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以大肠杆菌(Escherichia coliJM 109)为研究对象,通过细菌的灭活实验研究负载型TiO2/活性炭(TiO2/AC)的灭菌性能,并利用XRD、BET和SEM对材料的晶型、晶粒尺寸、比表面积和吸附在材料上的细菌分布形态及数量进行分析。结果表明:吸附在TiO2/AC上的大肠杆菌数比吸附在活性炭和TiO2都多。TiO2/AC对E.coli光催化灭活率比TiO2粉末和P25高,制备材料的热处理温度500℃和光催化反应中光强40 W都分别使TiO2/AC的光催化活性达到最大,在光催化灭活E.coli过程中,KH2PO4使催化剂活性降低程度比NaHCO3大,而两者使TiO2/AC催化活性降低程度比TiO2小,但NaHCO3对催化活性的影响是可逆的。
The Escherichia coli JM 109 was used as the research object to study the bactericidal activity of TiO2 / activated carbon (TiO2 / AC) by inactivation experiments. The crystal structure, crystal size , Specific surface area and the morphology and quantity of bacteria adsorbed on the material were analyzed. The results showed that the number of E. coli adsorbed on TiO2 / AC was higher than that on activated carbon and TiO2. The photocatalytic activity of TiO2 / AC on E.coli was higher than that of TiO2 and P25. The heat treatment temperature of the prepared material was 500 ℃ and the light intensity of 40 W in the photocatalytic reaction, respectively, to maximize the photocatalytic activity of TiO2 / AC. Under photocatalysis In the process of inactivating E.coli, KH2PO4 reduced the activity of the catalyst more than that of NaHCO3. Both of them reduced the catalytic activity of TiO2 / AC less than that of TiO2, but the effect of NaHCO3 on the catalytic activity was reversible.