Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal

S. S. Mayakaduwa; Prasanna Kumarathilaka; Indika Herath; Mahtab Ahmad; Mohammed Al-Wabel; Yong Sik Ok; Adel Usman; Adel Abduljabbar; Meththika Vithanage

doi:10.1016/j.chemosphere.2015.07.080

Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal

S. S. Mayakaduwa, Prasanna Kumarathilaka, Indika Herath, Mahtab Ahmad, Mohammed Al-Wabel, Yong Sik Ok, Adel Usman, Adel Abduljabbar, Meththika Vithanage

Research output: Contribution to journal › Article › peer-review

154 Citations (Scopus)

Abstract

We investigated the removal of aqueous glyphosate using woody (dendro) biochar obtained as a waste by product from bioenergy industry. Equilibrium isotherms and kinetics data were obtained by adsorption experiments. Glyphosate adsorption was strongly pH dependent occurring maximum in the pH range of 5-6. The protonated amino moiety of the glyphosate molecule at this pH may interact with π electron rich biochar surface via π-π electron donor-acceptor interactions. Isotherm data were best fitted to the Freundlich and Temkin models indicating multilayer sorption of glyphosate. The maximum adsorption capacity of dendro biochar for glyphosate was determined by the isotherm modeling to be as 44 mg/g. Adsorption seemed to be quite fast, reaching the equilibrium <1 h. Pseudo-second order model was found to be the most effective in describing kinetics whereas the rate limiting step possibly be chemical adsorption involving valence forces through sharing or exchanging electrons between the adsorbent and sorbate. The FTIR spectral analysis indicated the involvement of functional groups such as phenolic, amine, carboxylic and phosphate in adsorption. Hence, a heterogeneous chemisorption process between adsorbate molecules and functional groups on biochar surface can be suggested as the mechanisms involved in glyphosate removal.

Original language	English
Pages (from-to)	2516-2521
Number of pages	6
Journal	Chemosphere
Volume	144
DOIs	https://doi.org/10.1016/j.chemosphere.2015.07.080
Publication status	Published - 2016 Feb 1
Externally published	Yes

Keywords

Adsorption capacity
Bioenergy
Chemisorption
Functional groups
Herbicide

ASJC Scopus subject areas

Public Health, Environmental and Occupational Health
Pollution
Chemistry(all)
Health, Toxicology and Mutagenesis
Environmental Engineering
Environmental Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.chemosphere.2015.07.080

Cite this

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title = "Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal",

abstract = "We investigated the removal of aqueous glyphosate using woody (dendro) biochar obtained as a waste by product from bioenergy industry. Equilibrium isotherms and kinetics data were obtained by adsorption experiments. Glyphosate adsorption was strongly pH dependent occurring maximum in the pH range of 5-6. The protonated amino moiety of the glyphosate molecule at this pH may interact with π electron rich biochar surface via π-π electron donor-acceptor interactions. Isotherm data were best fitted to the Freundlich and Temkin models indicating multilayer sorption of glyphosate. The maximum adsorption capacity of dendro biochar for glyphosate was determined by the isotherm modeling to be as 44 mg/g. Adsorption seemed to be quite fast, reaching the equilibrium <1 h. Pseudo-second order model was found to be the most effective in describing kinetics whereas the rate limiting step possibly be chemical adsorption involving valence forces through sharing or exchanging electrons between the adsorbent and sorbate. The FTIR spectral analysis indicated the involvement of functional groups such as phenolic, amine, carboxylic and phosphate in adsorption. Hence, a heterogeneous chemisorption process between adsorbate molecules and functional groups on biochar surface can be suggested as the mechanisms involved in glyphosate removal.",

keywords = "Adsorption capacity, Bioenergy, Chemisorption, Functional groups, Herbicide",

author = "Mayakaduwa, {S. S.} and Prasanna Kumarathilaka and Indika Herath and Mahtab Ahmad and Mohammed Al-Wabel and Ok, {Yong Sik} and Adel Usman and Adel Abduljabbar and Meththika Vithanage",

note = "Funding Information: The authors extend their appreciation to the Deanship of Scientific Research at King Saud University , Riyadh, Saudi Arabia for funding this work through the international research group project no IRG-14-02 . Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

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doi = "10.1016/j.chemosphere.2015.07.080",

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T1 - Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal

AU - Mayakaduwa, S. S.

AU - Kumarathilaka, Prasanna

AU - Herath, Indika

AU - Ahmad, Mahtab

AU - Al-Wabel, Mohammed

AU - Ok, Yong Sik

AU - Usman, Adel

AU - Abduljabbar, Adel

AU - Vithanage, Meththika

N1 - Funding Information: The authors extend their appreciation to the Deanship of Scientific Research at King Saud University , Riyadh, Saudi Arabia for funding this work through the international research group project no IRG-14-02 . Publisher Copyright: © 2015 Elsevier Ltd.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - We investigated the removal of aqueous glyphosate using woody (dendro) biochar obtained as a waste by product from bioenergy industry. Equilibrium isotherms and kinetics data were obtained by adsorption experiments. Glyphosate adsorption was strongly pH dependent occurring maximum in the pH range of 5-6. The protonated amino moiety of the glyphosate molecule at this pH may interact with π electron rich biochar surface via π-π electron donor-acceptor interactions. Isotherm data were best fitted to the Freundlich and Temkin models indicating multilayer sorption of glyphosate. The maximum adsorption capacity of dendro biochar for glyphosate was determined by the isotherm modeling to be as 44 mg/g. Adsorption seemed to be quite fast, reaching the equilibrium <1 h. Pseudo-second order model was found to be the most effective in describing kinetics whereas the rate limiting step possibly be chemical adsorption involving valence forces through sharing or exchanging electrons between the adsorbent and sorbate. The FTIR spectral analysis indicated the involvement of functional groups such as phenolic, amine, carboxylic and phosphate in adsorption. Hence, a heterogeneous chemisorption process between adsorbate molecules and functional groups on biochar surface can be suggested as the mechanisms involved in glyphosate removal.

AB - We investigated the removal of aqueous glyphosate using woody (dendro) biochar obtained as a waste by product from bioenergy industry. Equilibrium isotherms and kinetics data were obtained by adsorption experiments. Glyphosate adsorption was strongly pH dependent occurring maximum in the pH range of 5-6. The protonated amino moiety of the glyphosate molecule at this pH may interact with π electron rich biochar surface via π-π electron donor-acceptor interactions. Isotherm data were best fitted to the Freundlich and Temkin models indicating multilayer sorption of glyphosate. The maximum adsorption capacity of dendro biochar for glyphosate was determined by the isotherm modeling to be as 44 mg/g. Adsorption seemed to be quite fast, reaching the equilibrium <1 h. Pseudo-second order model was found to be the most effective in describing kinetics whereas the rate limiting step possibly be chemical adsorption involving valence forces through sharing or exchanging electrons between the adsorbent and sorbate. The FTIR spectral analysis indicated the involvement of functional groups such as phenolic, amine, carboxylic and phosphate in adsorption. Hence, a heterogeneous chemisorption process between adsorbate molecules and functional groups on biochar surface can be suggested as the mechanisms involved in glyphosate removal.

KW - Adsorption capacity

KW - Bioenergy

KW - Chemisorption

KW - Functional groups

KW - Herbicide

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SN - 0045-6535

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EP - 2521

JO - Chemosphere

JF - Chemosphere

ER -

Equilibrium and kinetic mechanisms of woody biochar on aqueous glyphosate removal

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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