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Agricultural wastes from wheat, barley, flax and grape for the efficient removal of Cd from contaminated water

Agricultural wastes from wheat, barley, flax and grape for the efficient removal of Cd from contaminated water
Agricultural wastes from wheat, barley, flax and grape for the efficient removal of Cd from contaminated water
Agricultural production results in wastes that can be re-used to improve the quality of the environment. This work has investigated for the first time the use of abundant, un-modified agricultural wastes and by-products (AWBs) from grape, wheat, barley and flax production, to reduce the concentration of Cd, a highly toxic and mobile heavy metal, in contaminated water. At concentrations of 1.1 mg Cd per L, flax and grape waste were found superior in removing Cd compared with a granular activated carbon used in water treatment, which is both more expensive and entails greater CO2 emissions in its production. At a pH representative of mine effluents, where Cd presents its greatest mobility and risk as a pollutant, grape and flax waste showed capacity for effective bulk water treatment due to rapid removal kinetics and moderate adsorption properties: reaching equilibrium within 183 and 8 min – adsorption capacities were determined as 3.99 and 3.36 mg Cd per g, respectively. The capacity to clean contaminated effluents was not correlated with the surface area of the biosorbents. Surface chemistry analysis indicated that Cd removal is associated with exchange with Ca, and chemisorption involving CdCO3, CdS and CdO groups. This work indicates that some AWBs can be directly (i.e. without pre-treatment or modification) used in bulk to remediate effluents contaminated with heavy metals, without requiring further cost or energy input, making them potentially suitable for low-cost treatment of persistent (e.g. via mine drainage) or acute (e.g. spillages) discharges in rural and other areas.
2046-2069
40378-40386
Melia, Patrick M.
be45abd6-6cb7-40c5-b0fe-6c74b5b9cc24
Busquets, Rosa
d3f8511d-c34e-4bf7-956c-19e4c1c5949f
Ray, Santanu
1a09c895-d9b2-472e-a358-ecbafb2cdf0e
Cundy, Andrew B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Melia, Patrick M.
be45abd6-6cb7-40c5-b0fe-6c74b5b9cc24
Busquets, Rosa
d3f8511d-c34e-4bf7-956c-19e4c1c5949f
Ray, Santanu
1a09c895-d9b2-472e-a358-ecbafb2cdf0e
Cundy, Andrew B.
994fdc96-2dce-40f4-b74b-dc638286eb08

Melia, Patrick M., Busquets, Rosa, Ray, Santanu and Cundy, Andrew B. (2018) Agricultural wastes from wheat, barley, flax and grape for the efficient removal of Cd from contaminated water. RSC Advances, 8 (70), 40378-40386. (doi:10.1039/C8RA07877G).

Record type: Article

Abstract

Agricultural production results in wastes that can be re-used to improve the quality of the environment. This work has investigated for the first time the use of abundant, un-modified agricultural wastes and by-products (AWBs) from grape, wheat, barley and flax production, to reduce the concentration of Cd, a highly toxic and mobile heavy metal, in contaminated water. At concentrations of 1.1 mg Cd per L, flax and grape waste were found superior in removing Cd compared with a granular activated carbon used in water treatment, which is both more expensive and entails greater CO2 emissions in its production. At a pH representative of mine effluents, where Cd presents its greatest mobility and risk as a pollutant, grape and flax waste showed capacity for effective bulk water treatment due to rapid removal kinetics and moderate adsorption properties: reaching equilibrium within 183 and 8 min – adsorption capacities were determined as 3.99 and 3.36 mg Cd per g, respectively. The capacity to clean contaminated effluents was not correlated with the surface area of the biosorbents. Surface chemistry analysis indicated that Cd removal is associated with exchange with Ca, and chemisorption involving CdCO3, CdS and CdO groups. This work indicates that some AWBs can be directly (i.e. without pre-treatment or modification) used in bulk to remediate effluents contaminated with heavy metals, without requiring further cost or energy input, making them potentially suitable for low-cost treatment of persistent (e.g. via mine drainage) or acute (e.g. spillages) discharges in rural and other areas.

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Accepted/In Press date: 26 November 2018
e-pub ahead of print date: 4 December 2018

Identifiers

Local EPrints ID: 426741
URI: http://eprints.soton.ac.uk/id/eprint/426741
ISSN: 2046-2069
PURE UUID: b155e8a0-966f-4e1d-b905-c21876ec4b43
ORCID for Andrew B. Cundy: ORCID iD orcid.org/0000-0003-4368-2569

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Date deposited: 11 Dec 2018 17:30
Last modified: 07 Oct 2020 02:07

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