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Photocatalytic Degradation of Rhodamine B on TiO2/Bentonite Composite under UV-light Irradiation

机译:紫外光下TiO2 /膨润土复合材料上罗丹明B的光催化降解

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TiO2/bentonite samples were prepared via sol-gel method, and calcined at different temperatures. These samples were characterized by X-ray diffraction (XRD), BET method. The photocatalytic activities of the samples were tested by the effect of the rhodamine B(RhB) photodegradation under ultraviolet (UV) irradiation. The results showed that TiO2/bentonite catalysts exhibited about 6.5 % lower efficiency for mineralizing RhB in terms of chemical oxygen demand (COD) changes than the well-known commercial TiO2 photocatalyst P25, while the TiO2/bentonite was much more easier separated from aqueous suspensions than P25 by sedimentation after the reaction, and this catalyst can maintain almost the same activity after being repeatedly used for 8 times.
机译:TiO2 /膨润土样品通过溶胶-凝胶法制备,并在不同温度下煅烧。这些样品通过X射线衍射(XRD),BET法表征。通过罗丹明B(RhB)在紫外线(UV)照射下的光降解作用测试了样品的光催化活性。结果表明,就化学需氧量(COD)的变化而言,TiO2 /膨润土催化剂的RhB矿化效率比著名的商用TiO2光催化剂P25低约6.5%,而TiO2 /膨润土更容易与水悬浮液分离反应后的沉降比P25要好,该催化剂重复使用8次后仍能保持几乎相同的活性。

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