Study on the extraction mechanism and thermodynamics of Pb(II) with a o-phenylendiamine tetraacetic acid
- Authors: Wang J.1, Zhang D.1, Dong Y.1, Lu L.1, Wang W.1, Zhang Y.1
-
Affiliations:
- College of Chemistry and Chemical Engineering, Anhui Key Laboratory of Functional Coordination Compounds
- Issue: Vol 58, No 4 (2017)
- Pages: 351-356
- Section: Metallurgy of Nonferrous Metals
- URL: https://journals.rcsi.science/1067-8212/article/view/226266
- DOI: https://doi.org/10.3103/S1067821217040071
- ID: 226266
Cite item
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
