Removal of Perchlorate by Zero-valent Magnesium and Cu/Mg Bimetallic Particles
Date Issued
2008
Date
2008
Author(s)
Chang, Chia-Chuan
Abstract
Perchlorate (ClO4-) has been identified as an emerging contaminant by U.S. EPA. In this study, zero-valent magnesium and Cu/Mg bimetallic particles were used to remove perchlorate in open system. Source of Cu, loading ratio, dosage, initial concentration, and temperature were considered variables during the experiments to investigate the effects of the different conditions on perchlorate removal rate. In addition, intermediate, chlorate (ClO3-) and chlorite (ClO2-), were as reactants to investigate the pathway of the reactions of perchlorate with Cu/Mg bimetallic particles. The loading source of Cu were from Cu(NO3)2 , CuCl2, and CuSO4. The experiments suggested that the highest removal rate, 76%, was achieved by 20% Cu/Mg bimetallic particles loaded from Cu(NO3)2 and 20 g/L was the optimal dosage. However, the initial rapid drop of perchlorate within 1 minute was not matched by an immediate increase in chloride (Cl-) concentration. Intermediate, chlorate and chlorate, were also undetected. The adsorption experiment data have good fit for both Langmuir and Freundlich adsorption isotherm. Therefore, adsorption were considered the primary removal mechanism in the beginning of the reactions.
Subjects
adsorption isotherm
Cu/Mg bimetallic particles
open system
perchlorate
zero-valent magnesium
Type
thesis
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