Optimalizace fotokatalytické redukce CO2 s využitím TiO2: Nové perspektivy pro udržitelnou chemii

Abstract

This diploma thesis deals with the photocatalytic reduction of CO2 in the presence of TiO2 and CeO2 based photocatalysts. The investigated photocatalysts were pure TiO2, CeO2, TiO2/CeO2 composite photocatalyst, surface modified CeO2 nanoparticles treated with diethylenetriamine (DETA/CeO2) and ethylenediamine (EDA/CeO2). The photocatalysts were characterized by XRD, ATR-FTIR, TEM, SEM-EDX, UV-VIS DRS and photocurrent spectroscopy. The photocatalytic experiments were carried out in a batch stainless steel photoreactor under UVC light irradiation. The gaseous products were detected CH4, CO, and H2, which were analyzed on GC/BID. The results show that the photocatalyst TiO2 exhibited the highest selectivity towards the photocatalytic CO2 reduction products (CH4 and CO), while CeO2 and especially DETA/CeO2 and EDA/CeO2 showed higher activity for photocatalytic water splitting and H2 production. The TiO2/CeO2 composite photocatalyst proved to be an effective material in terms of photocurrent stability and charge carrier separation. This thesis provides insight into the CO2 reduction behaviour of different types of photocatalysts and confirms their potential for future applications, especially if these systems are optimised for operation under solar irradiation.