【作者】 周志刚；

【导师】 常明；

【作者基本信息】 天津理工大学 ， 光学工程， 2007， 硕士

【摘要】 金刚石薄膜以其优异的电化学性能,逐渐成为电化学和电化学工程领域的最佳电极材料之一,并且在污水处理的应用和研究日益广泛。本论文较系统地研究了由化学气相沉积法制备得到的掺硼金刚石膜电极的物理性质和电化学性质,考察了该电极对对硝基苯酚的电催化特性,并探索了其在电化学方法处理超高COD难降解有机物中的应用。通过循环伏安法、液相色谱(HPLC)法研究了酸性条件下对硝基苯酚在掺硼金刚石膜电极上的电化学氧化特性。结果表明:在电解液稳定的电压范围内有反应发生,但是由于电极表面的钝化而失去活性,电解试验发生了多种氧化反应矿化对硝基苯酚。在电解过程中检测到多种可溶性产物如苯酚、苯醌、草酸等。这一结果说明:氧化对硝基苯酚,首先是硝基脱离苯环生成酚类物质,这些物质再转化为羧基酸,最后氧化为二氧化碳和水。研制了适用合于金刚石薄膜电极的污水处理设备。利用该设备降解处理了天津试剂二厂含磷废水,考察了电解时间、电压及极间距等参数对电化学降解效率的影响。结果表明,金刚石薄膜电极具有优异的污水降解性能,COD的去除率接近100%,电流效率最高达到0.8以上。更多还原

【Abstract】 Diamond thin film is a perspective material to be used in electrochemistry and electrochemical engineering due to its excellent electrochemical performance. Potential application of wastewater treatment has been proposed and is being actively pursued now. In this dissertation, the physical and electrochemical behaviors of the boron-doped diamond film electrode prepared by chemical vapor deposition technique were studied. And investigation of the oxidation of 4-nitrophenol on diamond electrode was also carried out with the goal of developing application in the electrochemical oxidation of refractory organics in superhigh COD for wastewater treatment.The electrochemical oxidation of 4-nitrophenol has been studied on boron-doped diamond electrodes on acid medium by cyclic voltammetry and HPLC . The results showed that in the potential region where the supporting electrolyte is stable, reactions occur, resulting in the loss of activity due to electrode fouling. Galvanostatic electrolyses cause complex oxidation reactions that lead to incineration of 4-nitrophenol. Phenol, benzoquinone, maleic, and oxalic acid have been detected as soluble products during the electrolysis of TNP. These results suggest that the electro-oxidation of 4-nitrophenol begin by the release of nitro groups from the aromatic ring to form non-nitrogenated phenolic compounds. These compounds are transformed into carboxylic acids which end to be oxidized to CO2. The complete removal of organic compounds contained in the waste has been obtained in sulfuric medium.A new equipment for wastewater treatment was developed, which was suitable for BDD thin film electrodes mentioned above. The electrochemical oxidation of wastewater in the second factory of Tian jin reagent, containing phosphorus, was carried out using our equipment. In particular, the effects of operating factors on current efficiency and pollutant removal were studied, such as time of electrolyte , voltage, space between anode and cathode. Examination results show that removal rate of COD is near 100% and current efficiency is over 0.8.更多还原