Abstract

The adsorption of Ni(II), Zn(II), and Cu(II) ions by electrogenerated gibbsite (γ-modification aluminum hydroxide) has been studied. Electrically generated gibbsite was obtained by electrolysis of aqueous solutions using aluminum electrodes. We used gibbsite obtained during the first 5 min of electrolysis. Such an adsorbent has an amorphous state and a network structure and, as a consequence, has good adsorption capacity. The adsorption value for Ni(II) ions was 437.0 mg/g; for Zn(II), 362.5 mg/g; and for Cu(II), 148.8 mg/g. The obtained isotherms have a stepwise character, which is explained by the inhomogeneity of the adsorbing surface, on which there are groups of active centers that differ sharply from each other in their activity. The adsorption of toxic ions was studied using the Langmuir, Freundlich, and Dubinin–Radushkevich models. The values of the correlation coefficients indicate that the adsorption of Zn(II) Cu(II) ions is best described by the Langmuir model, and the adsorption of Ni(II) ions, by the Dubinin–Radushkevich model. On the basis of the Dubinin–Radushkevich adsorption model, the values of the free adsorption energy are determined, which indicate the physical nature of the interaction between the adsorptive and the adsorbent. The adsorption of toxic ions on the gibbsite surface occurs mainly due to dispersion interaction.

中文翻译：

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电生菱铁矿吸附有毒离子的研究。

摘要

研究了电生成三水铝石（γ-改性氢氧化铝）对Ni（II），Zn（II）和Cu（II）离子的吸附。通过使用铝电极电解水溶液来获得电产生的三水铝石。我们使用在电解的前5分钟获得的三水铝石。这种吸附剂具有非晶态和网状结构，因此具有良好的吸附能力。Ni（II）离子的吸附值为437.0 mg / g；对于Zn（II），为362.5 mg / g; 对于Cu（II），为148.8 mg / g。所获得的等温线具有逐步的特征，这可以用吸附表面的不均匀性来解释，在该表面上存在着一组活性中心，这些活性中心的活性彼此截然不同。使用Langmuir，Freundlich和Dubinin–Radushkevich模型研究了有毒离子的吸附。相关系数的值表明，用Langmuir模型最好地描述Zn（II）Cu（II）离子的吸附，而用Dubinin–Radushkevich模型最好地描述Ni（II）离子的吸附。根据Dubinin–Radushkevich吸附模型，确定了自由吸附能的值，该值表明了吸附剂与吸附剂之间相互作用的物理性质。有毒离子在三水铝石表面的吸附主要是由于分散相互作用所致。表示吸附剂和吸附剂之间相互作用的物理性质。有毒离子在三水铝石表面的吸附主要是由于分散作用引起的。表示吸附剂和吸附剂之间相互作用的物理性质。有毒离子在三水铝石表面的吸附主要是由于分散作用引起的。