Cov txheej txheem oxidation photochemical rau kev rhuav tshem cov pa phem suav nrog cov txheej txheem uas muaj ob qho tib si catalytic thiab tsis yog catalytic photochemical oxidation. Cov thawj feem ntau siv oxygen thiab hydrogen peroxide ua oxidants thiab vam khom ultraviolet (UV) lub teeb los pib qhov oxidation thiab decomposition ntawm cov pa phem. Qhov kawg, hu ua photocatalytic oxidation, feem ntau tuaj yeem raug cais ua homogeneous thiab heterogeneous catalysis.
Hauv kev puas tsuaj ntawm cov khoom siv photocatalytic heterogeneous, ib qho khoom siv semiconductor photosensitive raug coj mus rau hauv lub kaw lus uas muaj kuab paug, ua ke nrog qee qhov teeb ci ntsa iab. Qhov no ua rau muaj kev txhawb nqa ntawm "electron-hole" khub ntawm qhov chaw semiconductor photosensitive nyob rau hauv lub teeb raug. Cov pa oxygen yaj, cov dej molecules, thiab lwm yam khoom uas nqus rau ntawm semiconductor cuam tshuam nrog cov "electron-hole" khub no, khaws cia lub zog ntau dhau. Qhov no tso cai rau cov khoom semiconductor kom kov yeej cov teeb meem thermodynamic thiab ua haujlwm ua catalysts hauv ntau yam catalytic reactions, tsim cov radicals oxidative siab xws li •HO. Cov radicals no tom qab ntawd pab txhawb kev puas tsuaj ntawm cov pa phem los ntawm cov txheej txheem xws li hydroxyl ntxiv, hloov pauv, thiab hloov pauv electron.
Cov txheej txheem oxidation photochemical suav nrog photosensitized oxidation, photoexcited oxidation, thiab photocatalytic oxidation. Photochemical oxidation ua ke cov tshuaj oxidation thiab hluav taws xob los txhim kho qhov nrawm thiab oxidative muaj peev xwm ntawm cov tshuaj oxidation piv rau cov tshuaj oxidation lossis kev kho hluav taws xob. Lub teeb ultraviolet feem ntau yog siv ua qhov chaw hluav taws xob hauv photocatalytic oxidation.
Tsis tas li ntawd xwb, yuav tsum muaj cov tshuaj oxidants uas tau teem tseg ua ntej xws li hydrogen peroxide, ozone, lossis qee yam catalysts rau hauv dej. Txoj kev no zoo heev rau kev tshem tawm cov organic molecules me me, xws li cov xim, uas nyuaj rau lwj thiab muaj tshuaj lom. Cov tshuaj tiv thaiv photochemical oxidation tsim ntau cov radicals uas muaj zog heev hauv dej, uas yooj yim cuam tshuam cov qauv ntawm cov organic compounds.
Lub sijhawm tshaj tawm: Cuaj hlis-07-2023
