Ecole des mines d'Alès, Centre des Matériaux des Mines d'Alès, F-30319 Alès cedex, France; Wrocław University of Technology, Faculty of Chemistry, P-50-370 Wrocław, Poland.
J Colloid Interface Sci. 2013 Nov 1;409:141-50. doi: 10.1016/j.jcis.2013.07.046. Epub 2013 Jul 31.
Ammonium molybdophosphate and Phozir (alone or in combination) have been encapsulated in alginate beads for the synthesis of rubidium sorbents. SEM and SEM-EDX analyses confirm the homogeneity of the sorbents in terms of composition and metal binding. AMP sorbent is less sensitive to pH than Phozir, and optimum pH is close to pH 3 for the binding of Rb(I). The Langmuir equation fitted well sorption isotherms and the maximum sorption capacities were in the range 0.65-0.74 mmol Rb g(-1). The resistance to intraparticle diffusion contributes to control uptake kinetics (effect of particle size) though the presence of solid inorganic particles reduces the impact of drying alginate capsules (preventing the collapse of the porous structure during the drying step). Breakthrough curves demonstrate the potential of these sorbents for the dynamic sorption of Rb(I) while using ammonium chloride (combined to nitric acid) allows recovering Rb(I) from loaded sorbents.
磷钼酸铵和 Phozir（单独或组合）已被包封在藻酸盐珠中，用于合成铷吸附剂。SEM 和 SEM-EDX 分析证实了吸附剂在组成和金属结合方面的均一性。AMP 吸附剂对 pH 的敏感性低于 Phozir，并且 Rb(I) 结合的最佳 pH 接近 pH 3。Langmuir 方程很好地拟合了吸附等温线，最大吸附容量在 0.65-0.74mmol Rb g(-1)范围内。颗粒内扩散的阻力有助于控制吸收动力学（粒径的影响），尽管存在固体无机颗粒会降低干燥藻酸盐胶囊的影响（防止多孔结构在干燥步骤中塌陷）。穿透曲线表明了这些吸附剂对 Rb(I)的动态吸附的潜力，而使用氯化铵（与硝酸结合）可以从负载的吸附剂中回收 Rb(I)。
