Structure and properties of forming adsorbents prepared from different particle sizes of coal fly ash

doi:10.1016/j.cjche.2014.09.037

Abstract

Abstract: In this paper, different particle sizes of coal fly ash FA-R (D₅₀ = 15.75 μm), FA-A (D₅₀ = 3.61 μm) and FA-B (D₅₀= 1.73 μm) were treated with NaOH solution to prepare the forming adsorbents FFA-R, FFA-A and FFA-B. The structure and adsorption properties of the forming adsorbents for methylene blue (MB) from aqueous solution were examined. The results showed that the specific surface areas and adsorption capacities of the forming adsorbent for MB increased with decreasing particle size of raw coal fly ashes. The adsorption kinetic data of MB on FFA-R, FFA-A and FFA-B fitted the second-order kinetic model very well with the rate constants (k₂) of 3.15 × 10^-2, 3.84×10^-2 and 6.27 × 10^-2 g·mg^-1·min^-1, respectively. The adsorption processwas not only controlled by intra-particle diffusion. The isotherms of MB on FFA-R, FFA-A and FFA-B can be described by the Langmuir isotherm and the Freundlich isotherm, and the adsorption processes were spontaneous and exothermic.

Key words: Coal fly ash, Forming adsorbent, Particle size, Structure, Methylene blue

摘要： In this paper, different particle sizes of coal fly ash FA-R (D₅₀ = 15.75 μm), FA-A (D₅₀ = 3.61 μm) and FA-B (D₅₀= 1.73 μm) were treated with NaOH solution to prepare the forming adsorbents FFA-R, FFA-A and FFA-B. The structure and adsorption properties of the forming adsorbents for methylene blue (MB) from aqueous solution were examined. The results showed that the specific surface areas and adsorption capacities of the forming adsorbent for MB increased with decreasing particle size of raw coal fly ashes. The adsorption kinetic data of MB on FFA-R, FFA-A and FFA-B fitted the second-order kinetic model very well with the rate constants (k₂) of 3.15 × 10^-2, 3.84×10^-2 and 6.27 × 10^-2 g·mg^-1·min^-1, respectively. The adsorption processwas not only controlled by intra-particle diffusion. The isotherms of MB on FFA-R, FFA-A and FFA-B can be described by the Langmuir isotherm and the Freundlich isotherm, and the adsorption processes were spontaneous and exothermic.

关键词: Coal fly ash, Forming adsorbent, Particle size, Structure, Methylene blue

Zhuannian Liu, Yuan Liu. Structure and properties of forming adsorbents prepared from different particle sizes of coal fly ash[J]. Chin.J.Chem.Eng., 2015, 23(1): 290-295.

Zhuannian Liu, Yuan Liu. Structure and properties of forming adsorbents prepared from different particle sizes of coal fly ash[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 290-295.

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