With the increasing demand for rubidium resources, the development of adsorbents that can be simply, quickly and selectively extracted is of great importance. In this study, a novel magnetic ion...
Specific ion exchangers/adsorbents are used to separate low concentration rubidium (Rb) resources from seawater or salt lakes, especially potassium cobalt hexacyanoferrate (KCoFC) with high adsorption capacity and selectivity for Rb + . However, there are great challenges in recovery from solution for powder form KCoFC. Herein, a new immobilization strategy was presented, and KCoFC was encapsulated by synthetic hydrogels of hydroxypropyl cellulose/polyvinyl alcohol/reduced graphene oxide (KCoFC-HPR). Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were employed to indicate the correct encapsulation of KCoFC. The adsorption behavior of KCoFC-HPR for Rb + was investigated, and the results demonstrated that the process conformed to pseudo-second-order kinetic model and Langmuir isotherm model with the exchange of Rb + and K + as main adsorption mechanism. The maximum adsorption capacity for Rb + on KCoFC-HPR achieved 211.2 mg g À1 at 25 C. The interference of lithium and sodium ions (Li + /Na + :Rb + = 20:1) on the adsorption capacity proved negligible. Within 24 h, 77.9% of adsorbed Rb + on KCoFC-HPR in 0.5 mol L À1 NH 4 Cl/HCl mixture was desorbed, and adsorption capacity for the regenerated sample was 88.1% of the initial sample.
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