Adsorption of mono- and di-butyltin by a wheat charcoal: pH effects and modeling

Liping Fang; Ole K. Borggaard; Jan H. Christensen; Peter Engelund Holm; Hans Chr. Bruun Hansen

doi:10.1016/j.chemosphere.2012.05.010

Adsorption of mono- and di-butyltin by a wheat charcoal: pH effects and modeling

Liping Fang, Ole K. Borggaard, Jan H. Christensen, Peter Engelund Holm, Hans Chr. Bruun Hansen

4 Citations (Scopus)

Abstract

Understanding adsorption processes of butyltins (BTs) such as monobutyltin (MBT) and dibutyltin (DBT) by black carbons is important for the evaluation of BT exposure risks to organisms and humans. However, relevant knowledge is scarce. In this study, the acidity constants pK_a,1=2.3, pK_a,2=3.5 and pK_a,3=5.9 for MBT and pK_a,1=3.0 and pK_a,2=5.1 for DBT are estimated via potentiometric titration. Additionally, adsorption isotherms of BTs to a wheat charcoal were determined. The adsorption behavior was observed to be pH-dependent due to BT speciation and the pH-dependent surface charge of the charcoal. MBT adsorption to the charcoal decreases with increasing pH from 4 to 8, while the highest adsorption occurs at pH 6 for DBT. Adsorption of the BTs is successfully described in the pH range of 3-10 by using a newly developed pH-dependent Dual Langmuir model. The model has the potential to predict the interaction of BT species with charcoal, which can contribute to the risk assessments of BTs in the environment.

Original language	English
Journal	Chemosphere
Volume	89
Issue number	7
Pages (from-to)	863-868
Number of pages	6
ISSN	0045-6535
DOIs	https://doi.org/10.1016/j.chemosphere.2012.05.010
Publication status	Published - Oct 2012

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10.1016/j.chemosphere.2012.05.010

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@article{0fef2de5fe464701a4e4471111f7b4f9,

title = "Adsorption of mono- and di-butyltin by a wheat charcoal: pH effects and modeling",

abstract = "Understanding adsorption processes of butyltins (BTs) such as monobutyltin (MBT) and dibutyltin (DBT) by black carbons is important for the evaluation of BT exposure risks to organisms and humans. However, relevant knowledge is scarce. In this study, the acidity constants pKa,1=2.3, pKa,2=3.5 and pKa,3=5.9 for MBT and pKa,1=3.0 and pKa,2=5.1 for DBT are estimated via potentiometric titration. Additionally, adsorption isotherms of BTs to a wheat charcoal were determined. The adsorption behavior was observed to be pH-dependent due to BT speciation and the pH-dependent surface charge of the charcoal. MBT adsorption to the charcoal decreases with increasing pH from 4 to 8, while the highest adsorption occurs at pH 6 for DBT. Adsorption of the BTs is successfully described in the pH range of 3-10 by using a newly developed pH-dependent Dual Langmuir model. The model has the potential to predict the interaction of BT species with charcoal, which can contribute to the risk assessments of BTs in the environment.",

author = "Liping Fang and Borggaard, {Ole K.} and Christensen, {Jan H.} and Holm, {Peter Engelund} and Hansen, {Hans Chr. Bruun}",

year = "2012",

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doi = "10.1016/j.chemosphere.2012.05.010",

language = "English",

volume = "89",

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journal = "Chemosphere",

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TY - JOUR

T1 - Adsorption of mono- and di-butyltin by a wheat charcoal

T2 - pH effects and modeling

AU - Fang, Liping

AU - Borggaard, Ole K.

AU - Christensen, Jan H.

AU - Holm, Peter Engelund

AU - Hansen, Hans Chr. Bruun

PY - 2012/10

Y1 - 2012/10

N2 - Understanding adsorption processes of butyltins (BTs) such as monobutyltin (MBT) and dibutyltin (DBT) by black carbons is important for the evaluation of BT exposure risks to organisms and humans. However, relevant knowledge is scarce. In this study, the acidity constants pKa,1=2.3, pKa,2=3.5 and pKa,3=5.9 for MBT and pKa,1=3.0 and pKa,2=5.1 for DBT are estimated via potentiometric titration. Additionally, adsorption isotherms of BTs to a wheat charcoal were determined. The adsorption behavior was observed to be pH-dependent due to BT speciation and the pH-dependent surface charge of the charcoal. MBT adsorption to the charcoal decreases with increasing pH from 4 to 8, while the highest adsorption occurs at pH 6 for DBT. Adsorption of the BTs is successfully described in the pH range of 3-10 by using a newly developed pH-dependent Dual Langmuir model. The model has the potential to predict the interaction of BT species with charcoal, which can contribute to the risk assessments of BTs in the environment.

AB - Understanding adsorption processes of butyltins (BTs) such as monobutyltin (MBT) and dibutyltin (DBT) by black carbons is important for the evaluation of BT exposure risks to organisms and humans. However, relevant knowledge is scarce. In this study, the acidity constants pKa,1=2.3, pKa,2=3.5 and pKa,3=5.9 for MBT and pKa,1=3.0 and pKa,2=5.1 for DBT are estimated via potentiometric titration. Additionally, adsorption isotherms of BTs to a wheat charcoal were determined. The adsorption behavior was observed to be pH-dependent due to BT speciation and the pH-dependent surface charge of the charcoal. MBT adsorption to the charcoal decreases with increasing pH from 4 to 8, while the highest adsorption occurs at pH 6 for DBT. Adsorption of the BTs is successfully described in the pH range of 3-10 by using a newly developed pH-dependent Dual Langmuir model. The model has the potential to predict the interaction of BT species with charcoal, which can contribute to the risk assessments of BTs in the environment.

U2 - 10.1016/j.chemosphere.2012.05.010

DO - 10.1016/j.chemosphere.2012.05.010

M3 - Journal article

C2 - 22664389

SN - 0045-6535

VL - 89

SP - 863

EP - 868

JO - Chemosphere

JF - Chemosphere

IS - 7

ER -

Adsorption of mono- and di-butyltin by a wheat charcoal: pH effects and modeling

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