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Removal of dye from aqueous solution via an adsorption-high temperature gas flow regeneration method on Co-Fe/sepiolite

Authors

  • Xiangfeng Lin,

    1. School of Environment and Resource, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin, China
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  • Jinyu Feng,

    1. School of Environment and Resource, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin, China
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  • Jian Fang,

    1. School of Environment and Resource, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin, China
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  • Menglin Chen,

    Corresponding author
    1. School of Environment and Resource, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin, China
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  • Zhi Huang

    1. School of Environment and Resource, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin, China
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Abstract

A new adsorbent/catalyst Co-Fe/sepiolite was prepared and tested for its potential application in dye wastewater. Co-Fe/sepiolite acted as an adsorbent at adsorption stage, then was used as a catalyst, which accelerated regeneration speed and increased the regeneration rate during regeneration. The efficiency of this adsorbent/catalyst was investigated using crystal violet (CV) as a model pollutant. Through the sorption capacity of the Co-Fe/sepiolite, the dye was removed from wastewater, the adsorbent was regenerated subsequently by high temperature gas flow catalytic oxidation, accompanied by the decomposition of CV. CV was oxidized into CO2, CO, NO, and CH compounds during regeneration, the formation of these compounds as final products made it possible to regenerate the Co-Fe/sepiolite by high temperature gas flow. The effect of heat treatment on Co-Fe/sepiolite structure was studied. In addition, the effects of temperature, space velocity, and time on regeneration rate were investigated. The results suggested high temperature gas flow regeneration as an efficient regeneration process. The Co-Fe/sepiolite can be potentially applied for combined dye adsorption and degradation processes. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 445–451, 2015

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