Switching on photocatalytic NO oxidation and proton reduction of NH2-MIL-125(Ti) by convenient linker defect engineering

Dual-Ligand Ti-MOFs with Push–Pull Effect for Photocatalytic H2 Production

“…The strong characteristic peaks at 6.8, 9.8, 11.7, 16.6, and 18.0° belong to the (101), (200), (211), (222), and (312) planes of NH 2 -MIL-125, respectively. , Fourier transform infrared (FTIR) spectra of NH 2 -MIL-125 and three dual-ligand MOFs are shown in Figure b. The characteristic stretching vibration at 3445 cm –1 is attributed to N–H, while the strong band at 1248 cm –1 belongs to the C–N stretching vibration of aromatic amines, indicating that −NH 2 is present in all samples . In addition, a series of characteristic peaks at 1400–1700 cm –1 appear due to the vibration of the carboxylic acid functional group .…”

“…The characteristic stretching vibration at 3445 cm −1 is attributed to N−H, while the strong band at 1248 cm −1 belongs to the C−N stretching vibration of aromatic amines, indicating that −NH 2 is present in all samples. 15 In addition, a series of characteristic peaks at 1400−1700 cm −1 appear due to the vibration of the carboxylic acid functional group. 15 The peaks in the range of 400−1100 cm S2) demonstrates that the N contents of three NH 2 /R-MIL-125 samples are much lower than that of NH 2 -MIL-125, further confirming the introduction of the second ligand.…”

“…15 In addition, a series of characteristic peaks at 1400−1700 cm −1 appear due to the vibration of the carboxylic acid functional group. 15 The peaks in the range of 400−1100 cm S2) demonstrates that the N contents of three NH 2 /R-MIL-125 samples are much lower than that of NH 2 -MIL-125, further confirming the introduction of the second ligand. Dual-ligand MOFs show similar thermogravimetric analysis (TGA) curves (Figure S4) to single-ligand NH 2 -MIL-125, in which the mass decrease in the range of 30−100, 100− 300, and >300 °C can be attributed to the removal of DMF, H 2 O, and MeOH in the pores, ligand decomposition, and MOF structure collapse, respectively.…”

“…Nowadays, lots of current studies are exploited to improve the photocatalytic H 2 evolution performance by promoting the carrier transfer efficiency, such as heterojunction production, − cocatalyst loading, , and defect doping. , For example, Qiao et al prepared the Ni-imidazole framework (NiIm) decorated by CdS nanorods with greatly enhanced photocatalytic H 2 evolution efficiency, which was attributed to strong interactions at the CdS/NiIm interface and the presence of numerous Ni–N 4 active sites on NiIm . However, these strategies often concentrate on single-ligand MOFs, which rely on the introduction of another material to enhance the H 2 evolution rate.…”

Effectively enhanced photocatalytic performance of layered perovskite Bi2NdO4Cl by coupling piezotronic effect

“…Among them, the poor photocatalytic efficiency arising from the high carrier recombination rates has always been a problem in photocatalytic appli-cations. To address this problem, numerous strategies have been adopted, including defect engineering, [10][11][12] precious metal modification, 13,14 ion doping 15,16 and heterojunction structures. 17 Despite much effort, the improvement in photocatalytic efficiency is still limited by the material synthesis procedures, material stability, and low quantum efficiency to some extent.…”