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In contrast, metal oxides such as SnO2, WO3, and V2O5 also showed limited oxidizing ability, even though the valence bands of these metal oxides are deep enough to create OH• radicals that decompose most organic compounds. This is because their conduction bands are lower than those of TiO2, SrTiO3, and ZnO, and the photogenerated electrons of these metal oxides are not high enough to be trapped by adsorbates such as oxygen molecules on the surface. Therefore, it is suggested that the efficiencies of charge separation in these metal oxides are low, leading to their inability to decompose methylene blue. ÕâÊÇһƪÎÄÏ×É϶Բ»Í¬µÄÑõ»¯Îï¹â´ß»¯»îÐÔÇ¿ÈõµÄ½âÊÍ¡£µ«ÊÇÎÒ¶Ô¡°the photogenerated electrons of these metal oxides are not high enough to be trapped by adsorbates such as oxygen molecules on the surface¡±Àí½â²»Í¸°¡¡£ Çë´ïÈ˴ͽ̣¡²»Ê¤¸Ð¼¤£¡£¡
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