Effects of organic acids and initial solution pH on photocatalytic degradation of bisphenol A (BPA) in a photo-Fenton-like process using goethite (α-FeOOH)

Guangshan Zhang, Qiao Wang, Wen Zhang, Tian Li, Yixing Yuan, Peng Wang

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25 Scopus citations

Abstract

This work investigated the effects of organic acids and initial solution pH on the photodegradation of BPA in a photo-Fenton-like process using α-FeOOH as a catalyst. The results showed that the addition of different organic acids affected the formation of the ferric-carboxylate complexes and free radicals, which in turn varied the photodegradation efficacy. Compared with the other acids, oxalic acid (OA) was found to be the most effective in enhancing the photodegradation of BPA, which strongly depends on the OA concentration. Particularly, the addition of OA could significantly extend the working pH from an acidic to a neutral range for the photocatalytic process and thus the acidification pretreatment may not be needed. A high photocatalytic degradation of BPA occurred at pH 6.0, due to the formation of ferric-oxalate complexes and OH radicals in the synergistic interactions of OA and α-FeOOH. This finding highlights that the oxalate-promoted photo-Fenton-like process using the α-FeOOH catalyst may be used for wastewater treatment without pH adjustment.

Original languageEnglish (US)
Pages (from-to)1046-1053
Number of pages8
JournalPhotochemical and Photobiological Sciences
Volume15
Issue number8
DOIs
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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