Phosphotungstic acid, an electron acceptor, is in favour of titania photocatalysis, the photodegradation rate of methyl H_ PW_ O_(0)(HPW)作为电子受体,有利于TiO_光催化反应,浓度为0．0 mmol／L时甲基橙光催化降解速率是未加入电子受体的．7倍。