Cabanga ngezwe lapho imfucuza yezimboni ingancishiswa nje, kodwa iguqulelwe into ewusizo. Lolu hlobo lomnotho oyindilinga seluvele lusebenza kukhabhoni. Manje, abacwaningi bezobunjiniyela bamandla, imvelo & amakhemikhali e-Washington University e-St. Louis baye bahlakulela indlela ethembisayo yokuguqula i-nitrogen oxide eyingozi, ingxenye enkulu yemvula ye-asidi, ibe yi-nitric acid, esetshenziswa ekusetshenzisweni kwansuku zonke kusukela ekukhiqizeni umanyolo kuya ekusetshenzisweni kwensimbi.
UFeng Jiao, uLauren noLee Fixel, oProfesa Abavelele eMcKelvey School of Engineering eWashU, kanye nozakwabo bathuthukise indlela yokuguqula ukukhishwa kwe-nitrogen oxide (NO) kube yi-nitric acid ehlanzekile kakhulu (HNO₃) . Le nqubo entsha isebenza ezimweni eziseduze nezinengqalasizinda encane futhi inikeza ikhambi elisebenzayo kwezomnotho lemfucuza ye-nitrogen yezimboni, enikeza izinzuzo zomnotho nezemvelo.
"Senze indlela ye-electrochemical yokuguqula i-NO, igesi yemfucuza enobuthi, ibe yi-nitric acid ebalulekile," kusho uJiao. "Isisusa sethu esiyinhloko ukulwa AKUKHO ukukhishwa okuvela ezimayini, lapho inani elikhulu le-nitric acid lisetshenziselwa ukuhlakaza izinsimbi zensimbi, okuholela ekukhishweni okuphawulekayo. Ubuchwepheshe bethu buvumela ukuguqulwa kwesayithi kwe-NO ku-nitric acid ukuze iphinde isetshenziswe ngokushesha, okwenza inqubo eqhubekayo futhi eyindilinga."
Inqubo entsha ye-electrochemical isebenzisa i-catalyst engabizi kakhulu, esekelwe ku-carbon ye-NO oxidation. Ihlanganiswe ne-catalyst yokunciphisa i-oxygen yensimbi eyodwa eyenziwe nguGang Wu, uSolwazi Wezamandla, Ubunjiniyela Bezimoto Zemvelo Nezokulwa eMcKelvey Engineering, le nqubo isebenza ngokusetshenziswa kwamandla okuphansi futhi iguqula i-NO ibe yi-HNO₂ ngaphandle kwesidingo sezithasiselo zamakhemikhali noma izinyathelo ezengeziwe zokuhlanza.
Uhlelo lwe-electrochemical oxidation luklanywe ngokomgomo othi "plug and play", kusho uJiao, futhi lungasethwa esizeni ngaphandle kokutshalwa kwezimali okukhulu engqalasizinda noma izinto zokusetshenziswa ezibizayo njengezinsimbi eziyigugu. Iyavumelana nezimo futhi ivumelana nezimo ekusebenzeni okuncane noma okuphakathi futhi isebenza endaweni eseduze negumbi lokushisa, inciphisa kakhulu ukusetshenziswa kwamandla, izindleko, nomthelela wemvelo uma kuqhathaniswa nendlela yokucubungula ka-NO esetshenziswa kakhulu, edinga amazinga okushisa aphezulu okusebenza.
Uhlelo lufinyelela ukusebenza kahle okungaphezu kwamaphesenti angama-90 uma kusetshenziswa i-NO emsulwa. Ngisho noma amazinga e-NO aphansi, uhlelo lugcina ukusebenza kahle okungaphezu kwamaphesenti angama-70, okwenza lukwazi ukuzivumelanisa nezinhlobo eziningi zemfucuza yezimboni. Ukuhlanganiswa okuqondile kwe-HNO₃ egxilile, ehlanzekile kakhulu - kufika kumaphesenti angama-32 ngesisindo - kusuka ku-NO namanzi ngaphandle kwezithasiselo ze-electrolyte noma ukuhlanzwa okungezansi kuvula indlela ye-electrochemical yokuthuthukisa ukukhishwa kwe-NO futhi kukhuthaza ukulawulwa kokungcola okuqhubekayo kanye nokukhiqizwa kwamakhemikhali.
"I-nitric acid ekhiqizwa uhlelo lwethu ingasetshenziswa ngokuqondile ezimayini noma kwezinye izinqubo zamakhemikhali," kusho uJiao. "Sesivele sizuze ukusebenza kahle nokuhlanzeka okumangazayo ekukhiqizeni kwethu. Ngokuzayo, sizosebenzela ukuthuthukisa lezi zibalo ngenkathi sizikhulisa ukuze zisebenze."
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