research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Adsorption of Methyl Green Dye onto Bamboo in Batch and Continuous System

Author: Ahmed Adnan Atshan احمد عدنان
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2014 Volume: 15 Issue: 1 Pages: 65-72
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Adsorption techniques are widely used to remove certain classes of pollutants from waters, especially those that are not easily biodegradable. Dyes represent one of the problematic groups. The removal of methyl green from waste water using bamboo was studied in batch and continuous system. In batch system equilibrium time and adsorption isotherm was studied at different concentrations (5, 10, 15, 20, 25 and 30 ppm) and 50 mg weight of adsorbent. Langmuir and Freundlich equations were applied for adsorption isotherm data. Langmiur equation was fitted better than Freundlich equation (R2=0.984 for Langmuir equation).The maximum percentage dye removal obtained 79.4% and adsorption capacity was 15.5 mg/g. For continuous system the breakthrough curve was studied at different bed depths (1, 2 and 4 cm), different concentrations (5 and 10 ppm), and different flow rates (5 and 10 ml/min).


Article
Optimization of Photocatalytic Decolourization of Methyl Green Dye Using Commercial Zinc Oxide as catalyst
التحفيز الضوئي المثالي لازالة صبغة المثل الاخضر باستخدام اوكسيد الخارصين التجاري كعامل مساعد

Authors: Eitemad* S. Fathal --- Luma** M. Ahmed
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2015 Volume: 13 Issue: 1 Pages: 53-63
Publisher: Kerbala University جامعة كربلاء

Loading...
Loading...
Abstract

This study describes the results for series of experiments on photocatalytic decolourization of methyl green dye from aqueous solution in the presence of commercial ZnO suspension. The photocatalytic decolourization has been studied as a function of initial dye concentration, best dose of ZnO, initial pH of aqueous solution, and temperature by regular intervals from experiments. The decolourization of methyl green dye process was found to follow pseudo-first order kinetics with the use of artificial UV (A) light sources. The optimum dye and catalyst concentration was measured and found equal to be 50 ppm and 700 mg/ 200 mL-1 respectively. The best value of pH for the photocatalytic decolourization of methyl green dye in the presence of ZnO suspension is pH 5.4. The Photocatalytic decolourization reaction of dye was endothermic and found the rate of reaction increased with increasing temperature. Arrhenius plot obtains that the activation energy for this reaction is equal to 24. 914 kJ mol-1, this value is small that beyond to be associated with the transport of photoelectrons through the catalyst to the adsorbed oxygen on the surface.

تصف هذه الدراسة النتائج التي تم الحصول عليها خلال سلسة من تجارب الازالة اللونية المحفزة ضوئياً للمحلول المائي لصبغة المثل الاخضر بوجود عالق من اوكسيد الخارصين ZnO التجاري. تم دراسة عملية الازالة اللونية المحفزة ضوئياً كدالة لـ تركيز الصبغة الابتدائي، و افضل جرعة من الـ ZnO ، والدالة الحامضية pH الابتدائية للمحلول، و درجة الحرارة عند تجارب ذات ازمنة متسلسلة.حسب كل من تركيز الصبغة والعامل المساعد، وكانت تساوي 50 جزء من المليون و 700 ملغم مللتر على التوالي. كما وجدت افضل قيمة للدالة الحامضية لعملية الازالة اللونية المحفزة لصبغة المثل الاخضر بوجود عالق من الـ ZnO وكانت تساوي 5.4. وجد ان تفاعل الازالة اللونية المحفز ضوئيا ماص للحرارة وان سرعة التفاعل تزداد بزيادة درجة الحرارة. حسبت قيمة طاقة التنشيط من خلال معادلة ارينوس وكانت تساوي 24.914 كيلو جولمول ، هذه القيمة تعتبر قليلة ويعود ذلك الى تجمع وانتقال الالكترونات الضوئية خلال العامل المساعد ولامتزاز الاوكسجين على سطحه.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2015 (1)

2014 (1)