Kinetic study for removal of methyl orange on exhausted catalytic converter

Methyl orange, MO is one of the harmful dyes which is used widely in the laboratories, in the textile coloring and other applications, therefore its concentration must be reduced before disposing to sewage, rivers ….et. Adsorption method is one of the cheapest, available, applicable and simple in handling to treat polluted water. Catalytic converter (CC) used in cars exhaust systems to treat emitted gases from combustion processes in engines is a candidate of this study to adsorb MO from aqueous solution. The reason for using CC as an adsorbent, is due to possessing functional merits such as some transition metals that have unfilled orbitals as well it is cheap and available. It was found that CC can give a good removal of dye, about 70% at 308 0K, pH=7 and adsorption time of 45 min., this is expected because it is considered as an exhausted and not a new one. It was found, that adsorption of MO on CC follows the pseudo second order kinetic.