Abstract
Sonication-assisted photo-Fenton oxidation of an endocrine disrupting compound, bisphenol-A (BPA), was studied under visible-light irradiation in the presence of a LaFeO3 perovskite catalyst. The effects of the parameters: initial BPA concentration ([BPA]0), H2O2 concentration ([H2O2]0), catalyst loading, initial pH of the BPA solution, and reaction temperature were studied on the sonication-assisted photo-Fenton oxidation of an aqueous BPA solution. The optimum conditions for the oxidation were determined to be: [BPA]0 = 10 ppm, [H2O2]0 = 4.8 mM, catalyst loading = 0.75 g L–1, pH = 2.6, temperature = 313 K. During all runs, sonication power of 40 W, visible lights power of 150 W+150 W, BPA solution volume (0.5 L), and stirring speed of 500 rpm were kept constant. Under these conditions, degradation of 56.3 %, COD removal of 50.9 %, and TOC removal of 15.6 % were achieved after 6 h of reaction. The small amount of iron that leached into the solution indicated high stability of the catalyst. The sonication-assisted photo-Fenton oxidation of BPA was described by the second order kinetics with an activation energy of 15.34 kJ mol–1. Toxicity tests were also performed and the results revealed that the intermediates formed in the sonication-assisted photo-Fenton oxidation of BPA were less toxic compared to the parent BPA molecule at a neutral pH value. However, the same interpretation was not valid at the acidic pH of 2.6.
Highlights
Bisphenol-A (BPA) is widely used in the plastic industry to produce epoxy resins and polycarbonate polymers
As the highest BPA degradation and Chemical Oxygen Demand (COD) removal were obtained in sonication-assisted photo-Fenton process, in the present study, a detailed parametric investigation was conducted for degradation of BPA, effects of the initial BPA concentration, H2O2 concentration, catalyst loading, initial pH of the BPA solution, and reaction temperature were studied in the sonication-assisted photo-Fenton oxidation of an aqueous BPA solution
The effect of the H2O2 concentration on the heterogeneous sonication-assisted photo-Fenton oxidation of BPA was investigated at the temperature of 298 K, with 0.50 L of 15 ppm (0.066 mM) BPA solution, 0.5 g L–1 of LaFeO3 perovskite catalyst, at an initial pH of 6.7, along with keeping the ultrasonic power, visible light power, and stirring speed constant at 40 W, 150 W + 150 W, 500 rpm, respectively
Summary
Bisphenol-A (BPA) is widely used in the plastic industry to produce epoxy resins and polycarbonate polymers. A broad spectrum of scientific studies was reported on BPA removal from aqueous systems through various Advanced Oxidation systems, AOPs,[6,7,8,9,10,11,12,13,14,15,16] such as sonication, Fenton reaction, photocatalytic reaction, electro-catalytic oxidation, and ozonation. These methods were used either individually or in combination. The combined AOPs of sonication, heterogeneous Fenton oxidation and photodegradation in the presence of visible light was used in degradation of BPA aqueous solution
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
