Optimization of the Degradation of Hydroquinone, Resorcinol and Catechol Using Response Surface Methodology

Noureddine Elboughdiri^1,2*, Ammar Mahjoubi^1,2, Ali Shawabkeh¹, Hussam Elddin Khasawneh¹, Bassem Jamoussi³

¹Department of Chemical Engineering, College of Engineering, University of Hail, Hail, KSA.
²Department of Chemical Engineering Process, National School of Engineering of Gabes, Gabes, Tunisia.
³Department of Physical, High Institute of Education and Continuing Formation, Bardo, Tunisia.

DOI: 10.4236/aces.2015.52012                

Abstract

A clay catalyst (montmorillonite and kaolinite) was prepared and used to degrade three phenolic compounds: hydroquinone, resorcinol and catechol obtained from the treatment the Olive Mill Wastewater (OMW) generated in the production of olive oil. The operating conditions of the degradation of these compounds are optimized by the response surface methodology (RSM) which is an experimental design used in process optimization studies. The results obtained by the catalytic tests and analyses performed by different techniques showed that the modified montmorillonites have very interesting catalytic, structural and textural properties; they are more effective for the catalytic phenolic compound degradation, they present the highest specific surface and they may support iron ions. We also determined the optimal degradation conditions by tracing the response surfaces of each compound; for example, for the catechol, the optimal conditions of degradation at pH 4 are obtained after 120 min at a concentration of H₂O₂ equal to 0.3 M. Of the three phenolic compounds, the kinetic degradation study revealed that the hydroquinone is the most degraded compound in the least amount of time. Finally, the rate of the catalyst iron ions release in the reaction is lower when the Fe-modified montmorillonites are used.

Keywords

Fenton Process, Fe-Modified Clay, Phenolic Compounds, Response Surface Methodology

Conflicts of Interest

The authors declare no conflicts of interest.

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