Nickel adsorption on chalk and calcite

Dina Alexandrovna Belova; Leonid Lakshtanov; J.F. Carneiro; Susan Louise Svane Stipp

doi:10.1016/j.jconhyd.2014.09.007

Nickel adsorption on chalk and calcite

Dina Alexandrovna Belova^*, Leonid Lakshtanov, J.F. Carneiro, Susan Louise Svane Stipp

^*Corresponding author af dette arbejde

Kemisk Institut

14 Citationer (Scopus)

Abstract

Nickel uptake from solution by two types of chalk and calcite was investigated in batch sorption studies. The goal was to understand the difference in sorption behavior between synthetic and biogenic calcite. Experiments at atmospheric partial pressure of CO₂, in solutions equilibrated with calcite and chalk and pH ranging from 7.7 to 8.8, explored the influence of initial concentration and the amount and type of sorbent on Ni uptake. Adsorption increases with increased surface area and pH. A surface complexation model describes the data well. Stability constants for the Ni surface complex are log K_Ni = - 1.12 on calcite and log K_Ni = - 0.43 and - 0.50 on the two chalk samples. The study confirms that synthetic calcite and chalk both take up nickel, but Ni binds more strongly on the biogenic calcite than on inorganically precipitated, synthetic powder, because of the presence of trace amounts of polysaccharides and clay nanoparticles on the chalk surface.

Originalsprog	Engelsk
Tidsskrift	Journal of Contaminant Hydrology
Vol/bind	170
Sider (fra-til)	1-9
Antal sider	9
ISSN	0169-7722
DOI	https://doi.org/10.1016/j.jconhyd.2014.09.007
Status	Udgivet - 2014

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10.1016/j.jconhyd.2014.09.007

Citationsformater

@article{51294d2b4814494e9fa54992b2fc6d4f,

title = "Nickel adsorption on chalk and calcite",

abstract = "Nickel uptake from solution by two types of chalk and calcite was investigated in batch sorption studies. The goal was to understand the difference in sorption behavior between synthetic and biogenic calcite. Experiments at atmospheric partial pressure of CO2, in solutions equilibrated with calcite and chalk and pH ranging from 7.7 to 8.8, explored the influence of initial concentration and the amount and type of sorbent on Ni uptake. Adsorption increases with increased surface area and pH. A surface complexation model describes the data well. Stability constants for the Ni surface complex are log KNi = - 1.12 on calcite and log KNi = - 0.43 and - 0.50 on the two chalk samples. The study confirms that synthetic calcite and chalk both take up nickel, but Ni binds more strongly on the biogenic calcite than on inorganically precipitated, synthetic powder, because of the presence of trace amounts of polysaccharides and clay nanoparticles on the chalk surface.",

keywords = "Calcite, Chalk, Nickel adsorption, Surface complexation model",

author = "Belova, {Dina Alexandrovna} and Leonid Lakshtanov and J.F. Carneiro and Stipp, {Susan Louise Svane}",

year = "2014",

doi = "10.1016/j.jconhyd.2014.09.007",

language = "English",

volume = "170",

pages = "1--9",

journal = "Journal of Contaminant Hydrology",

issn = "0169-7722",

publisher = "Elsevier",

}

TY - JOUR

T1 - Nickel adsorption on chalk and calcite

AU - Belova, Dina Alexandrovna

AU - Lakshtanov, Leonid

AU - Carneiro, J.F.

AU - Stipp, Susan Louise Svane

PY - 2014

Y1 - 2014

N2 - Nickel uptake from solution by two types of chalk and calcite was investigated in batch sorption studies. The goal was to understand the difference in sorption behavior between synthetic and biogenic calcite. Experiments at atmospheric partial pressure of CO2, in solutions equilibrated with calcite and chalk and pH ranging from 7.7 to 8.8, explored the influence of initial concentration and the amount and type of sorbent on Ni uptake. Adsorption increases with increased surface area and pH. A surface complexation model describes the data well. Stability constants for the Ni surface complex are log KNi = - 1.12 on calcite and log KNi = - 0.43 and - 0.50 on the two chalk samples. The study confirms that synthetic calcite and chalk both take up nickel, but Ni binds more strongly on the biogenic calcite than on inorganically precipitated, synthetic powder, because of the presence of trace amounts of polysaccharides and clay nanoparticles on the chalk surface.

AB - Nickel uptake from solution by two types of chalk and calcite was investigated in batch sorption studies. The goal was to understand the difference in sorption behavior between synthetic and biogenic calcite. Experiments at atmospheric partial pressure of CO2, in solutions equilibrated with calcite and chalk and pH ranging from 7.7 to 8.8, explored the influence of initial concentration and the amount and type of sorbent on Ni uptake. Adsorption increases with increased surface area and pH. A surface complexation model describes the data well. Stability constants for the Ni surface complex are log KNi = - 1.12 on calcite and log KNi = - 0.43 and - 0.50 on the two chalk samples. The study confirms that synthetic calcite and chalk both take up nickel, but Ni binds more strongly on the biogenic calcite than on inorganically precipitated, synthetic powder, because of the presence of trace amounts of polysaccharides and clay nanoparticles on the chalk surface.

KW - Calcite

KW - Chalk

KW - Nickel adsorption

KW - Surface complexation model

U2 - 10.1016/j.jconhyd.2014.09.007

DO - 10.1016/j.jconhyd.2014.09.007

M3 - Journal article

C2 - 25300061

AN - SCOPUS:84907899907

SN - 0169-7722

VL - 170

SP - 1

EP - 9

JO - Journal of Contaminant Hydrology

JF - Journal of Contaminant Hydrology

ER -

Nickel adsorption on chalk and calcite

Abstract

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