Semnan University PressApplied Chemistry Today2981-243782620130321Synthesis of copper nanoparticle- decorated graphene oxide nanocomposite and its application in azo dye degradationSynthesis of copper nanoparticle- decorated graphene oxide nanocomposite and its application in azo dye degradation92063110.22075/chem.2017.631FATaherehPoursaberiHadiGhanbarnejadMohammad RezaShojaMohsenBahari YamcheluJournal Article20170115Graphene with unique physico-chemical properties is known as a new phenomenon in material science. Combining the properties of graphene with other nanomaterials, results in exceptional nanocomposites. One route is the decoration of graphene sheets with nanocrystals. On the other hand application of zero valent metals for the wastewater treatment is a widely accepted technology. In this study the nanocopper decorated graphene composite was synthesized and characterized using different methods. The possibility of its application in the degradation of 4-(2-pyridylazo) resorcinol dye was investigated. The results showed that under optimal conditions, degradation of 50 ml dye solution (100 mg L-1) with 2 g L-1 of nanocomposite is achievable.Graphene with unique physico-chemical properties is known as a new phenomenon in material science. Combining the properties of graphene with other nanomaterials, results in exceptional nanocomposites. One route is the decoration of graphene sheets with nanocrystals. On the other hand application of zero valent metals for the wastewater treatment is a widely accepted technology. In this study the nanocopper decorated graphene composite was synthesized and characterized using different methods. The possibility of its application in the degradation of 4-(2-pyridylazo) resorcinol dye was investigated. The results showed that under optimal conditions, degradation of 50 ml dye solution (100 mg L-1) with 2 g L-1 of nanocomposite is achievable.https://chemistry.semnan.ac.ir/article_631_aca475368357d22a362d9260ba61176f.pdfSemnan University PressApplied Chemistry Today2981-243782620130321Synthesis of diazo dyes using the cellulose sulfuric acid at room temperatureSynthesis of diazo dyes using the cellulose sulfuric acid at room temperature212763210.22075/chem.2017.632FAFirouzehNematiSaraGadim AlizadehAliElhampourJournal Article20170115This article, describes a new method for synthesis of diazo dyes. In this protocol, cellulose sulfuric acid has been used as a proton source for producing diazonium salts. The resulting anion, in the presence of diazonium salt (ArN2+-O3SO-Cellulose), causes high stability of this salt at room temperature, and also results avoidance the use of harmful acids. This procedure for the preparation of diazonium salt was carried out under solvent free condition. The mixtur of amine, sodium nitrite and cellulose sulfuric acid, was grinded in a mortar and by grinding futher, coupling reaction was carried out. So by using cellulose sulfuric acid, diazo dyes with different derivatives were prepared in good to excellent yields and short reaction time, in one pot under ambient condition.This article, describes a new method for synthesis of diazo dyes. In this protocol, cellulose sulfuric acid has been used as a proton source for producing diazonium salts. The resulting anion, in the presence of diazonium salt (ArN2+-O3SO-Cellulose), causes high stability of this salt at room temperature, and also results avoidance the use of harmful acids. This procedure for the preparation of diazonium salt was carried out under solvent free condition. The mixtur of amine, sodium nitrite and cellulose sulfuric acid, was grinded in a mortar and by grinding futher, coupling reaction was carried out. So by using cellulose sulfuric acid, diazo dyes with different derivatives were prepared in good to excellent yields and short reaction time, in one pot under ambient condition.https://chemistry.semnan.ac.ir/article_632_cba1842b90aa95eff07fbd276cfe1083.pdfSemnan University PressApplied Chemistry Today2981-243782620130321Synthesis of magnetic nanoparticles (Fe3O4) and its application for extraction and preconcentration of drug sample from environmental samplesSynthesis of magnetic nanoparticles (Fe3O4) and its application for extraction and preconcentration of drug sample from environmental samples293763310.22075/chem.2017.633FAManoochehrBahmaieLalehAbbasiMohammadFarajiJournal Article20170115In this paper, the first part the chemical co-precipitation method was used in the preparation of magnetic nanoparticles and then application of SDS-coated Fe3O4 NPs as an adsorbent for extraction of trace amounts of terbinafine hydrochloride from pharmaceutical company wastewater was investigated. Then the drug was determined by high performance liquid chromatography with UV detection (HPLC/UV). The effects of various parameters on the extraction efficiency such as pH of solution, amount of SDS surfactant, extraction time, eluent type and desorption condithions were studied and optimized. Under the optimal conditions, the calibration curve was linear in the range of 1.0â400 µgL-1 with a correlation coefficient of 0.9998. Enrichment factor of 74 and limit of detection of 0.5µgL-1 were obtained. Also, the percent relative intra-day and inter-day standard deviation (R.S.D %) based on three replicate determinations were 1.0 and 3.5%, respectively. According to the results, the proposed method was successfully applied to extraction of terbinafine from environmental samples and satisfactory results were obtained.In this paper, the first part the chemical co-precipitation method was used in the preparation of magnetic nanoparticles and then application of SDS-coated Fe3O4 NPs as an adsorbent for extraction of trace amounts of terbinafine hydrochloride from pharmaceutical company wastewater was investigated. Then the drug was determined by high performance liquid chromatography with UV detection (HPLC/UV). The effects of various parameters on the extraction efficiency such as pH of solution, amount of SDS surfactant, extraction time, eluent type and desorption condithions were studied and optimized. Under the optimal conditions, the calibration curve was linear in the range of 1.0â400 µgL-1 with a correlation coefficient of 0.9998. Enrichment factor of 74 and limit of detection of 0.5µgL-1 were obtained. Also, the percent relative intra-day and inter-day standard deviation (R.S.D %) based on three replicate determinations were 1.0 and 3.5%, respectively. According to the results, the proposed method was successfully applied to extraction of terbinafine from environmental samples and satisfactory results were obtained.https://chemistry.semnan.ac.ir/article_633_cc46fd63c906f9a00ee918f154ffcc9d.pdfSemnan University PressApplied Chemistry Today2981-243782620130321IR spectroscopic study, HOMO-LUMO, NBO analysis, and some calculations on H2O, H2S, H2Se and H2Te by density functional methodIR spectroscopic study, HOMO-LUMO, NBO analysis, and some calculations on H2O, H2S, H2Se and H2Te by density functional method536263410.22075/chem.2017.634FALeileRahimi AharZohrehRahimi AharLidaAsadiJournal Article20170115In this investigation, IR spectroscopy, HOMO-LUMO analysis, NBO analysis, polarity determination, bond length, bond angle, natural charge of atoms, hardness, Softness, electrophilicity index and chemical potential from H2O to H2Te are calculated. DFT (Density Functional Theory) calculations with methods (PBEPBE and HCTH) and DGDZVP basis set were performed. According to the calculations, polarizability increases from H2O to H2Te and the HOMOâLUMO energy gap decreases. Using IR spectroscopy, vibrational active modes of the compounds have been studied. The vibrational frequencies decreases from H2O to H2Te due to the increase in bond length.In this investigation, IR spectroscopy, HOMO-LUMO analysis, NBO analysis, polarity determination, bond length, bond angle, natural charge of atoms, hardness, Softness, electrophilicity index and chemical potential from H2O to H2Te are calculated. DFT (Density Functional Theory) calculations with methods (PBEPBE and HCTH) and DGDZVP basis set were performed. According to the calculations, polarizability increases from H2O to H2Te and the HOMOâLUMO energy gap decreases. Using IR spectroscopy, vibrational active modes of the compounds have been studied. The vibrational frequencies decreases from H2O to H2Te due to the increase in bond length.https://chemistry.semnan.ac.ir/article_634_8510fa386e4aab0ea3d108808ff2c607.pdfSemnan University PressApplied Chemistry Today2981-243782620130321Experimental Investigation of the effect ions concentration, aging temperature and pH on Wettability alteration Process in Carbonate Rocks by Contact Angle MeasurementExperimental Investigation of the effect ions concentration, aging temperature and pH on Wettability alteration Process in Carbonate Rocks by Contact Angle Measurement738463510.22075/chem.2017.635FASaebAhmadiMohsenVafaie SeftiAlirezaBahramianEsmaelZanjiriKhosrowJarrahianJournal Article20170115Naturally fractured carbonate reservoirs have very low oil recovery efficiency owing to their wettability and tightness of matrix. Recovery efficiency can be considerably improved by changing reservoir rock wettability from oil-wetting to water-wetting state. In this work, the effect of different ions, pH, and temperature on wettability of carbonate rocks was investigated by means of contact angle measurements. The results indicate that the Ca2+, Mg2+ and SO42- ions can change the wetting state of carbonate rocks toward water-wetting, both individually and when they are mixed. According to our measured contact angle data, simultaneous increase of the concentration of both Mg2+ and SO42- ions has positive impact on wettability alteration of the carbonate surface more than that of obtained by variation of individual ions. It is also found that addition of NaCl salt changes the wettability to more oil-wetting. We did, moreover, measure the impact of temperature on the wettability change of the carbonate surface. It is observed that higher temperatures result in water-wet surfaces, owing to facilitating fatty acid desorption. However, the impact of pH on wettability alteration is found to be complex, resulting in various wettability states by changing pH from 3 to 10.Naturally fractured carbonate reservoirs have very low oil recovery efficiency owing to their wettability and tightness of matrix. Recovery efficiency can be considerably improved by changing reservoir rock wettability from oil-wetting to water-wetting state. In this work, the effect of different ions, pH, and temperature on wettability of carbonate rocks was investigated by means of contact angle measurements. The results indicate that the Ca2+, Mg2+ and SO42- ions can change the wetting state of carbonate rocks toward water-wetting, both individually and when they are mixed. According to our measured contact angle data, simultaneous increase of the concentration of both Mg2+ and SO42- ions has positive impact on wettability alteration of the carbonate surface more than that of obtained by variation of individual ions. It is also found that addition of NaCl salt changes the wettability to more oil-wetting. We did, moreover, measure the impact of temperature on the wettability change of the carbonate surface. It is observed that higher temperatures result in water-wet surfaces, owing to facilitating fatty acid desorption. However, the impact of pH on wettability alteration is found to be complex, resulting in various wettability states by changing pH from 3 to 10.https://chemistry.semnan.ac.ir/article_635_caaab3010c468d00b87851176d720384.pdfSemnan University PressApplied Chemistry Today2981-243782620130321Growth and Optical properties investigation of undoped and Ag-doped ZnO nanostructures by sol-gel methodGrowth and Optical properties investigation of undoped and Ag-doped ZnO nanostructures by sol-gel method859163610.22075/chem.2017.636FASaraKhosravi GandomaniRaminYousefiFaridJamali-SheiniJournal Article20170115Undoped and Ag-doped ZnO nanoparticles with different percentage of Ag (2%, 4%, and6%) were synthesized by a sol-gel method using a gelatin media as a polymerization agent. Zinc nitrate and silver nitrate were used as raw materials for reaction. The obtained nanoparticles were characterized by TEM, XRD, UV-vis, and PL. The TEM results showed that, the sizes of the nanoparticles were the same approximately. The XRD patterns indicated hexagonal structure for all samples and incorporation silver ions in to the ZnO lattice. The UV-vis and PL results revealed that, the optical properties of the undoped ZnO nanoparticles were better than the Ag-doped ZnO nanoparticles.Undoped and Ag-doped ZnO nanoparticles with different percentage of Ag (2%, 4%, and6%) were synthesized by a sol-gel method using a gelatin media as a polymerization agent. Zinc nitrate and silver nitrate were used as raw materials for reaction. The obtained nanoparticles were characterized by TEM, XRD, UV-vis, and PL. The TEM results showed that, the sizes of the nanoparticles were the same approximately. The XRD patterns indicated hexagonal structure for all samples and incorporation silver ions in to the ZnO lattice. The UV-vis and PL results revealed that, the optical properties of the undoped ZnO nanoparticles were better than the Ag-doped ZnO nanoparticles.https://chemistry.semnan.ac.ir/article_636_de4fafae06e3892c5c968802831d9e9a.pdf