Preparation of Fly Ash/Rare Earth Adsorbent and its Adsorption for Reactive Dye from Aqueous Solution

Abstract:

Lanthanum doped fly ash (La-FA) adsorbent was prepared using hydrothermal reaction method and applied to the removal of wool-used reactive red B (WRR B) dye from the aqueous solution. The preparation and adsorption conditions of the sorbent were investigated. The adsorption characteristics and mechanism were analyzed by X-ray diffraction (XRD) and discussed from kinetics viewpoint. The results show that: the removal rate of WRR B from the solution containing 150 mg/L at pH 6.0 by La-FA adsorbent, which obtained under the conditions of a certain ratio of mass to concentration of La³⁺ and stirring time of 6h at 60°C, is 94% with good adsorption effect when the contact time is 2.5h at temperature of 25°C. All sorption kinetic data at different temperature are found to be described by the pseudo-second order equation very well and the adsorption process is mainly controlled by intra-particle diffusion. The equilibrium adsorption amount (q_e) of the La-FA adsorbent for reactive dyes increased with increase in dye initial concentration and decreased with the rise of temperature. The adsorption activation energy obtained was 9.86kJ/mol. Combining with XRD analysis, the results indicate that the adsorption is mainly the physical sorption with exothermic nature. The room temperature is favorable to the adsorption and actual operation.

• Periodical: Materials Science Forum (Volumes 743-744)
• Pages: 409-413
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.743-744.409
• Online since: January 2013
• Authors: Chen Wang, Bei Gang Li, Jing Mi
• Keywords: Adsorption Properties, Fly Ash (FA), La³⁺, Wool-Used Reactive Red B

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