Removal of Volatile Chlorinated Hydrocarbons in Water by Supported Nanoscale Pd/Fe Particles

Abstract

Abstract:

Control of chlorinated hydrocarbons pollution has gradually become the top research field in modern world. In order to investigate the removal ability of chlorinated hydrocarbons, the most widely existent pollutants, dichloroethylene（1.1-DCE） and Lidane（γ-HCH）were chosen as the aim pollutants,and the synthetical supported nanoscale Pd/Fe were chosen as the reaction medium. The supported Pd/ Fe bimetallic catalysts were made by the procedures of impregnation, liquid reduction, and reductive precipitation. The grain size of palladium and iron are at the nanoscale by the transmission electron microscope. The Fe/ Pd systems proved to be very effective, and the removal rate of 1.1-DCE and γ-HCH in 2 hours respectively reached about 85% and 100%. The removal of 1.1-DCE and γ-HCH in water by the supported Pd/Fe bimetallic catalysts follows the pseudofrist order kinetics with the halflife t1/2 of 1.31 h and 0.34 h. The amount of Pd/ Fe, Pd/ Fe ratio, pH and reaction temperatures are the most important factors that affect the removal efficiency and there is little relationship with the initial concentration. During the reactions, H₂，coming from eroded Fe，may be the main reducer. Pd is a good hydrogenation catalyst and it formed a high concentration reaction phase in the surface of Pd/Fe-Al₂O₃particles which accelerated the reaction rate.

Key words: supported nanoscale Pd/Fe, volatile chlorinated hydrocarbons, reaction kinetics, influence factor, reaction , mechanism

CLC Number:

X703
Q657

SHANG Hai-tao,LI Zhi-ling, YANG Qi, XI Hong-bo, HAO Chun-bo. Removal of Volatile Chlorinated Hydrocarbons in Water by Supported Nanoscale Pd/Fe Particles[J]. Geoscience, 2008, 22(2): 313-320.

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