Adsorption-desorption and co-migration of vanadium on colloidal kaolinite

Vanadium (V) pollution in soil has been widely noted, while knowledge about the effect of soil colloid on migration of V is scarce. Batch adsorption-desorption and transportation of the colloid-adsorbed V in columns packed with quartz sand under various environment conditions were carried out to exp...

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Bibliographic Details
Published in:Environmental science and pollution research international 2020-05, Vol.27 (15), p.17910-17922
Main Authors: Yang, Jin-yan, Luo, Hou-qiao, Zhu, Yan-yuan, Yu, Ya-qi, He, Wen-yan, Wu, Zhen-zhong, Wang, Bin
Format: Article
Language:English
Subjects:
Adsorption
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Colloiding
Desorption
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Flow velocity
Groundwater
Kaolinite
pH effects
Porous media
Research Article
Sand
Soil pollution
Soil profiles
Soil properties
Soils
Transportation
Vanadium
Waste Water Technology
Water Management
Water Pollution Control
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Summary:Vanadium (V) pollution in soil has been widely noted, while knowledge about the effect of soil colloid on migration of V is scarce. Batch adsorption-desorption and transportation of the colloid-adsorbed V in columns packed with quartz sand under various environment conditions were carried out to explore the retention and transportation of V by colloidal kaolinite. Batch adsorption-desorption studies show that the adsorption of V by the colloidal kaolinite was mainly specific adsorption and redox played a limited role in the adsorption process. The maximum adsorption capacity of the colloidal kaolinite was 712.4 mg g −1 , and about 5.9–8.7% of the adsorbed V could be desorbed. Both the adsorption-desorption and migration of V with colloidal kaolinite were highly ambient condition dependent. The column studies show that V was highly mobile in the saturated porous media. An easier transfer of V with an increase in pH, IS, and velocity of flow was noted. However, the increase of IS lead to the blockage of the colloidal kaolinite transportation. The recovery rate of the colloidal kaolinite at pH 7 and 9 was 2.0 and 2.1 times that at pH 5, respectively. The migration of colloidal-adsorbed V in sand column preceded that of V ion, but more colloidal-bound V than V ion remained in the column. Lack of consideration of the combination and co-transportation of V and colloidal kaolinite will lead to an overestimation of the risk of V to deeper soil profiles and groundwater. Graphical abstract
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-020-07845-x