Composition and formation kinetics of sodium polyvanadates in vanadium(IV, V) solutions

We study how VO2+ ions affect the composition and formation kinetics of polyvanadate precipitates in solutions with 1 ≤ pH ≤ 3 at 80–90°C. The compounds have the general formula Na2.1−xHxVy4+V12−y5+O31−δ. nH2O (0 ≤ x ≤ 1.1, 0.2 ≤ y ≤ 2.3, 0.1 ≤ δ ≤ 1.4). The maximal vanadium(IV) concentration in the...

Full description

Saved in:
Bibliographic Details
Published in:Russian journal of inorganic chemistry 2006-03, Vol.51 (3), p.357-361
Main Authors: Podval’naya, N. V., Volkov, V. L.
Format: Article
Language:English
Subjects:
Chemical precipitation
Composition
Inorganic chemistry
Kinetics
Precipitates
Vanadium oxides
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We study how VO2+ ions affect the composition and formation kinetics of polyvanadate precipitates in solutions with 1 ≤ pH ≤ 3 at 80–90°C. The compounds have the general formula Na2.1−xHxVy4+V12−y5+O31−δ. nH2O (0 ≤ x ≤ 1.1, 0.2 ≤ y ≤ 2.3, 0.1 ≤ δ ≤ 1.4). The maximal vanadium(IV) concentration in the precipitates y = 2.2 and 2.3) is achieved for the V4+/V5+ ratio in the solution equal to 0.5 and 0.3 and pH of 1.7 and 3.0, respectively. The polyvanadate precipitation at pH 1.7 has a long induction period, which is not observed when V4+/V5+ > 0.02. In the solutions with pH 3.0, the precipitation occurs only when VO2+ are added. The processes are controlled by second-order reactions on the polyvanadate surface.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023606030041