The Effective Removal of Congo Red Dye from Aqueous Solution Using Fly Ash/CeO₂ Composite Material

Abstract:

Fly ash/CeO₂ composite adsorbent (FA/CeO₂) was prepared by HCl treatment and precipitation method using a low-cost waste fly ash (FA) as the raw material and used for the removal of Congo Red (CR) from aqueous solution. Effects of important parameters such as contact time, initial dye concentration, pH value and temperature were explored. Adsorption equilibrium and isotherms were investigated. The adsorption of CR onto FA/CeO₂ is a fast process and to achieve a basic balance in 30 minutes. The removal of CR is strongly pH-dependent. FA/CeO₂ is an effective adsorbent for the CR removal with removal rate of 98.8% when initial CR concentration is 1000 mg/L. The experimental isotherm data were analyzed using Langmuir and Freundlich isotherm models. The results revealed that the adsorption behavior of CR on FA/CeO₂ fitted well with the Langmuir model at different temperatures. The maximum adsorption capacity obtained by Langmuir model is 232.56 mg/g which is nearly consistent with the actual adsorption value of 230.01 mg/g at 298K. The Adsorption amount decreases with increasing temperature, but the variation of the amplitude is very small.

• Periodical: Applied Mechanics and Materials (Volume 535)
• Pages: 671-674
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.535.671
• Online since: February 2014
• Authors: Lei Ding, Bei Gang Li, Jing Mi
• Keywords: Adsorption, Cerium Dioxide, Congo Red, Fly Ash (FA)

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