Sorption properties of polymer-modified bentonite to Pb(Ⅱ) ions

JIANG Lusha; PU Hefu; MIN Ming; QIU Jinwei; CHEN Xiaoxiong

doi:10.11779/CJGE2024S20018

Volume 46 Issue S2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S2): 54-59. > DOI: 10.11779/CJGE2024S20018

JIANG Lusha, PU Hefu, MIN Ming, QIU Jinwei, CHEN Xiaoxiong. Sorption properties of polymer-modified bentonite to Pb(Ⅱ) ions[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 54-59. DOI: 10.11779/CJGE2024S20018

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Sorption properties of polymer-modified bentonite to Pb(Ⅱ) ions

1.
School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
3.
Key Laboratory of Geotechnical Mechanics & Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China

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Received Date: June 20, 2024

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Abstract

Abstract

To investigate the heavy metal sorption properties of the polymer-modified bentonite (PMB), the batch sorption tests are conducted. The sorption behaviors of the sodium activated calcium-bentonite (NCB) and PMB to Pb(Ⅱ) ions are investigated using four sorption kinetic models (i.e., pseudo-first-order, pseudo-second-order, intra-particle diffusion, and Elovich models) and four isothermal sorption models (i.e., Langmuir, Freundlich, D-R, and Temkin models). Additionally, the specific surface area and pore size distribution of the bentonites are analyzed the through BET (Brunauer-Emmett-Teller) tests. The results indicate that at solution pH = 1 (strong acidity), the sorption efficiency of the PMB to Pb(Ⅱ) ions is 60%, with an improvement of 33% over the NCB. The sorption kinetics of bentonites to Pb(Ⅱ) ions conformes more closely to the pseudo-second-order model, with the PMB rapidly adsorbing Pb(Ⅱ) ions within the first 5 minutes, achieving the sorption rate of 50%. The Langmuir sorption isotherm model provides a better description of the sorption characteristics of both bentonites to Pb(Ⅱ) ions, and the calculated maximum sorption capacity closely matches the testing results.
- bentonite,
- polymer modification,
- sorption property,
- Pb(Ⅱ) ion

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