Abstract
This study deals with employing foundry sand (FS) as new low cost iron source in heterogeneousphoto-Fenton process for the degradation of herbicide isoproturon (IPU) in aqueous solution. Thecharacterization of the FS by EDS confirmed presence of iron (23%) required for photo-Fenton andsimultaneously confirmed absence of any heavy metals which may be susceptible to leaching. The photo-Fenton effects of different reaction parameters like H2O2 concentration [H2O2]0, operating pH, initialconcentration of IPU [C0], FS dose, recycling of FS, effect of area/volume ratio were investigated. Resultsshowed that the maximal removal efficiency were achieved when reaction parameters were [H2O2]0= 2.2 mM,pH 3, FS dose=0.5 g/L, [C0] =25 mg/L. Under optimum condition, 97% degradation efficiency of IPU wasachieved within 150 min of reaction. The catalyst recycling test was performed and FS was effectivelyrecycled for 4 times with 20% reduction in degradation efficiency. SEM-EDS analysis of recycled FS confirmedmorphology of FS unchanged. Solar baffled batch reactor (SBBR) with recirculation confirmed 70% degradationof IPU after 6 h. IPU mineralization was confirmed with TOC reduction, NH4+ generation along with formationof intermediates as confirmed through LC-MS.
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