磁性海藻酸钠/氧化多壁碳纳米管复合材料对阳离子染料吸附的动力学、热力学、平衡等温线和可重复使用性研究。
Kinetics, thermodynamics, equilibrium isotherms, and reusability studies of cationic dye adsorption by magnetic alginate/oxidized multiwalled carbon nanotubes composites.
机构信息
Laboratory of Chemical Process Engineering, Department of Process Engineering, Faculty of Technology, University of Ferhat Abbas Setif-1, 19000, Setif, Algeria.
Laboratory of Chemical Process Engineering, Department of Process Engineering, Faculty of Technology, University of Ferhat Abbas Setif-1, 19000, Setif, Algeria.
出版信息
Int J Biol Macromol. 2019 Feb 15;123:539-548. doi: 10.1016/j.ijbiomac.2018.11.102. Epub 2018 Nov 14.
Magnetic beads (AO-γ-FeO) of alginate (A) impregnated with citrate coated maghemite nanoparticles (γ-FeO) and oxidized multiwalled carbon nanotubes (OMWCNTs) were synthesized and used as adsorbent for the removal of methylene blue from water. The XRD analysis revealed that the diameter of γ-FeO is 10.24 nm. The mass saturation magnetization of AO-γ-FeO and γ-FeO were found to be 27.16 and 42.63 emu·g, respectively. The adsorption studies revealed that the data of MB isotherm were well fitted to the Freundlich model. The Langmuir isotherm model exhibited a maximum adsorption capacity of 905.5 mg·g. The adsorption was very dependent on initial concentration, adsorbent dose, and temperature. The beads exhibited high adsorption stability in large domain of pH (4-10). The thermodynamic parameters determined at 283, 293, 303, and 313 K revealed that the adsorption occurring was spontaneous and endothermic in nature. Adsorption kinetic data followed the intraparticle diffusion model. The AO-γ-FeO beads were used for six cycles without significant adsorptive performance loss. Therefore, the eco-friendly prepared AO-γ-FeO beads were considered as highly recyclable and efficient adsorbent for methylene blue as they can be easily separated from water after treatment.
海藻酸钠（A）负载柠檬酸包裹的磁赤铁矿纳米粒子（γ-FeO）和氧化多壁碳纳米管（OMWCNTs）的磁性珠（AO-γ-FeO）被合成并用作从水中去除亚甲基蓝的吸附剂。XRD 分析表明 γ-FeO 的直径为 10.24nm。AO-γ-FeO 和 γ-FeO 的质量饱和磁化强度分别为 27.16 和 42.63emu·g。吸附研究表明，MB 的等温线数据很好地符合 Freundlich 模型。Langmuir 等温线模型表现出最大吸附容量为 905.5mg·g。吸附非常依赖于初始浓度、吸附剂剂量和温度。在较大的 pH（4-10）范围内，珠粒表现出高吸附稳定性。在 283、293、303 和 313K 下确定的热力学参数表明，吸附是自发和吸热的。吸附动力学数据符合颗粒内扩散模型。AO-γ-FeO 珠粒在没有明显吸附性能损失的情况下使用了六次循环。因此，由于处理后可从水中轻松分离，因此制备的环保型 AO-γ-FeO 珠粒被认为是亚甲基蓝的高效可回收吸附剂。
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