http://dx.doi.org/10.1016/j.jhazmat.2008.07.110">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Degradation of diphenylamine by persulfate: Performance optimization, kinetics and mechanism

Language

English

Abstract

The degradation of diphenylamine (DPA) in aqueous solution by persulfate is investigated. Effects of pH, persulfate concentration, ionic strength, temperature and catalytic ions Fe3+ and Ag+ on the degradation efficiency of DPA by persulfate are examined in batch experiments. The degradation of DPA by persulfate is found to follow the pseudo-first-order kinetic model. Increasing the reaction temperature or persulfate concentration may significantly accelerate the DPA degradation. Fe3+ and Ag+ ions can enhance the degradation of DPA, and Ag+ ion is more efficient than Fe3+ ion. However, the increase of either the pH value or ionic strength will decrease the rate of DPA degradation. N-Phenyl-4-quinoneimine, N-carboxyl-4-quinoneimine, 4-quinoneimine and oxalic acid are identified as the major intermediates of DPA degradation, and a primary pathway for the degradation of DPA is proposed. The degradation of DPA in surface water, groundwater and seawater is also tested by persulfate, and more than 90% of DPA can be degraded at room temperature in 45 min at an initial concentration of 20 mg L-1. © 2008 Elsevier B.V. All rights reserved.

Keywords

Degradation, Diphenylamine, Kinetics, Mechanism, Persulfate

Publication Date

2009

Source Publication Title

Journal of Hazardous Materials

Volume

164

Issue

1

Start Page

26

End Page

31

Publisher

Elsevier

ISSN (print)

03043894

ISSN (electronic)

18733336

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