Abstract

Characteristic features of the sorption interaction of magnesium(II) ions in aqueous solutions with hydroxyapatite nanoparticles used as the sorbent were elucidated. The process kinetics was found to be adequately described by a pseudo-second order model. The sorption isotherm reflects consecutive changes in the mechanisms of sorbate and sorbent interaction with increasing sorbent concentration. Two main regions in the sorption isotherm were identified. Ion exchange is the major mechanism in the first region, while in the second region it is supplemented by physical adsorption. Formally, each region can separately be described by the Langmuir model with the following parameters: adsorption coefficient K = 33.7 and 32.1 L/mol and maximum adsorption Г_∞ = 2.2 and 8.5 mol Mg/mol hydroxyapatite for the first and second regions, respectively. At high Mg²⁺ concentrations, morphological and structural changes of the sorbent were detected, which may be attributable to a chemical reaction between the components giving a new phase.

中文翻译：

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HA-Mg复合材料吸附法中Mg 2+行为的特征特征和Mg 2+对纳米羟基磷灰石结构形态的影响

摘要

阐明了水溶液中镁（II）离子与羟基磷灰石纳米颗粒作为吸附剂的吸附相互作用的特征。发现过程动力学由伪二级模型充分描述。吸附等温线反映了随着吸附剂浓度的增加，吸附剂和吸附剂相互作用机理的连续变化。确定了吸附等温线中的两个主要区域。离子交换是第一个区域的主要机理，而在第二个区域则通过物理吸附进行补充。形式上，每个区域可以单独通过Langmuir模型使用下列参数描述：吸附系数ķ = 33.7和32.1 L / mol和最大吸附Г _∞对于第一和第二区域，分别为2.2和8.5mol Mg / mol羟基磷灰石。在高Mg ²⁺浓度下，检测到吸附剂的形态和结构变化，这可能归因于产生新相的组分之间的化学反应。