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Article
Visible Light Photocatalytic Decolourization of Methyl Orange Using N-Doped TiO2 Nanoparticles

Authors: Hussein M. Hadi --- Hilal S. Wahab
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2015 Volume: 18 Issue: 3 Pages: 1-9
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In the present study, nitrogen doped TiO2 (N-TiO2) has been synthesized by simple sol-gel technique. The light absorption property and morphology of the N-TiO2 were characterized by Diffused Reflectance UV-VIS spectrometer and scanning electron microscopy (SEM). The results showed a clear shift in the light absorption from UV region (380) to visible region (410 nm). SEM results showed the morphology was changed after doping process compared with the pure anatase TiO2. The photocatalytic activity was examined by the photo decolorization of the Methyl Orange which was used as a pollutant model in this study under visible light irradiation. The main operational parameters, namely, initial pollutant concentration, doped photocatalyst loading, pH of photocatalysis solution and visible light intensity on the rate of photocatalytic decolorization. The results show that N doping induced the enhancement of photocatalytic decolorization. Methyl orange removal efficiency results at optimum experimental conditions have revealed more than 98% degradation after 60 minutes of illumination.

حُضر مسحوق ثنائي اوكسيد التيتانيوم النانوي المشوب بذرات النتروجين مختبريا باستخدام طريقة سول-جل واُختبرت كفائته بإزالة لون صبغة المثيل البرتقالي تحت الضوء المرئي. لقد اُستخدمت تقنية المجهر الإلكتروني الماسح لدراسة طوبوغرافية السطح والتحليل الطيفي الانعكاسي في مجال الاشعة المرئية وفوق البنفسجية لحساب طاقة الفجوة والمساوية إلى 3.02 إلكترون فولت (410 نانوميتر) مقارنة بطاقة الفجوة لثنائي أوكسيد التيتانيوم القياسي (الانتيز) المساوية إلى 3.26 إلكترون فولت (380 نانوميتر). تم دراسة المؤثرات التشغيلية الرئيسة على عملية القصر مثل التركيز الابتدائي للصبغة ، كمية المسحوق النانوي، الدالة الحامضية للوسط وشدة الضوء المرئي. بينت النتائج الدور الايجابي للتشويب في عملية قصر الصبغة وصولا إلى تحطيم أكثر من 98% منها خلال فترة 60 دقيقة من التعرض للضوء المرئي. كما وجد إن هذه النتائج تتفق بشكل كبير مع نتائج البحوث الأخرى.


Article
Determination of Toxic Elements in Tobacco, Tobacco Smoke and Ash from Selected Imported Cigarettes Brands

Authors: Wedad Al-Dahhan --- Hassan Hashim --- Hanan Ibraheem --- Hussein M. Hadi --- et al.
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2018 Volume: 21 Issue: 4 Pages: 23-29
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Metals are essential to the human body but can be harmful to health when it exceeds permissible limits. Different sorts of cigarettes were chosen from the markets in Iraq to conduct the tests of the elements in these species. The chose samples were tested using EDX instrument. Results demonstrated the presence of the proportions of dangerous elements such as (Sb, Ni, Zn, P, Pb, Cd, Ca, Si, S, Cr, Mg, Na, As, Al, Cl, and Sn), which greatly affect the health of the smoker and its negative effects to the environment. The genuine risk is the result of accumulate these elements in the body of the smoker's lungs, liver, blood or brain and its effects are chronic and more dangerous and threatens the life of the person in the future. A special absorption system was used to absorb tobacco smoke for the tested samples by deionized water. The remaining ash collected for acid digestion and prepared to atomic absorption analyses.

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