Abstract
AbstractPerchlorate contamination of drinking water and groundwater is a worldwide concerned issue, and technologies are needed for the treatment of aqueous perchlorate. In this study, activated carbon fibers (ACFs) and quaternary ammonium chloride surfactant-modified ACFs were tested for perchlorate removal from aqueous solution. The ACFs modified by cetyltrimethyl ammonium chloride (CTAC) exhibited the best performance on perchlorate adsorption. Batch experiments were performed to investigate the equilibrium, thermodynamics, kinetics, and mechanism of perchlorate adsorption onto CTAC-ACFs. The results showed that the spontaneous perchlorate adsorption process followed the Langmuir isotherm and the pseudo-second-order kinetic model. Perchlorate adsorption onto CTAC-ACFs was enhanced as the initial perchlorate concentration, contact time, and solution temperature increased. Alkaline pH and higher ionic strength did not favor the adsorption of perchlorate. Ion exchange between the perchlorate and carried c...
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