Abstract Different types of commercial titania (P25, P90, PC500, and C-TiO2) were immobilized as single or mixed photocatalyst onto the surface of a natural support material made of cement, clay, and wood fibers. The successful immobilization was studied by different techniques showing a composite material with the mechanical properties of the support material and the photocatalytic behavior of the immobilized titania. The supported photocatalyst showed high mechanical stability and was applied to the photocatalytic degradation of phenol as a model pollutant under UV light irradiation. As the most active photocatalytic material, a mixture PC500 and P90 (comp-PC500/P90) was identified with an apparent pseudo first-order kinetic rate constant (kapp) of 0.010 min−1 at a degradation efficiency of 100%. The catalyst was used several times and showed minor loss in activity during four runs due to degradation intermediates adsorbed to the surface, shown by a color change from white to yellow.

中文翻译：

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粘土、水泥和木材的复合材料作为天然载体材料，用于固定商业二氧化钛（P25、P90、PC500、C-TiO2）以实现光催化苯酚降解

摘要不同类型的商业二氧化钛（P25、P90、PC500 和 C-TiO2）作为单一或混合光催化剂固定在由水泥、粘土和木纤维制成的天然支撑材料的表面上。通过不同的技术对成功的固定化进行了研究，显示出具有载体材料的机械性能和固定化二氧化钛的光催化行为的复合材料。负载型光催化剂表现出较高的机械稳定性，可应用于紫外光照射下苯酚作为模型污染物的光催化降解。作为最活跃的光催化材料，PC500 和 P90 的混合物 (comp-PC500/P90) 被认为具有 0.010 min−1 的表观伪一级动力学速率常数 (kapp)，降解效率为 100%。该催化剂使用了几次，并且在四次运行期间由于降解中间体吸附到表面而显示出轻微的活性损失，表现为从白色到黄色的颜色变化。