University of GuilanChemistry of Solid Materials1120130401Study of decolorization variety by electrocoagulation process in the removal of Dye solution containing Remazol Yellow G: optimization of effective parameters using the Taguchi method2ae2279b17733e119aeec91b4bba4bd7873ENA.AsghariM.Bagheri-RoochiJournal Article19700101The Taguchi method was applied as an experimental design to determine optimum conditions for colour removal from azo dyes solutions containing remazol yellow G by electrocoagulation (EC) using iron and steel electrodes as anode and cathode, respectively. An orthogonal array (OA9) experimental design that allows to investigation the simultaneous variations of four
parameters (initial remazol yellow G concentration, initial pH of the solution, time of electrolysis and current density) which have three levels was employed to evaluate the effects of experimental parameters. Performance measure analysis was followed by performing a variance analysis, in order to determine the optimum levels and relative magnitude of the effect of parameters. The desired characteristic for response has been elected as maximum
decolourization. Therefore, Taguchi’s ‘the larger the better’ performance formula was used. The optimum conditions were found to be initial remazol yellow G concentration, 100 mg/l, initial pH of the solution 9, time of electrolysis, 25 min, and current density, 1mAcm-2.https://csm.guilan.ac.ir/article_873_bde44cf6d0ecf4aebc20816765932fc5.pdfUniversity of GuilanChemistry of Solid Materials1120130401A comparative study on the dispersion of CuO-ZnO-Al2O3 nanoparticles over HZSM-5 via batch co-precipitation, semibatch co- precipitation and combined co-precipitation-ultrasound methods64a3e6268e5c084680002af830f5c6bd874ENر.خوشبینم.حقیقیJournal Article19700101A series of CuO-ZnO-Al2O3 nanoparticles over HZSM-5 were successfully prepared using different methods of batch co-precipitation, semibatch co-precipitation and combined co-precipitation-ultrasound. Nitrates of copper, zinc and aluminum were used as precursors, while Na-ZSM-5 was employed as composite support and sodium carbonate was used as precipitant agent. The effects of preparation methods on physicochemical properties of synthesized
nanoparticles were studied using XRD, BET, FESEM, FTIR and TGA-DTG techniques. Furthermore, the formation mechanism of nanosized CuO-ZnO-Al2O3 over HZSM-5 was proposed. The formation of nanosized CuO-ZnO-Al2O3 over HZSM-5 with homogeneous grain size was addressed after calcination at 350°C for 5 hr. The results indicated that the crystalline
structure, thermal gravimetric behavior and surface morphology of the nanocomposite were strongly dependent on preparation methods. The combined co-precipitation-ultrasound method had superior control in crystallite size and CuO-ZnO-Al2O3 dispersion. This method resulted in many small grains with almost spherical shapes and narrow particle size distribution.https://csm.guilan.ac.ir/article_874_850f82fa9a1b02ba3108c60145b9b2b3.pdfUniversity of GuilanChemistry of Solid Materials1120130401Fe3O4 nanoparticles as a recyclable catalyst in the conversion of indole to isatin22a28246fbb3947711fc037d5b8b4df7875ENP.RahimiA.Khorshidiس.شریعتیJournal Article19700101Oxidation reaction of indole to isatin was performed in the presence of Fe3O4 nanoparticles (as catalyst) and commercial grade perhydrol (as oxidant). Magnetite nanoparticles were synthesized via chemical precipitation method and characterized by XRD and TEM techniques. The efficiency of reaction was obtained from GC analysis of the mixture. The catalyst was easily separated from the reaction mixture (after completion or before each injection) by using a
magnetic field of 1.4 T. The recycled catalyst maintained activity for successive runs.https://csm.guilan.ac.ir/article_875_bc527c533f47cde55f03282c8e895b04.pdfUniversity of GuilanChemistry of Solid Materials1120130401Batch experimental studies of Hg(II) ion removal from aqueous solution using seven synthetic polymers5108df3af72739a778eb039b9ad4a816876ENR.ShemshadiA.EfendiyevN.ZeynalovJournal Article19700101In this work application of seven synthetic polymers as adsorbents for the removal of Hg(II) from aqueous solution was studied. The equilibrium studies are systematically carried out in a batch process, covering various process parameters that include agitation time, adsorbent dosage, and pH of the aqueous solution. Variations of Hg(II) concentration in solution have been studied through measuring the amount of DTZ-Hg(II) complex by a double-beam spectrophotometer. Because of absorbance interference of DTZ-Hg(II) complex with DTZ ligands at 480 nm, which is λmax of the complex, the absorbance peak was checked at 595 nm, which belongs to DTZ ligands. Decreasing of Hg(II) concentration after contacting with the adsorbents expressed the efficiency of these absorbents in extraction of mercury(II) even in solution with high mercury(II) concentrations. It was observed in adsorption and desorption tests that synthetic polymers showed significant pH dependence, which affected the removal efficiency, robustly. Adsorption behavior is found to follow Freundlich and Longmuir isotherms. A regeneration study was also carried out.https://csm.guilan.ac.ir/article_876_4f1dec34eed4cf8e1d59ca5854857063.pdfUniversity of GuilanChemistry of Solid Materials1120130401Synthesis of phthalocyanine derivatives by synergistic effect of catalysts over nanodimensional zeolites under solvent-free conditions92ec081a441ed7c6511a912149e94cad877ENA.YahyazadehV.AzimiJournal Article19700101Copper (II) phthalocyanine and 2, 9, 16, 23 tetrakis nitro copper (II) phthalocyanine has been synthesized respectively from phthalonitrile and 4-nitro phthalonitrile under solvent-free condition using two different catalysts over nanodimensional zeolites. 4-Nitro phthalonitrile synthesized from phthaimide in three steps. The newly prepared compounds have been
characterized by IR, UV-Vis,1H NMR and MS spectra.https://csm.guilan.ac.ir/article_877_9caba95239f097ceaef99beedf5ad899.pdfUniversity of GuilanChemistry of Solid Materials1120130401Fabrication and nanostructural characterization of TiO2 nanorods2f371ad905f8a9c78ba87918820eaf40878ENM.RiazianJournal Article19700101TiO2 nanorods are synthesized by a thermal corrosion. In present work, synthesis of TiO2 nanorods in anatase, rutile and Ti8O15 phases, by using the sol-gel method and alkaline corrosion are reported. The morphologies and crystal structures of TiO2 nanorods are characterized by use of field emission scanning electron microscopy, atomic force microscopy and X-ray diffractometer techniques. The obtained results illustrate an aggregated structure at high calcined temperatures with the production of spherical particles. The effects of chemical compositions and calcined temperatures on surface topography and crystallization of phases are studied. Moreover, activation energy of nanoparticles formation is calculated during thermal
treatment.https://csm.guilan.ac.ir/article_878_376d45c21cf5f3f56ad8dd46b8a2eac0.pdf