犃犵３犘犗４／犘 犆３犖４ 材料的制备及其对铀的吸附性能

In order to design an adsorption material with higher selectivity to U(YI) while ensuring a higher adsorption capacity, g-C₃N₄ and ammonium dihydrogen phosphate were used as raw materials to prepare P-C₃N₄ by thermal copolymerization. The Ag₃PO₄/P-C₃N₄ 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 Ag₃PO₄/P-C₃N₄ composite adsorbent for U(VI) reaches 524. 6 mg/g at room temperature; the distribution coefficient to U(VI) reaches 6.13 × 10³ mL/g with competing ions such as Na⁺, K⁺, Mg²⁺, Ca²⁺, Sr²⁺, Zn²⁺, Ni²⁺ and Co²⁺ in solution. XPS analysis result shows that the N- and P-containing functional groups in the Ag₃PO₄/P-C₃N₄ composite adsorption material may participate in the U(VI) adsorption process. Therefore, the Ag₃PO₄/P-C₃N₄ composite adsorption material is one kind of adsorption material with higher adsorption capacity and higher U(VI) selectivity.