مقالههای Elham Moniri
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: سومین همایش ملی کاربردهای شیمی در فناوریهای نوین، سال ۱۳۹۲
تعداد صفحات: ۵
Sepharose was chemically modified simply and rapidly by coupling with cyclodextrin and characterized byFourier transform infrared spectroscopy and studied for the sorption and interaction with famotidine. Theoptimum pH value for sorption of famotidine was 5. The sorption capacity of resin for famotidine wasdetermined. The modified sepharos can be reused for 20 cycles of sorption–desorption without anysignificant change in sorption capacity. The profile of the famotidine uptake by the modified sepharosreflected good accessibility of the interacted sites in the sorbent.<\div>
۲FABRICATION OF NANOGRAPHENE BY NEW METHOD SEPARATION OF TRACE AMOUNTS OF MO2+ IN WATER SAMPLES USING
اطلاعات انتشار: سومین کنفرانس بین المللی نفت، گاز و پتروشیمی، سال ۱۳۹۴
تعداد صفحات: ۱۴
A new sensitive and simple method was developed for the preconcentration of trace amounts of Mo using 1–(2–pyridylazo)–2–naphthol (PAN) as chelating reagent prior to its determination by flame atomic absorption spectrometry. The proposed method is based on the utilization of a column packed with graphene as sorbent. Several effective parameters on the extraction and complex formation were selected and optimized. Under optimum conditions, the calibrationgraph was linear in the concentration range of 5.0–240.0 μg L–1 with a detection limit of 0.36 μg L–1. The relative standard deviation for ten replicate measurements of 20.0 and 100.0 μg L–1 of Mo were 3.45 and 3.18%, respectively. Comparative studies showed that graphene issuperior to other adsorbents including C18 silica, graphitic carbon, and single– and multi–walled carbon nanotubes for the extraction of Mo. The proposed method was successfully applied in the analysis of four real environmental water samples good spiked recoveries over the range of 95.8–98.6% were obtained<\div>
۳Preconcentration and Determination of Chromium (III) from Sea Water Samples Using Ion Imprinted Activated Carbon
اطلاعات انتشار: International Journal Of Bio-Inorganic Hybrid Nanomaterials، اول،شماره۳، Autumn۲۰۱۲، سال ۰
تعداد صفحات: ۷
A simple ion imprinted amino–functionalized sorbent was synthesized by coupling activated carbon with iminodiacetic acid, a functional compound for metal chelating, through cyanoric chloride spacer. The resulting sorbent has been characterized using Fourier transform infrared spectroscopy (FT–IR), elemental analysis, thermogravimetric analysis (TGA) and evaluated for the preconcentration and determination of trace Cr(III) in environmental water samples. The optimum pH value for sorption of the metal ion was 6. The sorption capacity of functionalized sorbent was 32.36 mg.g–1. The chelating sorbent can be reused for 10 cycles of sorptiondesorption without any significant change in sorption capacity. A recovery of 104% was obtained for the metal ion with 0.5 M nitric acid as eluting agent. The equilibrium adsorption data of Cr(III) by modified resin were analyzed by Langmuir, Freundlich, Temkin and Redlich–Peterson models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined as 0.048 (L\mg), 2.849 (mg\g) (L\mg)1\n and 2.124 (L\g), respectively at 25°C.
اطلاعات انتشار: International Journal Of Bio-Inorganic Hybrid Nanomaterials، اول،شماره۴، winter ۲۰۱۳، سال ۰
تعداد صفحات: ۵
Poly urea–formaldehyde was synthesized simply and rapidly from urea and formaldehyde by condensation polymerization and studied for the sorption of trace acid blue from aqueous solution. The optimum pH value for sorption of the acid blue was 4. Experimental results showed that the sorption capacity of poly urea–formaldehyde for acid blue was determined. The synthetic polymer can be reused for 5 cycles of sorption–desorption without any significant change in sorption capacity. The equilibrium adsorption data of acid blue on poly urea–formaldehyde were analyzed by Langmuir models. Based on equilibrium adsorption data the Langmuir constants were determined about 19 L.mg–1 at pH 4 and 20°C.
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