Kinetics of 2-chlorobiphenyl Reductive Dechlorination by Pd-fe° Nanoparticles

摘要

Kinetics of 2-chlorobiphenyl (2-C1 BP) catalytic reductive dechlorination by Pd-Fe° nanoparticles were investigated. Experimental results showed that ultrafine bimetallic Pd-Fe~0 e nanoparticles were synthesized in the presence of 40 kHz ultrasound in order to enhance disparity and avoid agglomeration. The application of ultrasonic irradiation during the synthesis of Pd-Fe~0 nanoparticles further accelerated the dechlorinated removal ratio of 2-C1 BP. Up to 95.0% of 2-C1 BP was removed after 300 min reaction with the following experimental conditions: initial 2-C1 BP concentration 10 mg L~(-1), Pd content 0.8 wt. %, bimetallic Pd-Fe~0 nanoparticles prepared in the presence of ultrasound available dosage 7 g L~(-1), initial pH value in aqueous solution 3.0, and reaction temperature 25°C. The catalytic reductive dechlorination of 2-C1 BP followed pseudo-first-order kinetics and the apparent pseudo-first-order kinetics constant was 0.0143 min~(-1).