Junlapong Kanda, Maijan Pattarawadee, Chaibundit Chiraphon, Chantarak Sirinya
Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand, 90110.
Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand, 90110.
Int J Biol Macromol. 2020 May 1;158:258-264. doi: 10.1016/j.ijbiomac.2020.04.247.
Superabsorbent hydrogels were synthesized from cassava starch (CS) and polyacrylamide (PAM) via radical polymerization. Scanning electron microscope revealed the porous structure of the hydrogels. Pore size was smaller at higher CS contents. Hydrogel containing 50 wt% CS (CS50) showed excellent water absorbency of >8000%, which was much greater than that of CS0 (pure PAM) hydrogel. This CS50 hydrogel removed >85% of methylene blue (MB) in <10 h with the greatest adsorption capacity of 2000 mg MB/g. The experimental results fitted the Freundlich and pseudo-second order models. After 4 cycles of use, the hydrogel could still remove >50% of MB in solution. Interestingly, the hydrogels were photodegradable and biodegradable. Buried in soil, the CS50 hydrogel was 80% degraded within 30 days whereas pure PAM was only 22% degraded.
通过自由基聚合反应，由木薯淀粉（CS）和聚丙烯酰胺（PAM）合成了高吸水性水凝胶。扫描电子显微镜揭示了水凝胶的多孔结构。在较高的CS含量下，孔径较小。含有50 wt% CS的水凝胶（CS50）表现出大于8000%的优异吸水性，这远高于CS0（纯PAM）水凝胶。这种CS50水凝胶在不到10小时内去除了>85%的亚甲基蓝（MB），最大吸附容量为2000 mg MB/g。实验结果符合Freundlich模型和准二级模型。经过4次使用循环后，水凝胶仍能去除溶液中>50%的MB。有趣的是，这些水凝胶具有光降解性和生物降解性。埋在土壤中，CS50水凝胶在30天内降解了80%，而纯PAM仅降解了22%。
