Novel Co2+ passivated carbon nanodots with up-conversion effects combined with NH2-MIL-125 for improving photocatalytic NO purification and hydrogen evolution

Synergistic Enhancement of Photocatalytic H2 Evolution over NH2-MIL-125 Modified with Dual Cocatalyst

“…Combine with the above results of photocatalytic water splitting to H 2 , a series of systematic characterization analysis, and mechanism research, the possible photocatalytic routes (eqs –) are proposed as follows: The photocatalytic unit (metal-oxy cluster) of NH 2 -MIL-125 is excited by visible light and produces electron–hole pairs (eq ). With the help of a dual cocatalyst (CDs and Pt), photogenerated electrons (e – ) are captured by H + to obtain H 2 (eq ). Meanwhile, TEOA is oxidized by photogenerated holes (h + ) to yield TEOA + (eq ).…”

“…However, most of the photocatalysts still exist shortcomings such as susceptibility to photo corrosion, rapid electron–hole pairs recombination, and limited light response range, further resulting in weak photocatalytic activity. − Therefore, it is necessary to develop efficient and green photocatalysts to overcome these hurdles. Fortunately, among all the above-mentioned photocatalysts, Metal–organic frameworks (MOFs), integrating metal ions or clusters with organic ligands, − are considered promising photocatalysts, owing to their large specific surface area, tunable structure, and high porosity. − In a variety of MOFs, NH 2 -MIL-125 has merits with low price, high thermal stability and greenest, etc . Moreover, the band gap (2.6 eV) of NH 2 -MIL-125 is reduced and the light absorption range is extended to the visible light region (approximately 46% of sunlight) owing to NH 2 -MIL-125 bearing with electron-donating group. , As a result, NH 2 -MIL-125 is widely used in the field of photocatalysis to elevate the photocatalytic performance.…”

Research progress of MIL-125 and its modifications in photocatalytic hydrogen evolution

“…Their optical property depended on their size, edge shape, surface ligands, and defects. 93,94 He et al 88 loaded Co 2+ -passivated carbon nanodots on the surface of MIL-125-NH 2 via simple solution mixing preparation (Fig. 6(f)), and the carbon nanodots with a particle size of mainly about 1.6-1.8 nm were evenly distributed on the surface of MIL-125-NH 2 .…”