[Study on dechlorination of p-chlorophenol by Ni/Fe bimetallic particles].

Dechlorination property of p-chlorophenol (p-CP) by Ni/Fe bimetallic particles was studied in this work. The experimental results show that adsorbed hydrogen atom is the main reductive agent for dechlorination of p-CP and chemical reaction at the surface of catalyst is the rate-determing step in this process. The catalyst with mass ratio of 2.96% Ni had the largest specific surface area and also had the highest dechlorination efficiencies (64% in 90 min) under the same conditions. The apparent kinetics of p-CP dechlorination by Ni/Fe was the first order reaction and apparent rate constant (kappa) was proportional to the specific surface of catalyst. The apparent rate constant per specific surface area (kappa') was also calculated (7.61 x 10(-4) min(-1) m(-2)). Temperature was also an important parameter in this system. The dechlorination efficiency was proportional to temperature when it is below 43 degrees C, when temperature exceeded 43 degrees C, increasing temperature had inverse effect on dechlorination efficiency.