Preparation of amino-modified hydroxyapatite and its uranium adsorption properties
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The amino-hydroxyapatite (HAP-NH2) was synthesized by grafted amino functional groups onto hydroxyapatite. The uranium adsorption performance of HAP-NH2 was studied under different conditions. The results indicated that HAP-NH2 possessed high adsorption capacity (96 mg g−1), wide pH values range (2–8) and fast adsorption rate (20 min). The adsorption kinetic and adsorption isotherm models of HAP-NH2 revealed that the uranium adsorption process was belonged to chemical adsorption. Furthermore, the main forces between uranium ions and HAP-NH2 were attributed to hydroxyl, amino and phosphorous functional groups.
KeywordsHydroxyapatite Amino modified Uranium Adsorption
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51702189, 51802176, 51472146), Shandong Provincial Natural Science Foundation (Grant Nos. ZR2017BEM033, ZR2017QEM002), and Science and Technology Development Project of Shandong Province (2014GZX201008).
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