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通过静态试验,初步探讨了CeO2催化分解水中臭氧的机理,并考察了温度、H2O2、SO24-以及不同CeO2投量对CeO2催化分解臭氧的影响。结果表明,相对于羟基氧化铁催化分解臭氧以及单独分解臭氧而言,当以CeO2为催化剂时,在反应开始后的1 m in内,由于臭氧与CeO2-X发生氧化还原反应,臭氧分解速率非常快;CeO2抑制了O3+H2O2体系以及高温(35℃)下臭氧的分解,投加SO24-后,这种抑制作用逐渐消除;增加CeO2投量只加快了反应初期臭氧的分解,之后臭氧浓度仍较稳定。
Through the static test, the mechanism of catalytic decomposition of ozone in water by CeO2 was discussed. The effects of temperature, H2O2, SO4- and different amounts of CeO2 on the catalytic decomposition of ozone were investigated. The results showed that compared with the catalytic decomposition of iron oxyhydroxide and the decomposition of ozone alone, when CeO2 was used as a catalyst, the ozone decomposition rate was very low due to the redox reaction between ozone and CeO2-X within 1 min after the start of the reaction Fast; CeO2 inhibited O3 + H2O2 system and the decomposition of ozone at high temperature (35 ℃), after the addition of SO24-, this inhibition gradually eliminated; increasing the dosage of CeO2 only accelerated the decomposition of ozone in the initial stage of reaction, More stable.