Study On Preparation And Electrochemical Performance Of RuO_2O2 / SnO2 / TiO2 / TiO2 Graphite Anodes

Electro-catalytic advanced oxidation process(EAOP) is a kind of high-efficiency water treatment technology. The treatment of low concentration organic wastewater by low voltage could not only obtain a good degradation effect, but also be energy-saving and cost reduction. Ti O2/Nano-G, Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G composite were prepared by a sol-gel method in the thesis. Ti mesh as the base in the anode and Ti-C as the cathode, the electro-catalytic degradation effect of methyl orange(MO) and ceftriaxone sodium of three composite electrodes were investigated.Ti O2/Nano-G, Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G composite were characterized by XPS, FT-IR, XRD, Raman, BET, SEM, TEM. The results showed that Ti-O-C bond was formed, Ti O2, Ru O2 and Sn O2 particles were distributed on the surface of the Nano-G uniformly, and enough specific surface area was found in the three composites. Ti O2/Nano-G, Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G electrodes were characterized by CV and EIS, the result showed that Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G electrodes have better oxidizability and electroconductibility. The yield of hydroxide radical was analyzed and tested, the investigate indicated Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G electrodes product more ·OH than Ti O2/Nano-G electrode, what’s more, better degradation effect of organic pollutant was found on Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G electrodes.Electro-catalytic oxidation systems were set up with the Ti O2/Nano-G anode and the Ti mesh cathode, and the electro-catalytic oxidation reaction conditions for the degradation effect of MO were investigated. The results showed that the best reaction conditions were that the voltage was 2.0V, Na2SO4 concentration was 0.1mol·L-1,preelectrolysis. The degradation rate of 10mg·L-1 MO on Ti O2/Nano-G,Ru O2-Ti O2/Nano-G and Sn O2-Ti O2/Nano-G electrodes in 30 min was 74.46%, 87.45%and 89.20%, respectively. In the same condition, the degradation of ceftriaxone sodiumin 100 min was 90.3%, 97.3% and 97.6%, respectively.