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Eco-friendly floatable foam hydrogel for the adsorption of heavy metal ions and use of the generated waste for the catalytic reduction of organic dyes.
Soft Matter ( IF 2.9 ) Pub Date : 2020-06-27 , DOI: 10.1039/d0sm00756k Hui Zhao 1 , Ying Li 1
Soft Matter ( IF 2.9 ) Pub Date : 2020-06-27 , DOI: 10.1039/d0sm00756k Hui Zhao 1 , Ying Li 1
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Benefiting from their three-dimensional network structure and various functional groups, hydrogels have emerged as efficient adsorbents for the removal of heavy metal ions from wastewater. However, the obvious drawbacks of hydrogels such as generation of toxic secondary waste after adsorption and difficulty in their separation and collection limit their practical application in wastewater treatment. Herein, we introduced a facile strategy of combining mechanical frothing and in situ radical polymerization to prepare a floatable porous foam hydrogel, which not only efficiently removed Cu2+ from water, but also could be easily collected. After adsorption, to avoid the generation of secondary toxic waste, a sustainable strategy of turning the waste into useful materials was introduced. The waste of the Cu2+_ adsorbed hydrogel was processed using NaBH4 solution to obtain a Cu nanoparticle (Cu NP)-loaded composite hydrogel, which was further employed as a catalyst for the catalytic reduction of organic dyes. Thus, this work established a convenient and sustainable strategy for the preparation of an eco-friendly floatable foam hydrogel for the efficient removal of heavy metal ions such as Cu2+ from water and turning the generated waste into useful materials, which is a concept envisaged to be applicable to other heavy metal ion-adsorbed hydrogel systems and will efficiently avoid unwanted secondary pollution.
中文翻译：
环保的可漂浮泡沫水凝胶，用于吸附重金属离子，并将产生的废物用于催化还原有机染料。
得益于其三维网络结构和各种官能团，水凝胶已成为从废水中去除重金属离子的有效吸附剂。然而，水凝胶的明显缺点，例如吸附后产生有毒的二次废物，以及难以分离和收集，限制了它们在废水处理中的实际应用。在此，我们介绍了一种结合机械发泡和原位自由基聚合以制备可漂浮的多孔泡沫水凝胶的简便策略，该凝胶不仅可以有效去除Cu 2+从水中，也很容易收集。吸附后，为避免产生二次有毒废物，提出了将废物转化为有用材料的可持续策略。使用NaBH 4溶液处理吸附有Cu 2 + _的水凝胶的废料，以获得负载有Cu纳米粒子（Cu NP）的复合水凝胶，该水凝胶进一步用作催化还原有机染料的催化剂。因此，这项工作为制备可有效去除重金属离子（例如Cu 2+ 从水中将产生的废物转化为有用的材料，这是一个设想可应用于其他重金属离子吸附的水凝胶体系的概念，将有效避免不必要的二次污染。
更新日期：2020-07-29
中文翻译：
环保的可漂浮泡沫水凝胶，用于吸附重金属离子，并将产生的废物用于催化还原有机染料。
得益于其三维网络结构和各种官能团，水凝胶已成为从废水中去除重金属离子的有效吸附剂。然而，水凝胶的明显缺点，例如吸附后产生有毒的二次废物，以及难以分离和收集，限制了它们在废水处理中的实际应用。在此，我们介绍了一种结合机械发泡和原位自由基聚合以制备可漂浮的多孔泡沫水凝胶的简便策略，该凝胶不仅可以有效去除Cu 2+从水中，也很容易收集。吸附后，为避免产生二次有毒废物，提出了将废物转化为有用材料的可持续策略。使用NaBH 4溶液处理吸附有Cu 2 + _的水凝胶的废料，以获得负载有Cu纳米粒子（Cu NP）的复合水凝胶，该水凝胶进一步用作催化还原有机染料的催化剂。因此，这项工作为制备可有效去除重金属离子（例如Cu 2+ 从水中将产生的废物转化为有用的材料，这是一个设想可应用于其他重金属离子吸附的水凝胶体系的概念，将有效避免不必要的二次污染。
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