核化学与放射化学 ›› 2022, Vol. 44 ›› Issue (3): 285-298.DOI: 10.7538/hhx.2022.YX.2021078

• 海水中提取铀元素 • 上一篇    下一篇

Ag3PO4/PC3N4材料的制备及其对铀的吸附性能

刘玥;刘琦;朱佳慧;张宏森;王君   

  1. 哈尔滨工程大学 材料科学与化学工程学院,黑龙江 哈尔滨150001;海南省哈工大创新研究院有限责任公司,海南 陵水572427
  • 出版日期:2022-06-20 发布日期:2022-06-20

Preparation of Ag3PO4/P-C3N4 Material and Uranium Adsorption Performance

LIU Yue;LIU Qi;ZHU Jia-hui;ZHANG Hong-sen;WANG Jun   

  1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;Hainan Harbin Institute of Technology Innovation Research Institute Co., Ltd., Lingshui 572427, China
  • Online:2022-06-20 Published:2022-06-20

摘要: 为设计一种对U(Ⅵ)具有较高吸附容量和较高选择性的吸附材料,采用石墨相氮化碳(gC3N4)与磷酸二氢铵作为原料,通过热共聚法制备PC3N4,再利用磷酸氢二钠与硝酸银通过原位共沉淀法制备Ag3PO4/PC3N4复合吸附材料。吸附实验结果表明,Ag3PO4/PC3N4复合吸附材料在室温下对U(Ⅵ)的吸附容量达到5246 mg/g;在溶液中同时存在Na+、K+、Mg2+、Ca2+、Sr2+、Zn2+、Ni2+和Co2+等竞争离子时,对U(Ⅵ)的吸附分配系数达到613×103 mL/g。XPS分析结果表明,Ag3PO4/PC3N4复合吸附材料中的含N和含P官能团可能参与U(Ⅵ)吸附过程。因此,Ag3PO4/PC3N4复合吸附材料是一种对U(Ⅵ)具有较高吸附容量和较高选择性的吸附材料。

关键词: g-C3N4, 吸附性能, U(Ⅵ), 选择性

Abstract: In order to design an adsorption material with higher selectivity to U(Ⅵ) 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.

Key words: g-C3N4, adsorption property, U(Ⅵ), selectivity