Effects of key reaction parameters on the reductive dechlorination of chloroform with Pd/Fe0 bimetal in aqueous solution

Abstract

In this study, bimetallic Pd/Fe0 particles were synthesized and employed to reduce chloroform in aqueous solution. The investigation emphasized on the effects of some key reaction parameters including Pd/Fe0 dosage, pH, oxidation-reduction potential (ORP) and presence of anions on the reductive dechlorination reaction. The experimental results showed that high Pd/Fe0 dosage, low initial pH and low ORP benefited the reductive dechlorination of chloroform. The ORP values in the aqueous chloroform solution bubbled with different gases of N2, O2 and air varied significantly and the efficiency of chloroform degradation under different atmospheres followed an order from high to low as N2 > air > O2. The experiments also demonstrated that SO4 2 − and NO3 − ions inhibited the dechlorination reaction significantly, while H2PO4 − ion had no significant influence on the dechlorination.