Investigation of photocatalytic degradation of phenol by Fe(III)-doped TiO2 and TiO2 nanoparticles

In this study fe (iii)-doped tio2 nanoparticles were synthesized by sol–gel method at two atomic ratio of fe/ti,0.006 and 0.034 percent. then the photoactivity of them was investigated on degradation of phenol under uv( < 380 nm) irradiation and visible light ( > 380 nm). results showed that at appropriate atomic ratio of fe to ti (%0.034) photoactivity of fe(iii)–doped tio2 nanoparticles increased. in addition, the effects of various operationalparameters on photocatalytic degradation, such as ph, initial concentration of phenol and amount of photocatalystwere examined and optimized. at all different initial concentration, highest degradation efficiency occurred atph = 3 and 0.5 g/l fe(iii)–doped tio2 dosage. with increase in initial concentration of phenol, photocatalyticdegradation efficiency decreased. photoactivity of fe (iii)-doped tio2 under uv irradiation and visible light atoptimal condition (ph = 3 and catalyst dosage = and 0.5 g/l) was compared with p25 tio2 nanoparticles. resultsshowed that photoactivity of fe(iii)-doped tio2 under visible light was more than p25 tio2 photoactivity, but it wasless than p25 tio2 photoactivity under uv irradiation. also efficiency of uv irradiation alone and amount of phenoladsorption on fe(iii)-doped tio2 at dark condition was investigated.