Xim dej khib nyiab yog ib qho kev sib tw loj hauv kev kho cov dej khib nyiab. Muaj ob qhov chaw ntawm cov xim dej khib nyiab: ib qho yog cov tshuaj tsuag xim dej khib nyiab tsim los ntawm cov rooj tog zaum, tsheb thiab lwm cov tuam txhab tsim khoom tom qab cov xim pleev xim rhiav yog saturated nrog dej adsorption, thiab lwm yam yog cov dej khib nyiab ntawm cov chaw tsim khoom xim. Cov xim muaj cov tshuaj lom uas yog soluble hauv dej. Thaum muaj kuab paug, nws tuaj yeem ua rau muaj kev puas tsuaj loj rau thaj chaw ecological thiab ua rau muaj kev hem thawj rau tib neeg lub neej. Yog li ntawd, kev kho mob ntawm cov xim muaj hlau khib nyiab yog ceev heev.
Vim muaj cov cationic charger high-density pawg tshwj xeeb rau cov xim dej kho decolorizing cov neeg ua haujlwm, lawv tuaj yeem ua ke nrog cov anionic pawg ntawm chromogenic tshuaj nyob rau hauv cov dej khib nyiab los tsim hydrophobic thiab insoluble ntsev uas tuaj yeem sib cais los ntawm dej. Tsis tas li ntawd, ntau pawg neeg nquag ntawm cov saw hlau molecular ntawm cov xim dej kho decolorizing cov neeg ua haujlwm tuaj yeem hnov mob nrog anionic pawg xws li sulfonic thiab carboxylic pawg hauv dye molecules los tsim cov tshuaj insoluble uas tuaj yeem tshem tawm ntawm dej, yog li tshem tawm cov xim ntawm dej,
Siv cov dej pleev xim los kho cov tshuaj decolorizing kom txo tau cov pa phem ib puag ncig thiab ua tiav cov dej pov tseg raug cai.