阴丹士林艳绿FFB的间接电化学还原

The indirect electrochemical reduction of Indanthrene Brilliant Green FFB (IBG) was investigated in detail by cyclic voltammetry and electrolytic experiments. Triethanolamine (TEA) was used as ligand to form electrochemically active Fe(Ⅲ)-complexes in alkaline solution. The effects of operating parameters including reaction temperature,current density, concentration of NaOH and Fe(Ⅲ)-TEA mediator had been studied by orthogonal experiments and the mechanism of radicals on electrochemical reduction was discussed. The cyclic voltammetry experimental results show that Fe(Ⅲ)-TEA complexes are well suited for the indirect electrochemical reduction of IBG The electrolytic experiments show that high current efficiency (49.9%) can be successfully achieved under optimized conditions and the current density is found to be the main influence factor.     

邻氯硝基苯和邻硝基甲苯在Cu-Hg 电极上的电还原行为

采用循环伏安、线性伏安扫描及恒电位电解等测试手段,研究了邻氯硝基苯和邻硝基甲苯两种邻位取代硝基化合物在酸性电解液中的电还原性能,讨论了邻氯硝基苯和邻硝基甲苯在电还原过程中酸浓度以及反应物浓度等因素对电还原反应性能的影响,并探讨了可能的反应机理.研究表明:邻氯硝基苯和邻硝基甲苯在电还原过程中属不可逆反应,且都由扩散步骤控制;邻氯硝基苯由于氯的吸电子效应,可使硝基在较正的电位下进行电还原,且还原峰电流较大;邻氯硝基苯在电还原过程中生成的产物主要是氧化偶氮苯类化合物,而邻硝基甲苯经电还原后生成的产物是酚类化合物.     

芳族硝基化合物的电还原反应性能及其机理研究

采用循环伏安、线性扫描以及恒电位电解等测试方法,对o,m,p-氯硝基苯,o,m,p-硝基甲苯、o,m-硝基苯甲酸等八种芳族硝基化合物在硫酸-乙醇水溶液中的电还原性能及其机理进行了研究.结果表明,芳族硝基化合物在苯环上的取代基位置不同以及在相同位置上取代基的种类不同均可使各芳族硝基化合物的电还原性能发生较大差异;吸电子取代基在电还原过程中电位较正,推电子取代基的电还原电位较负;邻位取代基在反应过程中由于空间位阻效应,苯环上的硝基在电还原时电位往负方向移动.在电还原过程中,还原峰电流和表观活化能的大小均与取代基的电子效应和空间位阻相关,同时取代硝基氯苯得3个电子将还原生成氧化偶氮苯类化合物:邻、间硝基甲苯、硝基苯甲酸得4个电子将还原生成酚类化合物;对硝基甲苯得6个电子将还原生成胺类化合物,在此基础上,探讨了各芳族硝基化合物的电还原机理.     

阴丹士林艳绿FFB的间接电化学还原

The indirect electrochemical reduction of Indanthrene Brilliant Green FFB (IBG) was investigated in detail by cyclic voltammetry and electrolytic experiments. Triethanolamine (TEA) was used as ligand to form elec-trochemically active Fe(III)-complexes in alkaline solution. The effects of operating parameters including reaction temperature, current density, concentration of NaOH and Fe(III)-TEA mediator had been studied by orthogonal ex-periments and the mechanism of radicals on electrochemical reduction was discussed. The cyclic voltammetry ex-perimental results show that Fe(III)-TEA complexes are well suited for the indirect electrochemical reduction of IBG. The electrolytic experiments show that high current efficiency (49.9%) can be successfully achieved under op-timized conditions and the current density is found to be the main influence factor.     

绍兴城市空气质量现状及控制措施

以2003～2005年绍兴大气污染的主要监测指标为依据,分析了绍兴城市大气污染的现状、特征及原因。并根据近三年的监测数据对大气污染趋势进行分析,结论是市区首要污染物为可吸入颗粒物(PM10),其季节变化规律为冬>秋>春>夏。空气污染指数(API)年平均值近三年间均有下降趋势,并针对空气污染提出了相应整改措施。     

碱性介质中对苯二胺在铂微电极上的电化学聚合研究

采用循环伏安法,比较了酸性、中性和碱性介质下对苯二胺(p-PD)在铂微电极上的电化学聚合的异同,并探讨扫描速度、底物浓度等因素对p-PD在碱性体系下的电化学聚合行为的影响.结果表明,只有碱性介质才能得到吸附于电极的高分子膜;铂电极上p-PD的氧化反应为不可逆过程;在20~100 mV/s的扫描速率范围内,阳极峰电流与扫描速度的1/2次方成线性关系,表明该电极反应受扩散控制.