous structure with a large specific surface area of 241.4 m²/g. Moreover， the introduction of PEI enriched the functional groups on the surface of the aerogel， enhanced the electrostatic interaction and hydrogen bonding in Cell@PEI， promoting the adsorption towards p-ASA. The adsorption capacity of Cell@PEI was 205.6 mg/g in maximum， which was in accordance with the Freundlich adsorption isotherm model and pseudo-second-order adsorption kinetics model. In addition， the removal of p-ASA was still above 70% by Cell@PEI aerogel after desorption and regeneration in NaOH solution for 5 times.