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Adsorption of Zn(II) from aqueous solution by using different adsorbents [An article from: Chemical Engineering Journal]
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Author(s)Bhattacharya, A.K.
ISBN / ASINB000PAU6JA
ISBN-13978B000PAU6J6
AvailabilityIn Stock
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The removal of Zn(II) from aqueous solution by different adsorbents was investigated. Clarified sludge (a steel industry waste material), rice husk ash, neem bark and a chemical adsorbent activated alumina were used for the adsorption studies. The influence of pH, contact time, initial metal concentration, adsorbent nature and concentration on the selectivity and sensitivity of the removal process was investigated. The adsorption of Zn(II) increased with increased concentration of the adsorbents and reached maximum uptake at 10g/L and pH between 5 and 7. The equilibrium time was achieved after 1h for clarified sludge, 3h for rice husk ash and 4h for activated alumina and neem bark, respectively. The adsorption process was found to follow a first-order rate mechanism and rate constant was evaluated at 30^oC. The rate constant was highest in case of clarified sludge (6.90x10^-^2min^-^1) and the activated alumina gave the lowest value (1.86x10^-^2min^-^1). Langmuir and Freundlich adsorption isotherms fit well in the experimental data and their constants were evaluated. The thermodynamic equilibrium constant and the Gibbs free energy were calculated for each system. The adsorption capacity (q"m"a"x) calculated from Langmuir isotherm and the values of Gibbs free energy obtained showed that clarified sludge has the largest capacity and affinity for the removal of Zn(II) compared to the other adsorbents used in the study.
Description:
The removal of Zn(II) from aqueous solution by different adsorbents was investigated. Clarified sludge (a steel industry waste material), rice husk ash, neem bark and a chemical adsorbent activated alumina were used for the adsorption studies. The influence of pH, contact time, initial metal concentration, adsorbent nature and concentration on the selectivity and sensitivity of the removal process was investigated. The adsorption of Zn(II) increased with increased concentration of the adsorbents and reached maximum uptake at 10g/L and pH between 5 and 7. The equilibrium time was achieved after 1h for clarified sludge, 3h for rice husk ash and 4h for activated alumina and neem bark, respectively. The adsorption process was found to follow a first-order rate mechanism and rate constant was evaluated at 30^oC. The rate constant was highest in case of clarified sludge (6.90x10^-^2min^-^1) and the activated alumina gave the lowest value (1.86x10^-^2min^-^1). Langmuir and Freundlich adsorption isotherms fit well in the experimental data and their constants were evaluated. The thermodynamic equilibrium constant and the Gibbs free energy were calculated for each system. The adsorption capacity (q"m"a"x) calculated from Langmuir isotherm and the values of Gibbs free energy obtained showed that clarified sludge has the largest capacity and affinity for the removal of Zn(II) compared to the other adsorbents used in the study.
