Highly efficient uranium capture from wastewater by hydroxyapatite aerogels prepared with konjac gum as template
Journal of Water Process Engineering(2022)
摘要
HAP aerogels with higher adsorption speed and capacity were synthesized through a combination of freeze-drying and template way using konjac gum (KGM) as template. Among them, B-HAP (HAP aerogel prepared with 0.25 g KGM as template) showed better micromorphology and structure, leading to more available sites on B-HAP, which was beneficial for the immobilization of uranium. The removal efficiency of uranium by B-HAP was 99.4% within 10 min and the maximum removal capacity was up to 2055.2 mg g−1, which was larger than other reported adsorbents. Pseudo-second-order and Langmuir models were better fitted with the adsorption behavior on HAP aerogels, indicating that uranium ions were immobilized on HAP aerogels via chemical adsorption. B-HAP also showed high selectivity, stability and durability, which was expected to be a feasible candidate for the extraction of uranium from wastewater.
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关键词
Adsorption,Dissolution-precipitation,Hydroxyapatite aerogel,Konjac gum,Uranium
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