Preparation method and application for Au and C co-doping visible-light response photocatalytic electrode

The invention discloses a preparation method and application for an Au and C co-doping visible-light response photocatalytic electrode. The preparation method comprises the following steps that 1, an NF-TiO2 electrode is immersed into a chloroauric acid solution and taken out for air drying; a Na2SO4 solution is used as an electrolyte, a carbon rod is used as an anode, a Pt plate is used as a cathode, and electrolysis is performed in a thermostatic water bath to obtain a black electrolyte containing C; 2, in the obtained black electrolyte containing C, the Pt plate is used as an anode, the electrode obtained after air drying is performed in the step 1 is used as a cathode, and electrolytic deposition is performed in the thermostatic water bath to obtain an Au-C/NF-TiO2 electrode. The visible-light response photocatalytic electrode is used for treating waste water containing Cr. In the waste water containing Cr (VI), the Au-C/NF-TiO2 electrode is used as the anode, a Ti plate is used as a cathode, the pH value of the waste water is adjusted, stirring is performed for 20-40 min at a dark place, voltage is applied after adsorption equilibrium is achieved, and reaction is performed under visible light. The photocatalyst preparation method is simple, good in photoproduction electrons and hole separation effect and high in light current, good in treatment effect of waste water containing Cr (VI), and free of secondary pollution.