Evaluation of TiO2/MgO heterojunctions in CO2 photoreduction

Reference	Presenter	Authors (Institution)	Abstract
05-011	Gelson Tiago dos Santos Tavares da Silva	Torres, J.A.(Brazilian Agricultural Research Corporation, São Carlos, SP, Brazil); Nogueira, A.E.(Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Reserach in Energy and Materials (CNPEM), Campinas, SP, Brazil); da Silva, G.T.(Federal University of São Carlos /Brazilian Agricultural Research Corporation); Lopes, O.F.(University of Sao Paulo); de Oliveira, C.R.(Brazilian Agricultural Research Corporation, São Carlos, SP, Brazil); Santos Junior, T.d.(Universidade Federal de São Carlos);	TiO2/MgO heterostructures are highly efficient in CO2 photoreduction reactions, mainly due to the high capacity of MgO in adsorbing these molecules. In this way, the MgO was obtained by the calcination of Mg(NO3)2.6H2O and TiO2 by a hydrothermal method. The semiconductors were mixed in different proportions (m/m) and calcined to obtain the heterostructures. It was observed that the presence of MgO favored the photoreduction of CO2 in the heterostructure containing 1% of this oxide, mainly in basic solution. In addition, TiO2/MgO 1% presented expressive selectivity for both CH4 and CO, HCOO- and CH3COO-, confirming that the addition of MgO increases the process efficiency compared to pure TiO2.
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