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Removal of phosphate by Ivory Coast shale in a homogeneous reactor and under hydrodynamic conditions; influence of soluble species

D. E. Kpannieu, C. Ruby, L. Coulibaly, M. Abdelmoula and M. Mallet
Removal of phosphate by Ivory Coast shale in a homogeneous reactor and under hydrodynamic conditions; influence of soluble species
Clays and Clay Minerals (December 2018) 66 (6): 500-514

Abstract

Developing low cost and effective phosphate adsorbents is crucial to prevent eutrophication of natural waters. Here, phosphate removal by a natural and abundant shale from the Ivory Coast was investigated in both batch and column experiments with special attention devoted to understand the adsorption process. Batch experiments were carried out to assess the influence of initial phosphate concentration, sorbent dosage, contact time, and pH on phosphate removal. The phosphate removal efficiency increased with increased shale dosage while phosphate uptake decreased. Aqueous Ca, Mg, Al, and Fe species concentrations decreased in the presence of phosphate. Additionally, phosphate uptake strongly decreased with pH increases in the range 2-11, but then increased at pH 12. The kinetics were well described using a pseudo-second order model, and Langmuir adsorption isotherms were used for the equilibrium surface reactions. Adsorption to nanoparticles of goethite was hypothesized to be the major phosphate removal mechanism in the pH range 4-10. Column experiments with a flow rate of 1 mL min (super -1) and an initial phosphate concentration of 25 mg L (super -1) showed a breakthrough point at a V/Vp value of approximately 17, where V is the volume of phosphate solution added to the column and Vp is the pore volume. A V/Vp value of approximately 17 corresponded to a phosphate uptake of 0.17 mg/g, which was in agreement with the batch experiments. Column experiments revealed a strong correlation between the aqueous concentrations of Ca, Mg, Al, and Fe species and phosphate removal and, thus, suggest that phosphate removal by the shale occurred by aqueous dissolution/precipitation.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 66
Serial Issue: 6
Title: Removal of phosphate by Ivory Coast shale in a homogeneous reactor and under hydrodynamic conditions; influence of soluble species
Affiliation: Universite de Lorraine, Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, Villers-les-Nancy, France
Pages: 500-514
Published: 201812
Text Language: English
Publisher: Clay Minerals Society, Chantilly, VA, United States
References: 52
Accession Number: 2019-014649
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N04°19'60" - N10°40'00", W08°45'00" - W02°30'00"
Secondary Affiliation: Universite Nangui Abrogoua, CIV, Cote d'Ivoire
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201910
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