Chemical Engineering Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia.
Chemical Engineering Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia; Centre of Research in Ionic Liquid (CORIL), Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia.
Int J Biol Macromol. 2022 Jan 15;195:132-141. doi: 10.1016/j.ijbiomac.2021.12.008. Epub 2021 Dec 10.
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.
纳米结构吸附剂，即纳米纤维，已被证明具有高吸附速率，可有效处理废水。在此，通过静电纺丝法制备了壳聚糖/聚乙烯醇（PVA）共混纳米纤维膜，并用戊二醛进行交联，并进一步用 1-烯丙基-3-甲基氯化咪唑进行功能化，用作去除重金属离子的潜在生物吸附剂。在与 PVA 静电纺丝之前，壳聚糖首先进行水解，然后进行交联和离子液体功能化，以克服壳聚糖吸附容量低和吸附过程物理性质不合适的限制。用场发射扫描电子显微镜和能量色散 X 射线光谱（FESEM-EDX）以及傅里叶变换红外（FTIR）研究形貌和形成的化学键，表明水解的壳聚糖/PVA 纳米纤维膜成功交联和功能化。在纯重金属离子溶液中，即 Pb(II)、Mn(II)和 Cu(II)，对合成的吸附剂进行了评价，对 Pb(II)离子表现出最佳性能。Pb(II)离子的最高吸附容量为 166.34 mg/g，并且很好地符合 Freundlich 等温线模型和拟二级动力学模型，分别描述了 Pb(II)吸收的吸附平衡和动力学速率。合成的吸附剂明显显示出去除 Pb(II)离子的巨大能力。
