Iron heterogeneous photocatalysis

Somorjai, G.A. Salmeron, M. (1986) Surface properties of catalysts. Iron and its oxides. Surface chemistry, photochemistry and catalysis. In Pelizzetti, E. Serpone, N. (eds.) Homogeneous and heterogeneous photocatalysis. D. Reidel Publ. Co., Doordrecht, The Netherlands, NATO ASI Series C, 174 445-478... 

Non-thermal plasma [129] Electrohydraulic discharge—ultrasound [2,130-133] Oxidation in sub/and supercritical water [134-137] Zero-valent iron [94,138,139] Ferrate (K2Fe04, Fe(VI)) [140] Heterogeneous photocatalysis... 

Morgada de Boggio, M.E., Levy, I.K., Mateu, M., Bhattacharya, P., Bundschuh, J., and Litter, M.I. Low-cost technologies based on heterogeneous photocatalysis and zerovalent iron for arsenic removal in the Chacopampean plain, Argentina, in J. Bundschuh, M.A. Armienta,... 

Both photosensitized reacticms and heterogeneous photocatalysis have been the focus of many studies and reviews for the degradation of organic and inorganic species in natural terrestrial surface water. This review will discuss their potential importance in the atmosphere for two distinct cases — photochemistry of mineral dust (which contains oxides able to initiate photocatalysis) and organic or carbonaceous aerosols (which contain aromatic compounds or humic like substances able to act as photosensitizers). Additionally, direct photochemistry of unconventional precursors, i.e., iron-dicarboxylic acid anionic complexes, will also be dealt with. 

There has been recent interest in a somewhat different aspect of adsorption and reaction on metal oxides photocatalysis. The interest stems partially from that role that some transition-metal oxides can play in photochemical reactions in the atmosphere. Atmospheric aerosol particles can act as substrates to catalyze heterogeneous photochemical reactions in the troposphere. Most tropospheric aerosols are silicates, aluminosilicates and salts whose bandgaps are larger than the cutoff of solar radiation in the troposphere (about 4.3 eV) they are thus unable to participate directly in photoexcited reactions. However, transition-metal oxides that have much smaller bandgaps also occur as aerosols — the most prevalent ones are the oxides of iron and manganese — and these materials may thus undergo charge-transfer excitations (discussed above) in the pres-... 

---