Hubei Key Laboratory of Biomass Fiber and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430073, China.
Hubei Key Laboratory of Biomass Fiber and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430073, China.
J Colloid Interface Sci. 2019 Mar 15;539:400-413. doi: 10.1016/j.jcis.2018.12.078. Epub 2018 Dec 21.
The development of a high-efficiency adsorption material is important for the simultaneous elimination of heavy metal ions and organic pollutants from wastewater. In the present work, a novel material was synthesized by grafting functionalized cucurbit [8] uril (CB[8]) onto chitosan (CS) chains via a CNC covalent bond (CB[8]-CS). This as-prepared material presented an unprecedented adsorption capacity. The maximum adsorption capacities (q) were 1622.7 mg/g, 1172.7 mg/g, 1361.9 mg/g and 873.6 mg/g for the adsorption of reactive orange 5 (RO5), acidic blue 25 (AB25), reactive yellow 145 (RY145) and Pb ions, respectively, which are far higher than the reported data. The simultaneous co-adsorption of dye and a heavy metal ion was tested with a mixed solution of 200 mg/L RO5 dye and Pb ion, and the removal rates were 97% and 70% for RO5 and Pb, respectively. The adsorption mechanism was explored by means of the IR spectrum and the UV-vis diffuse reflection spectrum (DRS) together with theoretical calculations. The adsorption of dyes was mainly driven by the strong interaction between dye molecules and the hydrophobic cavity of CB[8], and the Pb adsorption was mainly driven by the coordination of Pb with the carbonyl of the CB[8] port and the amino group of chitosan. The ultrahigh adsorption capacity allows the use of CB[8]-CS as potential adsorbent for the simultaneous removal of heavy metal ions and organic dyes from aqueous solution.
高效吸附材料的开发对于从废水中同时去除重金属离子和有机污染物非常重要。在本工作中，通过 CNC 共价键将功能化的葫芦[8]脲（CB[8]）接枝到壳聚糖（CS）链上合成了一种新型材料（CB[8]-CS）。所制备的材料表现出前所未有的吸附能力。对于活性艳橙 5（RO5）、酸性蓝 25（AB25）、活性黄 145（RY145）和 Pb 离子的吸附，最大吸附容量（q）分别为 1622.7、1172.7、1361.9 和 873.6 mg/g，远高于报道的数据。用 200mg/L RO5 染料和 Pb 离子的混合溶液测试了染料和重金属离子的同时共吸附，RO5 和 Pb 的去除率分别为 97%和 70%。通过红外光谱和紫外-可见漫反射光谱（DRS）结合理论计算探讨了吸附机理。染料的吸附主要是由染料分子与 CB[8]疏水腔之间的强相互作用驱动的，Pb 的吸附主要是由 Pb 与 CB[8]端口的羰基和壳聚糖的氨基之间的配位作用驱动的。超高的吸附容量使 CB[8]-CS 成为从水溶液中同时去除重金属离子和有机染料的潜在吸附剂。
