Mwanjira yotakata, makutidwe ndi okosijeni a electrochemical amatanthawuza njira yonse ya electrochemistry, yomwe imaphatikizapo machitidwe achindunji kapena osalunjika a electrochemical omwe amapezeka pa elekitirodi kutengera mfundo zochepetsera oxidation. Izi zimafuna kuchepetsa kapena kuchotsa zowononga m'madzi oipa.
Mwapang'onopang'ono, electrochemical oxidation imatanthawuza njira ya anodic. Pochita izi, yankho la organic kapena kuyimitsidwa kumalowetsedwa mu cell electrolytic, ndipo kudzera mukugwiritsa ntchito mwachindunji, ma elekitironi amachotsedwa pa anode, zomwe zimatsogolera ku makutidwe ndi okosijeni azinthu zachilengedwe. Kapenanso, zitsulo zotsika kwambiri zimatha kukhala oxidized ku ayoni azitsulo apamwamba kwambiri pa anode, omwe amatenga nawo gawo mu makutidwe ndi okosijeni azinthu zachilengedwe. Nthawi zambiri, magulu ena ogwira ntchito mkati mwa organic compounds amawonetsa zochitika zama electrochemical. Pogwiritsa ntchito magetsi, mapangidwe a magulu ogwira ntchitowa amasintha, amasintha mankhwala a organic compounds, kuchepetsa kawopsedwe kawo, ndi kupititsa patsogolo biodegradability.
Electrochemical oxidation ikhoza kugawidwa m'magulu awiri: oxidation mwachindunji ndi oxidation osalunjika. Direct makutidwe ndi okosijeni (mwachindunji electrolysis) kumaphatikizapo kuchotsa mwachindunji zoipitsa m'madzi oipa ndi oxidizing pa electrode. Izi zikuphatikizapo anodic ndi cathodic njira. Njira ya anodic imaphatikizapo makutidwe ndi okosijeni a zoipitsa pamwamba pa anode, kuwasandutsa zinthu zochepa zapoizoni kapena zinthu zomwe zimatha kuwonongeka kwambiri ndi biodegradable, potero kuchepetsa kapena kuchotsa zowononga. Njira ya cathodic imaphatikizapo kuchepetsa zowononga pamtunda wa cathode ndipo imagwiritsidwa ntchito makamaka pofuna kuchepetsa ndi kuchotsa ma halogenated hydrocarbons ndi kubwezeretsanso zitsulo zolemera.
Njira ya cathodic imatha kutchedwanso kuchepetsa electrochemical. Zimaphatikizapo kusamutsa ma electron kuti achepetse ayoni azitsulo zolemera monga Cr6 + ndi Hg2 + m'madera awo otsika oxidation. Kuphatikiza apo, imatha kuchepetsa ma chlorinated organic compounds, kuwasandutsa zinthu zopanda poizoni kapena zopanda poizoni, ndikupangitsa kuti biodegradability:
R-Cl + H+ + e → RH + Cl-
Indirect oxidation (indirect electrolysis) imaphatikizapo kugwiritsa ntchito electrochemically generated oxidizing kapena reduction agents monga reactants kapena catalysts kusintha zoipitsa kukhala zinthu zochepa poizoni. Electrolysis yosalunjika imatha kugawidwa m'njira zosinthika komanso zosasinthika. Njira zosinthika (mediated electrochemical oxidation) zimaphatikizapo kukonzanso ndi kubwezeretsanso mitundu ya redox panthawi ya electrochemical process. Njira zosasinthika, komano, zimagwiritsa ntchito zinthu zopangidwa kuchokera kuzinthu zosasinthika za electrochemical, monga ma oxidizing amphamvu monga Cl2, klorate, hypochlorites, H2O2, ndi O3, kuti oxidize organic compounds. Njira zosasinthika zimathanso kupanga ma oxidative intermediate kwambiri, kuphatikiza ma elekitironi osungunuka, ·HO radicals, ·HO2 radicals (hydroperoxyl radicals), ndi ·O2- radicals (superoxide anions), omwe angagwiritsidwe ntchito kutsitsa ndikuchotsa zowononga monga cyanide, phenols, COD (Chemical Oxygen Demand), ndi S2- ions, potsirizira pake kuwasandutsa zinthu zopanda vuto.
Pankhani ya mwachindunji anodic makutidwe ndi okosijeni, otsika reactant ndende akhoza kuchepetsa electrochemical pamwamba zochita chifukwa misa kusamutsa malire, pamene malire kulibe kwa njira indirect makutidwe ndi okosijeni. Panjira zonse zachindunji komanso zosalunjika za okosijeni, zochitika zam'mbali zokhudzana ndi kutulutsa mpweya wa H2 kapena O2 zitha kuchitika, koma machitidwe am'mbali awa amatha kuwongoleredwa posankha zida zama elekitirodi komanso kuwongolera komwe kungachitike.
Electrochemical oxidation yapezeka kuti ndi yothandiza pochiza madzi otayidwa okhala ndi zinthu zambiri, zolemba zovuta, unyinji wa zinthu zotsutsana, komanso mitundu yayikulu. Pogwiritsa ntchito ma anode okhala ndi electrochemical zochita, ukadaulo uwu ukhoza kupanga bwino ma hydroxyl radicals. Izi zimabweretsa kuwonongeka kwa zinthu zowononga zomwe zimapitilirabe kukhala zinthu zopanda poizoni, zomwe zimatha kuwonongeka ndi mineralization kukhala zinthu monga carbon dioxide kapena carbonates.
Nthawi yotumiza: Sep-07-2023
