Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions
The main objective of the present study was to investigate Cd(II) adsorption by immobilized silica nanopowder within calcium alginate and to determine the isotherm, kinetics, and thermodynamics of the adsorption process. Batch flow mode reactors were used to investigate the effects of initial pH, co...
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| Format: | Article |
| Language: | English |
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Water and Wastewater Consulting Engineers Research Development
2015-07-01
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| Series: | آب و فاضلاب |
| Subjects: | |
| Online Access: | http://www.wwjournal.ir/article_7930_23742b6a856eeb5aa6b21ab0bc9c028b.pdf |
| _version_ | 1819275654598754304 |
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| author | Reza Darvishi Cheshmeh Soltani Hatam Goodini Mohammadjavad Ghannadzadeh Mohammadsadegh Rajaie Mehdi Safari |
| author_facet | Reza Darvishi Cheshmeh Soltani Hatam Goodini Mohammadjavad Ghannadzadeh Mohammadsadegh Rajaie Mehdi Safari |
| author_sort | Reza Darvishi Cheshmeh Soltani |
| collection | DOAJ |
| description | The main objective of the present study was to investigate Cd(II) adsorption by immobilized silica nanopowder within calcium alginate and to determine the isotherm, kinetics, and thermodynamics of the adsorption process. Batch flow mode reactors were used to investigate the effects of initial pH, contact time and metal ion concentration on Cd(II) adsorption. The optimal contact time and initial pH for Cd(II) adsorption were found to be 120 min and 4.0, respectively. Increasing Cd(II) ion concentration from 10 to 1000 mg/L led to increasing adsorbed Cd(II) ions from 5.71 to 100.65 mg/g. The results showed that the Langmuir isotherm model was the best model to describe the experimental data (R2=0.997). The maximum adsorption capacity (qm) for Cd(II) adsorption onto the adsorbent was estimated to be 72.99 mg/g. Based on the mean free energy of adsorption (E) obtained from Dubinin-Radushkevich (D–R) isotherm model, Cd(II) adsorption onto immobilized silica nanopowder follows a chemical mechanism (E=8.451 kJ/mol). The kinetic study indicated that the pseudo-second order model was a more suitable model than the pseudo-first order one for describing Cd(II) adsorption (R2=0.999). Additionally, the negative ∆Hº and ΔGº values demonstrated an exothermic and spontaneous Cd(II) adsorption onto immobilized silica nanopowder. |
| first_indexed | 2024-12-23T23:27:46Z |
| format | Article |
| id | doaj.art-56a0908a4f1b4d539f68b37cd20d1857 |
| institution | Directory Open Access Journal |
| issn | 1024-5936 2383-0905 |
| language | English |
| last_indexed | 2024-12-23T23:27:46Z |
| publishDate | 2015-07-01 |
| publisher | Water and Wastewater Consulting Engineers Research Development |
| record_format | Article |
| series | آب و فاضلاب |
| spelling | doaj.art-56a0908a4f1b4d539f68b37cd20d18572022-12-21T17:26:11ZengWater and Wastewater Consulting Engineers Research Developmentآب و فاضلاب1024-59362383-09052015-07-012632107930Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous SolutionsReza Darvishi Cheshmeh Soltani0Hatam Goodini1Mohammadjavad Ghannadzadeh2Mohammadsadegh Rajaie3Mehdi Safari4Assist. Prof. of Environmental Health Engineering, Faculty of Public Health, Arak University of Medical Sciences, ArakAssoc. Prof. of Environmental Health Engineering, Faculty of Public Health, Lorestan University of Medical Sciences, KhorramabadFaculty Member, Dept. of Environmental Health Engineering, Arak University of Medical Sciences, ArakFaculty Member, Dept. of Environmental Health Engineering, Arak University of Medical Sciences, ArakFaculty Member, Dept. of Environmental Health Engineering, Kurdistan University of Medical Sciences, SanandajThe main objective of the present study was to investigate Cd(II) adsorption by immobilized silica nanopowder within calcium alginate and to determine the isotherm, kinetics, and thermodynamics of the adsorption process. Batch flow mode reactors were used to investigate the effects of initial pH, contact time and metal ion concentration on Cd(II) adsorption. The optimal contact time and initial pH for Cd(II) adsorption were found to be 120 min and 4.0, respectively. Increasing Cd(II) ion concentration from 10 to 1000 mg/L led to increasing adsorbed Cd(II) ions from 5.71 to 100.65 mg/g. The results showed that the Langmuir isotherm model was the best model to describe the experimental data (R2=0.997). The maximum adsorption capacity (qm) for Cd(II) adsorption onto the adsorbent was estimated to be 72.99 mg/g. Based on the mean free energy of adsorption (E) obtained from Dubinin-Radushkevich (D–R) isotherm model, Cd(II) adsorption onto immobilized silica nanopowder follows a chemical mechanism (E=8.451 kJ/mol). The kinetic study indicated that the pseudo-second order model was a more suitable model than the pseudo-first order one for describing Cd(II) adsorption (R2=0.999). Additionally, the negative ∆Hº and ΔGº values demonstrated an exothermic and spontaneous Cd(II) adsorption onto immobilized silica nanopowder.http://www.wwjournal.ir/article_7930_23742b6a856eeb5aa6b21ab0bc9c028b.pdfAdsorptionalginateNanopowdercadmiumImmobilization |
| spellingShingle | Reza Darvishi Cheshmeh Soltani Hatam Goodini Mohammadjavad Ghannadzadeh Mohammadsadegh Rajaie Mehdi Safari Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions آب و فاضلاب Adsorption alginate Nanopowder cadmium Immobilization |
| title | Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions |
| title_full | Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions |
| title_fullStr | Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions |
| title_full_unstemmed | Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions |
| title_short | Application of Immobilized Silica Nanopowder within Alginate for Cadmium Adsorption from Aqueous Solutions |
| title_sort | application of immobilized silica nanopowder within alginate for cadmium adsorption from aqueous solutions |
| topic | Adsorption alginate Nanopowder cadmium Immobilization |
| url | http://www.wwjournal.ir/article_7930_23742b6a856eeb5aa6b21ab0bc9c028b.pdf |
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