Crosslinked chitosan/poly(vinyl alcohol) nanofibers functionalized by ionic liquid for heavy metal ions removal
Crosslinked chitosan/poly(vinyl alcohol) nanofibers functionalized by ionic liquid for heavy metal ions removal
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DOI：
10.1016/j.ijbiomac.2021.12.008
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发表时间：
2021-12-11
影响因子：
8.2
通讯作者：
Wirzal，Mohd Dzul Hakim
中科院分区：
文献类型：
--
作者：
Rosli，Norhazirah;Yahya，Wan Zaireen Nisa;Wirzal，Mohd Dzul Hakim
纳米结构吸附剂即纳米纤维已被证明具有较高的吸附率和处理废水的效率。采用静电纺丝法制备了壳聚糖/聚乙烯醇（PVA）共混纳米纤维膜，并以戊二醛交联，1-烯丙基-3-甲基咪唑氯为功能化剂，作为去除重金属离子的潜在生物吸附剂。为了克服壳聚糖吸附容量低、物理性能不适合吸附的限制，首先将壳聚糖水解后用PVA静电纺丝，然后进行交联，再用离子液体进行功能化。利用场发射扫描电镜、能量色散x射线能谱（FESEM-EDX）和傅里叶变换红外光谱（FTIR）研究了壳聚糖/聚乙烯醇纳米纤维水解膜的形态和形成的化学键，结果表明水解后的壳聚糖/聚乙烯醇纳米纤维膜成功交联和功能化。在Pb（II）、Mn（II）和Cu（II）纯重金属离子溶液中对所合成的吸附剂进行了评价，对Pb（II）离子表现出最好的吸附性能。对Pb（II）离子的最高吸附量为166.34 mg/g，符合Freundlich等温线模型和拟二级动力学模型，分别描述了吸附平衡和Pb（II）的动力学速率。所合成的吸附剂对Pb（II）离子具有良好的去除能力。
Nanostructure adsorbents namely nanofibers have been demonstrated to have a high adsorption rate and are efficient to treat wastewater. Herein, chitosan/poly(vinyl alcohol) (PVA) blend nanofiber membranes prepared by electrospinning method were crosslinked using glutaraldehyde and functionalized with 1-allyl-3-methylimidazolium chloride to be used as a potential bio-sorbent for heavy metal ions removal. The chitosan was first hydrolyzed before electrospinning with PVA, followed by crosslinking and further functionalized by ionic liquid to overcome the limitation of chitosan which has low adsorption capacity and unsuitable physical properties for the adsorption process. The morphology and the chemical bond formed were investigated by using field emission scanning electron microscopy with energy dispersive x-ray spectroscopy (FESEM-EDX) and Fourier transform infrared (FTIR) showing that the hydrolyzed chitosan/PVA nanofiber membranes were successfully crosslinked and functionalized. The synthesized adsorbent was evaluated in pure heavy metal ions solutions namely Pb(II), Mn(II), and Cu(II) and shown best performance for Pb(II) ions. The highest adsorption capacity recorded for Pb(II) ions was 166.34 mg/g and are well fitted to the Freundlich isotherm model and pseudo-second-order kinetic model to describe the adsorption equilibrium and kinetic rate of the Pb(II) uptake, respectively. The synthesized adsorbent clearly shows a great capability to remove Pb(II) ions.