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Updated: Feb 14, 2026

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
Published on: June 12, 2019
TiO₂@PEI-Grafted-MWCNTs Hybrids Nanocomposites Catalysts for CO₂ Photoreduction
Caterina Fusco1, Michele Casiello2, Lucia Catucci3
1ICCOM-CNR (Istituto di Chimica dei Composti OrganoMetallici - Consiglio Nazionale delle Ricerche), SS Bari, Via Orabona 4, 70126 Bari, Italy. fusco@ba.iccom.cnr.it.
Abstract:
Anatase (TiO₂) and multiwalled carbon nanotubes bearing polyethylenimine (PEI) anchored on their surface were hybridized in different proportions according to a sol-gel method. The resulting nanocomposites (TiO₂@PEI-MWCNTs), characterized by BET, XRD, XPS, SEM, and UV techniques, were found efficient catalysts for CO₂ photoreduction into formic and acetic acids in water suspension and under visible light irradiation. PEI-grafted nanotubes co-catalysts are believed to act as CO₂ activators by forming a carbamate intermediate allowing to accomplish the first example in the literature of polyamines/nanotubes/TiO₂ mediated CO₂ photoreduction to carboxylic acids.
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