فهرست مقالات Metal ion

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  1 - Thermodynamic study of interaction between some transition metal ions and L-Alanine
  H. Aghaie K. Zare F. Keshavarz Rezaei
  Using UV-vis spectrophotometic method, the formation constants for interaction of Cd2+(aq) andCo2+(aq) ions with L-Alanine were experimentally studied at pH = 4.1 ± 0.01 (50mM of potassiumhydrogen phthalate buffer), ionic strength of 0.1M potassium nitrate and at چکیده کامل

  Using UV-vis spectrophotometic method, the formation constants for interaction of Cd2+(aq) andCo2+(aq) ions with L-Alanine were experimentally studied at pH = 4.1 ± 0.01 (50mM of potassiumhydrogen phthalate buffer), ionic strength of 0.1M potassium nitrate and at 5 differenttemperatures 15,20, 25,30 and 35°C. The optical absorption spectra of mixtures containingconsidered cations and L-Alanine were analyzed by using SQUAD software, in order to obtainthe formation constants and the stoichiometry of respect complexes. The best fitting of our resultsshowed that the 2:1 complex respect to each studied system (Cd2+(aq) + L-Alanine) and (Co2+(aq) +L-Alanine) is formed. Regarding the values of formation constants at different temperatures andusing Van't Hoff equation, enable us to calculate the respect thermodynamic functions offormation such as ΔH , ΔS , ΔG , … of studied complexes. پرونده مقاله
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  2 - Thermodynamic Study on the Interaction between Fe2+(aq) ion and LAlanine
  K. Zare F. Keshavarz Rezaie F. Soleimani H. Aghaie
  Using UV-VIS spectrophotometric method, the formation constant for interaction of Fe2+(aq) ion with L-Alaninewas experimentally studied at pH = 4.1 ± 0.01 (50mM of potassium hydrogen phthalate buffer), ionic strengthof 0.1M potassium nitrate and at 5 different te چکیده کامل

  Using UV-VIS spectrophotometric method, the formation constant for interaction of Fe2+(aq) ion with L-Alaninewas experimentally studied at pH = 4.1 ± 0.01 (50mM of potassium hydrogen phthalate buffer), ionic strengthof 0.1M potassium nitrate and at 5 different temperatures 15,20, 25,30 and 35 T. The optical absorption spectraof mixtures containing considered cation and L-Alanine were analyzed by using SQUAD software, in order toobtain the formation constant and the stoichiometry of respect complex. The best fitting of our results showedthe 1:2 complex respect to the studied system (Fe2+00 + L-Alanine) is formed. Regarding the value of formationconstants at different temperatures and using Van' t Hoff equation, it is possible to calculate the respectivethermodynamic functions of formation such as AG', An' , AS', ... of the studied complex. پرونده مقاله
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  3 - Effective Removal of Heavy Metal Ions Zn2+, Ni2+, Cu2+, Cr3+ from Aqueous Solution by Synthetic Superabsorbent Polymer
  Mehdi Hosseinzadeh Farideh Mahmoodzadeh
  Heavy metal pollution is propagating throughout the world with the enlargement of industrial activities. The elimination of heavy metal ions from industrial wastewaters has drawn much attention because of the hazardous effects of the heavy metal ions on different organi چکیده کامل

  Heavy metal pollution is propagating throughout the world with the enlargement of industrial activities. The elimination of heavy metal ions from industrial wastewaters has drawn much attention because of the hazardous effects of the heavy metal ions on different organisms. According to these facts, poly (2, 2, 3, 3- tetracyanocyclopropyl) phenyl acrylate (PTCP) with multi cyanocyclopropane functionalities in the pendant group were prepared by reacting benzoyl peroxide with p-(2,2,3, 3-tetracyanocyclopropyl) phenylacrylate (TCP) monomer. (TCP) monomer was synthesized by reacting cyanogen bromide and malononitrile with p-acryloyloxybenzaldehyde at 0 °C in a short time. The synthesized PTCP momopolymer were examined in heavy metal ions adsorption such as Ni (II), Cu (II), Cr (III) and Zn (II) under competitive and non-competitive conditions in aqueous solutions at different pH. The high adsorption rate (<65 min) was seen. The synthesized polymer and its metal chelates were investigated by thermogravimetric analysis (TGA),Fourier-transform infrared spectroscopy (FT-IR), atomic absorption techniques (AAS), UV-vis spectroscopy and scanning electron microscopy (SEM). پرونده مقاله
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  4 - Synthesis of Polyvinyltetrazole by Combination of Free Radical Polymerization and Click Chemistry for Adsorption of Pb (II) in Aqueous Solution
  Mehdi Hosseinzadeh Farideh Mahmoodzadeh
  Polyvinyltetrazole (PVT) is produced from acrylonitrile (AN) monomer by using free-radicalpolymerization and Click Chemistry methods. The resulting polymer with a broad range of tetrazolegroup contents was conveniently synthesized through [3+ 2] azide-nitrile cycloaddit چکیده کامل

  Polyvinyltetrazole (PVT) is produced from acrylonitrile (AN) monomer by using free-radicalpolymerization and Click Chemistry methods. The resulting polymer with a broad range of tetrazolegroup contents was conveniently synthesized through [3+ 2] azide-nitrile cycloaddition reaction ofnitrile-containing polymer with sodium azide in DMF. The prepared PVT was characterized by13CNMR,FT-IR and UV-Vis spectroscopies. Elemental analysis indicated that approximately 92% ofthe cyano groups on the polymer surface were converted to tetrazolyl groups. The PVT exhibitedexcellent adsorption form et al ions and the maximum adsorption capacity for Pb (II) was2.39mmol/g which are much higher than corresponding literature results. The adsorption processwas described as an ion exchange and chelation interaction mechanisms. The high adsorption rate(<40 min) was seen. The resulting polymer and its metal chelate were characterized by FT-IR,elemental analysis, gravimetry, scanning electronic microscopy (SEM), thermogravimetry analysis(TGA), UV-Vis spectroscopy, and atomic absorption techniques (AAS). All these analyses methodsconfirmed the presence of metal in the polymer-metal complex. پرونده مقاله
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  5 - مروری بر حذف یون های فلزات سمی توسط هیدروژل‌های پلیمری
  محراب فلاحی سامبران سمانه خدادادی
  امروزه تحقیقات پیوسته و پژوهش‌های گسترده‌ای در دنیا برای سنتز انواع جاذب‌های نوین، جهت حذف فلزات سمی با ظرفیت جذب یونی بالا به همراه ماهیت غیر سمی و خواص زیست تخریب پذیری در حال انجام است. تا کنون ناخالصی‌های مختلفت یونی به طرق مختلف حذف شده‌اند. ظرفیت جذب و عملکرد بالا چکیده کامل

  امروزه تحقیقات پیوسته و پژوهش‌های گسترده‌ای در دنیا برای سنتز انواع جاذب‌های نوین، جهت حذف فلزات سمی با ظرفیت جذب یونی بالا به همراه ماهیت غیر سمی و خواص زیست تخریب پذیری در حال انجام است. تا کنون ناخالصی‌های مختلفت یونی به طرق مختلف حذف شده‌اند. ظرفیت جذب و عملکرد بالا، خواص آب دوستی، قابلیت احیاء و غیرسمی بودن، هیدروژل‌ها را به رقیب خوبی برای حذف آلاینده‌های مختلف آبزی از جمله یون‌های فلزات سنگین تبدیل کرده است. هیدروژل‌ها دارای ساختارهای متخلخل، سه بعدی و گروه‌های عاملی شیمیایی حساسی هستند که آنها را قادر می سازد تا به راحتی یون‌های فلزی و رنگ‌ها را از فاضلاب گرفته و این آلاینده‌های سمی را با تغییر در شرایط محلول آبی آزاد کنند. ویژگی آبدوست جاذب‌های هیدروژل باعث می‌شود که شبکه‌ای انعطاف پذیر از زنجیره‌های پلیمری تشکیل شود که به مولکولهای آلاینده اجازه می‌دهد تا به سرعت با آب به شبکه نفوذ کرده و کمپلکس‌های پایدار با گروه‌های عاملی را تشکیل دهند. آنها پلیمرهای آبدوست سه بعدی هستند که مقادیر زیادی آب را جذب می‌کنند و متورم می‌شوند تا یک ژل جامد تشکیل دهند و در عین حال ساختار فیزیکی خود را بدون حل شدن حفظ کنند. به دلیل پتانسیل بالایی که آنها برای حذف موثر فلزات سنگین و رنگ‌ها دارند برای تصفیه آب و فاضلاب بسیار مناسب هستند. مقاله حاضر پیشرفت‌های اخیر در تصفیه آب و فاضلاب توسط هیدروژل‌ها و انتخاب‌پذیری، کارایی و قابلیت استفاده مجدد هیدروژل‌ها در این زمینه را مورد بحث و بررسی قرار می‌دهد. پرونده مقاله
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  6 - حذف یون‌های فلزات سنگین از آب‌های آلوده با استفاده از جاذب‌های بر پایه هیدروژل
  محراب فلاحی سامبران طناز سلطان الذاکرین سرخابی
  رشد صنعت امروز نیازهای ما را برآورده می‌کند و باعث بهبود توسعه اقتصادی می‌شود. با این حال، آلاینده‌‌های صنایع باعث آلودگی منابع آبی می‌شوند که خطر بزرگی برای سلامت موجودات زنده محسوب می‌شود. بنابراین محققان همواره در تلاش بوده‌اند تا روشی کارآمد و موثر تری برای حذف یون‌ چکیده کامل

  رشد صنعت امروز نیازهای ما را برآورده می‌کند و باعث بهبود توسعه اقتصادی می‌شود. با این حال، آلاینده‌‌های صنایع باعث آلودگی منابع آبی می‌شوند که خطر بزرگی برای سلامت موجودات زنده محسوب می‌شود. بنابراین محققان همواره در تلاش بوده‌اند تا روشی کارآمد و موثر تری برای حذف یون‌های سمی فلزات سنگین از منابع آبی توسعه دهند. روش جذب سطحی، نتایج امیدوار کننده‌ای را برای حذف یون‌های فلزات سنگین از خود نشان می‌دهد. به کار گیری این روش در مقیاس بزرگ نیز آسانتر است. بنابراین می‌تواند در کاربردهای عملی به کار گرفته شود. جاذب‌های متعددی توسعه و گزارش شده‌اند. اما در میان آن‌ها هیدروژل‌ها به دلیل قابلیت استفاده مجدد و سهولت تهیه و مصرف، توجهات زیادی را امروزه به خود جلب کرده است. هیدروژل‌ها شبکه‌های ماکرومولکولی هستند که در آب متورم می‌شوند ولی در آب حل نمی‌شوند. قابلیت تورم و جذب آب هیدروژل‌ها عمدتا از گروه‌های عاملی آبدوستی مانند -NH2 ، -OH ، -COOH، -CONH2 ، - CONH و -SO3H ناشی می‌شوند که به زنجیر اصلی پلیمری متصل هستند. در حالی که مقاومت آنها در برابر حل شدن ناشی از پیوندهای عرضی بین زنجیرهای شبکه ناشی می‌شود. بنابراین، در این مقاله روش‌های مختلف تهیه جاذب‌های هیدروژلی توضیح داده شده و به طور خلاصه پیشرفت‌های اخیر در استفاده از جاذب‌های هیدروژل برای حذف یون‌های فلزات سنگین آورده شده است. علاوه ‌براین، مکانیسم مربوط به حذف یون‌های فلزات سنگین نیز بررسی و جدیدترین مطالعات در مورد روش جذب سحطی برای تصفیه آب‌های آلوده به یون‌های فلزات سنگین ارائه شده است. پرونده مقاله
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  7 - Heavy metals removal from wastewater by using different kinds of magnetite nanoadsorbents: effects of different organic and inorganic coatings on the removal of copper and lead ions
  Hadi Baseri saeed Tizro
  Co-precipitation procedure was applied in order to obtain different kinds of magnetic nanoadsobents for the removal of Pb(II) and Cu(II) toxic metal ions from wastewater samples. Prepared nanoadsorbents were characterized by Fourier transform infrared spectroscopy (FT-I چکیده کامل

  Co-precipitation procedure was applied in order to obtain different kinds of magnetic nanoadsobents for the removal of Pb(II) and Cu(II) toxic metal ions from wastewater samples. Prepared nanoadsorbents were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The average sizes of these nanoparticles were found to be about 15 to 35 nm. Adsorption studies of heavy metal ions were carried out by batch experiments. pH, temperature, contact time and adsorbent dose were studied as the factors that effecting the adsorption of heavy metal ions on the surface of magnetic nanoadsorbents. The optimized values for pH, temperature, contact time and adsorbent dose were 10, 313 K, 50 min and 0.2 g, respectively. Also the maximum amounts of removal efficiency for pb2+ and Cu2+ ions was 98%. Thermodynamic parameters reveal the feasibility and spontaneity nature of the adsorption process and the adsorption kinetics of pb(II) and Cu(II) ions follow a pseudo-second-order kinetic model. پرونده مقاله
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  8 - Removal of Cd2+ and Zn2+ from industrial wastes using novel magnetic N2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide nanoadsorbent
  Kiomars Zargoosh Mohammad Rasoul Sohrabi Amir Abdolmaleki Kourosh Firouz
  10.22034/jna.2015.1.003
  In this workN2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide (DPD), was synthesized via reaction of 2-aminothiazole and 2,6- pyridinedicarboxylic acid in n-methylpyrrolidine. The obtained (DPD) was characterized with nuclear magnetic resonance spectroscopy (NMR), Fourie چکیده کامل

  In this workN2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide (DPD), was synthesized via reaction of 2-aminothiazole and 2,6- pyridinedicarboxylic acid in n-methylpyrrolidine. The obtained (DPD) was characterized with nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared (FT-IR) spectroscopy, and elemental analysis. Finally, a novel magnetic nanoadsorbent was synthesized by modification the surface of Fe3O4 nanoparticles by N2,N6-di(thiazol-2-yl)pyridine-2,6-dicarboxamide. The prepared magnetic nanoadsorbent was successfully used for removal of Zn2+ and Cd2+ ions from industrial wastes and the effects of the affecting parameters such as pH, possible interfering ions, contact time, concentration of target ions, background electrolytes and temperature were investigated. The maximum adsorption capacities of Zn2+ and Cd2+ were found to be 149.2 and 112.4 mg g−1, respectively. The required times for quantitative removal of Zn2+ and Cd2+ were 30 and 45 min, respectively. Appropriate characteristics of the proposed nanoadsorbent such as high adsorption capacity, stability, reusability, easy synthesis and easy separation, make it suitable adsorbent for practical removal of Zn2+ and Cd2+ ions from industrial wastes. پرونده مقاله
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  9 - Novel ZrO2+ Ion-selective Electrode Based on a Hexa Cosine Compound in PVC Matrix
  مسعود گیاهی خورشید مهدی زاده نیلوفر رفیع زاده زعیم
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  10 - Synthesis and application of chelating resins based on polyacrylonitrilediethylenetriamine for metal ions removal
  Nasser Arsalani Elnaz Ghasemi Roghayeh Rakh Ali Akbar Entezami
  Chelating resins based on polyacrylonitrile and diethylenetriamine (PAN-DTA) wereprepared through the simple reaction of polyacrylonitrile with various volume percents ofdiethylenetriamine (DTA), (25, 50, 75 and 100). The prepared resins were applied to removeheavy meta چکیده کامل

  Chelating resins based on polyacrylonitrile and diethylenetriamine (PAN-DTA) wereprepared through the simple reaction of polyacrylonitrile with various volume percents ofdiethylenetriamine (DTA), (25, 50, 75 and 100). The prepared resins were applied to removeheavy metal ions such as Cu(II), Zn(II) and Cd(II) from aqueous solutions. The sorptionbehaviors of the resins for these metal ions were found to be greater at higher solution pH values.Highest sorption on PAN-DTA was determined as 5 mmol g-1 for Cu(II). The number of aminegroups present in the resin (amine capacity) is depended on the volume percent of DTA and themaximum capacity was obtained 6.25 mmol g-1. The resins and their metal complexes have beenstudied by FT-IR spectroscopy, scanning electronic microscopy (SEM) and thermogravimetryanalysis (TGA). All these analyses methods confirmed the presence of metal in the metal-resincomplexes. پرونده مقاله
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  11 - Spectrophotometric simultaneous determination of nickel, cobalt and copper by orthogonal signal correction–partial least squares
  Shayessteh Dadfarnia Masoud Rohani Moghadam Ali Mohammad Haji Shabani Jahanbakhsh Ghasemi
  A method for the simultaneous spectrophotometric determination of nickel, cobalt and copper based on theformation of their complexes with 2-(2-Thiazolylazo)-p-Cresol (TAC) in micellar media of Triton X-100 isproposed. The absorbance spectra were recorded in the range of چکیده کامل

  A method for the simultaneous spectrophotometric determination of nickel, cobalt and copper based on theformation of their complexes with 2-(2-Thiazolylazo)-p-Cresol (TAC) in micellar media of Triton X-100 isproposed. The absorbance spectra were recorded in the range of 500 to 800 nm. The linear concentrationrange for nickel, cobalt and copper in solution calibration sets were 0.05–1.80, 0.10–6.41 and 0.10–6.54μg/ml, respectively. The effects of experimental parameters such as pH, time, concentration of ligand andsurfactant on the sensitivity of method were investigated. The data obtained from the experiments wereprocessed by the partial least squares (PLS), orthogonal signal correction-partial least squares (OSC-PLS)and principle component-back propagation artificial neural network (PC-BPANN). A set of syntheticmixtures of nickel, cobalt and copper was evaluated and the results obtained by each chemometricapproaches were compared with different testing methods. The OSC-PLS method was selected becauseafforded better results than the others. The method was satisfactorily applied for determination of nickel,cobalt and copper in alloy samples. The accuracy was determined using comparing the results to thereference values and also independent analysis by flame atomic absorption spectrometry. پرونده مقاله
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  12 - Semi-pilot Scale Biological Removal of Metals and Sulfate from Industrial AMD in Fluidized-bed Reactor
  Enayat Afsar Arezoo Nejaei Mohammad Mosaferi
  10.22034/ap.2023.1975156.1140
  Acidic mine drainage (AMD) contains large amounts of heavy metal ions and SO42, which can pose serious risks to human and environmental health. Anaerobic bioreactors are considered to be suitable methods for the treatment of acidic effluents due to some advantages such چکیده کامل

  Acidic mine drainage (AMD) contains large amounts of heavy metal ions and SO42, which can pose serious risks to human and environmental health. Anaerobic bioreactors are considered to be suitable methods for the treatment of acidic effluents due to some advantages such as the need for a small area, easy control, and simultaneous removal of sulfate and metals even in low concentrations. In this study, sulfate-reducing bacteria (SRB) performance was investigated in a semi-pilot scale down-flow fluidized-bed (DFFB) anaerobic reactor for SO42- and metals removal from the Sungun copper tailings AMD. The results indicated that utilizing SRB in the DFFB anaerobic bioreactor was an efficient, cost-effective, and environmentally friendly method for the treatment of effluents containing large amounts of SO42- and metals. All contaminants except Cr showed more than 70% removal after 24 h. The SO42- and Cu which had the highest initial concentrations showed removal efficiencies of 98.64% and 98.75%, respectively. Besides the removal of hazardous contaminants, the alkalinity of effluent increased remarkably. Also, the SRB had acceptable stability even after six consecutive cycles due to using AC granules as a support in the reactor which is an important parameter in industrial applications. پرونده مقاله