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PTFE-F-PbO2 电极在H2SO4溶液中的析氧行为 总被引:1,自引:0,他引:1
F-PbO2 electrode and polytetrafluoroethylene (PTFE) doped F-PbO2 electrode (PTFE-F-PbO2) were prepared on a plexiglas sheet substrate by a series of procedure including chemical and electrochemical depositions. The electrochemical activities of these two electrodes for oxygen evolution (OE) reaction were examined by electrochemical tests. In comparison with F-PbO2, PTFE-F-PbO2 electrode exhibited larger active surface area and higher oxygen vacancy deficiency, which resulted in its higher electrocatalytic activity for OE. In addition, both exchange current density and activation energy of the electrodes for OE were calculated in terms of active surface area. The values of exchange current density and activation energy in 0.5 mol·L^-1 H2SO4 aqueous solution were 1.125×10^ -3 mA·cm^-2 and 18.62 kJ·mol^-1 for PTFE-F-PbO2, and 8.384×10^-4 mA·cm^- 2 and 28.98 kJ·mol^-1 for F-PbO2, respectively. Because these values are calculated on the basis of the active surface areas of the electrodes, the enhanced activity of PTFE-F-PbO2 can be attributed to an increase in oxygen vacancy deficiency of PbO2 due to doping by PTFE. The influence of PTFE adulteration on the activity of PbO2 film electrode for OE was investigated in detail in this study. 相似文献
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对氨基苯酚的绿色电化学合成及其工业化 总被引:17,自引:9,他引:8
研究了在阴极转动分隔式电解槽中硝基苯电化学还原制备对氨基苯酚(PAP)时阴极转速、反应温度等工艺参数对电解性能的影响,并考察了不同阳极材料的稳定性.实验结果表明,增大阴极转速和升高反应温度有利于反应的进行;自制的Pb-Sb-Sn-Ag-Cu五元合金作为阳极材料具有比Ti/Ir阳极更长的工作寿命.当以铅合金为阳极材料、体系温度为90℃、阴极转速为900 r8226;min-1、电解电流为3000 A时,硝基苯的平均转化率为99%,PAP平均收率为69.9%,电解直流电单耗为7.24 kW8226;h8226;(kg PAP)-1,产品纯度大于98%,熔点为186.1~187.3 ℃. 相似文献
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研究了几种生化难降解有机物在预臭氧化过程可生化性(BOD5/CODCr,即5天生化需氧量与化学耗氧量的比值)的变化情况,并提出了一个氧化度(即有机物的氧化程度,定义为:(4TOC-CODCr)/4TOC,其中TOC为总有机碳)的概念。结果表明,在预臭氧化硝基苯、邻苯二甲酸二甲酯和磺基水杨酸模拟水样过程中,水样的氧化度和可生化性均有不同程度的提升,而且两者存在一定的正相关性。当体系氧化度大于0.65时,水样的BOD5/CODCr一般均在0.2以上,可直接进行生化处理。对某酸性化工废水进行了预臭氧化处理(Ti(Ⅳ)/H2O2/O3),120 min后CODCr和TOC的去除率分别达到了66.09%和34.09%,此时水样的氧化度从原来的0.346升至0.664,BOD5/CODCr值从原来的0.05升至0.332,显示了较好的正相关性。利用易测的氧化度来预判水样的可生化性,这对推广预臭氧化技术在实际难降解废水处理中的应用具有重要的实际意义。 相似文献
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采用共沉淀法制备了还原石墨烯纳米片和磁铁矿复合材料(rGO-Fe_3O_4)。利用X射线衍射(XRD)、X射线光电子能谱(XPS)和透射电镜(TEM)对其进行了表征。以酸性红73 (AR73)为目标物,研究了rGO-Fe_3O_4活化过硫酸盐(PS)处理酸性红73的效能,考察了催化剂投加量、PS浓度、溶液初始pH以及反应温度的影响。结果表明,室温下催化剂投加量为1.0 g/L、PS的浓度为1.0 g/L及初始pH为6.9时,10 min内50 mg/L酸性红73的脱色率达到100%。淬灭实验结果表明rGO-Fe_3O_4/PS反应体系同时存在SO4-?、·OH和单线态氧1O2,其中1O2的氧化反应起主导作用。复合材料rGO-Fe_3O_4不但活性高,而且便于分离,应用前景良好。 相似文献
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A polytetrafluoroethylene (PTFE)-doped PbO2 electrode on a Ti substrate was prepared by galvanostatic method from the sulfamic acid bath (Ti/PTFE-F-PbO2-I) or nitric acid bath (Ti/PTFE-F-PbO2-II). Scanning Electron Microscopy revealed that the Ti/PTFE-PbO2-I electrode had a more regular morphology with smaller size crystals than the Ti/PTFE-F-PbO2-II electrode. On the basis of the results of both the accelerated electrolysis test and the empirical formula for estimating the service life of an electrode, the service life of the Ti/PTFE-PbO2-I electrode was predicted to be more than 7 years under conventional electrolysis conditions (0.1 A·cm-2). During the treatment of 4-chlorophenol-contaminated water, the Ti/PTFE-PbO2-I anode showed both a good electro-catalytic activity and high electrochemical stability, exhibiting an excellent potential application. 相似文献
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介绍了7万t/a离子膜烧碱装置在引进旭化成电解槽后采取的技术改进措施。通过改进,旭化成F4203膜的使用寿命长达6年,离子膜装置的技术经济指标居国内先进水平。 相似文献
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采用柠檬酸-硝酸盐燃烧合成了纳米级CeO2基阳极支撑平板式固体氧化物燃料电池(solid oxide fuel cell,SOFC)的电解质与电极材料。研究了SOFC三极板[NiO-Ce0.8Gd0.2O1.9(CGO),阳极;CGO电解质;La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)-CGO阴极]的制备工艺,对制膜过程、烧结工艺等做了探讨。指出了较佳的制备条件。结果表明:物理混合得到的阳极优于共燃烧得到的阳极;球磨分散得到的阳极致密,乳化分散得到的阳极中NiO与CGO的分散较为均匀。 相似文献