Modification of TNF@UiO-66 composite by amine functionalized (TEPA) to improve photoconversion of CO2 using visible light: Investigation of intrinsic kinetic study and optimization

Abstract

In this work, 25 % weight percentages of UiO-66 in TiO₂ nanoflower composite was treated with varying quantities of Tetraethylenepentamine (TEPA) to improve photoconversion of CO₂ into fuel using visible light (VL). The results revealed that maximum production rates of CH₄ and CH₃OH on TNF@25 %U-TEPA(2) sample were 64.59 and 2.47 µmol g_cat⁻¹ h⁻¹, respectively, at the optimum conditions of V-LP=150 W, P_CO2 =73 KPa, P_H2O =15 KPa and T=332.15 K. 15 LHHW models were evaluated based on different assumptions of rate determining step and the most abundant surface intermediate to obtain kinetics of the CO₂ photoconversion. The chosen model was the one that was closest to the experimental data. Furthermore, the kinetic rate and adsorption coefficients at T= 298.15–338.15 K and V-LP=150 W were obtained for the best-selected model. Finally, at T= 298.15–338.15 K, the activity energy of the produced CH₄ was determined as 3.6 kJ mol⁻¹.