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Search Results: 1 - 10 of 50206 matches for " Ti/PbO2 anode "
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Production and characterization of TI/PbO2 electrodes by a thermal-electrochemical method
Laurindo, Edison A.;Bocchi, Nerilso;Rocha-Filho, Romeu C.;
Journal of the Brazilian Chemical Society , 2000, DOI: 10.1590/S0103-50532000000400018
Abstract: looking for electrodes with a high overpotential for the oxygen evolution reaction (oer), useful for the oxidation of organic pollutants, ti/pbo2 electrodes were prepared by a thermal-electrochemical method and their performance was compared with that of electrodeposited electrodes. the open-circuit potential for these electrodes in 0.5 mol l-1 h2so4 presented quite stable similar values. x-ray diffraction analyses showed the thermal-electrochemical oxide to be a mixture of ort-pbo, tetr-pbo and ort-pbo2. on the other hand, the electrodes obtained by electrodeposition were in the tetr-pbo2 form. analyses by scanning electron microscopy showed that the basic morphology of the thermal-electrochemical pbo2 is determined in the thermal step, being quite distinct from that of the electrodeposited electrodes. polarization curves in 0.5 mol l-1 h2so4 showed that in the case of the thermal-electrochemical pbo2 electrodes the oer was shifted to more positive potentials. however, the values of the tafel slopes, quite high, indicate that passivating films were possibly formed on the ti substrates, which could eventually explain the somewhat low current values for oer.
Production and characterization of TI/PbO2 electrodes by a thermal-electrochemical method
Laurindo Edison A.,Bocchi Nerilso,Rocha-Filho Romeu C.
Journal of the Brazilian Chemical Society , 2000,
Abstract: Looking for electrodes with a high overpotential for the oxygen evolution reaction (OER), useful for the oxidation of organic pollutants, Ti/PbO2 electrodes were prepared by a thermal-electrochemical method and their performance was compared with that of electrodeposited electrodes. The open-circuit potential for these electrodes in 0.5 mol L-1 H2SO4 presented quite stable similar values. X-ray diffraction analyses showed the thermal-electrochemical oxide to be a mixture of ort-PbO, tetr-PbO and ort-PbO2. On the other hand, the electrodes obtained by electrodeposition were in the tetr-PbO2 form. Analyses by scanning electron microscopy showed that the basic morphology of the thermal-electrochemical PbO2 is determined in the thermal step, being quite distinct from that of the electrodeposited electrodes. Polarization curves in 0.5 mol L-1 H2SO4 showed that in the case of the thermal-electrochemical PbO2 electrodes the OER was shifted to more positive potentials. However, the values of the Tafel slopes, quite high, indicate that passivating films were possibly formed on the Ti substrates, which could eventually explain the somewhat low current values for OER.
Properties of Ti/SnO2+Sb2O3+MnO2/PbO2 Anode
Ti/SnO2+Sb2O3+MnO2/PbO2阳极的性能研究

LIANG Zhen-Hai,SUN Yan-Ping,
梁镇海
,孙彦平

无机材料学报 , 2001,
Abstract: A new kind of non-noble metal anode-Ti/SnO2+Sb2O3+MnO2/PbO2 was studied by means of SEM and XRD. The lifetime and kinetic parameters were determined in 1mol/L H2SO4. Fractal dimension of electrodes was also discussed. The anode is better than lead for treatment of coking waste water of containing phenol. The results show that conversion rate of phenol is 95.8% and economization on electrity is 33%.
A comparison of electrodeposited Ti/β-PbO2 and Ti-Pt/β-PbO2 anodes in the electrochemical degradation of the direct yellow 86 dye
Aquino, José M.;Irikura, Kallyni;Rocha-Filho, Romeu C.;Bocchi, Nerilso;Biaggio, Sonia R.;
Química Nova , 2010, DOI: 10.1590/S0100-40422010001000023
Abstract: the electrochemical performance of electrodeposited ti/β-pbo2 and ti-pt/β-pbo2 anodes was galvanostatically evaluated (batch mode, 50 ma cm-2) to degrade the direct yellow 86 dye (100 or 200 mg l-1 in 0.1 mol l-1 na2so4 + 1.5 g l-1 nacl), investigating the effect of ph and temperature. similar results were obtained for both electrodes and the best conditions for removal of color and chemical oxygen demand are ph 7 and 40 °c, when 90% decolorization is attained by passing a charge of only ~0.13 a h l-1 and total mineralization is achieved with expenditure of ~5 kw h m-3.
二氧化铅电极的制备、表征及其电催化性能研究
徐亮,赵芳,农佳莹,成侃,张勇
环境工程学报 , 2008,
Abstract: 以电沉积法制备了Ti/PbO2和Ti/MnO2/PbO22种电极。采用SEM、XRD和XPS等分析方法表征了电极的形貌、元素组成及元素化学态,并以罗丹明B为目标有机物,考察了所制备电极的析氧极化曲线和电催化活性以及Ti/MnO2/PbO2电极的循环伏安曲线。研究结果表明,Ti/MnO2/PbO2电极的稳定性、使用寿命、析氧电位和电催化活性较Ti/PbO2电极都有所提高,并且罗丹明B在Ti/MnO2/PbO2电极上的反应主要发生在析氧反应区,且反应不可逆。
Electrochemical degradation of the reactive red 141 dye on a β-PbO2 anode assessed by the response surface methodology
Aquino, José M.;Rocha-Filho, Romeu C.;Bocchi, Nerilso;Biaggio, Sonia R.;
Journal of the Brazilian Chemical Society , 2010, DOI: 10.1590/S0103-50532010000200019
Abstract: the electrochemical degradation of the reactive red 141 dye using a filter-press reactor with a β-pbo2 anode was investigated through the application of the response surface methodology. the charge required for 90% decolorization (q90) and the chemical oxygen demand removal percentage after 30 min electrolysis (cod30) were used to model the system. the investigated independent variables were the current density, ph, nacl concentration, and temperature. low values of q90 (0.2-0.3 a h l-1) were obtained at acidic conditions (ph 1-3) and high concentrations of nacl (1.0-2.0 g l-1), when cl2 and hocl are the predominant oxidant species. the best values of cod30 were obtained at high current densities and acidic to neutral conditions (ph 5-7); however, the consequent energy consumption makes the process not economically feasible under these conditions. for strongly acidic solutions, specific energy consumptions associated to q90 as low as 0.79 kw h m-3 were attained.
Preparation of lead dioxide and iron doped lead dioxide electrodes and study on their electrocatalytic performances
PbO2和掺杂的Fe-PbO2电极的制备及电催化性能研究

Yang Yan,Zhang Jianmin,
杨岩
,张建民

环境工程学报 , 2009,
Abstract: 在0.35 mol/L、pH=1~2的Pb(NO3)2溶液中采用阳极恒流电沉积技术制备PbO2电极和掺杂的Fe-PbO2电极。用X射线衍射、扫描电镜方法研究了电极的结构及形貌。通过循环伏安测试考察了其在0.1 mol/L Na2SO4溶液和0.01 mol/L苯酚+0.1 mol/L Na2SO4溶液中的电化学性能。用PbO2电极和掺杂的Fe-PbO2两种电极,在50 mA/cm2电流密度下降解0.01 mol/L模拟酚类废水,120 min后测得苯酚的去除率分别为51.30%和60.23%,邻苯二酚去除率分别可达76.71%和84.26%。
Development of a HPLC method to follow the degradation of phenol by electrochemical or photoelectrochemical treatment
Andrade, Leonardo S.;Laurindo, Edison A.;Oliveira, Regina V. de;Rocha-Filho, Romeu C.;Cass, Quezia B.;
Journal of the Brazilian Chemical Society , 2006, DOI: 10.1590/S0103-50532006000200022
Abstract: the development and validation of a hplc method to follow the degradation of phenol by electrochemical or photoelectrochemical treatment are described. this method, which allows determining amounts of phenol, p-benzoquinone and cathecol in electrolyzed or photoelectrolyzed solutions, was used for analysis of reaction intermediates during electrooxidation or photoelectrooxidation of phenol using a ti-pt/pbo2 (obtained by thermal-electrochemical or electrodeposition methods) or ti/tio2 doped with ga3+ (obtained by thermal decomposition of precursor salts) electrode.
Development of a HPLC method to follow the degradation of phenol by electrochemical or photoelectrochemical treatment
Andrade Leonardo S.,Laurindo Edison A.,Oliveira Regina V. de,Rocha-Filho Romeu C.
Journal of the Brazilian Chemical Society , 2006,
Abstract: The development and validation of a HPLC method to follow the degradation of phenol by electrochemical or photoelectrochemical treatment are described. This method, which allows determining amounts of phenol, p-benzoquinone and cathecol in electrolyzed or photoelectrolyzed solutions, was used for analysis of reaction intermediates during electrooxidation or photoelectrooxidation of phenol using a Ti-Pt/PbO2 (obtained by thermal-electrochemical or electrodeposition methods) or Ti/TiO2 doped with Ga3+ (obtained by thermal decomposition of precursor salts) electrode.
Application of Ti/BDD/PbO2 composite electrode in chemical oxygen demand determination
Ti/BDD/PbO2复合电极在化学需氧量测定中的应用

Ma Chuanjun,Zhao Huimin,Chen Shuo,Quan Xie,
马传军
,赵慧敏,陈硕,全燮

环境工程学报 , 2012,
Abstract: 以钛基掺硼金刚石为基体,采用电沉积的方法制备了Ti/BDD/PbO2复合电极,并将其用于化学需氧量(COD)的测定。采用扫描电子显微镜(SEM)和X射线衍射谱图(XRD)表征了电极的微观形貌及结构,采用电化学工作站考察了电极对有机物响应特性。实验结果表明,在1.45 V的低电位条件下,线性范围为0.5~175 mg/L,检测限为0.3 mg/L (S/N=3)。采用Ti/BDD/PbO2复合电极测定法和重铬酸钾标准方法对市政污水、食品废水及印染废水的对比结果表明,2种方法的相对误差小于10%,具有良好的一致性。
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