Degradation of n-butyl xanthate using fly ash as heterogeneous Fenton-like catalyst

Abstract

Heterogeneous Fenton-like process using fly ash as a catalyst was studied to degrade n-butyl xanthate form aqueous solution. The different reaction parameters on the degradation efficiency of the process were investigated. The fly ash/H₂O₂ catalyst possesses a high oxidation activity for n-butyl xanthate degradation in aqueous solution. It is found that both the dosage of catalyst and initial solution pH significantly affect the n-butyl xanthate conversion efficient. The results indicate that by using 1.176 mmol/L H₂O₂ and 1.0 g/L fly ash catalyst with mass fraction of 4.14% Fe(III) oxide at pH 3.0, almost 96.90% n-butyl xanthate conversion and over 96.66% COD removal can be achieved within 120 min with heterogeneous catalysis by fly ash. CS₂ as an intermediate of n-butyl xanthate oxidation. Finally, it is demonstrated that the fly ash/H₂O₂ catalytic oxidation process can be an efficient method for the treatment of n-butyl xanthate containing wastewater.

Keywords

n-butyl xanthate / fly ash / Fenton-like / heterogeneous catalysis

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