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Open Access Article
1 - Removal of Bisphenol-A from Aqueous Solution Using Rice Husk Nanosilica: Adsorption Kinetics, Equilibrium and Thermodynamic Studies
Benjamin Olawale Orimolade Folahan Amoo Adekola Aderonke Aminat Mohammed Azeez Olayiwola Idris Oluwaseyi Damilare Saliu Taofeek YusufThis study evaluates the adsorption of bisphenol-A (BPA) from aqueous solutions using nanosilicaobtained from rice husk. Nanosilica (79 nm) was extracted from acid and thermal treated rice huskwaste. The rice husk nanosilica (RHS) was fully characterized through X-Ray D MoreThis study evaluates the adsorption of bisphenol-A (BPA) from aqueous solutions using nanosilicaobtained from rice husk. Nanosilica (79 nm) was extracted from acid and thermal treated rice huskwaste. The rice husk nanosilica (RHS) was fully characterized through X-Ray DiffractionSpectroscopy (XRD), Scanning Electron Microscopy (SEM), X-Ray Fluorescence Spectroscopy(XRF) and Fourier Transmittance Infrared Spectroscopy (FTIR). The spectroscopic analyses resultsrevealed that the rice husk ash contains large fraction of amorphous silica. Batch adsorptionexperiments were carried out on BPA as a function of initial concentration, contact time, pH,adsorbent dosage and temperature. The maximum amount of BPA adsorbed was 4.267 mg/g withan optimum contact time of 45 min for 50 mg/L BPA solution at pH 8. The adsorption data wereanalyzed with adsorption isotherms and fitted best into the Langmuir model with R2 value of 0.994.The adsorption process followed the pseudo second order kinetics and was exothermic while thenegative value of Gibbs free energy obtained revealed that the process is feasible at lowertemperature. Manuscript profile -
Open Access Article
2 - Solid-phase Extraction Using Modified Carbon Nanotube and Cupferron Ligand for Preconcentration and Determination of Trace Amounts of Copper in Real Samples
Maasoomeh Ghasemi Ali Moghimi Mohammad-Ali Karimi Shahla MozaffariA solid phase extraction procedure for simultaneous separation and preconcentration of traceamounts of Cu+2 ion from various real samples prior to its determination by flame atomicabsorption spectrometry has been developed. The proposed method is based on the utilizatio MoreA solid phase extraction procedure for simultaneous separation and preconcentration of traceamounts of Cu+2 ion from various real samples prior to its determination by flame atomicabsorption spectrometry has been developed. The proposed method is based on the utilization ofmultiwalled carbon nanotube in combination with Cupferron ligand as a solid phaseextractant. The influences of the analytical parameters, including pH, amounts of ligand andadsorbent, sample volume, volume and concentration of eluent, flow rates of solution and ,interference effects from the foreign metal ions were investigated for the optimum recoveries of theanalyte ion. The optimum pH for the separation of Cu+2 ion on the new sorbent was 7.0. Therelative standard deviation (RSDs) and the recoveries of standard addition for this method werelower than 5 % and 95-100 %, respectively. A sample volume of 200 mL resulted in apreconcentration factor of 100. The proposed procedure was successfully applied to thedetermination of copper in various real samples with satisfactory results. Manuscript profile -
Open Access Article
3 - Application of Nicotinic Acid Functionalized Chlorosulfonic Acid as a Green Catalyst for the Synthesis of Bis(2-methyl-1Hindole)Derivatives
Syedeh Fatemeh Hosseinzadeh Masoud Mokhtary3-Carboxy-1-sulfopyridin-1-ium chloride ([CPySO3H]+Cl-) as a novel ionic organocatalyst for thecondensation of aldehydes and 2-methylindole to synthesize bis(2-methyl-1H-indole) derivatives inacetonitrile at room temperature has been developed. Some tetrakis (2-methyl-1 More3-Carboxy-1-sulfopyridin-1-ium chloride ([CPySO3H]+Cl-) as a novel ionic organocatalyst for thecondensation of aldehydes and 2-methylindole to synthesize bis(2-methyl-1H-indole) derivatives inacetonitrile at room temperature has been developed. Some tetrakis (2-methyl-1H-indole)derivatives have also been synthesized by the reaction of 2,2'-(butane-1,4-diylbis(oxy))dibenzaldehyde and 2-methylindole or indole in the presence of chlorosulfonic acidimmobilized on nicotinic acid ([CPySO3H]+Cl-) at room temperature. All products formed inexcellent yields over short reaction times under mild and environmentally friendly conditions. Thismethodology offers significant improvements for the synthesis of bis(2-methyl-1H-indole)derivatives with regard to the yield of products, simplicity in operation and reusability of thecatalyst. Manuscript profile -
Open Access Article
4 - Voltammetric Determination of Venlafaxine by Using Multiwalled Carbon Nanotube- Ionic Liquid Composite Electrode
Elham Eslami Fatemeh FarjamiThe combination of multi-walled carbon nanotubes and ionic liquid 1-octylpyridinium hexaflourophosphate (OPFP) yields a carbon nanocomposite (MWCNT-CILE) that can be well used aselectrode for electrocatalytic oxidation of venlafaxine (VEN). The influence of variousexper MoreThe combination of multi-walled carbon nanotubes and ionic liquid 1-octylpyridinium hexaflourophosphate (OPFP) yields a carbon nanocomposite (MWCNT-CILE) that can be well used aselectrode for electrocatalytic oxidation of venlafaxine (VEN). The influence of variousexperimental parameters including pH of the solution, the amount of multi-walled carbon nanotubeused for the modification of the carbon ionic liquid electrode (CILE), accumulation potential,accumulation time and scan rate on the voltammetric responses of venlafaxine were all investigatedin the present research. The oxidation peak potential of venlafaxine appeared at 640 mV at theproposed electrode that is about 150 mV lower than the peak potential at traditional carbon pasteelectrodes (CPE). The oxidation is irreversible and exhibits adsorption controlled behavior. Underthe optimum conditions, the anodic peak current has a linear relationship with venlafexineconcentration in the range of 10.0 to 500.0μM. The detection limit (three times signal-to-noiseratio) of 0.47μM was found. Finally, the proposed sensor has the features of being sensitive,reproducible, easily renewable and cost effective which might suggest promising applications fordetermination of VEN in pharmaceiutical formualations as well as blood serum and urine samples. Manuscript profile -
Open Access Article
5 - Synthesis of Sulfoxides in Water by New Magnetic Nanoparticles Supported Tungstic Acid (MNP-TA), as a Selective Oxidation Method of Sulfides
MohammadJavad Taghizadeh Mehdi DidwarDifferent sulfides were oxidized to the corresponding sulfoxides, which is useful in drug industriesand important in biological activities, with a novel magnetically separable catalyst consisting oftungstic acid supported on silica coated magnetic nanoparticles in water MoreDifferent sulfides were oxidized to the corresponding sulfoxides, which is useful in drug industriesand important in biological activities, with a novel magnetically separable catalyst consisting oftungstic acid supported on silica coated magnetic nanoparticles in water as a green solvent in a goodto excellent yield without any over oxidation to sulfones in a simple, selective, and eco-friendlyway. The catalyst can be separated from reaction condition using an external magnetic field andreused for several times as its first structure. Using some different microscopic and spectroscopictechniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and EDXspectroscopy. Manuscript profile -
Open Access Article
6 - Nano-rice bran /TiCl4 a highly efficient catalyst for the one-pot synthesis of pyrano[3,2-b]pyrans
Sayed Rasul Shafe Mehrabadi Bahareh Sadeghi Saleheh ZavarNano-rice bran/TiCl4has been prepared from rice bran and TiCl4 in n-hexane as solvent. Thennanoricebran/TiCl4 has been introduced as a novel catalystfor the three component synthesis of pyrano[3,2-b] pyransfrom the simple one-pot reactionbetweenaryl aldehydes,cyanoaceta MoreNano-rice bran/TiCl4has been prepared from rice bran and TiCl4 in n-hexane as solvent. Thennanoricebran/TiCl4 has been introduced as a novel catalystfor the three component synthesis of pyrano[3,2-b] pyransfrom the simple one-pot reactionbetweenaryl aldehydes,cyanoacetamide and kojicacid.Cleanliness, an eco-friendly catalyst, simple methodology, short time, and excellent yields ofproducts are some advantages of this method. Manuscript profile -
Open Access Article
7 - Investigation of the Hydrate Formation Equilibrium Conditions of Natural Gas
Mohsen Kasaeezadeh Alireza AzimiOne of the main problems in oil recovery via the gas injection is the formation of hydrates in thelines. In order to prevent the formation of hydrate in these lines, which leads to the blockage andsometimes explosion, at first, the equilibrium formation conditions must MoreOne of the main problems in oil recovery via the gas injection is the formation of hydrates in thelines. In order to prevent the formation of hydrate in these lines, which leads to the blockage andsometimes explosion, at first, the equilibrium formation conditions must be determined and then toprevent its formation by changing the thermodynamic conditions or by adding the inhibitors. In thisresearch, the hydrate formation for a natural gas sample has been studied under the variousthermodynamic conditions. For this purpose, a gas sample was taken from the natural gastransmission lines. Then, the conditions for the formation of gas hydrates were determined from theexperimental equations. Also, by constructing and launching a laboratory system, the experimentswere carried out using the Isochoric method and the hydrate formation conditions were determined.The experiments were done at a temperature range of 264 to 300 K and a pressure range of 5 to 45bar in the pure water. The results showed that, with increasing temperature, the equilibrium pressureof the hydrate formation increases and with increasing pressure, the equilibrium temperature ofhydrate formation is reduced. Manuscript profile -
Open Access Article
8 - Application of Semiconductor Photocatalysis for Effective Elimination of Organic Contaminants from Sewage
Soodabe GharibeThe ZnO/SiO2 semiconductor nanophotocatalysis was synthesized via sol-gel method. Also, theplatinum particles were loaded on the ZnO/SiO2 nanoparticles by photoreductive method. Thestructure of catalyst was confirmed by X-ray diffraction (XRD), scanning electron microsc MoreThe ZnO/SiO2 semiconductor nanophotocatalysis was synthesized via sol-gel method. Also, theplatinum particles were loaded on the ZnO/SiO2 nanoparticles by photoreductive method. Thestructure of catalyst was confirmed by X-ray diffraction (XRD), scanning electron microscopy(SEM) andfourier transform infrared spectroscopy (FT-IR). The XRD patterns of ZnO particlesdisplayed the nanoparticles have a wurtzite structure (hexagonal phase). The crystallite sizes werecalculated using Scheerer’s equation and were around 32nm. For photocatalytic test, decompositionof Malachite Green oxalate (MG), as an organic pollutant was carried out by synthesized catalyst. Acomparison of degradation between bare catalyst and platinum loaded ZnO/SiO2nanoparticle underUV-Vis light irradiation shows that the Pt-ZnO/SiO2 photocatalyst is more efficient than ZnO/SiO2nanoparticles. Also, the activity of ZnO/SiO2nanoparticles in the visible light are minimal, whileloading of Pt in zinc oxide network displaced the band gap toward longer wavelengths (visiblelight) and increased the photocatalysis activity of ZnO/SiO2 in the range of visible light. Manuscript profile
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