Enhancing the soil’s adsorption capacity for Pb and Cd: Reaction mechanism and stability

Xinyue Li; Ziao Zhao; Yan Jiang; Xiulan Ma; Hong Yao; Shan Jiang; Jiayang Song

doi:10.1016/j.indcrop.2026.123549

May 26, 2026Industrial Crops and ProductsOpen Access

Enhancing the soil’s adsorption capacity for Pb and Cd: Reaction mechanism and stability

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This research aims to improve understanding of how biochar enhances soil’s capacity to adsorb lead (Pb) and cadmium (Cd) even in complex contamination situations.
Evaluated the adsorption process of Pb and Cd using biochar in soil environments.
Assessed quasi-second-order kinetics and Langmuir adsorption isotherms to analyze metal removal effectiveness.
Investigated the passivation mechanism of Pb and Cd in soil after biochar treatment.
Biochar effectively removed Pb and Cd, even following co-aging with soil.
The adsorption kinetics followed a quasi-second-order model, indicating efficient metal binding.
Langmuir isotherm modeling confirmed that adsorption occurred in a consistent manner for both metals.

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Abstract

• Cd is at a disadvantage in binary metal contamination (Pb+Cd). • Biochar can still effectively remove Pb and Cd after co-aging with soil. • The quasi-second-order kinetics and Langmuir conform to the adsorption process. • Revealing the Pb and Cd passivation mechanism by biochar after co-aging with soil.

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Li et al. (2026) studied this question.

synapsesocial.com/papers/6a17db4d3fad632b0f9d8216 https://doi.org/10.1016/j.indcrop.2026.123549

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Enhancing the soil’s adsorption capacity for Pb and Cd: Reaction mechanism and stability

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Enhancing the soil’s adsorption capacity for Pb and Cd: Reaction mechanism and stability

Key Points

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