Highly dispersed Pd/Fe nanoparticles were prepared by using ultrasound-assisted liquid phase reductive method

and used for reductive dechlorination of 4-chlorophenol(4-CP).The affecting factors and degradation kinetics were investigated.The experimental results showed that:obvious modification was achieved on the particle size

most of them less than 100nm

and on specific surface areas

increased 43.42%.The efficiency of 4-CP reductive dechlorination was up to 97% on the Pd/Fe nanoparticles with Pd mass fraction 0.2% and its dosage 2.5 g·L-1 at the conditions:time 300 min

initial 4-CP concentration 20 mg·L-1

pH value 3.0

and reaction temperature 30℃.The degradation reaction of 4-CP followed pseudo-first-order kinetics and the apparent pseudo-first-order kinetics constant was 1.76×10-2 min-1.