Mupfungwa yakafara, electrochemical oxidation inoreva maitiro ese e electrochemistry, ayo anosanganisira zvakananga kana zvisina kunanga electrochemical maitiro anoitika pa electrode zvichibva pamisimboti yekuderedza oxidation-kuderedza maitiro. Aya maitiro ane chinangwa chekudzikisa kana kubvisa zvinosvibisa kubva mumvura ine tsvina.
Zvakanyatsotsanangurwa, electrochemical oxidation inoreva zvakananga kune anodic maitiro. Muchiitiko ichi, organic solution kana kumiswa inounzwa musero re electrolytic, uye kuburikidza nekushandiswa kweiyo yakananga ikozvino, maerekitironi anotorwa pane anode, zvichitungamira kune oxidation yeorganic compounds. Neimwe nzira, simbi yakaderera-valence inogona kuve yakashongedzwa kune yakakwira-valence simbi ions pane anode, iyo inozotora chikamu muiyo oxidation ye organic makomponi. Kazhinji, mamwe mapoka anoshanda mukati meorganic compounds anoratidza electrochemical chiitiko. Pasi pesimba remunda wemagetsi, chimiro chemapoka aya anoshanda chinochinja, kushandura chimiro chemakemikari ezve organic compounds, kuderedza huturu hwavo, uye kuwedzera biodegradability yavo.
Electrochemical oxidation inogona kuiswa mumhando mbiri: yakananga oxidation uye isina kunanga oxidation. Direct oxidation (yakananga electrolysis) inosanganisira kubviswa kwakananga kwezvinosvibisa kubva mumvura yakaraswa nekuita oxidizing pa electrode. Iyi nzira inosanganisira zvose anodic uye cathodic maitiro. Iyo anodic process inosanganisira oxidation yezvinosvibisa panzvimbo yeanode, ichichishandura kuita zvinhu zvishoma zvine muchetura kana zvinhu zvinonyanya kuparara, nekudaro kuderedza kana kubvisa zvinosvibisa. Iyo cathodic process inosanganisira kudzikiswa kwezvinosvibisa panzvimbo yecathode uye inonyanya kushandiswa kudzikisa nekubvisa halogenated hydrocarbons uye kudzoreredzwa kwesimbi inorema.
Iyo cathodic process inogona zvakare kunzi se electrochemical kuderedza. Zvinosanganisira kutamiswa kwemaerekitironi kuderedza heavy metal ions seCr6+ neHg2+ munzvimbo dzadzo dzepasi oxidation. Pamusoro pezvo, inogona kuderedza chlorinated organic compounds, ichivashandura kuita zvinhu zvisinganyanyi muchetura kana zvisina muchetura, zvichizosimudzira biodegradability yavo:
R-Cl + H+ + e → RH + Cl-
Indirect oxidation (indirect electrolysis) inosanganisira kushandiswa kweelectrochemically generated oxidizing kana reducing agents sezvinoita kana zvinokonzeresa kushandura zvinosvibisa kuita zvinhu zvine chepfu shoma. Indirect electrolysis inogona kuverengerwazve kuita inodzokororwa uye isingadzokerike maitiro. Reversible process (mediated electrochemical oxidation) inosanganisira kudzoreredza uye kudzokorodza kwemhando dze redox panguva ye electrochemical process. Maitiro asingadzoreki, kune rumwe rutivi, anoshandisa zvinhu zvinogadzirwa kubva kusingadzokerike electrochemical reactions, senge yakasimba oxidizing agents seCl2, chlorates, hypochlorites, H2O2, uye O3, kuti oxidize organic komisheni. Irreversible process inogonawo kugadzira maoxidative intermediate akanyanya, anosanganisira maelectrons akagadziriswa, ·HO radicals, ·HO2 radicals (hydroperoxyl radicals), uye ·O2- radicals (superoxide anions), inogona kushandiswa kuderedza nekubvisa zvinosvibisa secyanide, phenols, COD (Chemical Oxygen Demand), uye S2- ions, pakupedzisira achivashandura kuva zvinhu zvisingakuvadzi.
Kana iri yakananga anodic oxidation, yakaderera reactant concentrations inogona kudzikisira iyo electrochemical surface reaction nekuda kwekuremerwa kwekutamisa mizhinji, nepo ichi chinogumira chisipo kune zvisina kunanga oxidation maitiro. Munguva dzese dzakanangana uye dzisina kunanga oxidation maitiro, maitiro epadivi anosanganisira chizvarwa cheH2 kana O2 gasi anogona kuitika, asi aya maitiro epadivi anogona kudzorwa kuburikidza nekusarudzwa kwezvinhu zve electrode uye zvinogona kutonga.
Electrochemical oxidation yakawanikwa ichishanda mukurapa mvura yetsvina ine yakakwira organic concentrations, yakaoma kuumba, kuwanda kwezvinhu zvinoramba, uye yakakwirira coloration. Nekushandisa anode ane electrochemical chiitiko, iyi tekinoroji inogona kunyatso gadzira yakanyanya oxidative hydroxyl radicals. Kuita uku kunotungamira mukuwora kwezvinoramba zvichisvibisa organic kuita zvisiri-chepfu, biodegradable zvinhu uye yavo yakazara mineralization kuita makomisheni akaita secarbon dioxide kana carbonates.
Nguva yekutumira: Sep-07-2023
