Iindlela zokunyibilikisa i-photochemical zokunciphisa ukungcola ziquka iinkqubo ezibandakanya zombini i-catalytic kunye ne-non-catalytic photochemical oxidation. Le yokuqala idla ngokusebenzisa i-oxygen kunye ne-hydrogen peroxide njenge-oxidants kwaye ixhomekeke kukukhanya kwe-ultraviolet (UV) ukuqala i-oxidation kunye nokubola kokungcola. Le yokugqibela, eyaziwa ngokuba yi-photocatalytic oxidation, ngokubanzi inokwahlulwahlulwa njenge-homogeneous kunye ne-heterogeneous catalysis.
Kwi-photocatalytic degradation eyahlukeneyo, inani elithile lezinto ze-semiconductor ezibuthathaka kwi-photosensitive lifakwa kwinkqubo engcolileyo, idityaniswe nenani elithile lemitha yokukhanya. Oku kubangela ukuvuseleleka kwee-“electron-hole” pairs kumphezulu we-semiconductor obuthathaka kwi-photosensitive phantsi kokukhanya. Ioksijini enyibilikisiweyo, iimolekyuli zamanzi, kunye nezinye izinto ezifakwe kwi-semiconductor zidibana nezi pairs “ze-electron-hole”, zigcina amandla agqithisileyo. Oku kuvumela ii-semiconductor particles ukuba zoyise imiqobo yempendulo ye-thermodynamic kwaye zisebenze njengee-catalysts kwiimpendulo ezahlukeneyo ze-catalytic, zivelisa ii-radicals ze-oxidative eziphezulu ezifana ne-•HO. Ezi radicals emva koko ziququzelela ukuwohloka kokungcola ngeenkqubo ezifana nokongeza i-hydroxyl, ukutshintshwa, kunye nokudluliselwa kwe-electron.
Iindlela zokunyibilikisa i-photochemical ziquka ukunyibilikisa i-photosensitized, ukunyibilikisa i-photoexcited, kunye nokunyibilikisa i-photocatalytic. Ukunyibilikisa i-photochemical kudibanisa ukunyibilikisa i-chemical kunye ne-radiation ukuphucula isantya kunye namandla okunyibilikisa i-oxidation eempendulo ze-oxidation xa kuthelekiswa nokunyibilikisa i-chemical okanye unyango lwe-radiation. Ukukhanya kwe-ultraviolet kudla ngokusetyenziswa njengomthombo we-radiation kwi-photocatalytic oxidation.
Ukongeza, kufuneka kufakwe isixa esithile se-oxidants ezifana ne-hydrogen peroxide, i-ozone, okanye ii-catalysts ezithile emanzini. Le ndlela iyasebenza kakhulu ekususeni iimolekyuli ezincinci ze-organic, ezifana needayi, ezinzima ukuzonakalisa kwaye zibe netyhefu. Iimpendulo ze-photochemical oxidation zivelisa ii-radicals ezininzi ezisabela kakhulu emanzini, eziphazamisa ngokulula ulwakhiwo lweekhompawundi ze-organic.
Ixesha lokuthumela: Sep-07-2023
