利用壳聚糖磁性氧化石墨烯纳米复合材料吸附砷。
Adsorption of arsenic using chitosan magnetic graphene oxide nanocomposite.
机构信息
Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia; Department of Chemical Engineering, College of Engineering Technology-Janzour, Libya.
Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia.
出版信息
J Environ Manage. 2019 Sep 15;246:547-556. doi: 10.1016/j.jenvman.2019.05.117. Epub 2019 Jun 12.
Chitosan-magnetic-graphene oxide (CMGO) nanocomposite was prepared for arsenic adsorption. The nanocomposite was characterized through BET, FTIR, FESEM, EDX, and VSM analyses. These characterizations confirmed the formation of CMGO nanocomposites with high specific surface area (152.38 m/g) and excellent saturation magnetization (49.30 emu/g). Batch adsorption experiments were conducted to evaluate the performance of the nanocomposite in the adsorption of arsenic from aqueous solution. The effects of operational parameters, adsorption kinetic, equilibrium isotherm and thermodynamics were evaluated. The removal efficiency of arsenic increased with increasing adsorbent dosage and contact time. However, the effect of pH followed a different pattern, with the removal efficiency increasing from acidic to neutral pH, and then decreasing at alkaline conditions. The highest adsorption capacity (45 mg/g) and removal efficiency (61%) were obtained at pH 7.3. The adsorption kinetic followed a pseudo-second-order kinetic model. The analysis of adsorption isotherm shows that the adsorption data fitted well to Langmuir isotherm model, indicating a homogeneous process. Thermodynamic analysis shows that the adsorption of As(III) is exothermic and spontaneous. The superparamagnetic properties of the nanocomposite enabled the separation and recovery of the nanoparticles using an external magnetic field. Thus, the developed nanocomposite has a potential for arsenic remediation.
壳聚糖-磁性氧化石墨烯（CMGO）纳米复合材料被制备用于砷吸附。通过 BET、FTIR、FESEM、EDX 和 VSM 分析对纳米复合材料进行了表征。这些表征证实了 CMGO 纳米复合材料的形成，其具有高比表面积（152.38 m²/g）和优异的饱和磁化强度（49.30 emu/g）。进行了批量吸附实验以评估纳米复合材料在从水溶液中吸附砷方面的性能。评估了操作参数、吸附动力学、平衡等温线和热力学的影响。砷的去除效率随着吸附剂剂量和接触时间的增加而增加。然而，pH 的影响遵循不同的模式，去除效率从酸性到中性 pH 增加，然后在碱性条件下降低。在 pH 7.3 时，获得了最高的吸附容量（45 mg/g）和去除效率（61%）。吸附动力学遵循准二级动力学模型。吸附等温线的分析表明，吸附数据很好地符合 Langmuir 等温线模型，表明这是一个均匀的过程。热力学分析表明，As(III)的吸附是放热和自发的。纳米复合材料的超顺磁性使得可以使用外部磁场分离和回收纳米颗粒。因此，开发的纳米复合材料在砷修复方面具有潜力。
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