羟基磷灰石去除核纯水中的142Pr

M. Solache-Ríos, M. Jiménez-Reyes, P. T. Almazán-Sánchez
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引用次数: 1

摘要

摘要研究了羟基磷灰石对镨的吸附性能。采用x射线衍射(JCPDS 01-04-3708)、扫描电镜、BET比表面积(54.2 m2/g)和零电荷点(6.5)对羟基磷灰石(HAP)进行了表征。用伽马能谱仪测定了142Pr在pH = 3时的吸附动力学和等温线。对镨的吸附速度快(接触1 min),吸附量为1.68 mg/g,符合拟二阶模型,吸附等温线符合Langmuir模型,最大吸附量为39.16±0.20 mg/g。热力学参数表明,HAP对镨的吸附发生了物理化学机理(吸附焓为31.65 kJ/mol),系统的随机性增大(吸附熵为0.16 kJ/mol),根据吉布斯自由能,吸附过程在高温下是自发的。羟基磷灰石中的镨是稳定的,用不同的溶液(硫酸铵、氯化钙、氯化钠、盐酸和氢氧化钠)都不能解吸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Removal of 142Pr from nuclear purity water using hydroxyapatite
Abstract The adsorption of praseodymium using hydroxyapatite was evaluated. The hydroxyapatite (HAP) was characterized by X-ray diffraction (JCPDS 01-04-3708), scanning electron microscopy, BET specific surface area (54.2 m2/g), and point of zero charge (6.5). Adsorption kinetics and isotherms were evaluated at pH of 3 and 142Pr was determined using a gamma spectrometer. The adsorption of praseodymium was fast (1 min of contact) with an adsorption capacity of 1.68 mg/g and the data were best adjusted to the pseudo-second-order model, whereas the data of adsorption isotherm were best adjusted to the Langmuir model with a maximum adsorption capacity of 39.16 ± 0.20 mg/g. The thermodynamic parameters indicated that a physicochemical mechanism took place in the adsorption of praseodymium by HAP (adsorption enthalpy = 31.65 kJ/mol), the randomness of the system increased (adsorption entropy = 0.16 kJ/mol), and according with Gibbs free energy, the adsorption process was spontaneous at high temperature. The praseodymium in the hydroxyapatite is stable, it could not be desorbed using different solutions (ammonium sulfate, calcium chloride, sodium chloride, hydrochloric acid, and sodium hydroxide).
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