3D multi-wall perforated nanocellulose-based polyethylenimine aerogels for ultrahigh efficient and reversible removal of Cu(II) ions from water
3D multi-wall perforated nanocellulose-based polyethylenimine aerogels for ultrahigh efficient and reversible removal of Cu(II) ions from water
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3D 多壁穿孔纳米纤维素基聚乙烯亚胺气凝胶，用于超高效、可逆地去除水中的 Cu(II) 离子
DOI：
10.1016/j.cej.2019.122157
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发表时间：
2019-12-15
影响因子：
15.1
通讯作者：
Li, Jianzhang
中科院分区：
文献类型：
--
作者：
Mo, Liuting;Pang, Huiwen;Li, Jianzhang
利用易于回收的生物吸附材料去除水环境中的重金属离子是消除全球水污染的重要一步。在这项研究中，一种新型的氨基功能化的纳米纤维素气凝胶吸附剂，用于有效和可逆的循环捕获铜（II）离子通过自组装的2，2，6，6-四甲基哌啶-1-氧基（克里思）氧化纤维素纳米纤维（TO-CNF）交联三羟甲基丙烷-三-（2-甲基-1-氮丙啶）丙酸酯（TMPTAP）和聚乙烯亚胺（PEI）。TO-CNF与TMPTAP在室温下于水溶液中通过开环反应自发反应，然后与PEI交联。所得TO-CNF/TMPTAP/PEI气凝胶具有三维多孔结构，含有丰富的氨基和含氧基团。TO-CNF/TMPTAP/PEI气凝胶的独特结构允许通过Langmuir等温模型计算的485.44 mg/g的Cu（II）离子吸附容量，这几乎是已知的可生物降解的基于纤维素的吸附剂中的最高值。TO-CNF/TMPTAP/PEI气凝胶经EDTA-2Na处理再生后，可恢复其原有的结构，并可循环使用4次以上，吸附性能无明显下降。该复合气凝胶具有良好的吸附能力、良好的可回收性和可逆性、优异的化学和结构稳定性以及易于分离性，使其成为在实际废水处理应用中吸附Cu（II）离子的理想材料。
The utilization of easily recyclable biosorbent material with ultrahigh adsorption capacity for the removal of heavy metal ions from aqueous environments is an important step towards eradicating water pollution worldwide. In this study, a novel amino-functionalized nanocellulose aerogel adsorbent for efficient and reversible recycle capture of Cu(II) ions was fabricated via self-assembly of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose nanofibril (TO-CNF) crosslinked Trimethylolpropane-tris-(2-methyl-1-aziridine) propionate (TMPTAP) and polyethyleneimine (PEI). The TO-CNF was spontaneously reacted with TMPTAP via a ring-opening reaction in an aqueous solution at room temperature and then cross-linked with PEI. The resultant TO-CNF/TMPTAP/PEI aerogel showed a 3D multi-wall perforated cellular structure with plentiful amino groups and oxygen-containing groups. The unique architecture of the TO-CNF/TMPTAP/PEI aerogel allowed an ultrahigh Cu(II) ion adsorption capacity of 485.44 mg/g as-calculated by the Langmuir isotherm model, which is almost the highest value among known biodegradable cellulose-based adsorbents. The TO-CNF/TMPTAP/PEI aerogels also can restore their original architecture after regeneration by EDTA-2Na treatment and be utilized more than four cycles without significant degradation of adsorption performance. The ultrahigh adsorption capacity, good recyclability and reversibility, excellent chemical and structural stability, and ease of separation make these composite aerogels ideal materials for the adsorption of Cu(II) ions in practical wastewater treatment applications.