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首页> 外文期刊>RSC Advances >Fabrication of chitosan/silica nanofibrous adsorbent functionalized with amine groups for the removal of Ni(II), Cu(II) and Pb(II) from aqueous solutions: batch and column studies
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Fabrication of chitosan/silica nanofibrous adsorbent functionalized with amine groups for the removal of Ni(II), Cu(II) and Pb(II) from aqueous solutions: batch and column studies

机译：用胺基官能化的壳聚糖/二氧化硅纳米纤维吸附剂的制备，用于从水溶液中去除Ni（II），Cu（II）和Pb（II）：分批和色谱柱研究

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摘要

A chitosan/tetraethylorthosilicate/aminopropyl triethoxysilane (CS/TEOS/APTES) composite nanofibrous adsorbent was prepared via an electrospinning process. The performance of the prepared nanofibers was investigated for Ni(II), Cu(II) and Pb(II) ion sorption in single and ternary systems. The prepared nanofibers were characterized using FTIR, SEM and BET analysis. The effects of sorption parameters including pH, contact time, initial concentration and temperature were evaluated in a single system. The maximum sorption capacities for Ni(II), Cu(II) and Pb(II) ions onto the CS/TEOS/APTES nanofibrous adsorbent were found to be 696.2, 640.5 and 575.5 mg g(-1) at an equilibrium time of 30 min and at 45 degrees C. The kinetic and equilibrium data were well described using pseudo-first-order kinetic and Langmuir isotherm models. The calculated thermodynamic parameters indicated a spontaneous and endothermic adsorption process. A Box-Behnken design was used to evaluate the effects of four parameters including pH and initial concentration of Ni(II), Cu(II) and Pb(II) ions on the sorption efficiency. The selectivity order of metal ions onto the CS/TEOS/APTES nanofibers was Ni(II) > Cu(II) > Pb(II) in a ternary system. In fixed bed column studies, the Ni(II), Cu(II) and Pb(II) sorption capacities were increased by increasing the flow rate up to 4 mL min(-1). A Thomas model predicted well the adsorption capacity of metal ions in a fixed bed column. The removal efficiency of metal ions by the regenerated nanofibers did not significantly change in both batch and fixed-bed column studies.
机译：通过静电纺丝工艺制备了壳聚糖/原硅酸四乙酯/氨丙基三乙氧基硅烷（CS / TEOS / APTES）复合纳米纤维吸附剂。研究了制备的纳米纤维在单体系和三体系中对Ni（II），Cu（II）和Pb（II）离子吸附的性能。使用FTIR，SEM和BET分析对制备的纳米纤维进行表征。在一个系统中评估了吸附参数的影响，包括pH，接触时间，初始浓度和温度。在平衡时间为30时，CS / TEOS / APTES纳米纤维吸附剂对Ni（II），Cu（II）和Pb（II）离子的最大吸附能力为696.2、640.5和575.5 mg g（-1）。最小和在45摄氏度。使用伪一级动力学和Langmuir等温模型很好地描述了动力学和平衡数据。计算的热力学参数表明自发的和吸热的吸附过程。 Box-Behnken设计用于评估四个参数（包括pH和Ni（II），Cu（II）和Pb（II）离子的初始浓度）对吸附效率的影响。在三元体系中，金属离子在CS / TEOS / APTES纳米纤维上的选择性顺序为Ni（II）> Cu（II）> Pb（II）。在固定床色谱柱研究中，通过将流速提高到4 mL min（-1），可以提高Ni（II），Cu（II）和Pb（II）的吸附能力。 Thomas模型很好地预测了固定床色谱柱中金属离子的吸附能力。在分批和固定床色谱柱研究中，再生的纳米纤维对金属离子的去除效率均没有显着变化。

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