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1.Experimental principle
This experiment uses the principle of electrochemical catalytic oxidation and uses BDD electrodes as the core reaction device to finally convert the organic matter in the water sample into CO2 and H2O.
2.Electrodes
2.1 Anode: Two BDD electrodes with a single crystal silicon substrate, the surface area of the film is 200cm2.
2.2 Cathode: Three titanium sheets.
3．Experimental operation
Take 1L of water sample into the beaker, put the BDD electrode module (the actual utilization area of the anode is 140cm2, the area ratio of the cathode and anode plate is 2 to 1), connect the power supply, adjust the current intensity to 8A, the duty cycle to 80%, and the frequency 4000Hz; start to degrade. During the degradation process, the water sample is stirred with a magnetic stirrer to make it uniform. Take samples at regular intervals, record current and voltage values, and measure temperature and pH.
4．Experimental phenomenon
The original water sample is dark brown, turbid, and has a strong odor; more foam is produced during the degradation process, and a small amount of brown precipitate is produced; after degradation, the water sample becomes clear and the pH value increases slightly.
5．Results and analysis
