| With the rapid development of industry, The pollution of metal iron ions increasing seriously. This has caused some damage to the environment, animals, plants as well as the human body. So it is very necessary to detect the iron ions efficiently and rapidly. Among many detection methods for metal iron ions, the electrochemical sensor because of some advantages for example easy operation, fast speed, low cost has been widely studied. At the same time, the sensing properties of electrochemical sensor can be improved by the modify of nano materials. But the traditional electrode is mercury electrode, generally. Which is serious toxicity. Therefore, a new type of electrochemical sensor made by TiO2 nanotubes is put forward in the paper. In order in order to achieve efficient detection of metal Fe3+ ions.TiO2 nanotube arrays are fabricated by the method of anodic oxidation, which has arrange orderly and high length-diameter ratio. The process parameters, including composition of electrolyte, anodic oxidation voltage, oxidation time, oxidation temperature, calcination temperature, etc. are analyzed detailedly by the method of control variable, in order to understand its effect to the morphology and properties of TiO2 nanotube array. On this basis TiO2 nanotube arrays are fabricated, which is good appearance, highly ordered, excellent performance. Though the electrochemical workstation, the fabricated TiO2 nanotube arrays are used as electrodes to detect the iron ions by the method of square wave stripping voltammetry. The results show that TiO2 electrode has good sensing properties for metal iron ions. The linear ratio of peak current and iron ions concentration is good, whose linear relationship is y=0.00373x+1.1027. In addition, TiO2 nanotube arrays is modified by Ag loaded, which can not only improve efficiency of the charge transfer 17%,also reduce the adsorption of TiO2 nanotube arrays, in order to keep clean for electrode and timely used. |
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