<br>Fe3O4-壳聚糖纳米复合材料作为磁性生物吸附剂去除污水中的镍和钴重金属,International Journal of Biological Macromolecules

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Fe3O4-壳聚糖纳米复合材料作为磁性生物吸附剂去除污水中的镍和钴重金属
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2023-07-27 , DOI: 10.1016/j.ijbiomac.2023.125984
Mohammad Javad Sharifi ₁ , Amideddin Nouralishahi ₂ , Ahmad Hallajisani ₁

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最近，壳聚糖等天然聚合物作为有前途的水处理吸附剂而受到关注。通过将壳聚糖与磁性纳米粒子结合，可以增强它们的吸附能力。本研究通过共沉淀法合成了壳聚糖-磁铁矿纳米复合材料（CMNC），用于去除水溶液中的镍和钴。通过多种技术研究了合成的 CMNC 的物理化学性质，包括 FESEM、TEM、XPS、FTIR、XRD 和 VSM。电子显微镜结果证实了磁铁矿纳米颗粒在 CMNC 纳米复合材料中的均匀分散，而 VSM 证实了它们显着的磁性。吸附实验表明，在最佳条件下（pH = 6，接触时间= 2 h，吸附剂用量= 2 g/l），CMNC对Ni2+具有30.03 mg/g的高吸附容量，对Co2+具有53.19 mg/g的高吸附容量。此外，吸附数据与 Langmuir 等温线最吻合，表明 CMNC 上的活性位点在能量上是均匀的。根据动力学分析，实验数据与准二级扩散模型和颗粒内扩散模型非常一致，这表明化学吸附以及传质步骤影响整个吸附过程。最后，研究热力学参数（ΔGads、ΔHads、ΔSads）表明，CMNC 上的吸附过程是吸热且自发的，与 Ni2+ 相比，CMNC 和 Co2+ 之间观察到更强的相互作用。

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Fe3O4-chitosan nanocomposite as a magnetic biosorbent for removal of nickel and cobalt heavy metals from polluted water

Recently, natural polymers like chitosan have gained attention as promising adsorbents for water treatment. By combining chitosan with magnetic nanoparticles, their adsorption capabilities can be enhanced. In this study, chitosan-magnetite nanocomposite (CMNC) was synthesized via coprecipitation method to remove nickel and cobalt from aqueous solutions. The physicochemical properties of the synthesized CMNC were investigated by various techniques, including FESEM, TEM, XPS, FTIR, XRD, and VSM. The electron microscopy results confirmed the uniform dispersion of magnetite nanoparticles within CMNC nanocomposites, while VSM confirmed their significant magnetic properties. The adsorption experiments showed that at optimal conditions (pH = 6, contact time = 2 h, adsorbent dosage = 2 g/l), CMNC has high adsorption capacities of 30.03 mg/g for Ni2+ and 53.19 mg/g for Co2+. Furthermore, the adsorption data fitted best with the Langmuir isotherm, show that the active sites on CMNC are energetically homogenous. According to kinetic analysis, the experimental data were in good agreement with both pseudo-second-order and intra-particle diffusion models, which suggest that chemical sorption, along with mass transfer steps, influence the overall adsorption process. Finally, investigating the thermodynamic parameters (∆Gads, ∆Hads, ∆Sads) showed that the adsorption process on CMNC was endothermic and spontaneous, with stronger interactions observed between CMNC and Co2+ compared to Ni2+.

更新日期：2023-07-27

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