An empirical kinetic model for calcium removal from calcium impurity-containing saturated boric acid solution by ion exchange technology using Amberlite IR–120 resin

Özmetin, Cengiz; Aydın, Özkan; Kocakerìm, M. Muhtar; Korkmaz, Mustafa; Özmetin, Elif

doi:10.1016/j.cej.2008.09.021

Cited by 30 publications

(24 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…One of the major advantages of such a method is the possibility of obtaining generalized predictive expressions which can be used directly to derive the amount of solute adsorbed at any given solute concentration and the reaction time without the necessity of developing complicated theoretical models, based on some more fundamental assumptions. A similar procedure has been also applied for the data collected in other systems [102][103][104][105].…”

Section: The Pseudo-second Order Equationmentioning

confidence: 99%

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

Płaziński

Rudziński

Płazińska

2009

Advances in Colloid and Interface Science

815

393

View full text Add to dashboard Cite

Section: The Pseudo-second Order Equationmentioning

confidence: 99%

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

Płaziński

Rudziński

Płazińska

2009

Advances in Colloid and Interface Science

815

393

View full text Add to dashboard Cite

“…Temperature either increases or decreases the adsorption capacity of the adsorbents because the adsorption mechanism is either endothermic or exothermic. Also, adsorbents can cower with temperature decrease and results in pore diffusion resistance, on the other hand, the adsorbents can swell with temperature increase that causing to decrease of pore diffusion resistance Özmetin et al, 2009). In this study, copper removal as a function of time, concentration and temperature is given in Figure 4-7.…”

Section: Concentration Temperature and Time Effect On Copper Removalmentioning

confidence: 87%

“…Adsorption experiments carried out in batch mode as a function of time are the most common way to find out the kinetics of the process and the rate constant is the most important design parameter as it controls the retention time (Chabani et al, 2007;Özmetin et al, 2009). Optimum time for the batch and fixed bed reactors can be determined by conducting kinetic studies.…”

Section: Concentration Temperature and Time Effect On Copper Removalmentioning

confidence: 99%

Kinetic and Fixed Bed Studies for Copper Removal from Solutions by Walnut Tree Sawdust (Juglans regia Linnaeus)

2017

Global NEST Journal

View full text Add to dashboard Cite

This study investigates the adsorption kinetics and removal conditions of copper by walnut tree sawdust from synthetic solutions in the batch and fixed bed reactors. The selected experimental parameters for the batch reactor were concentration, solution pH, adsorbent amount and temperature. The optimum batch reactor conditions were applied to the fixed bed reactor. The experimental parameters of the fixed bed reactor were flow rate, bed height, and concentration. The optimum removal conditions for copper removal in the batch reactor were determined as pH (5), temperature (25 o C), concentration (25 mg/L), and adsorbent dosage (10 g/L). The kinetic data obtained from the batch reactor were analyzed by the pseudo-first-order and the pseudo-second-order kinetic models and the kinetic data were successfully correlated with the pseudo-second-order model. Activation energy of the process was calculated to be 15.79 kJ/mol. The optimum parameters for the fixed bed reactor were designated as 0.5 mL/min flow rate, 100 mg/L concentration and 15 cm bed height. The kinetic data obtained from the fixed bed reactor were analyzed with the Yoon-Nelson and Thomas kinetic models. The fixed bed kinetics could be described with the Thomas model. Maximum adsorption capacity was calculated as 6.24 mg/g in the fixed bed reactor.

show abstract

“…This result was attributed to that the surface of the illite mineral became negative at high pHs and thereby the capacity increased. On the other hand, the competitive adsorption occurred between hydrogen ions and copper for fixation sites on illite surface and hence capacity decreased at low pHs 23 . 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 .…”

Section: Effect Of Parameters Effect Of Phmentioning

confidence: 98%

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

An empirical kinetic model for calcium removal from calcium impurity-containing saturated boric acid solution by ion exchange technology using Amberlite IR–120 resin

Cited by 30 publications

References 28 publications

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

Kinetic and Fixed Bed Studies for Copper Removal from Solutions by Walnut Tree Sawdust (Juglans regia Linnaeus)

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

Contact Info

Product

Resources

About