Puas yog titanium dioxide muaj kev nyab xeeb?
Hauv kev lag luam cov ntaub ntawv, titanium dioxide (TiO₂) yog siv dav hauv txheej txheej, yas, tshuaj pleev ib ce, ntim khoom noj, thiab ntau lwm yam lag luam vim nws cov khoom tshwj xeeb physicochemical. Txawm li cas los xij, nrog cov neeg siv khoom txhawj xeeb txog kev nyab xeeb ntawm cov khoom, cov lus nug ntawm "Puas yog titanium dioxide muaj kev nyab xeeb?" tau dhau los ua ib qho lus nug nquag hauv kev sib tham txog kev koom tes. Tsab ntawv xov xwm no yuav tshuaj xyuas kev nyab xeeb ntawm titanium dioxide los ntawm kev pom kev tshawb fawb, suav nrog cov xwm txheej siv tswv yim nrog cov ntaub ntawv tshawb fawb pom zoo los muab lub hom phiaj siv rau cov koom tes hauv kev lag luam.
Cov tshuaj stability ntawm titanium dioxide yog lub hauv paus ntawm nws txoj kev nyab xeeb. Raws li amphoteric oxide, titanium dioxide yog insoluble nyob rau hauv dej, dilute acids, thiab organic solvents nyob rau hauv chav tsev kub, dissolving tsuas maj mam nyob rau hauv siab - kub concentrated sulfuric acid los yog hydrofluoric acid. Qhov inertness no tso cai rau nws kom ruaj khov muaj kev cuam tshuam txog ultraviolet rays yam tsis muaj decomposing los tsim cov khoom tsis zoo thaum siv los ua tshuaj pleev thaiv hnub lub cev hauv cov tshuaj pleev ib ce. For example, in sunscreens, nano-sized titanium dioxide, after surface modification technology, can be uniformly dispersed in the emulsion to form a dense protective layer, preventing ultraviolet penetration and preventing particle agglomeration that clogs pores. Cov koom haum tso cai thoob ntiaj teb xws li European Committee rau Kev Ntsuam Xyuas Cov Khoom Siv Tshuaj Txhuam Hniav (SCCS) tau hais meej meej tias kev ua raws li cov ntsiab lus ntawm titanium dioxide ua rau tsis muaj carcinogenic lossis mutagenic txaus ntshai hauv kev sib cuag ntawm daim tawv nqaij. Nws Pawg 2B kev faib cov carcinogen tsuas yog siv rau cov chaw lag luam uas cuam tshuam nrog ntev - lub sij hawm nqus tau cov hmoov av ntau, thiab tsis cuam tshuam rau kev siv txhua hnub.
Hauv cov khoom noj thiab tshuaj, kev nyab xeeb ntawm titanium dioxide kuj tau raug kuaj xyuas nruj. Raws li cov khoom noj ntxiv (E171), titanium dioxide tau tso cai rau kev ua kom zoo nkauj thiab ci ntsa iab hauv cov khoom xws li cov khoom qab zib, chocolates, thiab cov tshuaj pleev xim. Txawm hais tias qee qhov kev tshawb fawb tau qhia tias nano- loj titanium dioxide tuaj yeem cuam tshuam qhov sib npaug ntawm plab microbiota, cov kev sim tom qab tau pom tias cov nyiaj ntxiv rau cov zaub mov zoo li qis dua qhov kev nyab xeeb, thiab tib neeg lub plab zom mov tsis tuaj yeem nqus nws cov khoom. Piv txwv li, European Food Safety Authority (EFSA), tom qab kev ntsuam xyuas rov qab rau xyoo 2021, tau lees paub tias zaub mov -qib titanium dioxide, thaum noj ntawm ib hnub kom tsis pub tshaj 1.5 mg / kg lub cev hnyav, tsis ua rau muaj kev hem thawj rau kev noj qab haus huv. Hauv kev lag luam kws kho mob, cov khoom siv photocatalytic ntawm titanium dioxide yog siv los tsim cov kab mob tua kab mob, uas ua rau kom tsis muaj menyuam los ntawm cov kab mob ntawm cov phab ntsa hauv cov phab ntsa uas tsis muaj tshuaj lom, ua rau lawv muaj kev nyab xeeb zoo rau cov tsev kho mob chav ua haujlwm thiab tshuaj tua kab mob.
Kev nyab xeeb ntawm titanium dioxide nyob rau hauv cov ntawv thov kev lag luam yog ze ze rau cov txheej txheem ntau lawm. Siv cov txheej txheem kev lag luam ua piv txwv, rutile titanium dioxide, vim nws cov qauv siv lead ua ruaj khov, yog siv dav hauv cov txheej txheem phab ntsa sab nrauv, thiab nws cov huab cua tsis kam ua kom cov txheej yuav tsis ploj mus txog 10 xyoo nyob rau hauv ultraviolet hluav taws xob. Anatase titanium dioxide, vim nws cov kev ua haujlwm photocatalytic muaj zog, yog siv rau tus kheej - ntxuav iav thiab cov ntaub ntawv lim cua, ua tiav ib puag ncig purification los ntawm decomposing organic pollutants. Hauv kev ua cov yas, titanium dioxide, ua cov khoom tseem ceeb ntawm cov masterbatches dawb, tsis yog tsuas yog txhim kho cov khoom dawb xwb tab sis kuj txhim kho UV tiv thaiv, txuas ntxiv lub neej ntawm cov khoom sab nraum zoov. Tag nrho cov ntawv thov no yuav tsum muaj kev tswj xyuas nruj kom ntseeg tau tias cov ntsiab lus ntawm cov hlau hnyav (xws li txhuas thiab arsenic) yog qis dua lub teb chaws tus qauv, zam kev tsis ncaj ncees rau ib puag ncig lossis kev noj qab haus huv ntawm tib neeg.
Nws yog tsim nyog sau cia tias kev nyab xeeb ntawm titanium dioxide tsis yog kiag li; nws cov kev pheej hmoo yog ze ze rau kev siv scenario thiab particle morphology. Piv txwv li, ntev - nqus tau pa ntawm nano tsis kho -titanium dioxide plua plav tuaj yeem ua rau mob ntsws. Yog li ntawd, nruj me ntsis ua raws li cov cai tiv thaiv plua plav yog tsim nyog nyob rau hauv kev tsim khoom, xws li hnav plua plav qhov ncauj qhov ntswg thiab tuav lub rhiav qhov cua. Rau cov tib neeg uas muaj cov tawv nqaij rhiab heev, titanium dioxide hauv cov tshuaj pleev ib ce tuaj yeem ua rau muaj kev tsis haum xeeb vim yog cov khoom siv hauv lub cev (xws li cov tshuaj tsw qab thiab cov tshuaj tua kab mob). Nws raug pom zoo kom xaiv cov additives - cov qauv pub dawb los yog ua ib qho kev xeem.
Los ntawm cov tshuaj pleev thaiv hnub rau kev ntim khoom noj, los ntawm cov txheej txheem vaj tsev mus rau cov khoom siv kho mob, kev nyab xeeb ntawm titanium dioxide tau raug pov thawj los ntawm lub sijhawm ntev -, ntau - teb, thiab ntau - cov ntawv thov scenario thoob ntiaj teb. Nws cov tshuaj inertness, tsis tshua muaj toxicity, thiab tswj cov kev pheej hmoo ua rau nws yog ib qho tseem ceeb indispensable khoom nyob rau hauv niaj hnub kev lag luam. Rau cov neeg koom tes, xaiv cov khoom siv titanium dioxide uas ua raws li cov qauv thoob ntiaj teb (xws li ISO thiab FDA) thiab ua raws li cov txheej txheem kev siv cov txheej txheem tuaj yeem ua tiav nws cov txiaj ntsig kev ua tau zoo thaum ua kom muaj kev nyab xeeb ntawm qhov kawg - siv daim ntawv thov. Hauv kev nrhiav cov thev naus laus zis tshiab thiab kev txhim kho ntsuab, titanium dioxide yuav txuas ntxiv ua lub luag haujlwm tseem ceeb ua "lub hauv paus ntawm kev nyab xeeb," pab ntau yam kev lag luam txav mus rau yav tom ntej zoo dua.
