Zhu Lingkai, Yao Yuyuan, Chen Dingzhou, Lan Ping
College of Materials and Textile Engineering, Jiaxing University Jiaxing 314001 China
School of Materials Science and Engineering, Zhejiang Sci-Tech University Hangzhou 310018 China.
RSC Adv. 2022 Jul 11;12(31):20062-20073. doi: 10.1039/d2ra01521h. eCollection 2022 Jul 6.
Herein, we developed a low-cost fabrication route to prepare chemically grafted activated carbon fibers, which effectively removed Pb from solution. Multiple characteristic results indicated that l-cyst-ACF had abundant nitrogen-containing and sulfur-containing functional groups. Based on the XPS and EDS analyses, the capture of Pb was attributed to the abundant adsorption sites on the fiber surface. According to the analysis of the pseudo-second-order kinetic model and the Langmuir isotherm model, the adsorption process could be interpreted as monolayer adsorption and chemisorption, and the equilibrium adsorption capacity was determined to be 136.80 mg g by fitting the pseudo-second-order kinetic model. The maximum adsorption capacity of l-cyst-ACF for Pb was calculated to be 179.53 mg g using the Langmuir model. In addition, the adsorption reaction was endothermic and spontaneous, as evidenced by the thermodynamic parameters. The outcomes of this study provide a low-cost and feasible strategy for the remediation of Pb pollution in the environment.
在此，我们开发了一种低成本的制备路线来制备化学接枝的活性炭纤维，其能有效去除溶液中的铅。多项表征结果表明，L-半胱氨酸改性活性炭纤维（l-cyst-ACF）具有丰富的含氮和含硫官能团。基于X射线光电子能谱（XPS）和能谱分析（EDS），铅的捕获归因于纤维表面丰富的吸附位点。根据准二级动力学模型和朗缪尔等温线模型的分析，吸附过程可解释为单层吸附和化学吸附，通过拟合准二级动力学模型确定平衡吸附容量为136.80 mg/g。使用朗缪尔模型计算得出l-cyst-ACF对铅的最大吸附容量为179.53 mg/g。此外，热力学参数表明吸附反应是吸热且自发的。本研究结果为环境中铅污染的修复提供了一种低成本且可行策略。
