Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, PR China; School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, PR China.
School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, PR China.
Int J Biol Macromol. 2022 Nov 30;221:821-830. doi: 10.1016/j.ijbiomac.2022.09.022. Epub 2022 Sep 9.
In this study, an interpenetrating double-network hydrogel (LMP/AA/PVAH) was prepared based on low methoxy pectin (LMP), acrylic acid (AA) and polyvinyl alcohol (PVA). The first rigid network of chemical crosslinking was constructed via free radical polymerization of LMP and AA, and the second of ductile physical crosslinking network was constructed via cyclic freeze-thaw of PVA. The first cycle hardness and elasticity of the LMP/AA/PVAH significantly increased from 13.08 N and 0 to 24.28 N and 0.79, respectively, when the second network structure was constructed in the hydrogel by PVA. Besides, the PVA network might enhance the ductile and limit the swelling of hydrogel. In addition, the adsorption properties of LMP/AA/PVAH were evaluated by adsorption of methylene blue (MB). The adsorption behavior of MB by LMP/AA/PVAH conformed to the pseudo-second-order kinetic model. Besides, after 4 cycles of adsorption, there was no significant difference in adsorption capacity of LMP/AA/PVAH. The results showed that LMP/AA/PVAH had good reusability.
在这项研究中，基于低甲氧基果胶（LMP）、丙烯酸（AA）和聚乙烯醇（PVA）制备了互穿双网络水凝胶（LMP/AA/PVAH）。通过 LMP 和 AA 的自由基聚合构建了第一个刚性化学交联网络，通过 PVA 的循环冷冻-解冻构建了第二个柔韧的物理交联网络。当 PVA 在水凝胶中构建第二个网络结构时，LMP/AA/PVAH 的第一循环硬度和弹性分别从 13.08 N 和 0 显著增加到 24.28 N 和 0.79。此外，PVA 网络可能增强了水凝胶的韧性并限制了其溶胀。此外，通过亚甲基蓝（MB）的吸附评估了 LMP/AA/PVAH 的吸附性能。LMP/AA/PVAH 对 MB 的吸附行为符合拟二级动力学模型。此外，经过 4 次吸附循环后，LMP/AA/PVAH 的吸附容量没有明显差异。结果表明，LMP/AA/PVAH 具有良好的重复使用性。
