Removal of lead (Pb(II)) and zinc (Zn(II)) from aqueous solution using coal fly ash (CFA) as a dual-sites adsorbent

doi:10.1016/j.cjche.2020.08.046

Chinese Journal of Chemical Engineering ›› 2021, Vol. 34 ›› Issue (6): 289-298.DOI: 10.1016/j.cjche.2020.08.046

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Removal of lead (Pb(II)) and zinc (Zn(II)) from aqueous solution using coal fly ash (CFA) as a dual-sites adsorbent

Widi Astuti¹, Achmad Chafidz^2,3, Ahmed S. Al-Fatesh⁴, Anis H. Fakeeha⁴

1 Chemical Engineering Department, Universitas Negeri Semarang, Semarang 50229, Indonesia;
2 Chemical Engineering Department, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia;
3 Center for Material Science and Technology Studies, Chemical Engineering Department, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia;
4 Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia

Received:2020-04-07 Revised:2020-08-13 Online:2021-08-30 Published:2021-06-28
Contact: Achmad Chafidz
Supported by:
The authors would like to appreciate the Deanship of Scientific Research (DSR) at King Saud University (KSU), Saudi Arabia for financially supporting this research project (No. RG-1435-078).

Removal of lead (Pb(II)) and zinc (Zn(II)) from aqueous solution using coal fly ash (CFA) as a dual-sites adsorbent

Widi Astuti¹, Achmad Chafidz^2,3, Ahmed S. Al-Fatesh⁴, Anis H. Fakeeha⁴

1 Chemical Engineering Department, Universitas Negeri Semarang, Semarang 50229, Indonesia;
2 Chemical Engineering Department, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia;
3 Center for Material Science and Technology Studies, Chemical Engineering Department, Universitas Islam Indonesia, Yogyakarta 55584, Indonesia;
4 Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia

通讯作者: Achmad Chafidz
基金资助:
The authors would like to appreciate the Deanship of Scientific Research (DSR) at King Saud University (KSU), Saudi Arabia for financially supporting this research project (No. RG-1435-078).

Abstract

Abstract: Coal fly ash (CFA) is composed of minerals containing some oxides in crystalline phase (i.e., quartz and mullite), as well as unburned carbon as mesoporous material, thus enabling CFA to act as a dual-sites adsorbent with unique properties. This work focused on the adsorption of Pb(II) and Zn(II) from binary system, a mixture containing two metal ion solutions present simultaneously, onto NaOH-modified CFA (MCFA). Several adsorption tests were conducted to evaluate the effect of several parameters, including pH and contact times. The experiment results indicated that chemical treatment of CFA with NaOH increased pore volume from 0.021 to 0.223 cm³·g^-1. In addition, it could also enhance the availability of functional groups on both minerals and unburned carbon, resulting in almost 100% Pb(II) and 97% Zn(II) adsorbed. The optimum pH for adsorption system was pH = 3 and quasi-equilibrium occurred in 240 minutes. Equilibrium data from the experimental results were analyzed using Modified Extended Langmuir (MEL) and Competitive Adsorption Langmuir-Langmuir (CALL) isotherm models. The analysis results showed that the CALL isotherm model could better describe the Pb(II) and Zn(II) adsorption process onto MCFA in binary system compared with MEL isotherm model.

Key words: Modified coal fly ash, Adsorption, Dual-sites adsorbent, Pb(II), Zn(II), Aqueous solution

摘要： Coal fly ash (CFA) is composed of minerals containing some oxides in crystalline phase (i.e., quartz and mullite), as well as unburned carbon as mesoporous material, thus enabling CFA to act as a dual-sites adsorbent with unique properties. This work focused on the adsorption of Pb(II) and Zn(II) from binary system, a mixture containing two metal ion solutions present simultaneously, onto NaOH-modified CFA (MCFA). Several adsorption tests were conducted to evaluate the effect of several parameters, including pH and contact times. The experiment results indicated that chemical treatment of CFA with NaOH increased pore volume from 0.021 to 0.223 cm³·g^-1. In addition, it could also enhance the availability of functional groups on both minerals and unburned carbon, resulting in almost 100% Pb(II) and 97% Zn(II) adsorbed. The optimum pH for adsorption system was pH = 3 and quasi-equilibrium occurred in 240 minutes. Equilibrium data from the experimental results were analyzed using Modified Extended Langmuir (MEL) and Competitive Adsorption Langmuir-Langmuir (CALL) isotherm models. The analysis results showed that the CALL isotherm model could better describe the Pb(II) and Zn(II) adsorption process onto MCFA in binary system compared with MEL isotherm model.

关键词: Modified coal fly ash, Adsorption, Dual-sites adsorbent, Pb(II), Zn(II), Aqueous solution

Widi Astuti, Achmad Chafidz, Ahmed S. Al-Fatesh, Anis H. Fakeeha. Removal of lead (Pb(II)) and zinc (Zn(II)) from aqueous solution using coal fly ash (CFA) as a dual-sites adsorbent[J]. Chinese Journal of Chemical Engineering, 2021, 34(6): 289-298.

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Removal of lead (Pb(II)) and zinc (Zn(II)) from aqueous solution using coal fly ash (CFA) as a dual-sites adsorbent

Removal of lead (Pb(II)) and zinc (Zn(II)) from aqueous solution using coal fly ash (CFA) as a dual-sites adsorbent

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