Document Details
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Document Type |
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Thesis |
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Document Title |
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Thermodynamic and Kinetics Studies of Selected Heavy Metals Ions Removal from Aqueous Solutions by Carbon Nanotubes دراسة حركية و حرارية لإزالة ايونات المعادن الثقيلة من المحاليل المائية باستخدام أنابيب الكربون النانونية |
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Subject |
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Faculty of Sciences |
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Document Language |
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Arabic |
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Abstract |
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Industrial wastewater contaminated with heavy metals such as lead, cadmium, zinc and copper is commonly produced from many kinds of industrial processes. Therefore, if this wastewater is not treated with a suitable process or leaked from storage tanks, it can cause a serious environmental problem in the natural eco-system. Whenever toxic heavy metals are exposed to the natural eco-system, accumulation of metal ions such as lead, cadmium, zinc and copper in human and other living organism’s bodies will be occurred through either direct intake or food chains. In order to remove toxic heavy metals from water systems, several methods have been suggested and investigated. The target of this thesis is removal of lead, cadmium, zinc and copper from aqueous solution by adsorption method using multi-walled carbon nanotubes (MWCNTs) as a promising adsorbents. They have been predicted and experimentally proven to possess exceptional mechanical properties, unique electrical properties, high chemical and thermal stability and a large specific surface area, and thus have attracted great attention in many applications.
The effect of solution conditions such as solution pH, initial metal ions concentration, dosage of the MWCNTs, contact time and ionic strength were investigated. Generally the percentage uptake increased with an increase in pH from pH 3 to 7. The optimum pH found in this study was 7. The removal of Cu(II), Pb(II), Cd(II) and Zn(II) was optimal for higher dosage of MWCNTs. The short contact time needed to reach equilibrium as well as the high adsorption capacity demonstrates that MWCNTs are good adsorbents for the removal of Cu(II), Pb(II), Cd(II) and Zn(II) from aqueous solution.
The results show that the 8-HQ-MWCNTs was better than non-modified MWCNTs in adsorption of Cu(II), Pb(II), Cd(II) and Zn(II) from aqueous solution. The kinetics of the adsorption process was found to follow the pseudo-second-order rate law. The adsorption/desorption study showed that MWCNTs could be efficiently regenerated by a 2 M HNO3 solution and the adsorption capacity was maintained after 3 cycles of the adsorption/desorption process. |
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Supervisor |
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Dr. Mohamed Abdel Salam |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1432 AH
2011 AD |
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Co-Supervisor |
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Dr. Samia A. Kosa |
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Added Date |
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Monday, July 4, 2011 |
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Researchers
| غالية سعيد الزهراني | Al-Zhrani, Ghalia Saeed | Researcher | Master | |
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