Environmental Health Engineering and Management Journal
Environmental Health Engineering and Management Journal
Environ. Health Eng. Manag.
Medical Sciences
http://ehemj.com
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admin
2423-3765
2423-4311
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14
8888
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en
jalali
1393
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gregorian
2014
12
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online
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fulltext
en
Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions
عمومى
General
مقاله اصیل
Original Article
<p dir="ltr">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.</p>
<p dir="ltr">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.</p>
<p dir="ltr">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.</p>
<p dir="ltr">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.</p>
Adsorption isotherm, Carbon nano tubes, Hexavalent chromium
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5
http://ehemj.com/browse.php?a_code=A-10-27-3&slc_lang=en&sid=1
Ali Asghar
Najafpoor
10031947532846001820
10031947532846001820
No
Health Sciences Research Center, Department of Environmental Health Engineering, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran
Ghorban
Soleimani
10031947532846001821
10031947532846001821
No
Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Mohammad Hasan
Ehrampoush
10031947532846001822
10031947532846001822
No
Environmental Health Engineering Department, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Mohammad Taghi
Ghaneian
10031947532846001823
10031947532846001823
No
Environmental Health Engineering Department, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Elham
Rahmanpour Salmani
Rahmanpoure921@mums.ac.ir
10031947532846001824
10031947532846001824
Yes
Department of Environmental Health, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran
Maryam
Dolatabadi Takabi
10031947532846001825
10031947532846001825
No
Student Research Committee, Department of Environmental Health, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran