Under uv - irradiation of the xw11 / sio2 ( x = p , si , ge ) composite films , all as - synthesized films exhibited high photocatalytic activity on the degradation of aqueous formic acid ( fa ) . it has been shown that aqueous fa can be totally degraded into co2 and h2o . the photocatalytic reactions followed langmuir - hinshelwood first - order kinetics 結(jié)果表明,在溫和條件下(常溫、常壓和自然酸度) ,用近紫外區(qū)的光能輻射以上體系時,三種多金屬氧酸鹽復合膜材料都具有較高的活性,而且fa可被完全礦化為二氧化碳和水。