Preparation of AgPO/P-CN Material and Uranium Adsorption Performance

In order to design an adsorption material with higher selectivity to U(YI) while ensuring a higher adsorption capacity, g-CN and ammonium dihydrogen phosphate were used as raw materials to prepare P-CN by thermal copolymerization. The AgPO/P-CN composite adsorption material was prepared by in-situ co-precipitation method using disodium hydrogen phosphate and silver nitrate. The results of adsorption experiments show that the adsorption capacity of AgPO/P-CN composite adsorbent for U(VI) reaches 524. 6 mg/g at room temperature; the distribution coefficient to U(VI) reaches 6.13 × 10 mL/g with competing ions such as Na, K, Mg, Ca, Sr, Zn, Ni and Co in solution. XPS analysis result shows that the N- and P-containing functional groups in the AgPO/P-CN composite adsorption material may participate in the U(VI) adsorption process. Therefore, the AgPO/P-CN composite adsorption material is one kind of adsorption material with higher adsorption capacity and higher U(VI) selectivity.