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首页> 外文期刊>Journal of Polymers and the Environment >Synthesis and Characterization of Magnetic Halloysite-Alginate Beads for the Removal of Lead (Ⅱ) Ions from Aqueous Solutions
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Synthesis and Characterization of Magnetic Halloysite-Alginate Beads for the Removal of Lead (Ⅱ) Ions from Aqueous Solutions

机译：磁性埃洛石-海藻酸盐微珠的合成及表征，用于从水溶液中去除铅（Ⅱ）离子

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In this study, alginate (ALG) hybrid spheres supported with magnetic halloysite nanotubes (MHNTs) were synthesized and used effectively in the removal of Pb(II) ions from aqueous solutions. MHNTs were prepared using the co-precipitation method. Afterward, magnetic halloysite-alginate (MHNT-ALG) hybrid beads were formed using ALG and MHNTs by the extrusion dripping method. The characterization of halloysite nanotubes (HNTs), ALG, MHNTs, and MHNT-ALG hydrogels was performed using FTIR, TGA, particle size analysis, SEM-EDX, TEM, VSM, and BET. According to VSM measurements, the saturation magnetization values of MHNTs and MHNT-ALG hybrid beads at a mass ratio of 1:2 were determined to be 22.7emu/g and 8.17emu/g, respectively. The BET surface area of MHNT-ALG hybrid beads was measured to be 81.3m(2)/g. The adsorption of Pb(II) ions on MHNT-ALG hydrogels was investigated as a function of the pH of the medium, amount of MHNT-ALG, the mass ratio of MHNT to ALG in the composite, and initial Pb(II) concentration in batch stirred vessels. The fit of the adsorption equilibrium of Pb(II) ions on MHNT-ALG hydrogels to the Langmuir type-I and type-II models, Freundlich model, and Redlich-Peterson model was investigated. The fit of the adsorption kinetics to the pseudo-second-order kinetics model was evaluated. Using the Weber and Morris model, the effect of internal and external diffusion limitations was discussed.
机译：在这项研究中，以磁性埃洛石纳米管（MHNTs）为载体的藻酸盐（ALG）杂化球被合成并有效地用于从水溶液中去除Pb（II）离子。使用共沉淀法制备MHNT。然后，使用ALG和MHNT通过挤出滴涂法形成磁性埃洛石-海藻酸盐（MHNT-ALG）杂化珠。使用FTIR，TGA，粒度分析，SEM-EDX，TEM，VSM和BET对埃洛石纳米管（HNT），ALG，MHNT和MHNT-ALG水凝胶进行表征。根据VSM测量，质量比为1：2的MHNT和MHNT-ALG杂化磁珠的饱和磁化值分别确定为22.7emu / g和8.17emu / g。 MHNT-ALG混合珠的BET表面积经测量为81.3m（2）/ g。研究了MHNT-ALG水凝胶对Pb（II）离子的吸附与介质pH值，MHNT-ALG量，复合物中MHNT与ALG的质量比以及Pb（II）初始浓度的关系。分批搅拌的容器。研究了MHNT-ALG水凝胶上Pb（II）离子的吸附平衡对Langmuir I型和II型模型，Freundlich模型和Redlich-Peterson模型的拟合。评估了吸附动力学对拟二级动力学模型的拟合。使用韦伯和莫里斯模型，讨论了内部和外部扩散限制的影响。

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