Device (1) for air purification with slats (2) with photocatalytic properties, comprising: - a duct (4) delimited by an enclosure provided with at least one plane (20) transparent or translucent to an incident light, said duct (4 ) includes two opposite ends each with a conduit opening (5) and the conduit (4) determines an interior space (6)； - a plurality of slats (2) located inside (6) the duct (4) and arranged transversely to the duct (4), the slats (2) partially seal the interior space (6)； each slat (2) defines one or more slat openings (7) for the passage of air flow therethrough, said slat openings (7) of the slat assembly (2) together determine a passage channel (10) air between the two duct openings (5)； and wherein at least some of the slats (2) are photocatalytic slats (2a) that comprise a photocatalytic material at least on a surface partially or totally exposed to incident light through the transparent or translucent plane (20) of the duct (4). )； wherein the facing slats (2) that form a pair of slats (8), said slats (2) that form a pair of slats (8), have the respective openings of the slats (7) located in non-facing areas thus determining that the air passage channel (10) is zigzagging.Dispositivo (1) para depuración de aire con lamas (2) con propiedades fotocatalíticas que comprende: - un conducto (4) delimitado por un cerramiento dotado de al menos un plano (20) transparente o translúcido a una luz incidente, dicho conducto (4) incluye dos extremos opuestos cada uno con una abertura de conducto (5) y el conducto (4) determina un espacio interior (6)； - una pluralidad de lamas (2) localizadas en el interior (6) del conducto (4) y dispuestas transversalmente al conducto (4), las lamas (2) obturan parcialmente el espacio interior (6)； cada lama (2) define una o más aberturas de lama (7) para el paso de flujo de aire a su través, dichas aberturas de lama (7) del conjunto de lamas (2) determinan en conjunto un canal (10) de paso de aire entre las dos abe
