College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, PR China.
College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, PR China; National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, PR China.
J Hazard Mater. 2021 Mar 5;405:124194. doi: 10.1016/j.jhazmat.2020.124194. Epub 2020 Oct 8.
A novel CO-responsive cellulose nanofibril aerogel as a "green" adsorbent derived from poly(methacrylic acid-co-2-(dimethylamino) ethyl methacrylate) and carboxylated cellulose nanofibrils was successfully prepared via stepwise cation-induced gelation and freeze drying method. This aerogel exhibited CO-triggered adsorption behavior towards anionic dyes with a rapid adsorption rate and a high adsorption capacity, as well as satisfactory mechanical properties. Upon CO stimulation, the charged aerogel can selectively adsorb anionic dyes from aqueous solutions based on an electrostatic interaction. The maximum adsorption capacities of this aerogel towards methyl blue (MB), naphthol green B (NGB), and methyl orange (MO) were 598.8, 621.1 and 892.9 mg g, respectively, accompanied by fast adsorption equilibriums towards MB and NGB within 7 min, and MO within 12 min. Meanwhile, the adsorption isotherms and the kinetics of the CO-responsive adsorbents followed the Freundlich isotherm and the pseudo-second-order model, respectively. Furthermore, the resulting CO-responsive adsorbent exhibited outstanding recyclability, as its adsorption performance can still be maintained even after twenty cycles. Accordingly, the resultant CO-responsive cellulose nanofibril aerogel could be a promising adsorbent material for the removal of anionic dyes in wastewater remediation.
一种新型 CO 响应纤维素纳米纤维气凝胶作为一种“绿色”吸附剂，由聚（甲基丙烯酸-co-2-（二甲氨基）乙基甲基丙烯酸酯）和羧基化纤维素纳米纤维通过分步阳离子诱导凝胶化和冷冻干燥方法制备。该气凝胶对阴离子染料表现出 CO 触发的吸附行为，具有快速吸附速率和高吸附容量以及令人满意的机械性能。在 CO 刺激下，带电荷的气凝胶可以基于静电相互作用从水溶液中选择性地吸附阴离子染料。该气凝胶对亚甲基蓝（MB）、萘酚绿 B（NGB）和甲基橙（MO）的最大吸附容量分别为 598.8、621.1 和 892.9 mg g，MB 和 NGB 的吸附平衡在 7 min 内达到，MO 在 12 min 内达到。同时，CO 响应吸附剂的吸附等温线和动力学遵循 Freundlich 等温线和拟二级动力学模型。此外，所得的 CO 响应吸附剂表现出出色的可回收性，即使经过二十次循环，其吸附性能仍能保持。因此，所得的 CO 响应纤维素纳米纤维气凝胶可以成为废水处理中去除阴离子染料的有前途的吸附材料。
