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Article
Isotherm and pH Effect Studies of Tetracycline Drug Removal from Aqueous Solution Using Cobalt Oxide Surface

Authors: Asmaa A. Maryoosh --- Marwa A. Abed --- Dhifaf A. Abdul abass --- Ali Amer Waheb --- et al.
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2019 Volume: 22 Issue: 2 Pages: 12-18
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Tetracycline adsorption on the surface of cobalt oxide studied in this work to determine the appropriate conditions for increasing the efficiency of adsorption by changing the temperature, adsorbed dosages, concentration, contact time and pH. The results showed that the rate of adsorption decreased by increasing the temperature and concentration and at 45 minutes with 0.1 gm of Co3O4. The influence of pH on adsorption at pH (1.2, 6, 8) was studied and concentration with a linear range of (20-70 mg/l), the adsorption ratio decreased by increasing the concentration at the same pH. The point of zero charges pHzc calculated and found to be equal to 7.2. Both Langmuir and Freundlich isotherm studied. The result showed a good agreement with Freundlich linear model.


Article
Zero order and first Derivative Spectrophotometric Determination of pb(II) by Complex with N,N'-cyclohexane-l,2-diylidene-bis (4-methaxybenzoythydrazide) (CHMBH)
طريقة الترتيب الصفري والمشتقة الاولى لتقدير الرصاص باستخدام التعقيد مع ن, ن- سايكلوهيكسان-1,2-دايلادين-ثنائي(4-ميثاكسي بنزويثايدرازايد) (CHMBH)

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Abstract

In this work, two novel, accurate and reliable spectrophotometric methods have been developed for the determination of pb(II) ion by complexion with the ligand N,N'-cyclohexane-l,2-diylidene-bis(4-methaxybenzoythydrazide (CHMBH). In this study, pb(II) ion was determined by the application of Zero order and first Derivative Spectrophotometric by measuring the amplitude at 258 nm, The linearity ranges for both methods were found to be 20–55 mg/l, Limit of Detection and Quantitation were found to be 0.33 mg/l and 1 mg/l for zero order and 1.438 mg/l and 4.360 mg/l for first derivative method respectively.Both methods have good accuracy found to be 99.594% and 100.497% respectively.

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