Ménesi Judit, Körösi László, Bazsó Eva, Zöllmer Volker, Richardt André, Dékány Imre
Department of Colloid Chemistry and Nanostructured Materials Research Group of Hungarian Academy of Sciences, University of Szeged, H-6720 Szeged, Aradi Vertanuk tere 1, Hungary.
Chemosphere. 2008 Jan;70(3):538-42. doi: 10.1016/j.chemosphere.2007.06.049. Epub 2007 Aug 14.
TiO2/Ca-montmorillonite composites were prepared by wet grinding in an agate mill. Positively charged TiO2 nanoparticles are bound to the surface of the negatively charged montmorillonite layers via heterocoagulation; the clay mineral is used as adsorbent and support for the photooxidation process. Aquatic solution of 0.5mM phenol was degraded by irradiation with UV-VIS light (lambda=250-440 and 540-590 nm) in suspensions of TiO2-clay composites and significant photodegradation was observed at 40-60% TiO2/Ca-montmorillonite compositions. Synergistic effect was detected at solid/liquid interface for degradation of phenol and at solid/gas interface in the recycling flow reactors for photooxidation of ethanol and toluene vapors.
通过在玛瑙研磨机中湿法研磨制备了TiO₂/钙蒙脱石复合材料。带正电荷的TiO₂纳米颗粒通过异凝作用与带负电荷的蒙脱石层表面结合；粘土矿物用作光氧化过程的吸附剂和载体。在TiO₂-粘土复合材料悬浮液中，通过紫外-可见光（波长=250-440和540-590nm）照射降解0.5mM苯酚的水溶液，在TiO₂/钙蒙脱石组成含量为40-60%时观察到显著的光降解。在固/液界面检测到苯酚降解的协同效应，在循环流动反应器的固/气界面检测到乙醇和甲苯蒸汽光氧化的协同效应。
