Visible-Light-Driven Photoreduction of CO.sub.2 to CH.sub.4 with H.sub.2O Over Amine-Functionalized MIL-125

This study focused on the photocatalytic CO.sub.2 to methane (CH.sub.4) with H.sub.2O over NH.sub.2-MIL-125(Ti) under visible light. It shows that the CH.sub.4 yield of NH.sub.2-MIL-125(Ti) reaches as high as 15.83 [micro]mol h.sup.-1 [Formula omitted], which is 82.6% higher methane (CH.sub.4) production than that of MIL-125(Ti). The amine functionalization promotes the CO.sub.2 adsorptions on amine groups and the electron transfer between Ti and organic clusters. The H.sub.2O acts as a good reductant in this catalytic system, which can provide the electrons and reduce the Ti.sup.4+ to Ti.sup.3+. This study provided a potential method to enhance the performance of photocatalytic CO.sub.2 conversion with H.sub.2O for the metal organic frameworks.