Abstract
Kinetics of 2-chlorobiphenyl (2-Cl BP) catalytic reductive dechlorination by Pd-Fe 0 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-Cl BP. Up to 95.0% of 2-Cl BP was removed after 300 min reaction with the following experimental conditions: initial 2-Cl BP concentration 10 mg L -1 , Pd content 0.8 wt. %, bimetallic Pd-Fe 0 nanoparticles prepared in the presence of ultrasound available dosage 7g L -1 , initial pH value in aqueous solution 3.0, and reaction temperature 25°C. The catalytic reductive dechlorination of 2-Cl BP followed pseudo-first-order kinetics and the apparent pseudo-first-order kinetics constant was 0.0143 min -1 .
Highlights
Historical and continued releases of polychlorinated biphenyls (PCBs) to the environment have resulted in polluted water, soil, and sediment [1]
Pd-Fe0 bimetallic nanoparticles, when compared to the conventional large particles have some advantages with possessing large specific surface area and high surface reactivity [6]
In order to obtain the stabilized and high reactive Pd-Fe0 bimetallic nanoparticles, ultrasound is applied to the preparation of Pd-Fe0 nanoparticles because acoustic cavitation can enhance the surface area and surface properties of the reactive solids by causing particles to rupture [7]
Summary
Historical and continued releases of polychlorinated biphenyls (PCBs) to the environment have resulted in polluted water, soil, and sediment [1] These contaminated soils, sludges and groundwater need to be effectively remediated at ambient temperatures using either ex situ or in situ methods. Methods for PCBs dechlorination include chemical reduction, catalyzed hydrodechlorination, and electrolytic dechlorination. Most of these techniques use highly active reducing hydrogen from different sources to facilitate the dechlorination through the use of noble metal catalysts such as palladium (Pd) and rhodium (Rh), etc [2,3,4]. Pd-Fe0 bimetallic nanoparticles, when compared to the conventional large particles have some advantages with possessing large specific surface area and high surface reactivity [6]. In order to obtain the stabilized and high reactive Pd-Fe0 bimetallic nanoparticles, ultrasound is applied to the preparation of Pd-Fe0 nanoparticles because acoustic cavitation can enhance the surface area and surface properties of the reactive solids by causing particles to rupture [7]
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