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UV photolysis of aerated aqueous suspensions of TiO 2 (Degussa P25) containing CH 3 OH at pH 8.5 produces HCHO. Addition of CuSO 4 affects the rate of HCHO formation (R HCHO ) in two opposite ways. Below 2μM, R HCHO increases with increasing [CuSO 4 ] while at higher concentrations it slows down. The enhancement of R HCHO at very low [CuSO ...
UV illumination of aqueous TiO 2 suspensions yields hydroxyl radicals which can be trapped by methanol yielding formaldehyde (HCHO). The photonic efficiency of HCHO formation (345+/-35nm cw illumination) in aqueous, oxygenated TiO 2 suspensions (2.4nm diameter TiO 2 particles, Degussa P25 and Sachtleben Hombikat UV 100) containing methanol at pH ca. 1-12 has been determined...
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