Efficient and Sustainable in situ Photo‐Fenton Reaction to Remove Phenolic Pollutants by NH₂‐MIL‐101(Fe)/Ti₃C₂T_x Schottky‐Heterojunctions

Abstract

Metal-organic frameworks (MOFs) with abundant active sites, a class of materials composed of metal nodes and organic ligands, is widely used for photocatalytic degradation of pollutants. However, the rapid recombination of photoinduced carriers of MOFs limits its photocatalytic degradation performance. Herein, Ti 3 C 2 T x nanosheets-based NH 2 -MIL-101(Fe) hybrids with Schottky-heterojunctions were fabricated by in situ hydrothermal assembly for improved photocatalytic activity. The photodegradation efficiencies of the NH 2 -MIL-101(Fe)/Ti 3 C 2 T x (N-M/T) hybrids for phenol and chlorophenol were 96.36 % and 99.83 % within 60 minutes, respectively. The N-M/T Schottky-heterojunction duly transferred electrons to the Ti 3 C 2 T x nanosheets surface via built-in electric fields, effectively suppressing the recombination of photogenerated carriers, thereby improving the photocatalytic performance of NH 2 -MIL-101(Fe). Moreover, the Femixed-valence in the N-M/T led to improvement in the efficiency of the in situ generated photo-Fenton reactions, further enhancing the photocatalytic activity with more generated reactive oxygen species (ROS). The study proposes a highly effective removal of phenolic pollutants in wastewater.[a] C.

Novel double-layer core–shell photocatalyst CdS–TiO2@NH2-MIL-101: enhanced conversion of CO2 and CH4 at ambient temperature

“…The characteristic peaks at 714.0, 718.5, 723.5, and 730.1 eV were the satellite peaks of Fe 2p 3/2 and Fe 2p 1/2 , attributed to the high spin of the Fe (Fe 3+ ) compound. 52 The introduction of TiO 2 and CdS into the structure of the MOF revealed a slight negative shift in the high-resolution spectral peaks of NFT-60 and NFTC-10 compared with that in the Fe 2p spectrum of MOF. This shift was related to the increase in electron cloud density of Fe 3+ ions, whereupon the semiconductor forms a chemical bond with the NH 2 group, causing the lone electron pair on the N atom to shift toward the Fe 3+ ions.…”

AuNP/MIL‐88B‐NH2 Nanocomposite for the Valorization of Nitroarene by Green Catalytic Hydrogenation

“…In order to assess the reduction of nitrophenol with regard to the 12 principles of green chemistry (P1‐P12), a semi‐quantitative method was first applied: the green star (see Table S3) [14] . Figure 4 shows the results for an ideal green catalyst which does not require NaBH 4 to achieve a high conversion yield (A); our composite without using NaBH 4 (B, very low conversion yield); the composite under the optimized conditions using NaBH 4 (C); and, lastly, the recently reported AuNP/MIL‐101(Fe)‐NH 2 composite using NaBH 4 , for comparison (D) [41] …”

“…The optimal results achievable with these gold composites demonstrated an apparent synergistic effect: AuNPs play the role of the active phase where the catalytic phenomenon (substrate‐metal interaction) occurs, whereas the MOF assists in stabilizing and enhancing the catalytic and colloidal properties [40] . Further, Au@nanoMIL‐101(Fe)−NH 2 has been very recently used for the hydrogenation of 4‐nitrophenol, [41] showing a high conversion to 4‐aminophenol in only 20 seconds. This cubic MOF, with a highly rigid porosity (Brunauer‐Emmett‐Teller surface (S BET ) ~2300 m 2 .g −1 and pore sizes of ~3.0 & 3.4 nm, accessible via microporous windows 1.2 & 1.5 nm), is environmentally friendly and biosafe [42,43] .…”

Construction of Ternary Bismuth‐Based Heterojunction by Using (BiO)2CO3 as Electron Bridge for Highly Efficient Degradation of Phenol

“…[5] Among various phenol treatment technologies, semiconductor-based photocatalytic technology has been considered as an efficient strategy to eliminate environmental issues because it can efficiently degrade the organic pollutants in wastewater into H 2 O and CO 2 . [6][7][8] However, the development of robust, low cost and highly efficient visiblelight-driven photocatalysts directly utilized solar energy still confronts many challenges. [9] Amongst the various photocatalysts, Bi-based semiconductors have shown superior photocatalytic properties due to its low cost, suitable band gap, and unique layered structure.…”

“…To alleviate the increasingly serious environmental issues, efficient technologies have been developed for removing the organic pollutants [5] . Among various phenol treatment technologies, semiconductor‐based photocatalytic technology has been considered as an efficient strategy to eliminate environmental issues because it can efficiently degrade the organic pollutants in wastewater into H 2 O and CO 2 [6–8] . However, the development of robust, low cost and highly efficient visible‐light‐driven photocatalysts directly utilized solar energy still confronts many challenges [9] …”