Ali Reza Mahjoub,
Department of Chemistry, Tarbiat Modares University, 14115-175 Tehran, I.R. IRAN
[ 1 ] - Synthesis of Spongelike Mesoporous Anatase and its Photocatalytic Properties
Mesoporous TiO2 has been prepared using a nonionic block copolymer (Pluronic P-123) as structure-directing agent with sol-gel method. Characterization of the product was carried out by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry-differential scanning calorimetry (TG-DSC), Nitrogen sorption isotherms, and UV-vis absorpti...
[ 2 ] - Preparation of Nanocomposite Heteropoly Metalate Based Graphene Oxide: Insight into Cadmium Adsorption
We developed a facile strategy for preparation of heteropoly metalate/graphene oxide nanocomposite as a new ion exchanger for cadmium ion removal from aqueous solution. The synthesized nanocomposite was characterized by X-ray powder diffraction (XRD), UV-Vis spectroscopy, FT-IR spectroscopy and Raman spectroscopy. Our findings indicated that the combination of heteropoly metalate nanoparticles ...
[ 3 ] - Facile Synthesis of Nanosized MgO as Adsorbent for Removal of Congored Dye from Wastewate
Nanostructures of magnesium oxide is one of the most attractive materials which have shown various applications in many aspects of industries. So, finding a controllable and inexpensive technique to produce desirable nanostructures of MgO is valuable. In this work, magnesium oxide (MgO) with different morphologies was successfully prepared via a simple solid-state method. The molar ratio of sod...
[ 4 ] - VISIBLE-LIGHT-ACTIVE NITROGEN DOPED TIO2 NANOPARTICLES PREPARED BY SOL-GEL ACID CATALYZED REACTION
Yellow-colored nitrogen doped TiO2 photocatalyst and a pure TiO2 powder were synthesized via sol-gel method using TiCl4 and urea as raw materials. However, the synthesis procedure for nitrogen doped TiO2 was catalyzed by acid that dialed with controlled precipitation and slow nucleation. According to XRD analysis, the nitrogen doped TiO2 consisted of anatase phase of titania which was a signifi...
[ 5 ] - بررسی اثر ناخالصی لانتانیم اکسید بر ویژگی حسگری نانو ساختار گل مانند روی اکسید
در این کار پژوهشی، روی اکسید گل مانند با روش تابش دهی امواج ریزموج، با استفاده از پیش ماده روی استات و آب به عنوان حلال تهیه شد. نمونه با استفاده از تصویرهای میکروسکوپ الکترونی و تجزیه عنصری EDX و پراش پرتو ایکس مورد شناسایی قرار گرفت. سپس حسگر به دست آمده با درصدهای متفاوت از دوپه ناخالصی، برای بررسی انتخابی گری نسبت به اتانول با غلظت ppm 500 در معرض گازهای متان، کربن مونو اکسید و اتانول قرار ...
[ 6 ] - سنتز و شناسایی نانو ذرات TiO2 دوپه شده با +La3 - بررسی شکاف انرژی و فعالیت فوتوکاتالیتیکی آن‌ها
نانو ذرات TiO2 دوپه شده با +La3 با روش سل- ژل و با استفاده از ماده‌های اولیه‌ی TiCl4 و La(NO3)3.6H2O سنتز شدند. شناسایی فراورده با استفاده از روش‌های XRD ،XRF ،SEM ،EDX ،Uv-vis ،BET-BJH انجام شد. نتیجه‌ها نشان می‌دهند که ماده‌ی سنتزی حاوی 6 درصد یون +La3 بوده و حضور فازهای آناتاز و روتیل TiO2 در کنار La2O3 تأیید شد. شکاف انرژی این ماده eV 2/5، مساحت سطح ویژه آن2m/g 59/3 و متوسط قطر حفرات آن nm ...
[ 7 ] - Synthesis and characterization of visible light active S-doped TiO2 nanophotocatalyst
S-doped and bare mesoporous TiO2 were prepared using titanium tetraisopropoxide and thiocarbamide as raw materials. Prepared materials were characterized by means of fourier transform infrared spectroscopy FT-IR, thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), UV–Vis absorption spectroscopy, Brunauer–Emmett–Teller (BET) specific surface area and Barrett–Joy...
[ 8 ] - Sulfur modified ZnO nanorod as a high performance photocatalyst for degradation of Congoredazo dye
Sol-gel derived sulfur modified and pure ZnO nanorod were prepared using zinc chloride and thiocarbamide as raw materials. Prepared nanorods were characterized by means of X-ray diffraction (XRD), thermogravimetry- differential scanning calorimetry (TG–DSC), UV- Vis absorption spectroscopy, Brunauer Emmett Teller (BET) specific surface area and Barrett Joyner Halenda (BJH) pore size distributio...
[ 9 ] - اثر افزودنی‌های متفاوت بر ویژگی‌های حسگری قلع دی‌اکسید
امروزه با توجه به آلودگی هوا ناشی از دود ماشین‌ها و کارخانه‌ها باید تمهیداتی برای آشکارسازی و پایش انتشار این ترکیب‌های آلوده‌کننده اندیشید. یکی از روش‌های آشکارسازی این ترکیب‌ها استفاده از حسگرهای اکسید فلزی نیم‌رسانا است. این حسگرهای گازی اکسید فلزی برای تشخیص گازها در کاربردهای خانگی، تجاری و صنعتی دارای مزایای بسیاری ازجمله هزینه کم و تولید آسان هستند. به هرحال، کارایی این حسگرها به عوامل م...
[ 10 ] - Aliphatic alcohols oxidation with Hydrogen Peroxide in water catalyzed by supported Phosphotungstic acid (PTA) on Silica coated MgAl2O4 nanoparticles as a recoverable catalyst
In this paper, a novel catalyst (MgAl2O4@SiO2-PTA) was proposed for the green oxidation of aliphatic alcohols. The resultant composite was characterized by different techniques, such as X-ray diffraction (XRD), SEM, FT-IR, EDX and Brunauer-Emmett-Teller (BET) surface area analysis. The prepared nanocomposite was used as a catalyst for oxidation of aliphatic alco...
[ 11 ] - Aliphatic alcohols oxidation with Hydrogen Peroxide in water catalyzed by supported Phosphotungstic acid (PTA) on Silica coated MgAl2O4 nanoparticles as a recoverable catalyst
In this paper, a novel catalyst (MgAl2O4@SiO2-PTA) was proposed for the green oxidation of aliphatic alcohols. The resultant composite was characterized by different techniques, such as X-ray diffraction (XRD), SEM, FT-IR, EDX and Brunauer-Emmett-Teller (BET) surface area analysis. The prepared nanocomposite was used as a catalyst for oxidation of aliphatic alco...
[ 12 ] - Synthesis and characterization of visible light active S-doped TiO2 nanophotocatalyst
S-doped and bare mesoporous TiO2 were prepared using titanium tetraisopropoxide and thiocarbamide as raw materials. Prepared materials were characterized by means of fourier transform infrared spectroscopy FT-IR, thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), UV–Vis absorption spectroscopy, Brunauer–Emmett–Teller (BET) specific surface area and Barrett–Joy...
[ 13 ] - Sulfur modified ZnO nanorod as a high performance photocatalyst for degradation of Congoredazo dye
Sol-gel derived sulfur modified and pure ZnO nanorod were prepared using zinc chloride and thiocarbamide as raw materials. Prepared nanorods were characterized by means of X-ray diffraction (XRD), thermogravimetry- differential scanning calorimetry (TG–DSC), UV- Vis absorption spectroscopy, Brunauer Emmett Teller (BET) specific surface area and Barrett Joyner Halenda (BJH) pore size distributio...
[ 14 ] - Preparation, characterization and photocatalytic degradation of congo red by ZnZrO3/ZnO/ZrO2
Un-doped and Cd-doped ZnZrO3/ZnO/ZrO2 nano composites (CDZZ-NCPs) (CD0-4) were synthesized by the hydrothermal method. The nano composites were characterized by various techniques such as Fourier Transform Infra-Red spectroscopy (FT-IR), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive X-Ray Analysis (EDS). The photocatalytic properties of CDZZ...
[ 15 ] - Synthesis and characterization ZnFe2O4@MnO and MnFe2O4@ZnO magnetic nanocomposites: Investigation of photocatalytic activity for the degradation of Congo Red under visible light irradiation
In the present investigation, ZnFe2O4@MnO and MnFe2O4@ZnO magnetic nanocomposites were fabricated via a facile hydrothermal method and were calcined at 300 °C for 3 h. Synthesis of ZnFe2O4@MnO and MnFe2O4@ZnO magnetic nanocomposites optimized by the different weight percentages. The synthesized photocatalyst...
[ 16 ] - Synthesis and characterization of Mg1-xNixAl2O4 and their photocatalytic behaviors towards Congo red under UV light irradiation
In this paper, MgAl2O4 nanoparticles were synthesized by the Sol-gel auto combustion method and were doped with different concentrations of Ni2+ (x= 0, 0.1, 0.05, and 0.03). By this method, a novel photocatalyst which had better decolorization percentages of Congo redcompared to MgAl2O4 was produced. The MgAl2O4 sample...
نویسندگان همکار
A. Bayat 4