ABSTRACT: Cobalt(II) complex of 5, 10, 15, 20 tetrakis [4-(hydroxy)phenyl] porphyrin [Co(II) TP-OHPP] 1, [Co(II) TP-OHPP]/CPTES-Bentonite Clay 2 composite, [Co(II)TP-OHPP]/CPTES-Bentonite Clay/ Chitosan 3 composite, has been used to study the catalytic degradation of a group of azo dyes (e.g., Methyl Orange, Methyl Red, and Orange II) by hydrogen peroxide in an aqueous solution. 1HNMR, FT-IR, SEM, XRD, TGA, DLS and UV-Vis were used to characterize the structures and characteristics of the soluble and supported catalyst. The UV-Vis spectra of the reaction mixture were recorded at λmax = 464, 505, and 485 nm for M.O, M.R, and O II dyes, respectively, in order to track the oxidation reaction. [Co(II)TP-OHPP]/CPTES-Bent/Cs 3 composite, shows the highest supported catalyst in the degradation p
