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Catalytic Effect of Hydrogen Peroxide in the Electrochemical Treatment of Phenolic Pollutants using a BDD Anode
Author(s) -
Barrera Héctor,
RoaMorales Gabriela,
BalderasHernández Patricia,
BarreraDíaz Carlos E.,
FrontanaUribe Bernardo A.
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900174
Subject(s) - hydrogen peroxide , chemistry , cyclic voltammetry , electrochemistry , degradation (telecommunications) , pollutant , anode , catalysis , nuclear chemistry , phenol , inorganic chemistry , electrode , organic chemistry , telecommunications , computer science
Phenolic pollutants are recalcitrant substances that cannot be removed from wastewater using the current treatments. In this study, degradation of phenolic pollutants was studied on the basis of the application of hydrogen peroxide during the electrooxidation process using BDD as anode (EO−H 2 O 2 coupled process). The process was optimized using 4‐chlorophenol (4‐CP) as model compound and later an emerging pollutant, Nonylphenol Ethoxylate‐10 (NP 10 EO), was degraded using the optimized experimental conditions found. To ascertain treatment effectiveness, experiments with hydrogen peroxide (H 2 O 2 ), electrooxidation (EO) and EO−H 2 O 2 (coupled process) were carried out. The variables considered in this investigation were pH, current density, quantity of H 2 O 2 , and reaction time. It was observed that the coupled process (EO−H 2 O 2 ) increases degradation efficiency, reaching 81.9 % for 4‐CP and 94.3 % for NP 10 EO. UV/VIS spectrophotometry, COD and HPLC analysis verified these results. The results of the analysis by cyclic voltammetry after the EO−H 2 O 2 coupled process indicate that pollutants in the solution were efficiently oxidized. It was concluded that small amounts of hydrogen peroxide (250 μL 30 % w/v solution per 1.1 L) are sufficient to attain good results; larger amounts of H 2 O 2 produce inhibitory effects during degradation. The slow cathode (SS) oxidation during the experiments was confirmed by XPS and AFM analysis.