Charge-controllable mussel-inspired magnetic nanocomposites for selective dye adsorption and separation
Charge-controllable mussel-inspired magnetic nanocomposites for selective dye adsorption and separation
复制标题
用于选择性染料吸附和分离的电荷可控的贻贝磁性纳米复合材料
DOI：
10.1016/j.chemosphere.2022.134404
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发表时间：
2022
期刊：
影响因子：
8.8
通讯作者：
John H. Xin
中科院分区：
文献类型：
--
作者：
Yintung Lam;Suju Fan;Liang He;Yanki Ho;Bin Fei;John H. Xin
采用一种简便、可持续的合成方法制备了磁性聚多巴胺（PDA）纳米复合材料。所合成的聚合物基杂化复合材料继承了PDA的邻苯二酚和氨基部分所贡献的固有磁性以及Fe 3 O 4的磁性。由于PDA的独特性质，Fe3O4@PDA的表面电荷可以通过pH值调节，实现智能吸附-脱附行为。以结晶紫、罗丹明B、直接蓝71和橙子G等4种不同结构和表面电荷的市售染料为研究对象，考察了Fe3O4@PDA在废水处理中的吸附能力和普适性。结果表明，在适当的pH条件下，该复合材料可以成功地吸附这些阳离子和阴离子染料。这证实了纳米吸附剂去除常见纺织品染料的能力。分散的磁性纳米吸附剂也证明了从染料混合物中收集的容易性，以及将它们重复使用几个循环的可能性。通过简单的电荷控制可以实现染料的选择性分离，而不需要消耗大量的有机溶剂和能量。这些仿生纳米复合材料吸附剂在废水处理和染料废物选择性回收方面表现出了很大的潜力，特别是对于含有离子染料的废水。
Magnetic polydopamine (PDA) nanocomposites were prepared with a facile and sustainable synthetic method. The as-synthesized polymer-based hybrid composites inherited the intrinsic adhesiveness contributed by catechol and amino moieties of PDA as well as the magnetic property of Fe3O4. With the unique properties of PDA, the surface charges of Fe3O4@PDA could be easily tuned by pH for smart adsorption-desorption behaviors. Four commercially available dyestuffs including crystal violet, rhodamine B, direct blue 71 and orange G with different structures and surface charges in solution were selected to investigate the adsorption ability and universality of Fe3O4@PDA in wastewater treatment. It was found that the nanocomposites could successfully adsorb these cationic and anionic dyes under suitable pH conditions. This confirmed the ability of the nanoadsorbents for the removal of common textile dyes. The dispersed magnetic nanoadsorbents also demonstrated the ease of collection from dye mixtures, and the possibility of reusing them for several cycles. Selective dye separation was found to be achievable via simple charge control without large consumption of organic solvent and energy. These bio-inspired nanocomposite adsorbents have shown high potential in wastewater treatment and selective recovery of dye waste, especially for wastewater containing ionic dyes.