Kinetic modeling of molybdenum sorption and transport in soils
- 1 April 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Environmental Science and Pollution Research
- Vol. 27 (16), 20227-20234
- https://doi.org/10.1007/s11356-020-08546-1
Abstract
In this investigation, batch and column experiments were conducted to investigate the molybdenum (Mo) sorption and transport processes on a neutral-pH soil (Webster loam) and an acidic soil (Mahan sand) in Ca2+ and K+ background solutions. Batch results showed that the adsorption of Mo was strongly non-linear in both soils and amount of Mo sorbed in the acidic soil was larger than the neutral soil. The Freundlich distribution coefficients (Kf) and Langmuir sorption maxima (Smax) in Ca2+ background solution are larger than that in K+ solution, indicating greater Mo sorption in Ca2+ than in K+. Experimental breakthrough curves (BTCs) demonstrated that mobility of Mo was higher at neutral condition than that at acidic condition. A multi-reaction transport model (MRTM) formulation with two kinetic retention reactions (reversible and irreversible) well described Mo transport for Webster soil. However, MRTM model which accounts for equilibrium and kinetic sites is recommended for Mo transport in Mahan soil, reflecting different soil properties. Based on inverse modeling, the sorption forward rate coefficients (k1) obtained from Ca2+ in both soils are larger than that from K+, which consistent with batch experiment. Overall, MRTM model was capable of describing the Mo transport behavior under different geochemical conditions.Keywords
Funding Information
- Agricultural Center, Louisiana State University (94074)
This publication has 27 references indexed in Scilit:
- A modified Langmuir-Freundlich isotherm model for simulating pH-dependent adsorption effectsJournal of Contaminant Hydrology, 2012
- X-ray Absorption Spectroscopic Investigation of Molybdenum Multinuclear Sorption Mechanism at the Goethite−Water InterfaceEnvironmental Science & Technology, 2010
- Transport of molybdenum in a biosolid-amended alkaline soilChemosphere, 2006
- FACTORS AFFECTING MOLYBDENUM ADSORPTION BY SOILS AND MINERALSSoil Science, 1998
- Molybdenum Adsorption on Oxides, Clay Minerals, and SoilsSoil Science Society of America Journal, 1996
- DIFFERENTIAL ADSORPTION OF TRACE METALS BY SOILS AS INFLUENCED BY EXCHANGEABLE CATIONS AND IONIC STRENGTHSoil Science, 1993
- Modeling the Transport and Retention of Cadmium in Soils: Multireaction and Multicomponent ApproachesSoil Science Society of America Journal, 1992
- Calcium molybdate solubility in spent oil shale and a preliminary evaluation of the association constants for the formation of CaMoO40(aq), KMoO4-(aq), and NaMoO4-(aq)Environmental Science & Technology, 1990
- Kinetics and Mechanisms of Molybdate Adsorption/Desorption at the Goethite/Water Interface Using Pressure‐Jump RelaxationSoil Science Society of America Journal, 1989
- SYMPTOMS OF MOLYBDENUM DEFICIENCY IN PLANTSSoil Science, 1956