Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions
Background: The presence of heavy metals in the environment especially in water supplies have caused many concerns because of their toxicity and non-degradability. Hexavalent Chromium (Cr) is one of the most toxic metals which is used in many industries, so it is essential to remove it from industri...
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| Format: | Article |
| Language: | English |
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Kerman University of Medical Sciences
2014-11-01
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| Series: | Environmental Health Engineering and Management |
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| Online Access: | http://ehemj.com/browse.php?a_id=40&sid=1&slc_lang=en |
| _version_ | 1819038348366315520 |
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| author | Ali Asghar Najafpoor Ghorban Soleimani Mohammad Hasan Ehrampoush Mohammad Taghi Ghaneian Elham Rahmanpour Salmani Maryam Dolatabadi Takabi |
| author_facet | Ali Asghar Najafpoor Ghorban Soleimani Mohammad Hasan Ehrampoush Mohammad Taghi Ghaneian Elham Rahmanpour Salmani Maryam Dolatabadi Takabi |
| author_sort | Ali Asghar Najafpoor |
| collection | DOAJ |
| description | Background: The presence of heavy metals in the environment especially in water supplies have caused many concerns because of their toxicity and non-degradability. Hexavalent Chromium (Cr) is one of the most toxic metals which is used in many industries, so it is essential to remove it from industrial wastewater. In this study, we made a comparison between different adsorption isotherms in the chromium (VI) removal process using carbon nano tubes from aqueous solutions.
Methods: This experimental study used atomic absorption spectrophotometry. To determine the adsorption isotherms, a synthetic sample with defined concentration of Cr (VI) was prepared and different doses of adsorbent were added to it. The effect of initial Cr concentration, pH, adsorbent dose, and reaction time on removal of Cr was investigated. Temperature and mix rate were steady during a defined time. At the end, Cr (VI) concentration measured and adsorbents equality capacities were calculated via formulas and graphs. Data analysis were performed using descriptive statistics.
Results: Adsorption capacities (qe) increased with increasing of initial Cr concentration, and reaction time decreased with increasing adsorbent dose and pH. Correlation coefficients for Langmuir, and Freundlich isotherms in oxidized Multi-Walled Carbon Nano Tubes (MWCNTs) were 0.93, 0.874, and 0.714 and in oxidized Single-Walled Carbon Nano Tubes (SWCNTs) were 0.904, 0.868, and 0.711 respectively.
Conclusion: Chromium ions adsorption in carbon nano tubes is accordant to Langmuir isotherm model, and MWCNTs have more cc than SWCNTs. Carbon nano tubes are effective adsorbents in removal of Cr (VI) from aqueous solutions. |
| first_indexed | 2024-12-21T08:35:53Z |
| format | Article |
| id | doaj.art-ed274765c4f84c9e822dcf50cda1e6ef |
| institution | Directory Open Access Journal |
| issn | 2423-3765 2423-4311 |
| language | English |
| last_indexed | 2024-12-21T08:35:53Z |
| publishDate | 2014-11-01 |
| publisher | Kerman University of Medical Sciences |
| record_format | Article |
| series | Environmental Health Engineering and Management |
| spelling | doaj.art-ed274765c4f84c9e822dcf50cda1e6ef2022-12-21T19:10:04ZengKerman University of Medical SciencesEnvironmental Health Engineering and Management2423-37652423-43112014-11-011115Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutionsAli Asghar Najafpoor0Ghorban Soleimani1Mohammad Hasan Ehrampoush2Mohammad Taghi Ghaneian3Elham Rahmanpour Salmani4Maryam Dolatabadi Takabi5Associate Professor, Health Sciences Research Center, Department of Environmental Health Engineering, School of Health, Mashhad University of Medical Sciences, Mashhad, IranMS of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, IranProfessor, Environmental Health Engineering Department, Shahid Sadoughi University of Medical Sciences, Yazd, IranAssociate Professor, Environmental Health Engineering Department, Shahid Sadoughi University of Medical Sciences, Yazd, IranMSc student of Environmental Health Engineering, Student Research Committee, Department of Environmental Health, School of Health, Mashhad University of Medical Sciences, Mashhad, IranMSc student of Environmental Health Engineering, Student Research Committee, Department of Environmental Health, School of Health, Mashhad University of Medical Sciences, Mashhad, IranBackground: The presence of heavy metals in the environment especially in water supplies have caused many concerns because of their toxicity and non-degradability. Hexavalent Chromium (Cr) is one of the most toxic metals which is used in many industries, so it is essential to remove it from industrial wastewater. In this study, we made a comparison between different adsorption isotherms in the chromium (VI) removal process using carbon nano tubes from aqueous solutions. Methods: This experimental study used atomic absorption spectrophotometry. To determine the adsorption isotherms, a synthetic sample with defined concentration of Cr (VI) was prepared and different doses of adsorbent were added to it. The effect of initial Cr concentration, pH, adsorbent dose, and reaction time on removal of Cr was investigated. Temperature and mix rate were steady during a defined time. At the end, Cr (VI) concentration measured and adsorbents equality capacities were calculated via formulas and graphs. Data analysis were performed using descriptive statistics. Results: Adsorption capacities (qe) increased with increasing of initial Cr concentration, and reaction time decreased with increasing adsorbent dose and pH. Correlation coefficients for Langmuir, and Freundlich isotherms in oxidized Multi-Walled Carbon Nano Tubes (MWCNTs) were 0.93, 0.874, and 0.714 and in oxidized Single-Walled Carbon Nano Tubes (SWCNTs) were 0.904, 0.868, and 0.711 respectively. Conclusion: Chromium ions adsorption in carbon nano tubes is accordant to Langmuir isotherm model, and MWCNTs have more cc than SWCNTs. Carbon nano tubes are effective adsorbents in removal of Cr (VI) from aqueous solutions.http://ehemj.com/browse.php?a_id=40&sid=1&slc_lang=enAdsorption isothermCarbon nano tubesHexavalent chromium |
| spellingShingle | Ali Asghar Najafpoor Ghorban Soleimani Mohammad Hasan Ehrampoush Mohammad Taghi Ghaneian Elham Rahmanpour Salmani Maryam Dolatabadi Takabi Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions Environmental Health Engineering and Management Adsorption isotherm Carbon nano tubes Hexavalent chromium |
| title | Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions |
| title_full | Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions |
| title_fullStr | Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions |
| title_full_unstemmed | Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions |
| title_short | Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions |
| title_sort | study on the adsorption isotherms of chromium vi by means of carbon nano tubes from aqueous solutions |
| topic | Adsorption isotherm Carbon nano tubes Hexavalent chromium |
| url | http://ehemj.com/browse.php?a_id=40&sid=1&slc_lang=en |
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