Enhanced the synergistic degradation effect between active hydroxyl and reactive oxygen species for indoor formaldehyde based on platinum atoms modified MnOOH/MnO2 catalyst

Regulating the Pt–MnO2 Interaction and Interface for Room Temperature Formaldehyde Oxidation

“…The signals of 1356 and 1604 cm −1 originated from ν s(OCO) and ν as(OCO) of formate, while the δ CH and ν CH signals of the formate are observed at 2724, 2821, and 2945 cm −1 . 2,14 With temperature increases from 25 to 150 °C, both the DOM and formate species are progressively converted, forming CO 2 detected at 2348 cm −1 . Meantime, the signals of 1002, 1127, and 1286 cm −1 due to bidentate carbonate species are more and more often present at high temperatures.…”

“…The stabilization of single Pt atoms and generation of hydroxyl radicals on MnO 2 were ascribed to the excellent performance. 13 14 Dispersing Pt nanoparticles on MnO 2 is also an effective approach to weakening the Mn−O bond and generating oxygen vacancy by electronic metal−support interaction at the Pt−MnO 2 interface. 15 The metal−support interaction can be tuned by varying the size of the Pt nanoparticles and by changing the shape or phase of the MnO 2 supports, leading to different mobilities of the surface lattice oxygen and thus different amounts of oxygen vacancy.…”

“…Theoretical calculations confirmed the half formation energy of O 2 * from O 2 on Pt SA -MnOOH/MnO 2 compared to Pt–MnO 2 . The synergism between Pt SA and MnOOH produced active O 2 * and OH* for HCHO oxidation …”

Amino groups modified MnOx‐PUF applied in indoor air purification: removing formaldehyde at room temperature

“…The internal HCHO tester (PPM‐HTV, UK, the measuring range is 0–10 ppm, the test accuracy is 0.01 ppm) and CO 2 tester (INNOVA Air Tech Instruments, model 1412) would record the concentration of HCHO and CO 2 with time prolong. More detailed information on HCHO removal tests could be found in our previously published work [55] . In particular, the static HCHO removal efficiency and static HCHO‐to‐CO 2 conversion efficiency are calculated by the following formulas: $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm HCHO}\ {\rm static}\ {\rm removal}\ {\rm efficiency}\hfill\cr =\ {{{C}_{initial\ HCHO}-{C}_{final\ HCHO}}\over{{C}_{initial\ HCHO}}}\times 100\hskip0.17em{\rm \char37 }\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm HCHO}\hbox{-}{\rm to}\hbox{-}{\rm CO}{_{2}}\ {\rm conversion}\ {\rm efficiency}\hfill\cr =\ {{{C}_{final\ CO2}-{C}_{initial\ CO2}}\over{{C}_{initial\ HCHO}}}\times 100\hskip0.17em{\rm \char37 }\hfill\cr}}$$$ …”

“…More detailed information on HCHO removal tests could be found in our previously published work. [55] In particular, the static HCHO removal efficiency and static HCHOto-CO 2 conversion efficiency are calculated by the following formulas:…”