Solubility of NH4VO3 in NH4H2PO4-H2O and (NH4)3PO4-H2O Systems

被引：1

作者：

Gong Xu-Li ^{[1
,2
]}

Zhang Chang-Qiao ^{[1
]}

Ning Peng-Ge ^{[2
]}

Cao Hong-Bin ^{[2
]}

Zhang Yi ^{[2
]}

机构：

[1] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China

[2] Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China

来源：

ACTA PHYSICO-CHIMICA SINICA | 2016年 / 32卷 / 05期

基金：

中国国家自然科学基金;

关键词：

NH4VO3; Solubility; NH4H2PO4; solution; (NH4)(3)PO4 solution; ELECTROCHEMICAL PERFORMANCE; TRANSPORT-PROPERTIES; HIGH-PRESSURES; PHASE-DIAGRAM; VANADIUM; EXTRACTION; TEMPERATURES; SEPARATION; IRON;

D O I：

10.3866/PKU.WHXB201602194

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The solubility of ammonium metavanadate (NH4VO3) in NH4H2PO4-H2O and (NH4)(3)PO4-H2O systems at T = 298.15-328.15 K was measured using the classic isothermal dissolution method. The densities and pH values of the solutions were also determined. The solubility of NH4VO3 decreased at first and then increased with increasing NH4H2PO4 or (NH4)(3)PO4 concentrations. This was considered to be caused by the common ionic effect, chemical reaction equilibrium and ionic activity. At T= 298.15 K, the solubility of NH4VO3 in the NH4H2PO4-H2O system was the highest, and was lower in the (NH4)(3)PO4-H2O system. The solubility in the (NH4)(2)HPO4-H2O system was the lowest. The mean ionic activity coefficients were calculated for the three phosphate solutions at C = 0.5 mol . kg(-1) using the pH values and dissolution reaction constant. The mean ionic activity coefficients were the largest for the (NH4)(2)HPO4-H2O system, and were smaller for the (NH4)(3)PO4-H2O system. The mean ionic activity coefficients were the smallest for the NH4H2PO4-H2O system, which agrees with the solubility variations of NH4VO3 in the three phosphate systems.

引用

页码：1134 / 1142

页数：9

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