羟乙基纤维素水凝胶的制备及吸附性能

以羟乙基纤维素(HEC)(作为水凝胶的骨架增强水凝胶的强度)和丙烯酸(AA)为原料,过氧化氢/维生素C混合溶液作为氧化还原引发剂,通过自由基聚合的方法制备HEC–AA水凝胶。通过傅里叶变换红外光谱对HEC–AA水凝胶的结构进行了表征,分析表明水凝胶内部存在氢键。通过扫描电子显微镜对HEC–AA水凝胶的微观结构进行研究,结果表明HEC–AA水凝胶内部形成了三维网状结构,其孔径尺寸随着HEC用量的增加而减小。通过对HEC–AA水凝胶的吸水和Cu²⁺吸附性能测试表明,当HEC用量为0.3 g时,HEC–AA水凝胶的吸水性能和对Cu²⁺吸附能力最好。对盐溶液敏感性的测试表明,HEC–AA水凝胶的吸水性能会随着盐溶液浓度的增加而降低。Cu²⁺的初始浓度和pH值对吸附性能影响的测试结果表明,当HEC用量为0.3 g,pH值为5,Cu2+初始浓度为100 mg/L时,水凝胶的吸附容量最大为82.3 mg/g。HEC–AA水凝胶在重金属吸附领域具有良好的应用前景。

Preparation of Hydroxyethyl Cellulose Hydrogel for Adsorption Performance

Hydroxyethyl cellulose(HEC)and acrylic acid(AA)were used as raw materials,the hydrogen peroxide/vitamin C mixed solution was used as a redox initiator,HEC–AA hydrogel was prepared by free radical polymerization.HEC as the backbone of the hydrogel enhances the strength of the hydrogel.The structure of the hydrogel was characterized by FTIR,and the analysis show that there are hydrogen bonds in the hydrogel.The microstructure of the hydrogel was studied by SEM,and the results show that a three-dimensional network structure is formed inside the hydrogel,and its pore size decreases with the increase of HEC content.The water absorption and Cu2+adsorption performance tests of the hydrogel show that when the HEC content is 0.3 g,the water absorption and Cu²⁺adsorption capacity of the hydrogel are the best.The test of sensitivity to salt solution shows that the water absorption performance of the hydrogel decreases with the increase of salt solution concentration.The test results of the Cu²⁺ initial concentration and pH value on the adsorption performance show that when the HEC content is 0.3 g,the pH value is 5 and the Cu²⁺ initial concentration is 100 mg/L,the maximum adsorption capacity of the hydrogel is 82.3 mg/g.The prepared HEC–AA hydrogel has good application prospects in the field of heavy metal adsorption.