Photofunctional silica gel beads have been developed as environmental conscious materials. The hydroxybenzophenone (Hbp) chromophore–bonded silica gel (SiO
2) beads (
1) were developed as UV–absorbents. 4,5–Dimethoxy–2–nitrobenzyloxycarbonyl (Nbz) chromophore–bonded SiO
2 (
2) was prepared in order to control the amounts and sites of functional group by a use of Nbz as a photolabile protecting group. Diacetoxyantimony tetraphenylporphyrinato chromophore (Sb(OAc)
2tpp)–bonded SiO
2 (
3a) was packed in micro–channel reactor. The photoreaction of
3a with Et
2NH induced the demetallation to give free base tetraphenylporphyrin chromophore (H
2tpp)–bonded SiO
2 (
3b). The color change of the H
2tpp–H–adsorbed SiO
2 (
4) under dry and humidity conditions was applied to a new type of humidity indicator without CoCl
2. The Sb(OH)
2tpp–H–adsorbed SiO
2 (
5) was used as visible light driven photocatalysts in dechlorination of 4–chlororophenol, epoxidation of cyclohexene, and bactericidal reaction of
E. coli. Also dimethoxophosphorus tetraphenylporphyrine (P(OMe)
2tpp–H)–adsorbed SiO
2 (
6b) was practically used to sterilization
Legionella species naturally occurring in fountain.
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