工业废水的非达标排放使重金属污染已成为严重的水环境问题之一。由于传统吸附材料难以对废水中Cd(II)实现高效去除和资源化回收，本申请针对以上问题，拟通过对Agar和PSS两种独立网络的设计，构建出刚性难溶Agar分子链和柔性易溶PSS分子链互穿及共价键、离子键协同能量耗散结构，开发出新型NH2-Agar/PSS双网络凝胶吸附材料。相比传统吸附剂，该双网络凝胶具有优良的稳定性，较快内扩散及吸附位点充分暴露等特征，以实现吸附剂有效利用再生、Cd(II)高效去除和资源化回收等目标。本项目还将深入研究Cd(II)在凝胶内部的扩散迁移及吸附行为机制，系统阐述双网络凝胶吸附剂与吸附性能之间的构效关系，并通过动态吸附-脱附工艺评价双网络凝胶的再生和Cd(II)的资源化回收能力。项目研究成果可望为双网络凝胶对Cd(II)的吸附行为、构建规模化处理技术工艺，提供一定的理论依据和技术支持。

Heavy metal pollution caused by the indiscriminate disposal of toxic heavy metal wastewater has become one of the serious water environmental issues. This project examines the problems of the industrial effluent purification and resource recovery in China. In this research a new type of NH2-Agar/PSS double-network hydrogel sorbent will be developed by designing two independent networks of Agar and PSS, which aim at fulfilling the efficient removal and resource recovery of heavy metal ions and the fast separation and regeneration of sorbents. Simultaneously, the structure of energy dissipation attribute will be designed to examine the synergy of two mechanisms: crack bridging by the network of covalent crosslinks, and hysteresis by unzipping the network of ionic cross-links. Subtly taking control of interface structure and macroscopic morphology, endowing multifunctional features for the good mechanical properties and swelling property, effectively strengthen intraparticle diffusion and all adsorption sites can be fully exposed. Furthermore, the diffusion process, adsorption behavior and the structure-activity relationship between the DN hydrogel and adsorption performance will be in-depth studied. The regeneration of sorbents and recycling capacity of heavy metal ions will be evaluated through the large-scale adsorption and separation technology; in addition, the technical process for large-scale industrial wastewater treatment will be built. The research results will provide the studies on wastewater treatment by DN hydrogel and resource utilization with some theoretical basis and technical supports.