Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent for removal of Cr(VI) from water

doi:10.1007/s11705-020-1926-9

Front. Chem. Sci. Eng.

2021, Vol. 15

Issue (3) : 518-527 https://doi.org/10.1007/s11705-020-1926-9

RESEARCH ARTICLE

Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent for removal of Cr(VI) from water

Yixin Zhang^1,³, Lu Zhou², Liqing Chen², Yang Guo², Fanhui Guo², Jianjun Wu²(

), Baiqian Dai⁴(

)

¹. National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China
². School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
³. School of Chemistry, Monash University, Victoria 3800, Australia
⁴. Department of Chemical Engineering, Monash University, Victoria 3800, Australia

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Abstract

The coal fly ash produced by gasification is estimated to be over 80 million ton per year in China by 2021. It has mainly been disposed as solid waste by landfill. There is lack of study focused on its utilization. In this paper, the coal fly ash produced by gasification was at first analyzed and then applied to synthesize zeolite as an adsorbent. The effects of synthesis conditions on the cation exchange capacity (CEC) of zeolite were investigated. The results from X-ray diffraction and scanning electron microscope indicated that the crystallinity of the synthesized zeolite is the most important factor to affect the CEC. When the synthesized zeolite with the highest CEC (275.5 meq/100 g) was used for the adsorption of Cr(VI) from aqueous solution, the maximum adsorption capacity for Cr(VI) was found to be 17.924 mg/g. The effects of pH, contact time and initial concentration on the adsorption of Cr(VI) were also investigated. The adsorption kinetics and isotherms can be well described by the pseudo-second-order model and Langmuir isotherm model, respectively.

Keywords coal fly ash gasification zeolite Na-P1 chromium(VI)

Corresponding Author(s): Jianjun Wu,Baiqian Dai

Just Accepted Date: 13 April 2020 Online First Date: 28 May 2020 Issue Date: 10 May 2021

Cite this article:

Yixin Zhang,Lu Zhou,Liqing Chen, et al. Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent for removal of Cr(VI) from water[J]. Front. Chem. Sci. Eng., 2021, 15(3): 518-527.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-020-1926-9
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I3/518

Tab.1 The major chemical compounds in the coal fly ash produced by gasification process (wt-%, dry basis)

Fig.1 The XRD pattern of the coal fly ash produced by gasification (Q-quartz, M-mullite).

Fig.2 SEM of the coal fly ash produced by gasification.

Fig.3 The particle size distribution of the coal fly ash produced by gasification.

Fig.4 Effect of operation conditions on the CEC of synthesized zeolite: Three of four conditions (NaOH/coal fly ash ratio 1.1, alkali fusion temperature 550°C, hydrothermal treatment temperature 100°C, and hydrothermal treatment time 12 h) is kept constant while changing (a) NaOH/coal fly ash ratio, (b) alkali fusion temperature, (c) hydrothermal treatment temperature, and (d) hydrothermal treatment time.

Fig.5 The XRD patterns of synthesized zeolite with different CECs (P: zeolite Na-P1).

Fig.6 The SEM images of synthesized zeolite with different CEC. (a) CEC= 89.0 mmol/100 g, (b) CEC= 146.5 mmol/100 g, (c) CEC= 178.1 mmol/100 g, (d) CEC= 219.6 mmol/100 g, (e) CEC= 254.3 mmol/100 g, (f) CEC= 275.5 mmol/100 g.

Fig.7 Effect of pH on the adsorption of Cr(VI) (initial Cr(VI) concentration 100 mg/L, adsorbent dose 5 g/L, and contact time 120 min).

Fig.8 Effect of contact time on the adsorption of Cr(VI) with different initial concentration (pH 3, adsorbent dose 5 g/L).

Fig.9 Pseudo-second order model plots for the adsorption of Cr(VI) with different initial concentration (pH 3, adsorbent dose 5 g/L).

Initial concentration /(mg·L^?1)	$R 2$	$k$	$q e$ /(mg·L^?1)
20	0.999	0.122	3.764
50	0.999	0.025	9.151
70	0.999	0.014	12.309
100	0.999	0.020	15.482
150	0.999	0.011	16.829

Tab.2 The constants and correlation coefficients of pseudo-second order model plots for the adsorption of Cr(VI) with different initial concentration.

Fig.10 Effect of initial Cr(VI) concentration on the adsorption of Cr(VI) by synthesized zeolite (adsorbent dose 5 g/L, contact time 120 min, pH 3).

Fig.11 Langmuir isotherm plots for the adsorption of Cr(VI) (pH 3, contact time 120 min, adsorbent dose 5 g/L).

Fig.12 Freundlich isotherm plots for the adsorption of Cr(VI) (adsorbent dose 5 g/L, contact time 120 min, pH 3).

Langmuir constants				Freundlich constants
b	q_max/(mg·g⁻¹)	$R 2$		$K f$	n	$R 2$
0.515	17.924	0.999		4.470	3.562	0.888

Tab.3 The constants and correlation coefficients of Langmuir and Freundlich isotherm plots for the adsorption of Cr(VI)

Tab.4 A comparison of the adsorption capacity for Cr(VI) between the synthesized zeolite in this study and some other low-cost adsorbents with different raw material

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