To improve the photocatalytic effect of TiO 2 and the possibility of recycling, three different types of commercial activated carbon (AC) are used to prepare the TiO 2 /AC composite photocatalyst using the sol-gel method. The properties and catalytic activity of TiO 2 /AC composite are evaluated in comparison with bare TiO 2 , based on several characterization techniques and methylene blue (MB) photodegradation studies. The results show that the addition of AC

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