论文部分内容阅读
以丙烯酸(AA)和壳聚糖(CS)为原料,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,利用辉光放电电解等离子体(GDEP)技术在水溶液中一步引发制备了壳聚糖/聚丙烯酸(CS/PAA)水凝胶。采用FTIR、XRD和SEM对水凝胶的结构和形貌进行了表征,考察了溶液p H、吸附时间和初始质量浓度对Cu~(2+)和Cd~(2+)吸附的影响,探讨了水凝胶的重复利用性。结果表明:AA成功接枝到了CS链上,形成了具有多孔三维网络结构的CS/PAA水凝胶;该水凝胶对Cu~(2+)和Cd~(2+)的吸附符合准二级动力学模型和Langmuir吸附等温式;在最佳吸附p H下(p H=4.3),吸附120 min,CS/PAA水凝胶对Cu~(2+)和Cd~(2+)的最大实际吸附量分别为151.2和298.8 mg/g;该水凝胶在0.015mol/L乙二胺四乙酸四钠(EDTA-4Na)溶液中吸附解吸4次后,吸附量变化不大,说明CS/PAA水凝胶具有优异的再生和重复利用性。
Acrylic acid (AA) and chitosan (CS) as raw materials, N, N’-methylenebisacrylamide (MBA) as a cross-linking agent, using glow discharge plasma electrolysis (GDEP) Chitosan / polyacrylic acid (CS / PAA) hydrogels were prepared. The structure and morphology of the hydrogels were characterized by FTIR, XRD and SEM. The effects of p H, adsorption time and initial mass concentration on the adsorption of Cu 2+ and Cd 2+ were investigated. The reusability of the hydrogel. The results showed that AA was successfully grafted onto the CS chain to form a CS / PAA hydrogel with porous three-dimensional network structure. The adsorption of Cu 2+ and Cd 2+ by the hydrogel was in accordance with the standard two Kinetic model and Langmuir adsorption isotherm. The maximum adsorption of Cu 2+ and Cd 2+ by CS / PAA hydrogels was obtained at 120 h after adsorption at p H = 4.3 (p H = 4.3) The actual adsorption amount was 151.2 and 298.8 mg / g, respectively. After adsorption and desorption for four times in 0.015 mol / L EDTA-4Na solution, the adsorption amount of the hydrogel did not change much, indicating that CS / PAA hydrogel has excellent regeneration and reusability.