Chan Kayee, Kawai Masami, Yamake Mina, Zinchenko Anatoly
Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.
Gifu High School, 3-1, Onawaba, Gifu 500-8889, Japan.
Gels. 2023 Nov 3;9(11):874. doi: 10.3390/gels9110874.
Despite the tremendous progress in the development of functional materials from plastic waste to promote its recycling, only a few examples of hydrogel materials from plastic waste were reported. In this study, microwave-assisted depolymerization of waste PET plastic using polyamine was performed to prepare short aminophthalamide oligomers followed by chemically cross-linking into a hydrogel material. Catalyst-free microwave-assisted aminolysis of PET was completed within 30-40 s, demonstrating high efficiency of the depolymerization reaction. Subsequent epoxy cross-linking of the oligomers yielded a hydrogel with a swelling degree of ca. 92.1 times in pure water. The application of the obtained hydrogel for the removal of copper ions (Cu) from water was demonstrated. Efficient complexation of NH groups of the hydrogel with Cu resulted in high adsorption capacities of the hydrogel material toward Cu removal, which were the highest at neutral pHs and reached ca. 213 mg/g. The proposed type of environmental material is beneficial owing to its waste-derived nature and functionality that can be applied for the high-efficiency removal of a broad scope of known environmental pollutants.
尽管在开发用于促进塑料废物回收的功能材料方面取得了巨大进展，但从塑料废物中制备水凝胶材料的例子却很少。在本研究中，使用多胺对废PET塑料进行微波辅助解聚，以制备短链氨基邻苯二甲酰胺低聚物，然后通过化学交联形成水凝胶材料。无催化剂的PET微波辅助氨解在30-40秒内完成，证明了解聚反应的高效率。随后，低聚物的环氧交联产生了一种在纯水中溶胀度约为92.1倍的水凝胶。展示了所制备的水凝胶在去除水中铜离子（Cu）方面的应用。水凝胶的NH基团与Cu的有效络合导致水凝胶材料对Cu去除具有高吸附容量，在中性pH值下最高，达到约213 mg/g。所提出的这种环境材料因其源自废物的性质和可用于高效去除广泛已知环境污染物的功能而具有优势。
