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Simultaneous determination of nitrophenol isomers at the single-wall carbon nanotube compound conducting polymer film modified electrode

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Science China Chemistry 2005年第3期48卷 177-182页

作者： ZHANG Hui WANG Zhenhui ZHOU Shuping College of Chemistry and Environmental Science Key Laboratory of Environmental Science and Engineering Education Commission of Henan Province Henan Normal University Xinxiang 453002 China College of Chemistry and Environmental Science Key Laboratory of Environmental Science and Engineering Education Commission of Henan Province Henan Normal University Xinxiang 453002 China College of Chemistry and Environmental Science Key Laboratory of Environmental Science and Engineering Education Commission of Henan Province Henan Normal University Xinxiang 453002 China

Based on the molecular recognition ability of conductive polymer and the peculiar properties of carbon nanotubes, a novel single wall nanotubes (SWNTs) compound poly(4- aminopyridine) modified electrode (SWNTs/POAPE) is prepared at glass carbon electrode (GCE). The electrochemistry response of nitrophenol isomers is studied at the SWNTs/POAPE. The re-sult indicates that o-, m- and p-nitrophenol are separated entirely at the SWNTs/POAPE interface. The electrode present here can be easily used to determine nitrophenol isomers simultaneously with higher sensitivity.

关键词： carbon nanotube compound poly (4-aminopyridine), modified electrode, nitrophenol, isomer, voltammetry.

Direct electron transfer of glucose oxidase on the carbon nanotube electrode

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Science China Chemistry 2004年第2期47卷 113-119页

作者： CAI Chenxin CHEN Jing LU Tianhong Department of Chemistry Nanjing Normal University Nanjing 210097 China Department of Chemistry Nanjing Normal University Nanjing 210097 China Department of Chemistry Nanjing Normal University Nanjing 210097 China

The direct electron transfer of glucose oxidase (GOx) immobilized onto the surface of the carbon nanotube (CNT)-modified glassy carbon (CNT/GC) electrode is reported. The di-rect electron transfer rate of GOx is greatly enhanced when it was immobilized onto the surface of CNT/GC electrode. Cyclic voltammetric results show a pair of well-defined and nearly sym-metric redox peaks, which corresponds to the direct electron transfer of GOx, with the formal potential 0()E, which is almost independent on the scan rates, of about 0.456 V (vs. SCE) in the phosphate buffer solution (pH 6.9). The apparent heterogeneous electron transfer rate con-stant (ks) of GOx at the CNT/GC electrode surface is estimated to be (1.74 ?0.42) s-1, which is much higher than that reported previously. The dependence of 0E on solution pH indicates that the direct electron transfer of GOx is a two-electron-transfer coupled with two-proton-transfer reaction process. The experimental results also demonstrate that the immobilized GOx retains its bioelectrocatalytic activity toward the oxidation of glucose. The method presented here can be easily extended to obtain the direct electrochemistry of other enzymes or proteins.

关键词： carbon nanotube, chemically modified electrode, direct electrochemistry, bioelectrocatalysis, glucose oxidase, glucose.

Studies on photo-electro-chemical catalytic degradation of acid scarlet 3R dye

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Science China Chemistry 2005年第4期48卷 297-304页

作者： LI Mingyu1,XIONG Lin1,CHEN Yunyun2,ZHANG Na1,ZHANG Yuanming2 & YIN Hua1 1.Department of Environmental Engineering,Jinan University,Guangzhou 510630,China 2.Department of Chemistry,Jinan University,Guangzhou 510630,China Department of Environmental Engineering Jinan University Guangzhou China Department of Chemistry Jinan University Guangzhou China

A new type of photo-electro-chemical catalytic reactor was *** and anode of the new reactor were made of high-purity graphite and titanium dioxide electrode re-spectively.A saturated calomel electrode (SCE) was used as the reference *** the condition of ultraviolet radiation and anodic bias-voltage,acid scarlet 3R was degraded by the process of photoelectrocatalysis with titanium dioxide electrode in anodic compartment,while it was degraded by electrogenerated Fenton’s reagent and hydrogen peroxide through reducing dissolved oxygen with graphite electrode in *** new reactor made the best use of photogenerated holes and photogenerated charge on the anode of the new reactor,which achieved the purpose of degrading acid scarlet 3R in the cathodic and anodic compartments simultaneously,i.e.“two electrodes and double effect”.The experimental results showed that,compared with other photoelectrocatalysis reactors (“two electrodes and single effect” reactor),the new reactor has obviously enhanced the degradation of acid scarlet 3R *** the con-centration of the dye being 30 mg·L?1 in water,under the operating conditions that when the inert supporting electrolyte concentration was 0.02 mol·L?1 sodium sulfate,initial solution pH = 3,and cathodic potential ?Ec = 0.66 V,the highest decolorizing efficiency of 92% was accomplished in cathodic compartment,and that of 60% in anodic compartment.

关键词： photo-electro-chemical catalysis, graphite electrode, photoelectrocatalysis, acid scarlet 3R.

Studies of surface processes of electrocatalytic reduction of CO_2 on Pt(210), Pt(310) and Pt(510)

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Science China Chemistry 2007年第5期50卷 593-598页

作者： FAN ChunJie FAN YouJun ZHEN ChunHua ZHENG QingWei SUN ShiGang State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

Surface processes of CO2 reduction on Pt(210), Pt(310), and Pt(510) electrodes were studied by cyclic voltammetry. Different surface structures of these platinum single crystal electrodes were obtained by various treatment conditions. The experimental results illustrated that the electrocatalytic activity of Pt single crystal electrodes towards CO2 reduction is decreased in an order of Pt(210)>Pt(310)>Pt(510), i.e., with the decrease of (110) step density on well-defined surfaces. When the surfaces were reconstructed due to oxygen adsorption, the catalytic activity of all the three electrodes has been enhanced to a cer- tain extent. Although the activity order remains unchanged, the electrocatalytic activity has been en- hanced more significantly as the density of (110) step sites is more intensive on the Pt single crystal surface. It has revealed that the more open the surface structure is, the more active the Pt single crystal electrode will be, and the easier for the electrode to be transformed into a surface structure that exhib- its higher activity under external inductions. However, the relatively ordered surfaces of Pt single crystal electrode are comparatively stable under the same external inductions. The present study has gained knowledge on the interaction between CO2 and Pt single crystal electrode surfaces at a micro- scopic level, and thrown new insight into understanding the surface processes of electrocatalytic re- duction of CO2.

关键词： Pt single crystal electrode, stepped surface, CO2 electrocatalytic reduction, surface processes

Liquid chromatography-electrochemical detection for studying the effects of tetrahydrobiopterin on monoamine neurotransmitters in rat striatum

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Science China Chemistry 2005年第4期48卷 368-375页

作者： ZHANG Wen ZHU Wei XU Haihong WAN Fangli GU Jing HAN Jingen JIN Litong Department of Chemistry East China Normal UniversityShanghai 200062China Department of ChemistryEast China Normal UniversityShanghai 200062China Department of ChemistryEast China Normal UniversityShanghai 200062China Department of ChemistryEast China Normal UniversityShanghai 200062China Department of ChemistryEast China Normal UniversityShanghai 200062China Department of ChemistryEast China Normal UniversityShanghai 200062China Department of ChemistryEast China Normal UniversityShanghai 200062China

Tetrahydrobiopterin (BH4) is an essential co-factor in the biosynthesis of monoamine neurotransmitters.A nano-Pt/Pd modified electrode as the electrochemical detector (ED) for high-performance liquid chromatography (HPLC) coupled with microdialysis sampling,is used to explore the effect of administration of BH4 on the monoamine neurotransmitters in the rat *** researches demonstrate that the contents of dopamine (DA),5-hydroxytryptamine (5-HT),5-hydroxyindoleacetic acid (5-HIAA) and homovanillic acid (HVA) increase significantly with the administration of *** pharmaceutical kinetics is carried out to research into the time course of BH4 effect on the concentration of monoamine neurotransmitters in rat striatum,which pro-vides reliable data for pathology and pharmacology research on neuroscience.

关键词： BH4, monoamine neurotransmitter, nano-Pt/Pd modified electrode, HPLC, ED, microdialysis sampling.

Analysis of the Parameters of the Ore RestorationFurnaces for Equal Power on the Shelf-Baking andGraphitized electrodes

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Journal of Energy and Power Engineering 2016年第12期10卷 786-791页

作者： Vladimir Kldiashvili Tamaz Natriashvili Slava Mebonia Aleksandre Shermazanashvili R. Dvali Institute of Machine Mechanics 10 Mindeli str. Tbilisi 0186 Georgia

Results of calculation of the power indicators of the ore restoration arc furnaces with the set power of 10.5 MVA workingon are given as on the self-baking also on the graphitized electrodes. It is established that despite high cost of the graphitizedelectrodes in comparison with the self-baking electrodes, power parameters much more improve. Besides, the natural power factorincreases, melting time decreases and that the most important the furnace turns out compact, convenient for service, building of thegraphitized electrodes is carried out for a small period, and also the number of service personnel is reduced. We propose a newdesign scheme of low-voltage circuit for the arc furnace according to the scheme ＂a triangle on the electrodes＂ designed in athree-bifilar version, in which more complete symmetry is gained by means of the crosspieces forming a triangle directly at theelectrode arms. In the proposed scheme, the current-carrying tubes that have different polarity are located on the same arm that leadsto further reduction in low-voltage circuit inductance. The application of this scheme allows for reducing reactive and activeresistances of low-voltage circuits by 2.5-3 times and 15-20%, respectively, as well as for shortening the heat, reducing specificenergy consumption and increasing the installation power factor.

关键词： Power indicators, ore restoration, arc furnace, self-baking, graphitized electrode, low-voltage circuit, reactive resistance,bifilar arrangement of tires.