腐植酸钠/聚N-异丙基丙烯酰胺水凝胶的合成及脱色性能研究

Synthesis and Decoloring Properties of Sodium Humate/Polyisopropylacrylamide Hydrogels

以过硫酸铵为引发剂、N,N′-亚甲基双丙烯酰胺为交联剂、N-异丙基丙烯酰胺单体和腐植酸钠为原料,用溶液聚合交联法合成了温敏腐植酸钠/聚N-异丙基丙烯酰胺(SH/PNIPA)系列水凝胶。用红外光谱分析仪对其内部相互作用进行了研究,并用紫外可见分光光度计对水凝胶吸附-解吸亚甲基蓝的性能进行了测试。实验结果表明凝胶中SH与PNIPA形成了氢键;凝胶对亚甲基蓝(MB)的吸附和解吸能力受腐植酸钠的含量、亚甲基蓝的起始浓度和温度的影响;每克干的SH0.03凝胶最大可吸附亚甲基蓝10.8 mg。

A series of sodium humate/polyisopropylacrylamide （SH/PNIPA） hydrogels was synthesized by solution polymerization using acrylamide and sodium humate （SH） as raw materials, ammonium persulfate （APS） as the initiator and N,N＇-methylenebisacrylamide （MBA） as the crosslinker. Their swelling property and decoloring property were examined. Experiment results show that there exist hydrogen bonding between SH and PNIPA; the absorption and desorption of methylene blue （MB） for hydrogels were influenced by temperature, initial MB concentration and SH content. The maximum absorption capacity was 10. 8 mg MB per gram of SH/PNIPA gel.