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Enhanced photocatalytic activity of electrochemically synthesized aluminum oxide nanoparticles

International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 358-371页

作者： Deepak Pathania Rishu Katwal Harpreet Kaur School of Chemistry Shoolini UniversitySolan-173212(H.P.)India Department of Chemistry Punjabi UniversityPatiala-147002(Punjab)India

In this study, aluminum oxide （Al2O3） nanoparticles （NPs） were synthesized via an electrochemical method. The effects of reac- tion parameters such as supporting electrolytes, solvent, current and electrolysis time on the shape and size of the resulting NPs were investi- gated. The Al2O3 NPs were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis/differential thermal analysis, energy-dispersive X-ray analysis, and ultraviolet-visible spectroscopy. Moreover, the Al2O3 NPs were explored for photocatalytic degradation of malachite green （MG） dye under sunlight irradiation via two processes： ad- sorption followed by photocatalysis; coupled adsorption and photocatalysis. The coupled process exhibited a higher photodegradation effi- ciency （45%） compared to adsorption followed by photocatalysis （32%）. The obtained kinetic data was well fitted using a pseudo-first-order model for MG degradation.

关键词： aluminum oxide nanoparticles electrochemical preparation photocatalysis

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Synthesis and electrochemical Performance of Co3O4/Graphene

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Chemical Research in Chinese Universities 2014年第4期30卷 650-655页

作者： WANG Hongzhi SHI Yulei LI Zixuan ZHANG Weiguo YAO Suwei Department of Applied Chemistry School oJ Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China

Co3O4/reduced graphene oxide composites were synthesized via a simple electrochemical method from graphene oxide and Co（NO3）2·6H2O as raw ***3O4 nanoparticles with sizes of around 30-50 nm were distributed on the surface of graphene nanosheets confirmed by scanning electron microscopy and transmission electron *** properties of Co3O4/graphene composite were tested by cyclic voltammetry,galvanostatic charge-discharge,and electrochemical impedance *** Co3O4/reduced graphene oxide composite was used as the pseudocapacitor electrode in the 2 mol/L NaOH aqueous electrolyte *** Co3O4/reduced graphene oxide composite electrode exhibited a specific capacitance of 357 F/g at a current density of 0.5 A/g in a three-electrode system.72％ of capacitance was retained when the current density increased to 3 A/*** Co3O4/reduced graphene oxide composite prepared electrodes show a high rate capability and excellent long-term *** 1000 cycles of charge and discharge,the capacitance is still maintained 87％ at a current density of 1 A/g,indicating that the composite is a oromising alternative electrode material used for supercapacitors.

关键词： Cobalt oxide Graphene Composite electrochemical preparation Supercapacitor

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Double catholyte electrochemical approach for preparing ferrate-aluminum: a compound oxidant-coagulant for water purification

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Journal of Environmental Sciences 2002年第1期14卷 49-53页

作者： QuJH LeiPJ StateKeyLaboratoryofEnvironmentalAquaticChemistry ResearchCenterforEco－EnvironmentalSciencesChineseAcademyofSciencesBeijing100085China.E－mail：jhqu@*** StateKeyLaboratoryofEnvironmental

Ferrate is an excellent water treatment agent for its multi functions in oxidation, disinfection, coagulation and adsorption, but its coagulation ability depends on its dosage and is after its oxidation. This paper focuses on preparing a new kind of ferrate combined with alum to enhance its coagulation function for water purification. An effective electrolysis reactor was designed and employed in the test. Some key parameters in the process of electrolysis concerning the preparation efficiency, such as the current density, temperature and alkalinity were also investigated. The proper conditions for ferrate alum preparation were determined. Under the condition of 5V given voltage, 6h electrolyzing interval, below 2% alum concentration (in weight), a combined liquid ferrate alum products was successfully prepared, which contained 0.0294 mol/L FeO 2- 4 and 0.0302 mol/L total soluble ferron with 2% Al 2O 3. There was no insoluble ferron produced by controlling an optimum electrochemical condition.

关键词： combined ferrate alum electrochemical preparation oxidation coagulation

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