A new mixed metal–organic framework [Zn0.5 Cd0.5 (NH2BDC) (4-bpmbp)].2DMF (NH2BDC = 2-amino terephthalate; 4-bpmbp = N4, N4'-bis (pyridine-4-ylmethylene)-biphenyl-4,4'-diamine DMF = N,N-dimethylformamide) (Zn-Cd-MOF) has been synthesized under solvothermal conditions using Cd2+ and Zn2+ salt, NH2BDC as a rigid ligand and 4-bpmbp as Pillar Ligand. The material was characterized by Fourier transform infrared (FT-IR), powder X-ray diffraction (PXRD), and inductively coupled plasma (ICP) techniques. Furthermore, the catalytic behavior of Zn-Cd-MOF toward the Knoevenagel condensation reaction was investigated and good catalytic capability was achieved. تفاصيل المقالة

Magnetic nanocomposites have the ability to remove water pollutants such as dyes, oils and organic solvents. In this study, NiFe2O4/sawdust nanocomposite was synthesized for removing oil pollutants. The oil-adsorbing nanocomposite could be easily separated from water by magnet bar. The XRD results show tetragonal phase proving the composite formation. The FESEM pictures successfully reveal the growth of NiFe2O4 on the sawdust template. The FTIR bands at 422 cm-1 and 615 cm-1correspond to the metal oxygen stretching band. VSM hysteresis loop proves the superparamagnetism of the composite. In addition contact angle depicts hydrophobic properties of the resulted nanocomposite. More importantly, as-prepared nanocomposite exhibited high oil adsorption capacity and good reusability. Our studies show easy synthesis and fast method for oil removal from water. Facile synthesis procedure, high oil adsorption capacity, fast and simple magnetic separation and reusability of nanoadsorbent are among the benefits of these composite. This approach will open up new fields of studies in polluted-water treatment. تفاصيل المقالة

In this study, CeO2 hollow spherical nanoparticles, CeO2/SiO2 @ CeO2 core/shell composites, and hollow CeO2/SiO2 sensors were synthesized and their microstructures were researched by FT-IR, XRD, FESEM, EDX and BET analyses. The peaks observed in the FT-IR spectra of the synthesized samples corresponded to Ce-O stretching vibration (ca. 566 cm-1) and O-Si-O bending vibration (ca. 470 cm-1). XRD diffraction patterns showed peaks at 2θ values in the 28.95° , 33.74°, 47.75° , 57.04°, 59.52° ,and 69.4° confirming cubic phase of CeO2. The FESEM images showed that the particle shape was approximately spherical. The results of BET showed that, surface area of the CeO2 hollow spherical nanoparticles, CeO2/SiO2 @ CeO2 and hollow CeO2/SiO2 core/shell particles were 102.78 m2/g, 80.49 m2/g, and 119.71 m2/g, respectively. The nanosized metal oxides were used to quantitatively and qualitatively identify 1-propanol, 2-propanol, ethanol and methanol. The results showed that, the hollow CeO2/SiO2 core/shell was of larger potentials for qualitative identification of 1-propanol and quantitative measurement of 2 -propanol and ethanol. تفاصيل المقالة

In this investigation the interaction of cis-PtCl2(NH3)2 complex and graphene were investigated with MPW1PW91 method in gas and solvent phases. The solvent effect were examined by the self-consistent reaction field theory (SCRF) based on Polarizable Continuum Model (PCM). The selected solvents were chloroform, chlorobenzene, bromoethane, dimethyldisulfide, and dichloroethane. The solvent effect on the frontier orbital energy and HOMO-LUMO gap were studied. Negative value solvation energy of the between cis-Pt(NH3)2Cl2 …. graphene complex signifies the more stability of the complex in solution in compared to gas phase.The characterization of the interaction between two fragments was clarified with energy decomposition analysis (EDA). Pt-C(Graphene) and H(NH3)...C(Garaphen) interactions in the graphene … cis-PtCl2(NH3)2 complex were analyzed using quantum theory of atoms in molecules analysis (QTAIM). cis-Pt(NH3)2Cl2 and graphene fragments contribute in HOMO and LUMO of complex, respectively.In the basis of QTAIM analysis, the characteristics of the Pt…C(Graphene) and H(NH3)… C(Graphene) interactions was intermediate between closed-shell and shared interactions.EDA and structural parameters predict stronger interaction between cis-Pt(NH3)2Cl2 and graphene in gas phase. تفاصيل المقالة

The purpose of this study was to investigate the efficiency of clinoptilolite modified with magnetic CoFe2O4nanoparticles as an adsorbent in the removal of nitrate from aqueous solutions. Clinoptilolite and clinoptilolite/CoFe2O4werecharacterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) analysis and Barrett-Joyner-Halenda (BJH), and vibrating sample magnetometer (VSM) techniques. The average particle size calculated by the Debye–Scherrer for clinoptilolite and clinoptilolite/CoFe2O4 were about 31 nm and 42 nm, respectively.Based on the (SEM) results,the average particle size was comparable with the Debye Scherrer calculated crystallite size. BET shows that the surface area increased from 18.42 to 25.95 m2 g-1 by the modified clinoptilolite surface. The clinoptilolite/CoFe2O4 has saturation magnetization 0.97 emu/g.Thenitrate adsorption capacity was evaluated by clinoptilolite and clinoptilolite/CoFe2O4.Based on the results, the adsorption capacity of the clinoptilolite/CoFe2O4had a higher adsorption capacity than the unmodified clinoptilolitewhich can be attributed to its higher surface area.The effect of different variables on the nitrate removal process, such as temperature, time and mass of adsorbent, was optimized using the surface response methodology (RSM) with the Box-Behnken(BBD) method. The study showed that the maximum removal percentage of nitrate was 97.03% at 55 °C, 40.36 h, and 0.27 g mass of adsorbent. تفاصيل المقالة

This study developed a novel silica-coated magnetic nanoparticle (Fe3O4@SiO2@Cu BTC) based on a metal-organic framework (MOF) for targeted anticancer medication delivery. Using a co-precipitation method, the Fe3O4@SiO2 core was coated with Cu(OH)2 shell, which was then converted to CuBTC in a hydroethanolic mixture. Finally, a post-synthetic approach was used to manufacture a 3-(mercaptopropyl) trimethoxysilane functionalized Fe3O4@SiO2@Cu BTC nanocomposite. The resulting material is characterized using SEM-EDX, TEM, VSM, XRD, TGA, BET, UV–Vis, and FTIR techniques. TEM and SEM micrographs confirmed the core-shell structure. The resulting nanocomposite has high thermal stability, according to TGA findings. Because of their great biocompatibility and drug loading capability, coated Fe3O4@SiO2@Cu BTC nanoparticles might be perfect for drug delivery. Capecitabine (CAP), an anticancer medication, was successfully dispersed through MOF pores. The acquired data revealed that 91 percent of the CAP was adsorbed on the constructed framework, and that the release of capecitabine in PBS buffer solution (pH 5.7) at 37 °C took up to 60 hours to complete. The findings show that nano-sized MOFs-based magnetic NPs with high drug loading and acceptable biocompatibility are viable options for targeted drug delivery. تفاصيل المقالة

In this study, Sr Gdx Fe(12 –x) O19 nanostructures (x= 0, 0.2(3% Gd), 0.4 (6%Gd),0.6(9%Gd), 0.8 (12%Gd)) were synthesized by self-combustion sol-gel method and then calcined at the temperature of for 3 h. This compound was then composited with functionalized graphene oxide (GO) for the photocatalytic degradation of Enrofeloxacin. FESEM, EDS, XRD, and FTIR analysis were employed to investigate the particle size, elemental composition, morphological structure, functional groups determination and structural composition of the samples. VSM, BET-BJH, TGA-DTA, DRS and zeta potential analysis were also used to assess the magnetic properties, surface area, thermal stability, band-gap determination and suspension stability of the specimens, respectively. For evaluation of performance, photocatalytic degradation of Enrofeloxacin (an antibiotic that is widely used for domestic animals) is performed. The results showed that the 3% and 6% Gd-doped composites had the highest efficiencies in the photocatalytic reaction.This research reports the successful synthesis of SrGdxFe12-xO19/GO-COOH composites and its characterization by various techniques. The results indicated that SrGdxFe12-xO19/GO-COOH composite can be employed as an applicable candidate for the photodegradation of ENR antibiotic drug from pharmaceutical industry effluent as well as the water resources. Analysis of the results by statistical software based on the response surface method showed that the prolongation of the radiation time and catalyst mass, as well as pH reduction, can enhance the efficiency of ENR photodegradation. By increasing the pollutant concentration, however, the degradation efficiency declined. تفاصيل المقالة

organic solvents. In this study, NiFe2O4/sawdust nanocomposite was synthesized for removingoil pollutants. The oil-adsorbing nanocomposite could be easily separated from water bymagnet bar. The XRD results show tetragonal phase proving the composite formation. TheFESEM pictures successfully reveal the growth of NiFe2O4 on the sawdust template. The FTIRbands at 422 cm-1 and 615 cm-1correspond to the metal oxygen stretching band. VSM hysteresisloop proves the superparamagnetism of the composite. In addition contact angle depictshydrophobic properties of the resulted nanocomposite. More importantly, as-preparednanocomposite exhibited high oil adsorption capacity and good reusability. Our studies showeasy synthesis and fast method for oil removal from water. Facile synthesis procedure, highoil adsorption capacity, fast and simple magnetic separation and reusability of nanoadsorbentare among the benefits of these composite. This approach will open up new fields of studiesin polluted-water treatment. تفاصيل المقالة

In this study the interaction of cis-PtCl2(NH3)2 complex and graphene were investigated with MPW1PW91method in gas and solvent phases. The solvent effect was examined by the self-consistent reaction fieldtheory (SCRF) based on Polarizable Continuum Model (PCM). The selected solvents were chloroform,chlorobenzene, bromoethane, dimethyldisulfide, and dichloroethane. The solvent effect on thefrontier orbital energy and HOMO-LUMO gap were studied. The characterization of the interactionbetween two fragments was clarified with energy decomposition analysis (EDA). Pt-C(Graphene) andH(NH3)...C(Garaphen) interactions in the graphene … cis-PtCl2(NH3)2 complex were analyzed usingquantum theory of atoms in molecules analysis (QTAIM). تفاصيل المقالة

In this study, CeO2 hollow spherical nanoparticles, CeO2/SiO2 @ CeO2 core/shell composites,and hollow CeO2/SiO2 sensors were synthesized and their microstructures were researched byFT-IR, XRD, FESEM, EDX and BET analyses. The peaks observed in the FT-IR spectra of the synthesizedsamples corresponded to Ce-O stretching vibration (ca. 566 cm-1) and O-Si-O bendingvibration (ca. 470 cm-1). XRD diffraction patterns showed peaks at 2θ values in the 28.95° ,33.74°, 47.75° , 57.04°, 59.52° ,and 69.4° confirming cubic phase of CeO2. The FESEM imagesshowed that the particle shape was approximately spherical. The results of BET showed that,surface area of the CeO2 hollow spherical nanoparticles, CeO2/SiO2 @ CeO2 and hollow CeO2/SiO2 core/shell particles were 102.78, 80.49, and 119.71 m2/g, respectively. The nanosizedmetal oxides were used to quantitatively and qualitatively identify 1-propanol, 2-propanol,ethanol and methanol. The results showed that, the hollow CeO2/SiO2 core/shell was of largerpotentials for qualitative identification of 1-propanol and quantitative measurement of 2-propanol and ethanol. تفاصيل المقالة

در این پژوهش، نانوچندسازه H-CeO2/Fe به روش سل-ژل با کمک آب گرمایی سنتز و حساسیت این حسگر گازی نسبت به اتانول، 2-پروپانول و متانول، بررسی شد. روش‌های پراش پرتو ایکس (XRD)، میکروسکوپی الکترونی روبشی (SEM)، طیف سنجی تفکیک انرژی (EDS)، میکروسکوپی الکترونی عبوری (TEM) و BET برای بررسی ویژگی ساختاری و ریخت شناسی نانوچندسازه H-CeO2/Fe استفاده شد. با درنظرگرفتن شرایط عملیاتی در دمای C° 29 و رطوبت نسبی (RH) 45% حساسیت حسگر ساخته شده به اتانول نسبت به سایر ترکیب های آلی فرار، بالاتر بود. عامل های حساسیت، تکرارپذیری و زمان‌های پاسخ و بازیابی به عنوان ویژگی‌های عملکردی و عامل های انحراف استاندارد نسبی (RSD)، حد تشخیص (LOD) و ضریب تعیین نیز مورد ارزیابی و بررسی قرار گرفتند. نتیجه ها نشان داد که می‌توان از حسگر H-CeO2/Fe برای اندازه‌گیری کمی و کیفی اتانول استفاده کرد. سازوکار پاسخ‌دهی حسگر نسبت به اتانول نیز بحث و بررسی شد. تفاصيل المقالة

در این پژوهش، دو ترکیب سولفونامید-شیف باز 'N-‌(2-هیدروکسی-3-متوکسی بنزیلیدن)-4- متیل بنزوسولفونیل هیدرازید) و 1،2- بیس (2-هیدروکسی-3‌–‌ متوکسی بنزیلیدن هیدرازید) (1) و 'N-‌(2-هیدروکسی-3 متوکسی بنزیلیدن)-4-نیترو بنزوسولفونیل هیدرازید) و 1،2-بیس (2- هیدروکسی-3 متوکسی- بنزیلیدن هیدرازید) (2)) از گونه‌های سولفونیل کلرید و شیف باز سنتز شدند. ترکیبات سنتز شده با مس (II)‌ اکسید و روی اکسید پوشش داده شدند و از نظر فعالیت‌های ضدباکتری موردبررسی قرار گرفتند. ترکیبات شیمیایی تهیه‌شده، با طیف‌های رزونانس مغناطیسی هسته (NMR) و فروسرخ (FTIR)، الگوی پراش پرتو ایکس (XRD) و تجزیه عنصری شناسایی شدند. برای ریخت‌شناسی میکروذرات اکسید فلزی پیش و پس از پوشش‌دهی ترکیبات سولفونامید-شیف باز با آن‌ها، از میکروسکوپ الکترونی روبشی (SEM) استفاده شد. همچنین، فعالیت ضدباکتری ترکیبات در برابر دو باکتری گرم مثبت (استافیلوکوکوس اپیدرمیدیس و استافیلوکوکوس ساپروفیتیکوس) و یک باکتری گرم منفی (پروتئوس میرابیلیس) بررسی شد. نتایج به‌دست آمده نشان می‌داد که فعالیت ضدباکتری ترکیبات سولفونامید-شیف باز خالص در برابر باکتری‌های گرم مثبت و منفی نسبت به ترکیبات سولفونامید-شیف باز پس از پوشش‌دهی با میکرواکسیدهای فلزی کمتر است. لازم به‌ذکر است که آمپیسیلین و پنسیلین به‌عنوان داروهای استاندارد برای بررسی فعالیت ضدباکتری مورداستفاده قرار می‌گیرند. تفاصيل المقالة

در این پژوهش، ابتدا نانوذره‌های استرانسیم ‌هگزافریت دوپه‌شده با کاتیون‌های +Zn2+،‌Co2+،‌Zr4و فرمول SrFe11.1(Zn0.5Co0.5Zr)0.45O19 به‌روش سل‌ژل خوداحتراقی تهیه، سپس نانوچندسازه سه‌جزئی پلی‌آنیلین/ SrFe11.1(Zn0.5Co0.5Zr)0.45O19/اMWCNTs به‌روش بسپارش درجا تهیه شد. بررسی الگوهای پراش‌ پرتو ایکس (XRD) و طیف‌های فروسرخ تبدیل فوریه (FTIR) نمونه‌ها وجود فاز استرانسیم هگزافریت نوع M و همچنین، نانولوله‌های کربنی و پلی‌آنیلین در نمونه‌ها را تأیید کرد. تصویرهای میکروسکوپ الکترونی روبشی میدانی (FESEM) نشان‌دهنده پوشش مناسب ذره‌های هگزافریت و نانولوله‌های کربنی با رشته‌های بسپاری است. ویژگی مغناطیسی نمونه‌ها با استفاده از مغناطیس‌سنج نمونه مرتعش (VSM) اندازه‌گیری شد. به‌طوری‌که کمیت‌های مغناطیسی از مغناطیس اشباع (Ms) برابر با emu/g 60 و مغناطیس باقیمانده (Mr) برابر با emu/g 30 در ذره‌های هگزافریت به ترتیب به مقادیر emu/g 5/11 و emu/g 6 در نانوچندسازه کاهش یافت. ویژگی جذب مایکروویو نمونه‌ها نیز با آزمون تلفات انعکاس با استفاده از دستگاه تحلیل‌گر شبکه‌برداری (VNA) در دمای اتاق اندازه‌گیری شد. این نتایج نشان می‌دهد که نانوچندسازه تهیه‌شده دارای تلفات انعکاس dBا30- در بسامدGHz 10/1 و پهنای باند مناسب در گستره باند X مایکروویو است که توانایی استفاده از این ماده به‌عنوان جاذب مایکروویو را نشان می‌دهد. تفاصيل المقالة

A new mixed metal–organic framework [Zn0.5 Cd0.5 (NH2BDC) (4-bpmbp)].2DMF (NH2BDC = 2-amino terephthalate; 4-bpmbp = N4, N4'-bis (pyridine-4-ylmethylene)-biphenyl-4,4'- diamine DMF = N,N-dimethylformamide) (Zn-Cd-MOF) has been synthesized under solvothermal conditions using Cd2+ and Zn2+ salt, NH2BDC as a rigid ligand and 4-bpmbp as pillar ligand. The material was characterized by Fourier transform infrared (FT-IR), powder Xray diffraction (PXRD), and inductively coupled plasma (ICP) techniques. Furthermore, the catalytic behavior of Zn-Cd-MOF toward the Knoevenagel condensation reaction was investigated and good catalytic capability was achieved تفاصيل المقالة