Optimized photocatalytic degradation of caffeic acid by sol–gel TiO2

摘要: TiO2 anatase powder was prepared by means of the sol–gel method with titanium(IV) butoxide as precursor. The formation a tetragonal crystal structure at 500 °C confirmed X-ray diffraction. characterization samples synthesized complemented scanning electron microscopy, diffuse reflectance infrared Fourier transform spectroscopy, nitrogen adsorption–desorption isotherms (Brunauer–Emmett–Teller) and spectroscopy. photocatalytic activity evaluated in degradation caffeic acid aqueous solution under ultraviolet radiation. A central composite circumscribed design used to assess weight experimental variables, pH amount catalyst percentage degraded optimal conditions. optimized conditions were found be = 5.2 load 1.1 g L−1. Under these more than 90% achieved after 30 min lamp irradiation. At this time mineralization reached almost 60%.