Photocatalytic ecomaterial is prepared by coating TiO₂ transparent film on silica-gel bead. When irradiated by light, the photocatalytic ecomaterial generates strong oxidative potential and almost all organic substances are decomposed to water, carbon dioxide and others. An apparatus for decomposition of dioxins is constructed with the ecomaterial. The removal efficiency over 99% of dioxins has been obtained. The novel photocatalytic decomposition method using silica-gel beads coated by TiO₂ has been applied for the highly efficient treatment of water pollutants, acidic gases, and rank odor substances in environment.