Structure determines performance: isomeric Ti-MOFs for photocatalytic synthesis of hydrogen peroxide

NH₂-UiO-66(Ti) and NH₂-MIL-125(Ti) were successfully prepared by using post-synthesis exchange (PSE) and hydrothermal methods, and then these frameworks were tested for photocatalytic hydrogen peroxide production in pure water under visible light. NH₂-MIL-125(Ti) exhibits superior activity compared to NH₂-UiO-66(Ti) due to its shorter Ti-O bond. In addition, NH₂-MIL-125-D (defective) demonstrates a high photocatalytic yield of hydrogen peroxide owing to the presence of defect-rich titanium rich sites.