Eco-friendly superabsorbent composite based on sodium alginate and organo-loess with high swelling properties
Eco-friendly superabsorbent composite based on sodium alginate and organo-loess with high swelling properties
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基于海藻酸钠和有机黄土的具有高膨胀性能的环保型高吸水性复合材料
DOI：
10.1039/c5ra07206a
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Lei, Ziqiang
中科院分区：
文献类型：
--
作者：
Ma, Guofu;Ran, Feitian;Lei, Ziqiang
在有机黄土存在下，通过将部分中和的丙烯酸（AA）接枝共聚到海藻酸钠（NaAlg）骨架上，合成了一种具有高溶胀性能的新型超吸水性复合材料。 FTIR光谱、XRD图谱和SEM显微照片证明AA单体接枝到NaAlg主链上，并且有机黄土分散到聚合物基体中，改善了多孔结构，这通过元素图谱得到了验证。 TGA 和 DSC 结果表明，黄土的掺入增强了超吸水剂的热稳定性。溶胀结果证实，高吸水剂中适量的有机黄土可以增强吸水剂的溶胀能力和耐盐性能。掺有 10 wt% 有机黄土的蒸馏水和 0.9 wt% NaCl 水溶液的超吸水性复合材料的最大平衡吸水率分别为 656 g g−1 和 69 g g−1。此外，超吸收性复合材料对4至10范围内的外部pH表现出良好的缓冲能力和保水能力。根据环保型高吸水性复合材料的性能，它可以作为各种领域应用的有前景的候选者。
A novel superabsorbent composite with high swelling properties was synthesized by the grafted co-polymerization of partially neutralized acrylic acid (AA) onto a sodium alginate (NaAlg) backbone in the presence of organo-loess. The FTIR spectra, XRD patterns and SEM micrographs prove that the AA monomers were grafted onto the NaAlg backbone, and the organo-loess dispersed into the polymer matrix that improved the porous structure, which was verified by element mapping. TGA and DSC results indicate that the incorporation of loess enhances the thermal stability of the superabsorbent. Swelling results confirm that proper amount of organo-loess in the superabsorbent can enhance the swelling capability and salt-resistant performance. The maximum equilibrium water absorbency of the superabsorbent composite incorporated with 10 wt% organo-loess in distilled water and 0.9 wt% NaCl aqueous solution were 656 g g−1 and 69 g g−1, respectively. Furthermore, the superabsorbent composite exhibited good buffer ability to external pH in the range from 4 to 10 and water retention ability. According to the performance of the eco-friendly superabsorbent composite, it can be used as a promising candidate for applications in various fields.