The removal of dye and toxic ionic pollutants from water is an extremely important issue that requires systematic and efficient adsorbent preparation strategies. To address this challenge, we developed composite chitosan (CS)-based hydrogels containing hyper-crosslinked polymer (HCP) particles to be used as broad-spectrum adsorbents. The goal is to efficiently combine the dye adsorption ability of chitosan and the capacity of the porous particles of trapping pollutant molecules. The HCP particles are well distributed and firmly embedded into the chitosan matrix and the composite hydrogels exhibit improved mechanical properties. Adsorption experiments reveal a synergistic effect between CS and HCP particles, and the samples are able to remove both anionic and cationic dyes (indigo carmine, rhodamine 6G and sunset yellow) from water. The maximum dye uptake is higher than that of comparable biosorbents. Moreover, the mechanical properties of the composite hydrogels are enhanced respect to pure CS, and the samples can be regenerated and reused keeping their adsorption ability unaltered over successive cycles of adsorption, desorption, and washing.

中文翻译：

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嵌入超交联聚合物颗粒的壳聚糖水凝胶，作为可重复使用的广谱吸附剂，用于去除染料

从水中去除染料和有毒离子污染物是一个非常重要的问题，需要系统有效的吸附剂制备策略。为了解决这一挑战，我们开发了基于壳聚糖（CS）的复合水凝胶，其中包含超交联聚合物（HCP）颗粒，可用作广谱吸附剂。目的是有效地结合壳聚糖的染料吸附能力和捕获污染物分子的多孔颗粒的能力。HCP颗粒分布均匀并牢固地嵌入壳聚糖基质中，复合水凝胶显示出改善的机械性能。吸附实验揭示了CS和HCP颗粒之间的协同作用，并且样品能够从水中去除阴离子和阳离子染料（靛红胭脂红，若丹明6G和日落黄）。最大染料吸收量高于同类生物吸附剂。而且，相对于纯CS而言，复合水凝胶的机械性能得到了增强，并且样品可以进行再生和再利用，从而在连续的吸附，解吸和洗涤循环中保持其吸附能力不变。