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Article
Removal of Nickel Ions Using A Biosorbent Bed (Laminaria saccharina) Algae

Author: Firas Hashim Kamar AL-Hamadani فراس هاشم قمر
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2012 Volume: 13 Issue: 4 Pages: 47-55
Publisher: Baghdad University جامعة بغداد

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Abstract

The present study aims to remove nickel ions from solution of the simulated wastewater using (Laminaria saccharina) algae as a biosorbent material. Effects of experimental parameters such as temperature at (20 - 40) C⁰, pH at (3 - 7) at time (10 - 120) min on the removal efficiency were studied. Box-Wilson method was adopted to obtain a relationship between the above three experimental parameters and removal percentage of the nickel ions. The experimental data were fitted to second order polynomial model, and the optimum conditions for the removal process of nickel ions were obtained. The highest removal percentage of nickel ions obtained was 98.8 %, at best operating conditions (Temperature 35 C⁰, pH 5 and Time 10 min).


Article
Evaluation of Salivary Nickel and Chromium Level of Iraqi Sample Treated with Fixed Orthodontic Appliances

Author: Rehab Adil Al-rawi رحاب عادل الراوي
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2018 Volume: 6 Issue: 2 Pages: 87-91
Publisher: Tikrit University جامعة تكريت

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Abstract

As orthodontic appliances consider one of the esthetic treatment in dentistry, which contain variable amount of Nickel and Chromium in different part of the orthodontic appliance that may release in saliva and affect patient's health, the aim of the study was conducted to evaluate the nickel and chrome concentration level in saliva for orthodontic patients who are treated with nitinol and stainless steel arch wire and compare this concentration with that of control group. Three groups have been studied 1st group and 2nd experimental includes 17 patients with nitinol arch wire and other 17 patients with stainless steel arch wire. The 3rd group was control group includes 17 patients without orthodontic appliance, stimulated saliva collected in sterile screw capped bottle, and kept at (-20 C˚) then allowed to defrost at room temperature, then the concentration of salivary ions of nickel and chromium was measured by using atomic absorption spectrophotometer. Descriptive and Inferential statistical analysis has been used. Revealed significant difference in Cr and Ni concentration among three groups. This study proved that with nitinol arch wire the level of Cr and Ni increase in saliva more than that of control and stainless steel group.


Article
Preparation and Characterization of Copper Oxide Nanoparticles Used to Remove Nickel Ions from Aqueous Solution
تحضير وتشخيص اوكسيد النحاس النانوي واستخدامه لازالة ايونات النيكل من المحاليل المائية

Authors: Karim Henikish Hassan كريم هنيكش حسن --- Eman Rahman Mahdi ايمان رحمن مهدي
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2017 Volume: 13 Issue: 2 - part 2 Pages: 217-234
Publisher: Diyala University جامعة ديالى

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Abstract

In this study, copper oxide nanoparticles (CuO) was prepared by simple precipitation method and then it characterize by XRD, SEM, and AFM techniques. XRD spectrum revealed that particle size obtained was around (7.43 nm) for it, which agreed fairly well with XRD data. Surface morphology as a main nanoparticles phenomenon was studied in terms of SEM and AFM. The prepared oxide nanoparticles was used to remove nickel ions from aqueous solution and determining the best removal percentage at different contact time (30, 60, 90, and 120 min) and different initial concentration of aqueous solutions (100, 200, and 300 mg/L) with other constant condition such as pH of 3.5, adsorbent dosage (0.1g), and room temperature . The result showed the percentage removal of nickel ions increase with increase in the contact time, and the maximum adsorption was recorded with 100 mg/L for the prepared oxide nanoparticles, Also the percentage removal seem to decrease with increase in the initial concentration of adsorbate. The correlation coefficient for the linear Freundlich isotherm regression fits are larger than that for the Langmuir one for (CuO), nanoparticles, so the Freundlich model could describe the adsorption isotherm for the uptake of nickel ions from aqueous solution on(CuO), nanoparticles surfaces.

في هذه الدراسة، تم تحضير اوكسيد النحاس النانوي (CuO) باستخدام طريقة الترسيب البسيط ، و تم تشخيص خصائصه وصفاته باستخدام عدة تقنيات مثل حيود الأشعة السينية ((XRD ، ومجهر المسح الالكتروني ((SEM، ومجهر القوة الذرية ((AFM. حيث اظهرت النتائج لقياس (( XRD ان حجم الجسيمات كانت (7,43) نانومتر للاوكسيد النانوي المحضر ، وهذا ما اكدته نتائج قياسات (SEM و AFM) التي تم اجرائها.استخدم اوكسيد النحاس النانوي (CuO) المحضر تطبيقيا لإزالة ايونات النيكل من محلولها المائي وتحديد أفضل نسبة مئوية لازالة لهذه الايونات في ازمنة مختلف (30، 60، 90، و 120 دقيقة) وكذلك تراكيز محاليل مائية ابتدائية مختلفة (100، 200، و 300 ملغم / لتر) مع تثبيت الظروف الاخرى كالرقم الهيدروجيني عند 3.5، وكمية المادة المازة (الاوكسيد النانوي) كانت 1,0 غرام ، وعند درجة حرارة الغرفة (25 م̊ ).أظهرت النتائج ان نسبة إزالة ايونات النيكل تزداد مع زيادة الزمن ، وكما سجلت النتائج ان اعلى امتزاز كان عند تركيز 100 ملغم / لتر بالنسبة للاوكسيد النانوي المستخدم وهذا يدل ان نسبة الازالة تنخفض مع زيادة التركيز الابتدائي للمادة الممتزة .معامل الارتباط اظهر قيمة اكبر لايزوثرم Freundlich عند امتزاز ايونات النيكل على سطح (CuO) النانوي مقارنة بمعامل الارتباط لايزوثرم Langmuir وهذا يدل ان معادلة Freundlich تصف سلوك (CuO) النانوي عند امتصاص ايونات النيكل .

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