Effect of pH and Calcium on the Adsorptive Removal of Cadmium and Copper by Iron Oxide–Coated Sand and Granular Ferric Hydroxide

Handle URI:
http://hdl.handle.net/10754/621796
Title:
Effect of pH and Calcium on the Adsorptive Removal of Cadmium and Copper by Iron Oxide–Coated Sand and Granular Ferric Hydroxide
Authors:
Uwamariya, V.; Petrusevski, B.; Lens, P. N. L.; Amy, Gary L.
Abstract:
Iron oxide-coated sand (IOCS) and granular ferric hydroxide (GFH) were used to study the effect of Ca2+ and pH on the adsorptive removal of Cu2+ and Cd2+ from groundwater using batch adsorption experiments and kinetic modeling. It was observed that Cu2+ and Cd2+ were not stable in synthetic waters. The extent of precipitation increased with increasing pH. Removal of Cu2+ and Cd2+ was achieved through both precipitation and adsorption, with IOCS showing higher adsorption efficiency. Increase of pH (from 6 to 8) resulted in a higher overall removal efficiency of both Cu2+ and Cd2+, with precipitation as predominant removal mechanisms at higher pH values, especially for Cu2+. An increase in Ca2+ concentration increased the precipitation of Cu2+ [as Cu2(OH)2CO3 and Cu3(OH)2(CO3)2] and Cd2+ [as Cd(OH)2 and CdCO3]. In addition, Ca2+ competes with Cu2+ and Cd2+ for surface adsorption sites on IOCS and GFH, and reduces their adsorption capacity. The kinetic modeling revealed that the adsorption of Cd2+ onto IOCS is a complex process, with limited contribution of chemisorption that increases in the presence of Ca2+. © 2015 American Society of Civil Engineers.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
Uwamariya V, Petrusevski B, Lens PNL, Amy GL (2016) Effect of pH and Calcium on the Adsorptive Removal of Cadmium and Copper by Iron Oxide–Coated Sand and Granular Ferric Hydroxide. Journal of Environmental Engineering 142: C4015015. Available: http://dx.doi.org/10.1061/(asce)ee.1943-7870.0001009.
Publisher:
American Society of Civil Engineers (ASCE)
Journal:
Journal of Environmental Engineering
Issue Date:
17-Aug-2015
DOI:
10.1061/(asce)ee.1943-7870.0001009
Type:
Article
ISSN:
0733-9372; 1943-7870
Sponsors:
The authors thank the Netherlands Government for providing financial assistance through the Netherlands Fellowship Program for the financial support under Grant No. 32000022.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorUwamariya, V.en
dc.contributor.authorPetrusevski, B.en
dc.contributor.authorLens, P. N. L.en
dc.contributor.authorAmy, Gary L.en
dc.date.accessioned2016-11-03T13:25:10Z-
dc.date.available2016-11-03T13:25:10Z-
dc.date.issued2015-08-17en
dc.identifier.citationUwamariya V, Petrusevski B, Lens PNL, Amy GL (2016) Effect of pH and Calcium on the Adsorptive Removal of Cadmium and Copper by Iron Oxide–Coated Sand and Granular Ferric Hydroxide. Journal of Environmental Engineering 142: C4015015. Available: http://dx.doi.org/10.1061/(asce)ee.1943-7870.0001009.en
dc.identifier.issn0733-9372en
dc.identifier.issn1943-7870en
dc.identifier.doi10.1061/(asce)ee.1943-7870.0001009en
dc.identifier.urihttp://hdl.handle.net/10754/621796-
dc.description.abstractIron oxide-coated sand (IOCS) and granular ferric hydroxide (GFH) were used to study the effect of Ca2+ and pH on the adsorptive removal of Cu2+ and Cd2+ from groundwater using batch adsorption experiments and kinetic modeling. It was observed that Cu2+ and Cd2+ were not stable in synthetic waters. The extent of precipitation increased with increasing pH. Removal of Cu2+ and Cd2+ was achieved through both precipitation and adsorption, with IOCS showing higher adsorption efficiency. Increase of pH (from 6 to 8) resulted in a higher overall removal efficiency of both Cu2+ and Cd2+, with precipitation as predominant removal mechanisms at higher pH values, especially for Cu2+. An increase in Ca2+ concentration increased the precipitation of Cu2+ [as Cu2(OH)2CO3 and Cu3(OH)2(CO3)2] and Cd2+ [as Cd(OH)2 and CdCO3]. In addition, Ca2+ competes with Cu2+ and Cd2+ for surface adsorption sites on IOCS and GFH, and reduces their adsorption capacity. The kinetic modeling revealed that the adsorption of Cd2+ onto IOCS is a complex process, with limited contribution of chemisorption that increases in the presence of Ca2+. © 2015 American Society of Civil Engineers.en
dc.description.sponsorshipThe authors thank the Netherlands Government for providing financial assistance through the Netherlands Fellowship Program for the financial support under Grant No. 32000022.en
dc.publisherAmerican Society of Civil Engineers (ASCE)en
dc.subjectAdsorptionen
dc.subjectCadmiumen
dc.subjectCalciumen
dc.subjectCopperen
dc.subjectGFHen
dc.subjectIOCSen
dc.titleEffect of pH and Calcium on the Adsorptive Removal of Cadmium and Copper by Iron Oxide–Coated Sand and Granular Ferric Hydroxideen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalJournal of Environmental Engineeringen
dc.contributor.institutionDept. of Chemistry, Univ. of Rwanda, P.O. Box 117, Huye, Rwandaen
dc.contributor.institutionUNESCO-IHE, P.O. Box 3015, DA Delft, Netherlandsen
kaust.authorAmy, Gary L.en
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