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Article
Thermodynamic Study of The Adsorption of Some Azo Dyes on Activated Carbon

Authors: Emad Abdulilah Salih Al-Hyali --- Mohammad Thamer Hamed Al-Neemy
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2018 Volume: 14 Issue: 02 Pages: 203-220
Publisher: Diyala University جامعة ديالى

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Abstract

This work is concerned with studying the adsorption of some azo dyes better on commercial activated carbon. The dyes were synthesized by considering the resorcinol as constant part in their structure which is reacted with a number of para substituted aniline via dizonium ions and used as adsorbate for achieving this study. These dyes were identified by a number of physical tests and the available spectroscopic methods. Three models of adsorption isotherms namely, Freundlich, Langmuir , and Tempken are applied to fit the experimented data of adsorption at equilibrium in the range of concentration (1*10-4- 5*10-4)M at various temperatures (292-328)K, and using (1gm/L) of the Adsorbent (Activated Carbon). The results showed that, the Freundlich isotherm is better fitted to the experimental data of the studied systems, although Langmuir isotherm exhibited good fit. This work included performing thermodynamic, depending on calculating the equilibrium constants by different methods, which represented by Freundlich constant Kf, Langmuir constant (KL) and finally is described by Tempkin constant (TK). The results showed good consistency among the four sets of functions in terms of their values and physical meaning. This consistency gave good indication for the accuracy of such kind of calculation.


Article
Thermodynamic Study of Adsorption Fuchsin Acid LR Dye by Eucalyptus leaves powder
دراسة ثرموديناميكية لأمتزاز صبغة Fuchsin Acid LR على سطح مسحوق اوراق الكالبتوز في محاليلها المائية

Authors: Ahlam Mohammed Farhan أحلام محمد فرحان --- Haneen Fadhil Abbas حنين فاضل عباس
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2017 Volume: 13 Issue: 2 - part 3 Pages: 47-60
Publisher: Diyala University جامعة ديالى

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Abstract

This study is concerned with adsorption isotherm of Fuchsin Acid LR by Eucalyptus leaves powder as adsorbent a low-cost and available .Study the effect of adsorbent dose, contact time, initial concentration, pH, and temperature on the adsorption process, the result show that the equilibrium time was (45 min) . and obtained highest adsorption capacity(94.48%) at the adsorbent dose (0.4g) .the effect of pH on amount of adsorbent as follows (pH=7>3>9) . The adsorption isotherm following (Freundlich and Temkin) equations at low temperatures. The thermodynamic functions (ΔG, ΔH, ΔS) of the dye for their adsorption have been calculated, which show the adsorption is spontaneous and the adsorption is exothermic.

أوضحت هذه الدراسة متزاز صبغة الفوشين الحامضية Fuchsin Acid LR على مسحوق اوراق نبات الكالبتوز كسطح قليل الكلفة ومتوفر. تم دراسة تأثير كل من وزن السطح , وقت التماس , التركيز الابتدائي , pH ودرجة الحرارة على عملية الأمتزاز , واظهرت النتائج ان زمن الأتزان 45min , وتم الحصول على اعلى سعة امتزاز(94.48%) عند وزن 0.4gm من السطح المستخدم . وان تأثير الدالة الحامضية على كمية الماده الممتزة كما يلي (pH=7>3>9).ودرست أيزوثيرمات الأمتزاز ووجد انها مطابقة لمعادلتي(فرندلش وتيمكن) للأمتزاز في درجات الحراره الواطئة . وشملت الدراسة على حساب الدوال الثرموديناميكيه ( ΔH, ΔG,ΔS) والتي اظهرت ان التفاعل باعث للحرارة وان عملية امتزاز الصبغة على مسحوق اوراق نبات الكالبتوز تلقائية .


Article
Analytical and Thermodynamic Study of Complex of Co(II) Ion with New Azo Reagent2-((3-methoxy phenyl) diazenyl)- 4,5-diphenyl imidazole (MBDPI)

Author: Zainab Jassim Khdhair* Sami WheedRadhi**
Journal: Almuthanna Journal of Pure Science (MJPS) مجلة المثنى للعلوم الصرفة ISSN: 22263284 Year: 2013 Volume: 1 Issue: 1
Publisher: Al-Muthanna University جامعة المثنى

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Abstract

The new azo reagent 2-((3-methoxy phenyl) diazenyl)-4,5-diphenyl imidazole was designated as (MBDPI) and its metalchelate with Co2+metal ion were prepared. The preparationof the complex have been conducted after fixing theoptimum conditions such as pH and concentration. UV-Visspectrum for reacting of metal solution and the reagentsolution. For wide range of pH (5-11) and concentrationwhich obeys Beer-Lambert Law. The (MBDPI) and its metalchelate were characterized by the analytical andspectroscopic studies of the complex solution such aselemental analysis, FTIR, molar conductivity measurementsand thermodynamic study. It has been found that the azoreagent behaves as neutral bidentate (N,N΄) reagent formingchelate with 1: 2 (metal : reagent) stoichiometry. Theinfrared spectra of the chelating complex have been studiedand compared with the free reagent spectrum. TheConductivity measurements for solutions in ethanol haveshown non-ionic character for the chelatecomplex.Depending on these results we can conclude thatthe proposed geometrical structure of the chelate complex isoctahedral. The synthesized compounds have been tested invitro against a two kinds of pathogenic bacteria to assesstheir antibacterial properties using disk diffusion method,which is aGram negative bacteria:(pseudomonas aeruginosa) and agram positive bacteria( Staphylococcus aureus )The results showed that the reagent, its metal chelate withCo2+and the aqueous solution of metal ion had inhibitionactivity toward the first type of bacteria without the secondtype.


Article
Study of Thermodynamic and Kinetic Adsorption of Azo Dyes on Different Adsorbent Surfaces
دراسة ثيرموديناميكية وحركية أمتزاز عدد من أصباغ ألأزو على سطوح مواد مازة مختلفة

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Abstract

The kinetics and thermodynamics of the removal of Alzarin yellow and Congo red dyes from their aqueous solutions using local clay taken from Shoraw region northwest of the province of Kirkuk - Iraq as well as bentonite and activated charcoal as adsorbents was held, using UV- visible spectroscopy to follow the adsorption process. The equilibrium time of the adsorption process was determined and found that it reached a state of equilibrium in a period of time between 70-50 min, in the case of adsorption of the dyes on the activated charcoal and bentonite surfaces and 70-60 min, when using the clay. The results indicated that the best weight of the adsorbent surfaces is (0.1gm). Adsorption was studied in the natural pH of the basic dyes, as well as in the acidic and neutral pH. Isotherm (Freundlich and Langmuir) was used, and it was found that the best isotherm is Freundlich. Adsorption efficiency was calculated in the range of 15-65 oC of temperature. It was found that the adsorption efficiency decreased by increasing the temperature in the case of alizarin yellow dye adsorption on the three surfaces. Whereas the adsorption efficiency of Congo red on the clay surface decreased by increasing the temperature and this indicates that the reaction is exothermic. It has been found that the efficiency of adsorption is increased by increasing the temperature in the case of adsorption of Congo red dye on activated charcoal and bentonite surfaces and this indicates that the reaction is endothermic. The values of the thermodynamic parameters of the adsorption process and the adsorption kinetics study were calculated and found that the adsorption follows the pseudo- second order equation.

تم في هذا البحث ازالة صبغتين عضويتين هما ( الالزارين الاصفر، الكونغو الاحمر) من محاليلها المائية على ثلاثة سطوح مازة هي ( الفحم المنشط، البنتونايت، الطين المأخوذ من منطقة شوراو شمالي غرب مدينة كركوك) وتم تحديد زمن التوازن لعملية الامتزاز فوجد انه في حالة امتزاز الصبغتين على سطحي الفحم المنشط والبنتونايت تصل لحالة التوازن في مدة زمنيـة تتراوح بين70-50 min))، بينما عند امتزازهما على سطح الطين فقد وصلت الى حالة التوازن في مدة زمنيـة تتراوح بين70-60 min)) باستعمال مطياف الأشعة المرئية – فوق البنفسجية، أوضحت النتائج أن أفضل وزن للسطوح المازة هو (0.1gm) وكذلك أجريت الدراسة عند الدالة الحامضية الطبيعية وكانت كلا الصبغتين قاعديتين، تمت دراسة الأمتزاز عند الدالة الحامضية والمتعادلة. تم استعمال ايزوثيرم (فريندلش ولانكماير) أذ وجد ان افضل ايزوثيرم هو فرندلش ، كذلك تم حساب كفاءة الأمتزاز في مدى من درجات الحرارة (288-338oK) فوجد عند امتزاز صبغة الاليزارين الصفراء على السطوح الثلاثة وامتزاز صبغة الكونغو الحمراء على سطح الطين ان كفاءة الأمتزاز تقل بزيادة درجة الحرارة وهذا يبين ان التفاعل هو باعث للحرارة أما عند امتزاز صبغة الكونغو الحمراء على سطحي الفحم المنشط والبنتونايت فان كفاءة الأمتزاز تزداد بزيادة درجة الحرارة وهذا يبين ان التفاعل هو ماص للحرارة، تم حساب قيم الدوال الثرمودايناميكية لعملية الأمتزاز ودراسة حركية الأمتزاز فوجد أن الأمتزاز يتبع معادلة الرتبة الثانية الكاذبة.

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