16014

1644 دكتري

دكتري

شيمي معدني

اصفهان : دانشگاه صنعتي اصفهان

1398

هفده، [117]ص: مصور، جدول، نمودار

كاظم كرمي

علي اصغر انصافي، شادپور ملك پور

علي حسين كيانفر، حسين چيني فروشان اصفهاني، محمد محسن مومني، بهرام يداللهي

1399/08/27

كتابنامه

شيمي

شيمي

1399/10/13

2624885

91 هفده چكيده در پژوهش حاضر كه متشكل از سه قسمت ميباشد سه كاتاليست ناهمگن گوناگون سنتز شدند و پس از شناسايي كامل با تكنيكهاي گوناگون شامل FT IR VSM XRD EDAX XPS TEM FE SEM TGA DTA و ICP فعاليت كاتاليستي آنها در واكنشهاي كاهش پارانيتروفنول به پاراآمينوفنول كاهش اكسيژن جذب سطحي و كاهش كروم بررسي شد در بخش نخست اين پژوهش گرافن اكسـيد به روش هامر سـنتز شـد سپس گرافن اكسيد مغناطيسي 4 GO MnFe2O با تثبيت نانوذرههاي مغناطيسي 4 MnFe2O روي سطح گرافن اكسيد حاصل آمد گرافن اكسيد مغناطيسي به صورت كوواالنسي با 3 آمينوپروپيلترياتوكسيسيالن اصالح شد سرانجام با افزودن 3 متوكسي بنزآلدهيد و پاالديم استات كمپلكس پاالديم روي بستر مغناطيسي تثبيت و نانو هيبريد Pd @GO 4 MnFe2O بهدست آمد از نانوهيبريد پاالديم بـهعنـوان كاتاليسـت واكنش كاهش پارانيتروفنول به پاراآمينوفنول استفاده شد كه نتايج نشان داده شده درطيف سنجي مريي فرابنفش ويژگي كاتاليستي اين كمپلكس در كاهش پارا نيتروفنول را تأييد ميكند

125 Synthesis and characterization of palladium nanocatalysts on magnetic graphene oxide substrates and study of their catalyticand electrocatalytic properties in the reactions of paranitrophenol reduction oxygen reduction and removal of Cr Neda Sadat Mousavi n mousavi@ch iut ac ir Department of Chemistry Isfahan University of Technology Isfahan 84156 8311 Isfahan IranSupervisor Prof K Karami karami@cc iut ac irAdvisor Assoc Prof S Mallakpour mallak@cc iut ac irAdvisor Assoc Prof A A Ensafi ensafi@cc iut ac irDepartment Graduate Program Coordinator Dr A N Chermahini AbstractIn this study that consists of three parts three different heterogeneous catalysts were synthesized and aftercharacterization by FTIR XRD XPS TEM FESEM TG DTA and ICP their catalytic activity were investigatedfor reduction reaction of paranitrophenol reduction of oxygen adsorption and reduction of Cr In the first part of this research the graphene oxide was synthesized based of Hamers method magnetic grapheneoxide GO MnFe2O4 was synthesized by immobilization of magnetic nanoparticle MnFe 2O4 on the surface ofgraphene oxide Magnetic graphene oxide was covalently modified with 3 aminopropyltrimethoxysilane Theimine functional group created by addition 3 methoxybenzaldehyde on the surface Finally by adding Pd AOc 2nanohybrid of palladium was abbtianed The catalytic characteristic of Pd @GO MnFe2O4 nanohybride in thereduction of para nitorphenol was investigated which the results shown in the Uv Vis spectroscopy confirms thecatalytic activity of this complex in reduction of para nitrophenol In the second part of this research the graphene oxide was synthesized based of Hamers method magneticgraphene oxide GO Fe3O4 was synthesized by immobilization of magnetic nanoparticle Fe 3O4 on the surface ofgraphen oxide Magnetic graphene oxide was covalently modified with benzoic hydrazide Finally by addingPd AOc 2 nanohybrid of palladium was abbtianed The synthesized materials were characterized with differentmethods and were studied with different electrochemical methods The mechanistic aspects of the oxygen reductionreaction as well as the electrocatalytic effect of presence and absence of Pd @GO Fe3O4 in alkaline solutionwere studied by cyclic voltammetry linear sweep voltammetry and chronoamperometry The number of electronstransferred per O2 molecule n was obtained in the presence of Pd @GO Fe3O4 is close to 4 The modifiedelectrodes exhibit a high selectivity for ORR with a remarkable tolerance to crossover effects More importantly they have good durabilities In the third part of this research the graphene oxide was synthesized based of Hamers method Then the surfaceof the graphene oxide was doped with nitrogen by used of ammonium hydroxide magnetic graphene oxide GO MnFe2O4 was synthesized by immobilization of magnetic nanoparticle MnFe2O4 on the surface of graphen oxide Finally by adding Pd AOc 2 Pd@GO NH2 MnFe2O4 nanocomposite nanohybrid was abbtianedIn addition surface of the nitrogen doped graphene oxide NGO is decorated MnFe2O4 nanoparticle Finally Pd@GO NH2 MnFe2O4 nanocomposite was used for removal of Cr VI from aquase soloution Then parametersincluding pH contact time and concentration of salt were optimaized Also the sorption kinetics and isotherm ofthese sorbents were investigated KeyWords palladium nanocatalysts magnetic Graphene oxide Amine Functionalized reusable catalyst Reduction of p Nitrophenol Oxygen reduction reaction Hexavalent chromium

كاظم كرمي

علي اصغر انصافي، شادپور ملك پور

علي حسين كيانفر، حسين چيني فروشان اصفهاني، محمد محسن مومني، بهرام يداللهي