Mineral cathodic electro-precipitation and its kinetic modelling in thin-film microfluidic reactor during advanced electro-oxidation process
نویسندگان
چکیده
It is presented for the first time occurrence and modelling of cathodic mineral electro-precipitation in microfluidic thin-film configuration electrochemical advanced oxidation process (EAOP), order to better understand predict cathode's scaling when treating water containing Mg2+ Ca2+. Upon a systematic study, main results show that an inter-electrode distance 500 µm used at 4 mA cm−2, local alkalization on cathode surface occurs despite absence dissolved O2 suggesting it takes place due predominantly reduction (current efficiency > 99%) not reduction. Moreover, electromigration phenomenon could be neglected varying ionic strength from 0.02 0.1 mol L−1, while diffusion was kinetic rate-limiting step. In addition, Ca(OH)2 MgCO3 precipitates were formed under all investigated conditions. Mg(OH)2 found highly dependent current density, but independent other species jointly present electrolyte. precipitated once interfacial pH 10.2 reached. More CaCO3 electro-precipitated lower density (ca. 7.2%) owing more vigorous gas evolution higher applied. 12% less presence confirming its inhibiting effect towards scaling. The mathematical model proposed fit well experimental curves (Root mean square error (RMSE) < 0.1163) permit concentration depositing (i.e. Mg2+, Ca2+ CO32−). Furthermore, role hydroxyl radicals (•OH) produced boron-doped diamond (BDD) anode upon applied conditions, meaning outcome this study reliable across types and/or CO32− compliance their ubiquity treated by electrolysis general.
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ژورنال
عنوان ژورنال: Electrochimica Acta
سال: 2021
ISSN: ['1873-3859', '0013-4686']
DOI: https://doi.org/10.1016/j.electacta.2021.138487