二氧化铈催化分解水中臭氧的性能研究

Study on Ozone Decomposition Catalyzed by Cerium Dioxide

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。

Static experiments were carried out to study the mechanism of ozone decomposition catalyzed by cerium dioxide, and to investigate the influences of temperature, hydrogen peroxide, sulfate and the dosage of cerium dioxide on the ozone decomposition. The results show that compared with ozone alone and the presence of iron oxyhydroxide, the decomposition rate of ozone by cerium dioxide is very fast within 1 min after beginning of reaction because of the oxidation-reduction reaction of ozone with CeO2-x. Cerium dioxide inhibits the ozone decomposition at high temperature （35 ℃ ） and 03 ＋ H2O2 system. The inhibitory effect of cerium dioxide on the ozone decomposition is gradually eliminated after adding sulfate. Increasing the dosage of cerium dioxide can only accelerate ozone decomposition at the beginning of reaction, and the subsequent ozone concentration is stable.