School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Qinggong Street No. 1, Dalian, 116034, China.
School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Qinggong Street No. 1, Dalian, 116034, China.
Carbohydr Polym. 2021 Mar 15;256:117564. doi: 10.1016/j.carbpol.2020.117564. Epub 2020 Dec 28.
Superior mechanical properties, high adsorption capacity, and excellent regeneration property are crucial design criterions to develop a new-type aerogel for adsorptive applications towards heavy metal removal from water. Herein, chitosan and melamine not only introduced abundant functional groups to increase adsorbing sites for lead ions, but also reinforced the three-dimensional network skeleton structure of absorbents to improve the service life in adsorption applications. As-fabricated alginate/melamine/chitosan aerogel can extract Pb (II) from aqueous solution efficiently, i.e., the optimum adsorption quantity of 1331.6 mg/g at pH 5.5, which exhibited excellent and selective adsorption capacity for Pb (II) against the competition of coexisting divalent metal ions. More importantly, alginate/melamine/chitosan aerogel could be regenerated using dilute acidic solution and recovered well after eight adsorption-desorption cycles. This work might offer a new idea for design and preparation of biomass-based aerogel sorbents with promising prospect in the remediation of Pb (II)-contaminated wastewater.
开发用于从水中去除重金属的新型气凝胶，其关键设计标准是具有优越的机械性能、高吸附能力和出色的再生性能。壳聚糖和三聚氰胺不仅引入了丰富的官能团，增加了铅离子的吸附位点，而且增强了吸附剂的三维网络骨架结构，提高了在吸附应用中的使用寿命。制备的海藻酸盐/三聚氰胺/壳聚糖气凝胶可以从水溶液中有效提取 Pb(II)，即在 pH 5.5 时的最佳吸附量为 1331.6mg/g，对 Pb(II)具有优异和选择性的吸附能力，可抵抗共存的二价金属离子的竞争。更重要的是，海藻酸盐/三聚氰胺/壳聚糖气凝胶可以使用稀酸溶液进行再生，并在经过八次吸附-解吸循环后得到很好的回收。这项工作为设计和制备基于生物质的气凝胶吸附剂提供了一个新的思路，在修复 Pb(II)污染废水中具有广阔的前景。
