Study on the extraction mechanism and thermodynamics of Pb(II) with a o-phenylendiamine tetraacetic acid


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The extraction mechanism and thermodynamics of Pb(II) with a novel o-phenylendiamine tetraacetic acid (H4PDTA) were studied by high performance liquid chromatography with UV detector. The effects of extraction time, reciprocating oscillation frequency, Pb(II) concentration, H4PDTA concentration and Pb(II) solution acidity on Pb(II) extraction were investigated. The results showed that the extraction ratio of Pb(II) increased with an increase of pH and H4PEDTA concentration with a reciprocating oscillation frequency of 120 CPM (cycles per minute). The composition of the extraction complex was determined by slope methods and UV spectral analysis. The extraction mechanism of Pb(II) was proved to be a chelate extraction reaction and the values of thermodynamic function at 25°C were determined: \(\overline {K_{ex} } = 2.18 \times 10^3\), ΔGr = –19.05 kJ mol–1, ΔHr = –9.965 kJ mol–1 and ΔSr = 30.47 J mol–1 K–1.

About the authors

Junwei Wang

College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds

Email: dongyjaqtc@163.com
China, Anqing, 246011

Dan Zhang

College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds

Email: dongyjaqtc@163.com
China, Anqing, 246011

Yanjie Dong

College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds

Author for correspondence.
Email: dongyjaqtc@163.com
China, Anqing, 246011

Lu Lu

College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds

Email: dongyjaqtc@163.com
China, Anqing, 246011

Wei Wang

College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds

Email: dongyjaqtc@163.com
China, Anqing, 246011

Yuanguang Zhang

College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds

Email: dongyjaqtc@163.com
China, Anqing, 246011

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2017 Allerton Press, Inc.