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论文类型：期刊论文

发表时间：2016-09-05

发表刊物：JOURNAL OF HAZARDOUS MATERIALS

收录刊物：EI、PubMed、SCIE、Scopus

卷号：315

期号：315

页面范围：76-85

ISSN号：0304-3894

关键字：Pyrophosphates; Zirconium (IV); Titanium (IV); Adsorption; Uranium (VI)

摘要：A series of nanostructured pyrophosphates Zr1-xTixP2O7 (x=0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1.0), have been prepared via a facile microwave induced route in which zirconium hydroxide, titanium hydroxide and phosphoric acid were used as Zr, Ti and P sources, respectively. It is demonstrated the isomorphous substitution of Ze(4+) by Ti4+ results in a decrease of the size and an enhancement of the adsorption capacity of the obtained particles for U(VI) in aqueous solution. The maximum amount of TiP2O7 for U(VI) reached up to 309.8 mg g(-1) under the experimental conditions (pH= 5, t = 60 min and T=303 K). The as obtained specific metal pyrophosphates exhibit a considerably higher adsorption capability for U(VI) in aqueous solution compared with Zr1-xTixP2O7 prepared by calcined method, showing a high potential for U(VI) sequestration applications. The adsorption kinetics and thermodynamic analysis of Zr1-xTixP2O7 on adsorption of U (VI) were performed, and a possible adsoprtion mechanism was also proposed. (C) 2016 Elsevier B.V. All rights reserved.