Improved efficiency of sol–gel synthesized mesoporous anatase nanopowders in photocatalytic degradation of metoprolol

Abstract

The structural and morphological properties of mesoporous anatase nanopowders, synthesized by sol–gel method, have been modified by varying the duration of calcination, in order to obtain more efficient photocatalyst than Degussa P25 in the degradation of relatively large pollutant molecules (>1nm in size). According to X-ray diffraction analysis, the crystallite size was increased from 13 to 17.5nm with the increase of calcination time from 1 to 7h. The analysis of nitrogen sorption experimental data revealed that all samples were mesoporous, with a mean pore diameters in the range of ∼5–9nm. The corrugated pore structure model was employed to evaluate pore structure tortuosity. Nanopowder properties have been related to the photocatalytic activity, tested in the degradation of metoprolol tartrate salt, selective β1-blocker used in a variety of cardiovascular diseases, with molecular size of 0.610nm×1.347nm. The study has demonstrated that samples calcined for 4 and 5h have displayed higher photocatalytic performance than Degussa P25, whereas the sample calcined for 3h has shown comparable activity.