Bismuth oxyiodide is a new photocatalytic material with better formaldehyde photocatalytic degradation than titanium dioxide.By loading bismuth oxyiodide over diatomite,the photocatalytic material that had high potential application for formaldehy purif icatory was obtained.Diatom mud was synthesized by using diatomite loaded with bismuth oxyiodideas photocatalytic material,and its removal on formaldehyde in indoor air and purification persistence were discussed.The result showed that diatom mud had an excellent capacity for formaldehyde purification under the condition of ambient temperature ...