investigation of photocatalytic degradation of phenol by uv/tio2 process in aquatic solutions

background : the main objective of this research was to study photocatalytic oxidation of phenol in aquatic solutions by using of uv, tio 2 and the combination of them. phenol compounds are widely used in industries and other daily life. highly toxicity and carcinogenicity of these compounds can causal considerable adverse effects on the aquatic ecosystems and human health. methods : the study was an experimental research and carried out by phenol 100 mg l -1 solution and contact time, ph and amount of tio 2 were considered in photocatalytic system as the basic variables affecting removal efficiencies. phenol concentration in inlet and outlet samples was detected by spectrophotometery at 500nm. results : combination of uv and tio 2 can cause higher efficiencies of phenol removal. the removal efficiencies of uv, tio 2 and uv/tio 2 photocatalytic oxidation system with various operation conditions had a range of 1.8%-19.64%, 2.38%-17.8% and 34.65%-82.91%, respectively. it was found that increasing of tio 2 concentration and contact time and ph , increasing the amount of phenol that oxidized in combined system and maximum removal coefficients obtained in ph=11, 9 h contact time and 0.2 gr of tio 2 . conclusion : combinated uv/tio 2 process may be applied as an effective process for the removal of phenol from aquatic solutions such as industrial wastewaters and polluted water resources.