Preparation of cysteamine-modified cellulose nanocrystal adsorbent for removal of mercury ions from aqueous solutions
Preparation of cysteamine-modified cellulose nanocrystal adsorbent for removal of mercury ions from aqueous solutions
复制标题
半胱胺改性纤维素纳米晶吸附剂的制备用于去除水溶液中的汞离子
DOI：
10.1007/s10570-019-02420-1
复制
发表时间：
2019-05-01
期刊：
影响因子：
5.7
通讯作者：
Zhang, Shufen
中科院分区：
文献类型：
--
作者：
Li, Weixue;Ju, Benzhi;Zhang, Shufen
摘要根据可持续发展的理念，开发一种选择性高效去除汞离子的生物吸附剂具有重要意义。通过对纤维素纳米晶体进行轻度高碘酸盐氧化，接枝半胱胺，合成了一种新型的半胱胺改性纤维素纳米晶体（Cys-CNCs），并最终用于吸附水溶液中的汞离子。基于硬-软酸碱理论，将半胱胺接枝到纤维素纳米晶上，以提高其对汞离子的吸附能力。考察了pH、接触时间和汞离子初始浓度对吸附过程的影响。拟二级模型能较准确地描述吸附动力学。Hg（II）的吸附等温线研究遵循Langmuir单层吸附模型，最大吸附量为849 mg g−1。cys - cnc4.05可以在51 mg L−1溶液中快速去除汞离子，10分钟内去除率达99%。此外，cys - cnc4.05经过4次吸附/脱附循环后表现出良好的再生性能。图形抽象
AbstractAccording to the concept of sustainable development, it is important to develop a biosorbent for the selective and efficient removal mercury ions. A novel biosorbent, cysteamine-modified cellulose nanocrystals (Cys-CNCs), was synthesized by a mild periodate oxidation of cellulose nanocrystals, followed by grafting with cysteamine and ultimately used for adsorption of mercury ions from aqueous solutions. Cysteamine was grafted onto cellulose nanocrystals to improve its adsorption of mercury ions, based on the Hard–Soft Acid–Base theory. The effect of pH, contact time, and mercury ions initial concentration was thoroughly investigated to optimize the adsorption process. The pseudo-second order model could accurately describe the adsorption kinetics. The adsorption isotherm study of Hg(II) followed the Langmuir model of monolayer adsorption and the maximum adsorption capacity was 849 mg g−1. Cys-CNC4.05can rapidly remove mercury ions with 99% removal within 10 min from a 51 mg L−1solution. Furthermore, Cys-CNC4.05showed a good regeneration performance after four adsorption/desorption cycles.Graphical abstract