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

doi:10.1016/j.cjche.2014.09.037

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (1): 290-295.DOI: 10.1016/j.cjche.2014.09.037

• 能源、资源与环境技术 • 上一篇下一篇

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

Zhuannian Liu¹, Yuan Liu²

1 College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China;
2 School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China

收稿日期:2013-04-15 修回日期:2013-09-19 出版日期:2015-01-28 发布日期:2015-01-24
通讯作者: Zhuannian Liu
基金资助:
Supported by the National Natural Science Foundation of China (51278418) and the Natural Science Basic Research Plan in Shaanxi Province of China (2013K11-10).

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

Zhuannian Liu¹, Yuan Liu²

1 College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China;
2 School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China

Received:2013-04-15 Revised:2013-09-19 Online:2015-01-28 Published:2015-01-24
Contact: Zhuannian Liu
Supported by:
Supported by the National Natural Science Foundation of China (51278418) and the Natural Science Basic Research Plan in Shaanxi Province of China (2013K11-10).

摘要/Abstract

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

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

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.

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.

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

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

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