Pentachlorophenol removal from aqueous solutions by microwave/persulfate and microwave/H2O2: a comparative kinetic study

Pentachlorophenol (pcp) is one of the most fungicides and pesticides used in wood protection. poisoning frompcp may be happened in dermal absorption, and respiration or ingestion. with regard to health and environmentaleffects of pcp, many methods were studied for its removal. microwave assisted other methods are environmentalfriendly, safety, and economical method, therefore, in this study; a modified domestic microwave assisted hydrogenperoxide (mw/h2o2) and sodium persulfate (mw/sps) was used for pcp removal from aqueous solutions. pcpremoval rate was measured under different factors such as ph, energy intensity, sps, h2o2 concentration, tert- butylalcohol (tba) and chemical oxygen demand (cod). the concentration changes of pcp were determined usingspectrophotometer and hplc spectra, respectively. the best removal pcp rate obtained in condition of ph of 11,0.02 mol l?1 of sps, 0.2 mol l?1 of h2o2 and energy intensity of 600 w. moreover, cod removals in mw/h2o2 andmw/sps process were 83% and 94%, respectively, also tba test decreased 15% and 3% of pcp removal in mw/spsand mw/h2o2 processes respectively. experimental results indicated that sulfate radical was stronger than hydroxylradical and examinations order reaction was in first order. in this study, was cleared that mw/sps process was moreeffective than mw/h2o2 process in pcp removal.