将N-羟甲基丙烯酰胺引入聚丙烯酸-丙烯酰胺体系,采用“一锅煮”法合成了P(N-MAAm)水凝胶。结果显示,当 n(AM)∶n(AA)为1∶4、中和度为60%、交联剂用量为0.4%、n(AM)∶n(N-MA)=9.5∶0.5时,P(N-MAAm)对亚甲基蓝(MB)的实测最大吸附量可达1 603.77 mg/g;降低环境温度、盐度,提高pH有利于P(N-MAAm)水凝胶吸附MB;吸附动力学曲线符合准一级动力学模型(R₁>0.999),吸附等温线更符合Langmuir模型(R_L>0.981),P(N-MAAm)水凝胶对MB的吸附过程更倾向于是物理吸附,并且可能是多分子层吸附。P(N-MAAm)水凝胶通过Langmuir模型拟合计算得到理论最大吸附量为3 170.27 mg/g;具有良好的可重复利用性能,5次吸附-解吸循环后对MB的去除率仍高于95%。

By adding N-methylolacrylamide into polyacrylic acid-polyacrylamide system,P(N-MAAm) hydrogel is synthesized through the "one-pot" method.Results show that the maximum adsorption capacity of P(N-MAAm) hydrogel to methyl blue can reach 1 603.77 mg·g^-1 when the ratio of acrylamide to acrylic acid is 1∶4,the neutralization degree is 60%,the crosslinker dosage is 0.4%,and the ratio of acrylamide to N-methylolacrylamide is 9.5∶0.5.Lower environmental temperature,lower salinity,and higher pH favor the adsorption of methylene blue by P(N-MAAm) hydrogel.The adsorption kinetics curve conforms to the pseudo-first-order kinetic model (R₁ > 0.999),and the adsorption isotherm can be better described by Langmuir model (R_L>0.981).The adsorption process of methylene blue by P(N-MAAm) hydrogel tends to be physical adsorption,furthermore possibly multilayer adsorption.According to Langmuir model fitting,the theoretical maximum adsorption capacity of P(N-MAAm) hydrogel is 3 170.27 mg·g^-1. P(N-MAAm) hydrogel also demonstrates excellent reusability,delivering an above 95% removal rate to methylene blue after five adsorption-desorption cycles.

韩志成(1997-),男,硕士生,研究方向为聚丙烯酰胺类水凝胶吸附材料,593849110@qq.com;于良民(1964-),男,博士,教授,研究方向为环境友好型海洋防护材料与应用技术、先进高分子复合材料、类天然产物及其生态特性,通讯联系人,yuyan@ouc.edu.cn。