“…<Scheme 3> 5,10,15,20-Tetrakis(2,6-dichloro-3-chlorosulfophenyl)porphyrin and its Sn and Zn complexes were also successfully used in the photodegradation of 4-chlorophenol and 2,6-dimethylphenol (Monteiro et al 2005). Likewise, silica microspheres functionalized with 5-(4-allyloxy)phenyl-10,15,20-tri(2,6-dichlorophenyl)porphyrin were used to oxidize 1,5-dihydroxynaphthalene under visible light irradiation in aerated aqueous solution (Cai et al 2009). Visible light photocatalysis using SiO 2 immobilized water-soluble and -insoluble tin porphyrins degraded 4-chlorophenol and Acid Orange 7 in water.…”