کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
627247 | 1455460 | 2008 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of fig leaf extract as a novel environmentally friendly antiscalent for CaCO3 calcareous deposits
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Mineral scales were deposited from a CaCl2 brine solution (0.7 M NaCl, 0.0025 M NaHCO3, 0.028 M Na2SO4 and 0.01 M CaCl2) by cathodic polarization of the steel surface to â0.9 V (vs. SCE) at 40°C. Nucleation, crystal growth and total coverage of the surface regions were characterized by different impedance behaviour. The effect of fig leaves (Ficus carica L.) extract as an antiscalent in an alkaline CaCl2 brine solution was studied using chronoamperometry, electrochemical impedance spectroscopy (EIS) techniques and conductivity measurements, in conjunction with microscopic examination. EIS measurements were carried out at the open circuit potential and â0.9 V (vs. SCE) to investigate the antiscale function of the extracts of fig leaves. The surface area occupied by the scale deposits decreases with increasing fig leaf extract concentrations and the critical concentration required to inhibit scale formation was 75 ppm. Fig leaf extract was found to impede CaCO3 supersaturation and increase the time of nucleation. The data indicated that fig leaf extract could be used safely as an antiscalent.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 230, Issues 1â3, 30 September 2008, Pages 314-328
Journal: Desalination - Volume 230, Issues 1â3, 30 September 2008, Pages 314-328
نویسندگان
A.M. Abdel-Gaber, B.A. Abd-El-Nabey, E. Khamis, D.E. Abd-El-Khalek,