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Characteristic of adsorption, desorption, and co-transport of vanadium on humic acid colloid.

Abstract：

:Understanding the interactions between humic acid colloid (HAC) and vanadium (V) in soils is of great importance in forecasting the behaviors and fates of V in the soil and groundwater systems. This study investigated the characteristics and factors that affect V adsorption-desorption by the HAC; meanwhile, we also explored the co-transport of the HAC and V in a saturated porous media. Scanning Electronic Microscopy micrographs showed the variation of morphological features on the surface of the HAC before and after V adsorption. Fourier transform infrared spectroscopy spectra revealed that the presence of hydroxyl, carboxyl, carbonyl, carbon-carbon double bond, amino, and aromatic ring on the HAC participated in V adsorption. The adsorption isotherms were well described by the Langmuir model, and the adsorption kinetics of the HAC was better described by the pseudo-first-order kinetic models. The adsorption-desorption was strongly dependent on the initial V concentration, solution pH, and temperature. The maximum adsorption amount was 861.17 mg g-1 by 200 mg L-1 HAC at the initial V concentration of 500 mg L-1, and the corresponding desorption amount was 15.13 mg g-1. These results showed that the HAC had high fixation capacity of V in soil. In addition, the HAC sped up the mobility of V; however, it decreased mass of migration of V in the saturated quartz sand column. These results are expected to provide insight into the potential impact of HAC on geochemical behaviours of V in vulnerable ecosystems.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Chen L,Zhu YY,Luo HQ,Yang JY

doi

10.1016/j.ecoenv.2019.110087

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

110087

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(19)31418-6

journal_volume

190

pub_type

杂志文章

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