A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions.
A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions.
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一种绿色L-半胱氨酸改性纤维素纳米晶体生物吸附剂，用于吸附水溶液中的汞离子
作者：
利用绿色生物吸附剂去除水溶液中的有毒汞离子是一项重要的工作。通过高碘酸氧化和还原胺化反应，将高比表面积纤维素纳米晶与L-半胱氨酸功能化，制备了一种新型生物吸附剂L-半胱氨酸修饰纤维素纳米晶（Lcys-CNCs）。采用FT-IR、13 C CP-MAS NMR、元素分析、XPS、zeta电位和SEM等手段对Lcys-CNCs进行了表征。由于纤维素纳米晶体是天然的纳米材料，L-半胱氨酸含有强的汞螯合基团，Lcys-CNCs对汞离子表现出优异的吸附能力。实验条件，如pH值，接触时间，和初始汞离子浓度进行了讨论。准二级动力学模型比准一级动力学模型能更准确地描述Hg（ii）的去除动力学。Hg（ii）的吸附等温线符合Langmuir单分子层吸附模型。Lcys-CNCs的最大吸收能力被确定为923 mg g−1。Lcys-CNC可以在5分钟内从71 mg L−1溶液中去除93%的汞离子。对于Cd（ii）、Pb（ii）、Cu（ii）和Zn（ii）离子，Lcsy-CNCs对Hg（ii）离子具有选择性吸附作用，去除率为87.4%。本研究表明Lcsy-CNCs是一种绿色高效的生物吸附剂。合成了一种绿色生物吸附剂--l-半胱氨酸修饰的纤维素纳米晶，并将其应用于水溶液中汞离子的吸附。
Using a green biosorbent to remove toxic mercury ions from aqueous solutions is a significant undertaking. In the present study, a novel biosorbent, l-cysteine modified cellulose nanocrystals (Lcys-CNCs), was prepared by functionalizing high surface area cellulose nanocrystals with l-cysteine through periodate oxidation and reductive amination reaction. Lcys-CNCs were characterized by FT-IR, 13C CP-MAS NMR, elemental analysis, XPS, zeta potential and SEM. As cellulose nanocrystals are the natural nanomaterial, and l-cysteine contains strong mercury chelating groups, Lcys-CNCs show excellent adsorption capacity for mercury ions. The experimental conditions such as pH, contact time, and initial mercury ion concentration are discussed. The pseudo-second order model can describe the removal kinetics of Hg(ii) more accurately than the pseudo-first order model. The adsorption isotherm study of Hg(ii) followed the Langmuir model of monolayer adsorption. The maximum uptake capacity of Lcys-CNCs was determined to be 923 mg g−1. Lcys-CNCs can remove mercury ions with 93% removal efficiency within 5 min from a 71 mg L−1 solution. For Cd(ii), Pb(ii), Cu(ii) and Zn(ii) ions, Lcsy-CNCs can selectively adsorb Hg(ii) ions and the removal efficiency is 87.4% for Hg(ii). This study suggests Lcsy-CNCs are a green and highly efficient biosorbent for adsorption of mercury ions from aqueous solutions. A green biosorbent, l-cysteine modified cellulose nanocrystals, was successfully synthesized and applied to adsorb mercury ions from aqueous solutions.
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