CONVERSÃO FOTOELETROCATALÍTICA DE CO2 E BIOGÁS EM PRODUTOS DE INTERESSE ENERGÉTICO UTILIZANDO SEMICONDUTORES NANOESTRUTURADOS DE Ti/TiO2 MODIFICADOS COM ÓXIDO DE COBRE

Abstract

Recebido em 13/06/2019; aceito em 01/11/2019; publicado na web em 16/01/2020 PHOTOELECTROCATALYTIC CONVERSION OF CO 2 AND BIOGAS INTO PRODUCTS OF ENERGY INTEREST USING Ti/TiO 2 NANOSTRUCTURED SEMICONDUCTORS MODIFIED WITH COPPER. This work describes the superficial modification of Ti/TiO 2 nanotubes by copper oxide electrochemical deposition, in different temperatures (25 and 65 ºC), and its application on the photoelectrocatalytic conversion of CO 2 and biogas in products of energy interest. The different temperatures deposition resulted in the formation of different geometric forms on the surface of Ti/TiO 2 nanotubes and in different photoelectrocatalytic activities.The photoelectrocatalytic conversion in 0.1 mol L -1 Na 2 SO 4 with application of -0.1 V and UV irradiation resulted in the formation of acetone and methanol from CO 2 and acetone and ethanol from biogas, being that the acetone production was higher for the semiconductor synthesized at 65 ºC, while the methanol and ethanol production was higher for the semiconductor at 25 ºC. The different characteristics observed, as well as the preferential formation of different products of photoelectrocatalytic reactions for semiconductors synthesized with different electrochemical deposition temperatures are discussed. Keywords: photoelectrocatalysis; conversion of CO 2 and biogas; modification of Ti/TiO 2 nanotubes; copper oxide.