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:: Volume 1, Issue 1 (Autumn, 2014) ::
Environ. health eng. manag. 2014, 1(1): 1-5 Back to browse issues page
Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions
Ali Asghar Najafpoor , Ghorban Soleimani , Mohammad Hasan Ehrampoush , Mohammad Taghi Ghaneian , Elham Rahmanpour Salmani , Maryam Dolatabadi Takabi
Department of Environmental Health, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran , Rahmanpoure921@mums.ac.ir
Abstract:   (5903 Views)

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.

Keywords: Adsorption isotherm, Carbon nano tubes, Hexavalent chromium
eprint link: http://eprints.kmu.ac.ir/id/eprint/22127
Full-Text [PDF 387 kb]   (1776 Downloads)    
Type of Study: Research | Subject: General
Received: 2014/12/27 | Accepted: 2014/12/27 | Published: 2014/12/27
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Najafpoor A A, Soleimani G, Ehrampoush M H, Ghaneian M T, Rahmanpour Salmani E, Dolatabadi Takabi M. Study on the adsorption isotherms of chromium (VI) by means of carbon nano tubes from aqueous solutions. Environ. health eng. manag.. 2014; 1 (1) :1-5
URL: http://ehemj.com/article-1-40-en.html


Volume 1, Issue 1 (Autumn, 2014) Back to browse issues page
مجله مدیریت و مهندسی بهداشت محیط Environmental Health Engineering And Management Journal
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