Effective adsorption of Pb(II) ion from aqueous solution onto ZSM-5 zeolite synthesized from Vietnamese bentonite clay

Springer Science and Business Media LLC - Tập 195 - Trang 1-20 - 2023
Ngoc-An Nguyen1, Duy-Khoi Nguyen2,3,4, Van-Phuc Dinh1, Bich-Ngoc Duong1,3, Loc Ton-That2,4, Nguyen Trong Hung5, Thien-Hoang Ho6
1Institute of Interdisciplinary Social Sciences, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
2Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City, Vietnam
3Nuclear Training Center, Vietnam Atomic Energy Institute, Ha Noi, Vietnam
4Faculty of Natural Sciences, Duy Tan University, Da Nang City, Vietnam
5Graduate Institute for Technology of Radioactive and Rare Elements, Ha Noi, Vietnam
6Dong Nai University, Dong Nai, Vietnam

Tóm tắt

ZSM-5 zeolite was successfully synthesized from bentonite clay sourced from Lam Dong Province, Vietnam, using the hydrothermal method at 170 °C for 18 h. The synthesized ZSM-5 (SiO2/Al2O3 ratio ~ 34) exhibited a single phase with high crystallinity (91.8%), and a clear and uniform shape. In a detailed examination of the synthesized material’s Pb(II) adsorptive capacity, various factors were taken into account, including pH, interaction time, ionic strength, and the amount of adsorbent. Isotherms and kinetics were examined to elucidate the uptake behavior. Study results suggested that Pb(II) ion uptake by ZSM-5 was most appropriately described by the Sips isotherm and intraparticle diffusion kinetic models. The calculated maximum monolayer adsorption capacity according to the Langmuir isotherm model was 48.36 mg/g. Furthermore, the adsorption mechanisms of Pb(II) on ZSM-5 involving electrostatic interactions, ion exchange, and diffusion into pores were demonstrated using the analytical techniques before and after Pb(II) adsorption. These findings demonstrate that ZSM-5 synthesized from bentonite clay exhibits an excellent adsorption capacity for Pb(II), resulting in promising applications for treating drinking water or aqueous industrial waste containing Pb(II) ions.

Tài liệu tham khảo

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