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Article
Al-Khriet Agricultural Waste Adsorbent, for Removal Lead and Cadmium Ion from Aqueous Solutions
استخدام الخريط كماده مازه لازاله ايونات الرصاص والكادميوم من المحاليل المائيه

Author: Maha H. Al-Hassani مها هادي مصطفى الحسني
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2013 Volume: 9 Issue: 2 Pages: 69- 76
Publisher: Baghdad University جامعة بغداد

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Abstract

The availability of low- cost adsorbent namely Al-Khriet ( a substance found in the legs of Typha Domingensis) as an agricultural waste material, for the removal of lead and cadmium from aqueous solution was investigated. In the batch tests experimental parameters were studied, including adsorbent dosage between (0.2-1) g, initial metal ions concentration between (50-200) ppm (single and binary) and contact time (1/2-6) h. The removal percentage of each ion onto Al-Khriet reached equilibrium in about 4 hours. The highest adsorption capacity was for lead (96%) while for cadmium it was (90%) with 50 ppm ions concentration, 1 g dosage of adsorbent and pH 5.5. Adsorption capacity in the binary mixture were reduce at about 8% for lead and 12 % for cadmium, which was attributed to competitive adsorption. The adsorption parameters were analyzed using both the Freundlich and Langmuir. Al-Khriet was best fitted by the Freundlich isotherm comparing with Langmuir model, and the rate constant was found to be 1.305 and 0.621 ((mg/g)(L/mg)1/n) for lead and cadmium respectively , while the kinetic of adsorption obeyed a second order rate equation and the rate constants were found to be (0.0161) for lead and ( 0.0125) mg.g-1.min-1 for cadmium.

يهدف البحث الى استخدام النفايات الزراعيه المتوفره محليا وباقل كلفه لازالة المركبات الثقيله كالرصاص والكاديميوم من المحاليل المائيه كالخريط وهو ماده موجوده في سيقان نبات البردي كماده مازه. تم دراسة تأثير تركيز الماده المازه، تركيز أيونات الرصاص والكاديميوم بصوره منفرده وممزجه معا وزمن الأمتزاز عن النسبه الموئيه للأزاله والكميه الممتزه . تم الحصول عاى نسبه ازاله للرصاص 96% وللكاديميوم 90% عن الظروف التشغيليه ، درجه حامضيه 5,5 وكمية الماده المازه 1 غم وتركيز الأيونات 50 ملغم لكل لتر وزمن الأمتزاز 4 ساعه وعند مزج الأيونات قلت نسبة الأمتزاز بحوالي 8% للرصاص و12% للكاديميوم بسب ظاهرة التزاحم والتنافس على المراكز الفعاله للخريط . تم استخدام معادلة لانكماير وفريندلج بشكل ناجح , وكان استخدام معادله لانكماير لتمثيل نتائج امتزاز كل من الأيونات بشكل افضل من معادله فريندلج حيث كان معدل ثابت لانكماير 1,305 و 0,621 ملغم غم لكل من الرصاص والكاديميوم على التوالي بينما حركية عملية الأمتصاص تمثلت بمعادله من الدرجه الثانيه حيث كان معدل ثابت الأمتصاص 0,061 و0,0125ملغمغم دقيقه لكل من الرصاص والكاديميوم على التوالي.


Article
Removal of Phenolic Compounds from Aqueous Solution by Using Agricultural Waste (Al-Khriet)

Author: Hayder A.K. Al-jandeel حيدر عبد الكريم
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2013 Volume: 14 Issue: 3 Pages: 55-62
Publisher: Baghdad University جامعة بغداد

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Abstract

Adsorption techniques are widely used to remove organics pollutants from waste water particularly, when using low cost adsorbent available in Iraq. Al-Khriet powder which was found in legs of Typha Domingensis is used as bio sorbent for removing phenolic compounds from aqueous solution. The influence of adsorbent dosage and contact time on removal percentage and adsorb ate amount of phenol and 4- nitro phenol onto Al-Khriet were studied. The highest adsorption capacity was for 4-nitrophenol 91.5% than for phenol 82% with 50 mg/L concentration, 0.5 gm. dosage of adsorbent and pH 6 under a batch condition. The experimental data were tested using different isotherm models. The results show that Freundlich model resulted in the best fit also the kinetic study make it clear that the adsorption process proceeded according to the pseudo second order model

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