Preparation of Acid-alkali Modified Coal Fly Ash Adsorbent and Its Removal Performance on Dyes

doi:10.11901/1005.3093.2023.238

Chinese Journal of Materials Research

2024, Vol. 38

Issue (5): 379-389 DOI: 10.11901/1005.3093.2023.238

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Preparation of Acid-alkali Modified Coal Fly Ash Adsorbent and Its Removal Performance on Dyes

WANG Yan¹, ZHANG Hao², CHANG Na³, WANG Haitao¹(

)

^1.School of Environmental Science and Engineering, TianGong University, Tianjin 300387, China
^2.School of Textile Science and Engineering, TianGong University, Tianjin 300387, China
^3.School of Chemical Engineering and Technology, TianGong University, Tianjin 300387, China

Cite this article:

WANG Yan, ZHANG Hao, CHANG Na, WANG Haitao. Preparation of Acid-alkali Modified Coal Fly Ash Adsorbent and Its Removal Performance on Dyes. Chinese Journal of Materials Research, 2024, 38(5): 379-389.

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Abstract

Coal fly ash (CFA) was modified with HCl and NaOH solutions as to produce a novel modified porous adsorbent (MCFA). The CFA and MCFA were characterized by SEM、BET、FT-IR、XRD、XPS. Meanwhile, simulated wastewaters containing dyes, such as basic violet, basic green, Congo red, and methyl violet, respectively were prepared, then the effect of the MCFA dosage on the adsorption capacity for dyes, and the effect of pH value of wastewaters on adsorption capacity for dyes were examined. The characterization results showed that the surface of MCFA is rather rough and porous, with a specific surface area of 32.0 m²/g, superior to 5.2 m²/g of the original CFA, accordingly its adsorption performance may be enhanced due to the increasing active and adsorptive sites on the surface. The MCFA has excellent adsorption effect on the desired four dyes. The maximum removal efficiency of basic violet and basic green all reached 99%, respectively by using adsorbent dosage of 2 mL for a given dye solution of 100 mg/L. By fitting data with isothermal adsorption and kinetic models, it follows that Freundlich isotherm model was fitted for the adsorption process, and both physical and chemical adsorption are involved in the adsorption process. The adsorption behavior of all four dyes could be described better by pseudo-second-order kinetics rather than pseudo-first-order kinetics, and the adsorption effect was significant, which can be used as an excellent adsorbent in the treatment industry of dye wastewaters.

Key words: inorganic non-metallic materials modification of coal fly ash dye wastewater decolorization adsorption

Received: 23 April 2023

ZTFLH:

O647.33

Fund: National Key Research and Development Program of China(2023YFE0101000)

Corresponding Authors: WANG Haitao, Tel: (022)83955622, E-mail: wanghaitao@tiangong.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.238 OR https://www.cjmr.org/EN/Y2024/V38/I5/379

Fig.1 Preparation process of fly ash adsorption material modified by HCl-NaOH method

Table 1 Basic information about adsorbed dyes

Fig.2 SEM images of CFA (a, b) and MCFA (c, d)

Fig.3 Pore size distribution and nitrogen adsorption desorption curves of CFA and MCFA samples

Table 2 Specific surface area and pore size parameters of CFA and MCFA

Fig.4 IR spectrum of CFA and MCFA

Fig.5 X-ray diffraction spectra of CFA and MCFA

Fig.6 XPS spectra of CFA and MCFA

Fig.7 XPS spectrum of CFA

Fig.8 XPS spectrum of MCFA

Fig.9 Adsorption properties of dyes with different doses of MCFA

Fig.10 Influence of concentrations on the adsorption effect of four dyes

Table 3 Isothermal fitting parameters of MCFA adsorption of four dyes

Fig.11 Influence of time on adsorption effect of four dyes

Table 4 Kinetic fitting parameters of adsorption of four dyes by MCFA

Fig.12 Adsorption capacity of MCFA for four dyes at pH 3~11

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