Formamide: Machadka Cilmi-baadhistu wuxuu soo jeedinayaa sawir-qaabaynta qashinka PET Plastic si loo soo saaro Formamide

Polyethylene terephthalate (PET), oo ah polyester-ka heerkulbeegga muhiimka ah, waxay leedahay wax soo saar caalami ah oo sannadle ah oo ka badan 70 milyan oo tan waxaana si weyn loogu isticmaalaa baakadaha cuntada maalinlaha ah, dunta, iyo meelaha kale. Si kastaba ha ahaatee, ka dambeeya mugga wax-soo-saarka baaxadda leh, ku dhawaad ​​80% qashinka PET ayaa si aan kala sooc lahayn loo tuuraa ama loo buuxiyaa, taasoo keenaysa wasakh deegaan oo daran oo horseedaysa qashinka kheyraadka kaarboonka ee la taaban karo. Sida loo gaaro dib u warshadaynta qashinka PET waxay noqotay caqabad adag oo u baahan horumar waara oo caalami ah.

Tignoolajiyada dib-u-warshadaynta ee hadda jirta, tignoolajiyada sawir-qaabaynta ayaa soo jiidatay fiiro gaar ah sababtoo ah sifooyinkeeda cagaaran iyo kuwa khafiifka ah. Farsamadani waxay u isticmaashaa tamarta cadceedda oo nadiif ah, oo aan wasakhayn sida xooga wadista, abuurta noocyada redox firfircoon ee goobta ku jira heerkulka jawiga iyo cadaadiska si ay u fududayso beddelka iyo cusboonaysiinta qiimaha lagu daray balaastikada qashinka. Si kastaba ha ahaatee, alaabooyinka hababka sawir-qaadaha ee hadda jira waxay inta badan ku xaddidan yihiin xeryahooda fudud ee oksijiinta ku jira sida formic acid iyo glycolic acid.

Dhawaan, koox cilmi baaris ah oo ka socota Xarunta Isku-beddelka Sawirka iyo Isku-dhafka ee machad ku yaal Shiinaha ayaa soo jeediyay isticmaalka qashinka PET iyo ammonia sida ilaha kaarboon iyo nitrogen, siday u kala horreeyaan, si ay u soo saaraan foramide iyada oo loo marayo falcelinta isku-xirnaanta CN ee photocatalytic. Si taas loo gaaro, cilmi-baarayaashu waxay naqshadeeyeen Pt1Au/TiO2 sawir-qaade. Xakamayntan, goobaha hal-atom-ka ah ee Pt waxay si xushmad leh u qabtaan elektaroonnada sawir-qaadista, halka Au nanoparticles ay qabtaan godadka sawir-qaadista, taas oo si weyn u wanaajinaysa kala-soocidda iyo wareejinta waxtarka sawir-qaadista lammaane-dalool elektaroonik ah, si kor loogu qaado dhaqdhaqaaqa sawir-qaadista. Heerka wax soo saarka foramide wuxuu gaaray ku dhawaad ​​7.1 mmol gcat⁻¹ h⁻¹. Tijaabooyin ay ka mid yihiin goobta-infrared spectroscopy iyo resonance elektarooniga paramagnetic ayaa shaaca ka qaaday dariiq falcelin-dhexdhexaad ah: godadka sawir-qaadista ee isku mar ah waxay oxidize ethylene glycol iyo ammonia, abuurista dhexdhexaadiyeyaasha aldehyde iyo radicals amino (· NH₂), kaas oo mara CN isku dhafka si ugu dambeyntii loo sameeyo. Shaqadani ma aha oo kaliya horudhac waddo cusub oo loogu talagalay beddelka qiimaha sare leh ee balaastikada qashinka ah, kobcinta xajmiga alaabada hagaajinta PET, laakiin sidoo kale waxay bixisaa istaraatiijiyad cagaaran, dhaqaale badan, iyo rajo leh oo loogu talagalay soo saarista xeryahooda muhiimka ah ee nitrogen-ku jira sida daawooyinka iyo sunta cayayaanka.

Natiijooyinka cilmi-baarista ee la xidhiidha ayaa lagu daabacay Angewandte Chemie International Edition oo hoos timaada cinwaanka "Photocatalytic Formamide Synthesis ee qashinka caaga ah iyo ammonia iyada oo loo sii marayo CN Bond Construction Under Conditions Under Conditions". Cilmi-baadhistu waxay maalgelin ka heshay mashaariicda ay taageerto Hay'adda Sayniska Dabiiciga ah ee Qaranka ee Shiinaha, Sanduuqa Wadajirka ah ee Shaybaarka ee Qalabka Novel ee u dhexeeya Akadeemiyada Sayniska ee Shiinaha iyo Jaamacadda Hong Kong, iyo ilo kale.