Selective Oxidative Degradation of Toluene for the Recovery of Surfactant by an Electro/Fe²⁺/persulfate Process

Overview

Journal Environ Sci Pollut Res Int

Publisher Springer

Specialties Environmental Health
Toxicology

Date 2015 Apr 8

PMID 25847443

Citations 1

Authors

Anhua Long

Hui Zhang

Affiliations

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Abstract

An electro/Fe(2+)/persulfate process has been conducted for toluene removal from surfactant (SDS) flushing solution, and the pseudo-second-order reaction rate constant (k2 value) of toluene removal has been optimized by a response surface methodology (RSM). The results indicated that in this process, the reaction between persulfate and externally added Fe(2+) generates sulfate-free radicals, and at the same time, Fe(2+) is electro-regenerated at the cathode by the reduction of Fe(3+). RSM based on Box-Behnken design (BBD) has been applied to analyze the experimental variables, of which the concentrations of persulfate and Fe(2+) showed a positive effect on the rate constant of toluene removal, whereas the concentration of SDS showed a negative effect. The interactions between pairs of variables proved to be significant, such as between SDS, persulfate, and Fe(2+) concentrations. ANOVA results confirmed that the proposed models were accurate and reliable for analysis of the variables of the electro/Fe(2+)/persulfate process. The shapes of the 3D response surfaces and contour plots showed that the SDS, persulfate, and Fe(2+) concentrations substantially affected the k2 value of toluene removal. The results indicated that increasing persulfate or Fe(2+) concentration increased the k2 value, whereas increasing SDS concentration decreased the k2 value. The reaction intermediates have been identified by GC-MS, and a plausible degradation pathway for toluene degradation is proposed.

Citing Articles

Persulfate-assisted photodegradation of diethylstilbestrol using monoclinic BiVO under visible-light irradiation.

Liu Y, Zhang Y, Guo H, Cheng X, Liu H, Tang W Environ Sci Pollut Res Int. 2016; 24(4):3739-3747.

PMID: 27888484 DOI: 10.1007/s11356-016-8020-3.

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