| 摘要 |
PROBLEM TO BE SOLVED: To obtain activated carbon good in the removal capacity of a harmful substance in water or a gaseous phase under the irradiation with infrared rays or solar rays by using activated carbon having lead oxide immobilized on the surface thereof. SOLUTION: A carbonaceous material such as wood or coal is carbonized and subsequently activated to obtain activated carbon. Zinc oxide is allowed to be present on the surface of this activated carbon by a surface potential method or a binder. At this time, lead oxide with a particle size of 5μm or less is added to the surface of activated carbon in an amt. of 0.1-30wt.% on the total wt. of activated carbon and zinc oxide. By this constitution, activated carbon is enhanced in the removal capacity of a harmful substance in water or a gaseous phase to a large extent under the irradiation with ultraviolet rays or solar rays. As the raw material of this activated carbon, wood, sawdust thereof, petroleum heavy oil of fossil fuel, pitch, various resins or a waste tire are used. Zinc oxide is a N-type semiconductor and excited by light with a wavelength of 385nm or less to develop photocatalytic action to contribute to the enhancement of harmful substance decomposing and removing capacity of this activated carbon. |
