Preparation of Fly Ash/CeO2 Composite and its Adsorption Kinetics for Congo Red Dye from Aqueous Solution

Bei Gang Li; Lei Ding

doi:10.4028/www.scientific.net/MSF.814.458

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HomeMaterials Science ForumMaterials Science Forum Vol. 814Preparation of Fly Ash/CeO2 Composite and its...

Preparation of Fly Ash/CeO₂ Composite and its Adsorption Kinetics for Congo Red Dye from Aqueous Solution

Abstract:

Fly ash/CeO₂ composite (FA/CeO₂) was prepared by acid modification and precipitation method using a low-cost waste fly ash (FA) as a raw material and characterized by X-ray diffraction (XRD) and the BET surface analysis. The adsorption of FA and FA/CeO₂ for Congo Red (CR) from simulated dye wastewater was studied. The different regeneration methods for the CR-saturated FA/CeO₂ were investigated. The results show that the adsorption capacity and removal rate of CR on FA/CeO₂can respectively reach 175.35mg/g and 97.42%, 4.5 times higher than those on FA. The adsorption process of FA/CeO₂for CR at different temperatures (25°C~55°C) can well be described by the pseudo-second-order adsorption model and is mainly controlled by intraparticle diffusion. The adsorption rate decreased slightly with increasing temperature, and the obtained adsorption apparent activation energy is 15.08kJ/mol. This indicates that CR is easily adsorbed on FA/CeO₂_,and the adsorption of the process is mainly physical adsorption with exothermic nature. The room temperature is favorable to the adsorption and actual operation. NaOH solution of 0.01 mol/L can make CR-saturated FA/CeO₂ regenerated three times, and corresponding removal rate for CR can reach 97.82%, 80.21% and 66.04%, respectively. As a new kind of low-cost and high-efficient adsorbent, FA/CeO₂composite has the potential value in the application of wastewater treatment.

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Periodical:

Materials Science Forum (Volume 814)

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458-463

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.814.458

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Online since:

March 2015

Authors:

Bei Gang Li*, Lei Ding

Keywords:

Adsorption, Cerium Dioxide, Composite, Congo Red, Fly Ash

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