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• W4307934697 abstract "• ZIF grafted KCoFC (KCoFC@ZIF) attained 63% higher surface area compared to KCoFC. • KCoFC@ZIF showed 8-folds higher Rb uptake with faster kinetics compared to KCoFC. • KCoFC@ZIF maintained high capacity performance for selective Rb uptake in seawater. • Similar crystal structure of KCoFC@ZIF after 5 cycles reflects its reuse capacity. Rubidium (Rb) is a highly-priced metal due to its scarcity in ore form. Seawater is a promising alternate source for recovering Rb. Potassium cobalt hexacyanoferrate (KCoFC) ion exchange nanomaterial achieves high selective Rb recovery in seawater; however, its performance is impaired by high potassium concentration in seawater. To address this issue, this study modified the structure of KCoFC by grafting zeolitic imidazole frameworks (ZIF) with KCoFC to synthesize KCoFC@ZIF. Detailed physicochemical characterization showed the successful synthesis of KCoFC@ZIF. KCoFC@ZIF increased the surface area of the material but reduced its pore diameter, which was influenced by 2-methylimidazole (HMIM) concentration. Reducing HMIM composition to a ratio of KCoFC:HMIM:Zn 1:12:5 (KCoFC@ZIF(d)) achieved a reasonable balance in increasing the material surface area by 63% to that of KCoFC while reducing the pore diameter by only 30%. Rb uptake capacity of KCoFC@ZIF(d) (Langmuir q max 1279.35 mg/g) was 8-folds higher with accelerated kinetics compared to KCoFC ( q max 143.21 mg/g). The capacity of both KCoFC and KCoFC@ZIF(d) was reduced by about 45% in seawater due to the presence of potassium. Nevertheless, KCoFC@ZIF(d) maintained a relatively high Rb uptake of 236 mg/g in seawater due to its high Rb selective capacity; consequently, demonstrating its potential for Rb extraction from seawater. KCoFC@ZIF(d) demonstrated a similar peak structure after five consecutive operative cycles, thus, establishing its regenerative efficiency. Overall, it can be indicated that KCoFC controls the selective Rb uptake of KCoFC@ZIF. At the same time, the grafted ZIF layer acts as a catalytic layer that increases the surface area and ion dehydration of KCoFC@ZIF to enhance the Rb diffusion into the core structure of KCoFC." @default.
• W4307934697 created "2022-11-06" @default.
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• W4307934697 date "2023-02-01" @default.
• W4307934697 modified "2023-10-14" @default.
• W4307934697 title "Selective rubidium recovery from seawater with metal-organic framework incorporated potassium cobalt hexacyanoferrate nanomaterial" @default.
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• W4307934697 doi "https://doi.org/10.1016/j.cej.2022.140107" @default.
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