Investigation of the kinetics of vitamin B12 sorption by lanthanum-modified bentonite
Abstract
Methods: Bentonite was modified using a lanthanum nitrate solution (0.7 mg/cm³), followed by washing and drying. Sorption characteristics were studied using UV spectrophotometry (λ = 361 nm) and static sorption capacity calculations. Sorption kinetics were modeled using pseudo-first-order and pseudo-second-order equations.
Results: Lanthanum modification significantly enhanced the sorption capacity (up to 0.3579 μmol/g) and adsorption rate. Kinetic analysis indicated that the pseudo-second-order model accurately describes the adsorption process for both natural and modified samples. The chemisorption mechanism was supported by a high model adequacy (R² > 0.9999). Natural bentonite exhibited lower sorption capacity (0.1159 μmol/g) and adsorption rates. Purpose: To investigate the kinetics of vitamin B12 sorption on natural and lanthanum-modified bentonite and analyze the adsorption mechanism.
Conclusions: Lanthanum modification substantially improves the sorption efficiency of bentonite for vitamin B12. The enhanced sorbent is promising for biomedical and environmental applications due to its high selectivity and sorption capacity.
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References
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