Highly Efficient Utilization of Nano-Fe(0) Embedded in Mesoporous Carbon for Activation of Peroxydisulfate

Abstract

Nanoscale zerovalent iron (nZVI) particles have received much attention in environmental science and technology due to their unique electronic and chemical properties. However, the aggregation and oxidation of nZVI brings much difficulty in practical application of environmental remediation. In this study, we reported a composite nano-Fe(0)/mesoporous carbon by a chelation-assisted coassembly and carbothermal reduction strategy. Nano-Fe(0) particles with surface iron oxide (Fe 2 O 3 •FeO) were wrapped with graphitic layers which were uniformly dispersed in mesoporous carbon frameworks. The unique structure made the nano-Fe(0) particles stable in air for more than 20 days. It was used as a peroxydisulfate (PDS) activator for the oxidation treatment of 2,4,6-trichlorophenol (TCP). The TOF value of MCFe for TCP degradation is nearly 3 times higher than those of FeSO 4 and Fe 2 O 3 •FeO and nearly 2 times than that of commercial nZVI. The reactive oxygen species (ROS) including •SO 4 − , HO•, and •O 2 − , 1 O 2 are efficiently generated by PDS activation with MCFe. The PDS activation process by nano-Fe(0) particles was intrinsically induced by the ferrous ions (Fe(II)) continuously generated at the solid/aqueous interface. Namely, the nano-Fe(0) particles were highly efficiently utilized in sulfate radical-based advanced oxidation processes (SR-AOP). The porous structure also assists the absorption and transfer of TCP during the degradation process.

Magnetic MIL(Fe)-type MOF-derived N-doped nano-ZVI@C rods as heterogeneous catalyst for the electro-Fenton degradation of gemfibrozil in a complex aqueous matrix

“…1b shows the diffractograms of the nano-ZVI@C and nano-ZVI@C-N catalysts obtained upon calcination of the corresponding MOFs at 800 ºC. The peaks at ~45º, ~65º and ~82º can be attributed to (110), ( 200) and ( 211 [45] or Fe3O4 [62] upon carbothermal reduction has also been reported considering other reactants.…”

“…S10 reveal that the relationship between their performance and the nature -21-and abundance of the iron-based structures present in the rods, especially with nano-ZVI, was quite straightforward. The presence of the latter particles, which are essential to ensure the Fe(III) reduction [45,68], was clearly greater when the pyrolysis temperature was increased from 650 to 800 ºC, as deduced from the higher intensity of the peaks, in particular that at ~45º.…”

“…The obtention of nanosized MOFs is interesting, aiming to increase the catalytic performance, but it complicates the post-treatment recovery. Hence, calcination may have an additional role as a method to produce magnetic materials [40][41][42][43][44][45]. Worth considering, nitrogen can be incorporated as…”

Highly Dispersed CoO Embedded on Graphitized Ordered Mesoporous Carbon as an Effective Catalyst for Selective Fischer–Tropsch Synthesis of C5+ Hydrocarbons

“… Tavasoli et al (2008 ) reported that Co/CNT catalysts prepared from the impregnation method exhibited much larger activity than Co/Al 2 O 3 on hydrocarbon yield, which can be ascribed to the weak interaction between Co species and CNT. In addition, mesoporous carbon (MC) using mesoporous silica as a precursor has also received much attention on FTS owing to its ordered pore structure and large surface area ( Wu et al, 2019 ). Zhao et al (2020 ) prepared Co/MC-1300 (where MC was prepared from pyrolysis of furfuryl alcohol and SBA-16 as the hard template), which showed improved cobalt reducibility and C 5+ selectivity up to 74%.…”

Ultrasonic role to activate persulfate/chlorite with foamed zero-valent-iron: Sonochemical applications and induced mechanisms

“…At present, the zero-valent-iron (ZVI, Fe 0 )-based materials in disperse mediums by modified techniques (pre-magnetized [12] , sulfidated [13] , loaded/embedded [14] , micro/nano [15] ) or in stationary phase ZVI (e.g. foamed-ZVI (Fe 0 f ) consisting of three-dimensional porous form ( Fig.…”