Yi Ju-Zhen, Ma Yu-Qian, Zhang Li-Ming
School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China.
Bioresour Technol. 2008 Sep;99(13):5362-7. doi: 10.1016/j.biortech.2007.11.020. Epub 2007 Dec 21.
A series of novel sodium humate/poly(N-isopropylacrylamide) (SH/PNIPA) hydrogels were synthesized by solution polymerization. The swelling and decoloring properties of SH/PNIPA hydrogels were also examined. Experiment results show that there exist hydrogen-bonding interactions between SH and PNIPA in the SH/PNIPA hydrogels network, which are not strong enough to disrupt the aggregation of dehydrated PNIPA chains at phase transition temperature, leading to the same volume phase transition temperature as pure PNIPA hydrogel. The adsorption and desorption of methylene blue (MB) for the hydrogels were influenced by temperature, initial MB concentration and SH amount. Low temperature favors the adsorption and desorption of MB. Appropriate SH amount of the hydrogels is crucial for the adsorption and desorption of MB. The maximum adsorption capacity was 10.8 mg MB per gram of SH/PNIPA gel.
通过溶液聚合合成了一系列新型腐植酸钠/聚（N-异丙基丙烯酰胺）（SH/PNIPA）水凝胶。还研究了SH/PNIPA水凝胶的溶胀和脱色性能。实验结果表明，在SH/PNIPA水凝胶网络中，SH与PNIPA之间存在氢键相互作用，但这种相互作用不够强，不足以破坏脱水PNIPA链在相变温度下的聚集，导致其与纯PNIPA水凝胶具有相同的体积相变温度。水凝胶对亚甲基蓝（MB）的吸附和解吸受温度、初始MB浓度和SH用量的影响。低温有利于MB的吸附和解吸。水凝胶中适当的SH用量对MB的吸附和解吸至关重要。最大吸附容量为每克SH/PNIPA凝胶吸附10.8 mg MB。
