Mechanically stable core-shell cellulose nanofibril/sodium alginate hydrogel beads with superior cu(II) removal capacity.
Mechanically stable core-shell cellulose nanofibril/sodium alginate hydrogel beads with superior cu(II) removal capacity.
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DOI：
10.1016/j.ijbiomac.2022.09.167
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发表时间：
2022-09
影响因子：
8.2
通讯作者：
Kaihuang Chen;Famei Qin;Zhiqiang Fang;Guanhui Li;Jie Zhou;X. Qiu
中科院分区：
文献类型：
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作者：
Kaihuang Chen;Famei Qin;Zhiqiang Fang;Guanhui Li;Jie Zhou;X. Qiu
纳米纤维素水凝胶是有前景的可持续生物吸附剂，可去除废水处理中的重金属离子。然而，迄今为止报道的纳米纤维素水凝胶通常具有较差的吸附性能和/或较差的机械稳定性，从而限制了它们的工业应用。实现机械稳定性和高去除能力的目标仍然是一个关键的技术挑战，正如本研究中提出的，可以通过开发新型核壳羧甲基化纤维素纳米纤维（CMCNF）/海藻酸钠（SA）水凝胶珠（CAb）来解决这一问题。通过静电引力和氢键将 CMCNF（壳）固定在 SA 水凝胶珠（核）表面，构建了具有核壳结构的机械稳定水凝胶珠，其 Cu(II) 去除能力高达 221 mg/g，超过了 CMCNF 和大多数其他纳米纤维素结构吸附剂。此外，还详细探讨了核壳结构的形成原理和Cu(II)的去除机制。最后，我们展示了核壳 CAb 使用自制柱吸附装置处理低浓度 Cu(II) 饮用水的潜在应用。这项工作使可持续纳米纤维素吸附剂距离铜（II）废水处理的工业应用又近了一步。
Nanocellulose hydrogels are promising sustainable biosorbents for removing heavy metal ions for wastewater treatment. However, the nanocellulose hydrogels reported thus far typically suffer from inferior adsorption performance and/or poor mechanical stability, thus limiting their industrial applications. Achieving the goals of mechanical stability and high removal capability remains a crucial technical challenge, which may be addressed, as presented in this study, by developing novel core-shell carboxymethylated cellulose nanofibril (CMCNF)/sodium alginate (SA) hydrogel beads (CAbs). By immobilizing CMCNFs (shell) on the surface of the SA hydrogel bead (core)viaelectrostatic attractions and hydrogen bonding, a mechanically stable hydrogel bead with a core-shell configuration was constructed, which shows a Cu(II) removal capacity of up to 221 mg/g that exceeds that of CMCNFs and most other nanocellulose structural adsorbents. Furthermore, both the formation principle of the core-shell structure and the Cu(II) removal mechanism were explored in detail. Finally, we demonstrated a potential application of core-shell CAbs to treat drinking water with a low concentration of Cu(II) using a homemade column adsorption device. This work brings sustainable nanocellulose adsorbents a step closer to industrial applications for Cu(II) wastewater treatment.