Preparation Of Composite Nanoelectrodes And Their Application To The Detection Of Mining Wastewater

The heavy metal ions and toxic organic chemicals contained in mining wastewater will cause great damage to the environment.Therefore,China’s mining wastewater discharge requirements are very strict,which also poses great challenges to the treatment and composition monitoring of mining wastewater.Therefore,the treatment technology and composition detection technology of mining wastewater has become a work that we must always focus on.In this paper,two kinds of nano-electrodes based on nano-material modification were successfully developed and applied to the detection of two kinds of pollutants in mining wastewater.It is a combination of nanotechnology,electrochemical technology and mining.In the new field,it provides new technologies and methods for the analysis and detection of mining pollutants,and promotes the development of electrochemistry in the mining industry.The main contents of the paper are as follows:（1）The quartz nanotubes were successfully drawn and determined by SEM and electrochemical methods.The pore size was 70±20 nm.The carbon nanoelectrode was prepared by vapor deposition.The electrode was determined to be a nanoelectrode by cyclic voltammetry with an oxidative steady state current platform.（2）The carbon/gold nano-electrode was successfully prepared,and the detection of butyl xanthate by the electrode was studied.The results show that the carbon/gold nanoelectrode significantly improves the signal-to-noise ratio of the electrode compared with the ordinary carbon nanoelectrode.At the same time,the electrocatalytic oxidation mechanism of the electrode to butyl xanthate is analyzed,which has good electrocatalytic effect and detection effect.Obviously,under the condition of pH=9,the catalytic oxidation current has a good linear relationship with the concentration of butyl xanthate in the range of 1×10^-4 g/L¹×10^-1 g/L,and the detection limit of this method is 2.7×10^-6 g/L.（3）In this paper,a composite platinum nanoelectrode was successfully prepared by thermal cracking and electrochemical methods.The electrode was tested for trace hydrogen peroxide（H₂O₂）.The results show that the electrode has a good linear response to H₂O₂ in the concentration range of 20μmol/L¹000μmol/L,the detection limit of this method is 0.471μmol/L.