Efficient heavy metal removal from water by alginate-based porous nanocomposite hydrogels: The enhanced removal mechanism and influencing factor insight.
Efficient heavy metal removal from water by alginate-based porous nanocomposite hydrogels: The enhanced removal mechanism and influencing factor insight.
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DOI：
10.1016/j.jhazmat.2021.126358
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发表时间：
2021-06
影响因子：
13.6
通讯作者：
Wei Zhang;J. Ou;Bin Wang;Hongyu Wang;Qiulai He;Jianyang Song;Huining Zhang;Meiyi Tang;
中科院分区：
文献类型：
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作者：
Wei Zhang;J. Ou;Bin Wang;Hongyu Wang;Qiulai He;Jianyang Song;Huining Zhang;Meiyi Tang;
通过将聚苯胺-聚吡咯修饰的氧化石墨烯（GO@PAN-PPy）作为增强填料引入到海藻酸盐基质（GO@ PAN-PPy/SA）中，制备了新型多孔海藻酸盐基纳米复合水凝胶，用于去除水中的Cr（VI）和Cu（II）。将不同原位共聚功能化GO与Py-An单体的质量比（从零到1：1）和GO@PAN-PPy的含量（从零到2.0%（w/v））嵌入到海藻酸盐主链中以改善吸附性能。在批量吸附模式下研究了pH、共存金属离子和溶胀状态等关键因素。聚合物骨架和填料的协同效应可以降低pH依赖性吸附反应的影响。优化后的GO@PAN-PPy-2（1）/SA对Cr（VI）和Cu（II）的最大吸附量分别为133.7 mg/g和87.2 mg/g，吸附能力上级于普通SA和GO/SA，优于其他同类吸附剂。吸附剂具有良好的适应性0.2 M的盐去除Cr（VI），但差的Cu（II）的去除。预溶胀处理和共吸附可以提高吸附性能。水凝胶在单/二元体系中循环5次后表现出良好的可重复使用性。总的来说，这项工作表明，所得的水凝胶具有潜在的候选吸附剂，从水中去除阴离子-阳离子重金属离子。
Novel porous alginate-based nanocomposite hydrogels were prepared by incorporating polyaniline-polypyrrole modified graphene oxide (GO@PAN-PPy) as reinforcing fillers into the alginate matrix (GO@PAN-PPy/SA) for Cr(VI) and Cu(II) removal from water. Different in-situ co-polymerization functionalized GO with Py-to-An mass ratios of monomers (from nil to 1:1) and contents of GO@PAN-PPy (from nil to 2.0%(w/v)) were embedded into the alginate backbone to improve the sorption performance. Key factors, such as pH, coexisting metal ions, and swelling states were investigated in batch adsorption modes. The synergistic effect combined from polymer backbone and fillers could lower the impact of the pH-dependent adsorption reaction. With an adsorption ability superior to that of plain SA and GO/SA, the optimized GO@PAN-PPy-2(1)/SA exhibited good experimental maximum adsorption capacities for Cr(VI) (~133.7 mg/g) and Cu(II) (~87.2 mg/g) at pH 3.0, which were better than those of many other similar sorbents. The sorbents possessed excellent adaptability for 0.2 M salt for Cr(VI) removal but poor for Cu(II) removal. Pre-swelling treatment and co-adsorption could enhance the adsorption performance. The excellent reusability of hydrogel was demonstrated after five cycles in single/binary system. Overall, this work reveals that the resultant hydrogel holds potential as candidate sorbent to remove anionic-cationic heavy metal ions from water.