Modelling the adsorption of Cd(II), Cu(II), Ni(II), Pb(II), and Zn(II) onto Fithian illite

Gu, Xueyuan; Evans, L. J.

doi:10.1016/j.jcis.2006.11.022

Cited by 152 publications

(55 citation statements)

References 25 publications

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“…The equilibrium constant for Cd ?2 has been taken from Gu and Evans (2007). For Cr ?3 , the equilibrium constant for surface complexation onto hydrous ferric oxide (Scott 2010) is used.…”

Section: Initialisation Of Reactive-transport Conditionsmentioning

confidence: 99%

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Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Schwartz

2014

Environ Earth Sci

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The hypothetical leakage of methane gas caused by fracking a 1,000-m deep Cretaceous claystone horizon at Damme, Germany, is simulated in a TOUGH-REACT reactive-transport model with 5,728 elements. A hypothetical leakage zone connects the Cretaceous horizon with a Quaternary potable-water aquifer (q1). Methane gas rises up to the q1 horizon in less than 2 days in all calculated scenarios. The simulations include the major constituents of groundwater as well as the seven most hazardous trace components that are natural constituents of groundwater (As, Cd, Cr, Ni, Pb, Se and U). The general trend is characterised by depletion of the natural hazardous components with decreasing acidity and oxygen fugacity in the relevant pH range (7-9). Nevertheless, the concentrations of elements whose dominant aqueous species are negatively charged in this pH range (Cr and Se) rise against the general trend due to desorption reactions. Slight enhancement effects are produced by the dissolution of contaminant-bearing oxides such as Cr-bearing goethite. In summary, the geological risks of a fracking operation are minor. The technical risks are more important. This is especially the case when rising methane gas gets into contact with fracking fluid that accidentally escapes through faulty well seals.

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“…The equilibrium constant for Cd ?2 has been taken from Gu and Evans (2007). For Cr ?3 , the equilibrium constant for surface complexation onto hydrous ferric oxide (Scott 2010) is used.…”

Section: Initialisation Of Reactive-transport Conditionsmentioning

confidence: 99%

“…The site density (5.8 9 10 -6 mol/m 2 ) as well as some surface-complexation equilibrium constants are taken from a compilation of Schwartz (2014), other sources being Gu and Evans (2007) and Scott (2010). The surface area for surface complexation onto illite is a calibrated maximum value.…”

Section: Initialisation Of Reactive-transport Conditionsmentioning

confidence: 99%

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Schwartz

2014

Environ Earth Sci

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“…Similar pH effect was reported for cation adsorption onto illite clay 3,18 and Alvarez-Puebla and coworkers reported that copper adsorption increased with pH increase of solution 20 . Also, Gu and coworkers reported two distinct mechanisms for metal adsorption onto illite: (i) nonspecific ionexchange reaction occurring on the ≡SiO -and ≡AlO -sites at low pH values (3-6) (ii) specific adsorption occurring on the ≡SiOH and ≡AlOH sites at high pH (6-9) values 19 . (1) Where, C o and C e are the solution copper concentrations at initial and equilibrium (mol/L).…”

Section: Effect Of Parameters Effect Of Phmentioning

confidence: 99%

“…Although the illite is found abundantly in nature 18 , the studies showing the use of illite for heavy metal adsorption are limited. The reported studies have showed that illite mineral has a strong affinity towards heavy metal cations 3,18,19 . Alvarez and coworkers studied the adsorption of copper on illite and the isotherm data were explained by the sum of the several single Langmuir and Freundlich models 20 .…”

Section: Introductionmentioning

confidence: 99%

“…Alvarez and coworkers studied the adsorption of copper on illite and the isotherm data were explained by the sum of the several single Langmuir and Freundlich models 20 . In several studies, a constant capacitance model was used to describe the metal adsorption mechanism onto illite surface 18,19 . Turan and coworkers developed a linear model for the copper and zinc adsorption onto illite surface using 2 3 factorial experimental designs 3 .…”

Section: Introductionmentioning

confidence: 99%

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An Empirical Model for Adsorption Thermodynamics of Copper (Ii) From Solutions Onto Illite Clay-Batch Process Design

Fìl

Korkmaz

Özmetin

2014

J. Chil. Chem. Soc.

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The copper causes important health problems risk when it exists at high concentrations in drinking waters and daily feeds. Therefore, in this study, copper adsorption from solutions onto illite clay was investigated in batch mode as a function of the initial solution pH (3-6), temperature (30-60 ºC) and ionic strength (0-0.1 mol/L -1 NaCl). The equilibrium was attained within 24 hours. Optimum conditions were determined as pH 6, temperature 60 ºC and 0 mol/L -1 NaCl concentration. The isotherm data followed the S-class isotherm. The reason of this S-class isotherm was either solute-solute attractive forces at the surface causing cooperative adsorption or a competing reaction such as complexation with a ligand. Mathematically, the isotherm data were explained with the sum of several single Freundlich models. Also, the thermodynamic parameters of the process were calculated. Positive values of Gibbs free energy change (ΔGº) indicated that the adsorption process was unspontaneous. As the enthalpy change (ΔHº) had positive value for all the parameter intervals, copper adsorption was concluded to be physical and endothermic process. The positive entropy values indicated that the randomness at solid-liquid interface increased with concentration decrease. Maximum copper adsorption capacity of illite clay was calculated at 60 o C as 1.823×10 -5 mol/g. Furthermore, an empirical model was developed to determine the thermodynamic parameters of the process and operation conditions of the batch reactor as follows.

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Modeling the Potential Impacts of CO₂Sequestration on Shallow Groundwater

Zheng

Spycher

2018

Reactive Transport Modeling

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Modelling the adsorption of Cd(II), Cu(II), Ni(II), Pb(II), and Zn(II) onto Fithian illite

Cited by 152 publications

References 25 publications

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

An Empirical Model for Adsorption Thermodynamics of Copper (Ii) From Solutions Onto Illite Clay-Batch Process Design

Modeling the Potential Impacts of CO₂Sequestration on Shallow Groundwater

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Modelling the adsorption of Cd(II), Cu(II), Ni(II), Pb(II), and Zn(II) onto Fithian illite

Cited by 152 publications

References 25 publications

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

An Empirical Model for Adsorption Thermodynamics of Copper (Ii) From Solutions Onto Illite Clay-Batch Process Design

Modeling the Potential Impacts of CO2Sequestration on Shallow Groundwater

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Modeling the Potential Impacts of CO₂Sequestration on Shallow Groundwater