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Multi-user equipment approved in grant 2022/02980-1: gas chromatograph

Abstract

One of the great challenges of modern society is the reduction or conversion of carbon dioxide (CO2) from the burning of fossil fuels or industrial processes. Thus, the development of new technologies for converting CO2 into value-added products becomes fundamental, given this gas is one of the main responsible for the greenhouse effect. In this scenario, CO2 photoconversion can be a viable alternative, both from an environmental and economic point of view, since solar radiation can be used as a light source for the process. Photocatalytic processes involve the irradiation and absorption of light by a semiconductor using a light source with energy equal to or greater than the bandgap energy of the materials. Within this context, this project aims to develop heterostructured semiconductors based on niobium oxide (Nb2O5) and graphitic carbon nitride (g-C3N4), modified with Cu or Zn using different synthesis methods, in order to improve the efficient separation rate of the chargers photogenerated, enhance light-visible absorption, and increase CO2 adsorption capacity on the surface of the materials. The photocatalysts obtained will be applied for the photoconversion of CO2 into products with added value such as carbon monoxide (synthesis gas), methane, methanol, formic acid, among others. A detailed study of the structural, morphological, and electronic properties of the developed materials and of the reaction products formed will also be carried out using various analytical techniques that will enable the understanding of the reaction mechanisms involved in the process. In addition, two photoreactor configurations will be tested in different phases (solid-liquid and solid-gas), aiming to increase in the efficiency of the process. Thus, the aim is to develop a robust, efficient and low-cost photocatalyst, as well as to obtain data that will allow, in the future, a scale-up of this technology. (AU)

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