Degradation Of P-Chloroaniline In Aqueous Solution With Advanced Oxidation Technology Based On Pyrite Activated Persulfate

Sulfate radical (SO-4) based advanced oxidation technology is one of the most effectiveways to degrade organic pollutants.. Chlorinated aromatic compounds such as p-chloroaniline(PCA) are widely used in dye manufacturing, rubber additives, antioxidants, pharmaceuticals,pesticides and herbicides. PCA has toxic and carcinogenic effects both on animals and humanbeings. In this study, degradation of p-chloroaniline in aqueous solution by pyrite activatedpersulfate was studied.PCA degradation in aqueous solution by pyrite suspension was investigated through batchexperiments. Effects of temperature, pH and dosages of pyrite on PCA degradation were alsoexamined. An increase reaction temperature from20to50C signifcantly enhanced the PCAdegradation. The degradation of PCA increased with higher dosage of pyrite. The PCAdegradation was higher under acidic conditions. Radical scavengers (ethanol and1,4-benzoquinone) were used to determined the generation of hydroxyl radical and superoxideradical in pyrite suspension system. The results demonstrated that PCA was degraded byhydroxyl radical.The degradation of p-chloroaniline (PCA) by pyrite activated persulfate (S O2-28) wasinvestigated through batch experiments. Effects of pH, temperature, and dosages of pyrite onPCA degradation wereexamined. The degradation of PCA increased with higher dosage ofpyrite. The PCA degradation was higher under acidic conditions (pH3.0and5.0whencompared to alkaline conditions. Complete degradation of PCA was obtained at pH3.0at60minute. An increase reaction temperature from10to50C signifcantly enhanced the PCAdegradation.The degradation of PCA by pyrite activated persulfate under aerobic condiction wasinvestigated. The results showed that persulfate activation by pyrite under aerobic conditionhas significient effect on the degradation of PCA at neutral pH. The PCA degradation washigher under aerobic condition when compared to anarobic condition. The superoxide radical(O-2) generated in persulfate-pyrite system could activate the persulfate (S O2-28) to produce more sulfate radical ().