Sinergistic effect of titanium dioxide and iron oxide aerosols in adsorption and photocatalytic oxidation of dimethyl methylphosphonate

Kinetics of adsorption, dark and photocatalytic destruction of dimethyl methylphosphonate (DMMP) vapors was investigated on the surface of nanosized FeOOH (3 nm) and mixture of FeOOH with TiO₂ (5 nm) (1: 1) in aerosol state in a closed chamber. FeOOH aerosol adsorbs DMMP (100 ppm) with characteristic time 32 s and does not show photocatalytic activity. Adsorbed DMMP undergoes hydrolysis with formation of gaseous methanol with characteristic time 11 min, while mixed FeOOH-TiO₂ aerosol adsorbs DMMP and converts it into CO and CO₂ under the action of UV light.