2002 Volume 9 Issue 301 Pages 485-491
The technique to make calcium carbonate a photocatalyst by the surface treatment which used the fatty acid zinc and the surface oxidation was studied. The relationship between the kind of the fatty acid zinc and the state of the zinc introduced on the surface was investigated. In addition, the relation between the state of zinc and the photocatalytic ability was discussed. The surface of calcium carbonate was able to make a photocatalyst by using the process of the adsorption of the fatty acid zinc and the surface oxidation. It has been understood that the structure of the zinc oxide generated with the change of an organic chain length of the fatty acid zinc is different. The grainy zinc oxide in the sample which used zinc stearate was generated, and layered zinc oxide in the sample which used zinc acetate was generated, respectively.The layered zinc oxide was excellent in the photocatalytic ability compared with the grainy zinc oxide. It was presumed that this cause was a difference of degree of crystallinity of the zinc oxide. It has been understood that the calcium carbonate covered with one layer of zinc oxide onto the surface has the same degree of photocatalytic ability as a zinc oxide.