纳米纤维素/聚乙烯亚胺水凝胶的制备及对Cr(Ⅵ)的吸附  

Preparation of nanocellulose/polyethyleneimine composite hydrogel and its adsorption of Cr(Ⅵ)

作　　者：蔡晓丹 陈欣玥 管舒仪 兰萌 杨明琰[1,3] CAI Xiao-dan;CHEN Xin-yue;GUAN Shu-yi;LAN Meng;YANG Ming-yan(School of Water and Environment,Chang’an University,Xi’an 710054,China;Shaanxi Provincial Institute of Product Quality Supervision and Inspection,Xi’an 710048,China;Key Laboratory of Underground Hydrology and Ecological Effects in Arid Region,Ministry of Education,Xi’an 710054,China)

机构地区：[1]长安大学水利与环境学院,陕西西安710054 [2]陕西省产品质量监督检验研究院,陕西西安710048 [3]旱区地下水文与生态效应教育部重点实验室,陕西西安710054

出　　处：《应用化工》2023年第2期433-438,共6页Applied Chemical Industry

基　　金：陕西省重点研发计划(2021SF-443)。

摘　　要：以麦秆基纳米纤维素纤丝(cellulose nanofibrils,CNF)和聚乙烯亚胺(PEI)为原料,通过化学交联制备了CNF/PEI(CPH)复合水凝胶。SEM结果表明,复合水凝胶微观形貌为蜂窝状大孔网络结构,红外光谱分析及元素分析表明CPH水凝胶携带大量氨基。将CPH复合水凝胶用于水体中Cr(Ⅵ)的吸附研究,结果表明,pH值为2时,Cr(Ⅵ)吸附效果最优;吸附动力学及等温方程研究结果表明其吸附动力学符合准二级动力学模型,吸附等温方程符合Langmuir模型,在温度为25,35℃时对Cr(Ⅵ)最大吸附容量分别为117.1,123.5 mg/g。经过3次吸附-解吸循环后,其吸附容量可达对照组的70%以上,说明CPH水凝胶具有一定的再生及循环利用性能。研究结果可为农业废弃物的资源化利用及Cr(Ⅵ)污染处理提供理论依据。CNF/PEI composite hydrogel(CPH)was prepared by chemical crosslinking using wheatstraw-based CNF and PEI as materials.The SEM results show that the micromorphology of the composite hydrogel was a honeycomb-like macroporous network structure.FTIR and elemental analysis show that CPH carried a large amount of amino groups.The adsorption of Cr(Ⅵ)results show that the pH 2 is optimal pH.The adsorption kinetics conform to the quasi-secondary kinetics model,the adsorption isothermal equation conforms to the Langmuir model.The maximum adsorption capacity is 117.1 mg/g and 123.5 mg/g at 25,35℃based on Langmuir model,respectively.After three adsorption-desorption cycles,its adsorption capacity is above 70%compared with the control group,indicating that CPH hydrogel has certain regeneration and recycling properties.The research results can provide a theoretical basis for the utilization of agricultural wastes and the treatment of Cr(Ⅵ)pollution.

关 键 词：纳米纤维素纤丝(CNF) 聚乙烯亚胺(PEI) 复合水凝胶 Cr(Ⅵ) 吸附 

分 类 号：TQ352.9[化学工程]