“可再生”聚羧酸盐凝胶-碱复合净水材料的原位合成及应用

为高效、经济及绿色地净化含铜废水，基于新的原位合成方法，制备新型聚羧酸盐凝胶-碱复合净水材料，用于对含铜废水的高效“可再生”净化. 以一种活性杂环型阳离子单体(N,N-二烯丙基-3-羟基杂氮环丁烷氯化铵，DHAC)和丙烯酸(AA)为基本原料，通过“预聚+交联”的新型反应过程，构建开环交联型聚羧酸盐凝胶骨架(ROPCG)，并产生原位包覆效应，实现对溶液体系中NaOH的100%包覆，获得高效的ROPCG-NaOH复合净水材料. 结果表明:①基于“吸附+沉淀”协同的双重作用机制，ROPCG-NaOH材料实现了对含铜废水的高效净化，每g ROPCG-NaOH复合净水材料可去除384.62 mg的铜离子，同等净水能力优于大部分同类产品. ②ROPCG-NaOH复合净水材料仅通过简单的“预聚+交联”反应过程即可获得，且主要的生产原料为商业易得的常规原料，具有简单易得、绿色环保的特性，综合考虑ROPCG-NaOH复合净水材料具有明显的应用优势. ③ROPCG-NaOH材料废渣可再生为有用的ROPCG凝胶吸附剂，再生ROPCG凝胶吸附剂的铜吸附容量为276.24 mg/g，与单纯ROPCG凝胶吸附剂的铜吸附容量(286.53 mg/g)接近，重复再生率为96.55%. 研究显示，ROPCG-NaOH复合净水材料能高效、经济、绿色及“可再生性”地处理水中铜离子，应用前景良好. 

In-situ Synthesis and Application of Novel Renewable Polycarboxylate Gel-Alkali Composite Water-Purification Material

Aiming at effective, economical and environmentally friendly purification of copper-containing wastewater, based on new in-situ synthesis method, a polycarboxylate gel-alkali composite water-purification material is prepared for the ‘renewable’ treatment of copper-containing wastewater. A ring-opening cross-linking polycarboxylate gel skeleton (ROPCG) is established through a new reaction process of ‘pre-polymerization and crosslinking’ using a reactive heterocyclic cationic monomer (DHAC) and acrylic acid (AA) as the basic raw materials. At the same time, an in-situ coating effect is created for 100% coating of NaOH in the solution system and an efficient ROPCG-NaOH composite water purification material is obtained. The results show that for copper-containing wastewater treatment, the unit mass of ROPCG-NaOH composite water purification material can eliminate divalent copper ions with a mass of 384.62 mg/g, with a better water purification effect than that of the initial products. In addition, the waste residue of ROPCG-NaOH composite water purification material can be regenerated into ROPCG adsorbent. The copper adsorption capacity of the regenerated ROPCG adsorbent is 276.24 mg/g, which is similar to that of the initial ROPCG skeleton (286.53 mg/g), and the repeated regeneration rate is 99.47%. In conclusion, ROPCG-NaOH composite water purification material will provide an efficient, economic, green and ‘renewable’ treatment of copper ions in wastewater, and can be applied in practice in the future.