Photocatalyst filter screen can produce more than 99% decomposition effect on formaldehyde and organic matter in visible light, and because the process is to adopt the principle of contact-catalytic oxidation, catalyst components play the role of medium, so photocatalyst components almost never change, so no treatment can be used for a long time. Compared with the traditional aluminum-based honeycomb network, the effective contact area has been greatly improved, and the ability to receive ultraviolet light has also been greatly improved. The filter screen of rough sponge is made of the ordinary open soft bubble through the network processing. The network treatment removes the original mask or wall film between the foam network and obtains the main skeleton network structure. The mesh bubble has many special USES, such as filter material, fuel tank filling material and fabric processing material. Many new functional materials, such as reticulated ceramics, reticulated metals and reticulated activated carbon, can be made by using the reticulated vesicle as the framework.