Degradation of carbamazepine by Fe(II)-activated persulfate process

Y. F. Rao, Liang Qu, Haisong Yang, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

216 Citations (Scopus)

Abstract

Experimental studies were conducted to investigate the oxidative degradation of carbamazepine (CBZ), one of the most frequently detected pharmaceuticals in various waters, by Fe(II)-activated persulfate process. Results show that the Fe2+/S2O82-process is very effective for the elimination of CBZ and characterized by a two-stage kinetics (a rapid initial decay followed by a retardation stage). CBZ degradation reaction was observed to be pH dependent and the optimum pH is 3.0 in the range of 2.00-7.87. The concentration of Fe2+and S2O82-exhibited a noticeable influence on CBZ removal efficiency, where [S2O82-] exerted more significant effects than that of [Fe2+]. The optimal molar ratio of CBZ, Fe2+, and S2O82-is found to be 1:5:40. The effect of various inorganic anions on CBZ removal was also evaluated under the optimal conditions. The anions NO3-, SO42-and H2PO4-caused a negative effect on the performance of this process, while Cl-interestingly accelerated CBZ degradation. The higher the Cl-concentration, the faster the CBZ decay rate. The intermediates were identified during CBZ degradation with and without the presence of Cl-. The evolution of intermediates for these two scenarios was compared. The decay pathways of CBZ were proposed accordingly.
Original languageEnglish
Pages (from-to)23-32
Number of pages10
JournalJournal of Hazardous Materials
Volume268
DOIs
Publication statusPublished - 15 Mar 2014

Keywords

  • Carbamazepine
  • Decay pathways
  • Kinetics
  • Sulfate radicals

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

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