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Degradation of CTAB by UV/H2O2 AOP – Optimization of process parameters

Authors : Bijoli Mondal *a, Asok Adak b and Pallab Datta c


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Abstract

In the present study, the most popularly statistical tool, response surface methodology (RSM) has been used to optimize the important process parameters such as peroxide dose, initial concentration of cetyltrimethyl ammonium bromide (CTAB), pH and NO3 – concentration for degradation of CTAB from wastewater by UV/H2O2 advanced oxidation process (AOP). Experimental design and optimization of the degradation process were done by central composite design (CCD). Results revealed that increase in CTAB concentration and nitrate concentrations adversely affect the CS degradation. On the other hand, higher H2O2 concentration and pH showed an increase in fluence-based rate constant upto a maximum followed by decrease in degradation rate upon further increase in concentration of each factor. The maximum fluence-based rate constant (0.0044 cm2mJ–1) for degradation of CTAB was obtained at optimized conditions of 100 mg L–1 of CTAB, 0.25 mM of nitrate concentration of NO3 – and 1 mol H2O2 per mol of CTAB at the solution pH of 7.

Keyword

UV-H2O2, CTAB, rate constant, response surface method, central composite design