PROBLEM TO BE SOLVED: To provide an enlargeable system using a photoreaction catalyst facilitating collection, and to provide a method for producing the system. SOLUTION: This system includes a plant taking in super-minute particle diamond, and in this case, a photoreaction catalyst is preferably supported on a super-minute particle diamond surface. Preferably 0.1-20 pts.wt. of the photoreaction catalyst is included when bringing the total weight of the super-minute particle diamond and the photoreaction catalyst to 100 pts.wt. The method for producing the plant taking in super-minute particle diamond includes the process of soaking a plant in a solution where super-minute particle diamond of an average disperse particle diameter of≤10 nm is dispersed so as to take in the super-minute particle diamond. In this case, preferably≤80 pts.wt. of the super-minute particle diamond is included when bringing the weight of the solution to 100 pts.wt. COPYRIGHT: (C)2011,JPO&INPIT
