Y-mediated optimization of 3DG-PbO2 anode for electrochemical degradation of PFOS
In our previous study, the three-dimensional graphene-modified PbO 2 (3DG-PbO 2 ) anode was prepared for the effective degradation of perfluorooctanesulfonat (PFOS) by the electrochemical oxidation process. However, the mineralization efficiency of PFOS at the 3DG-PbO 2 anode still needs to be furth...
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Published in | BMC chemistry Vol. 17; no. 1; p. 146 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
27.10.2023
BioMed Central Ltd Springer Nature B.V BMC |
Subjects | |
Online Access | Get full text |
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Summary: | In our previous study, the three-dimensional graphene-modified PbO
2
(3DG-PbO
2
) anode was prepared for the effective degradation of perfluorooctanesulfonat (PFOS) by the electrochemical oxidation process. However, the mineralization efficiency of PFOS at the 3DG-PbO
2
anode still needs to be further improved due to the recalcitrance of PFOS. Thus, in this study, the yttrium (Y) was doped into the 3DG-PbO
2
film to further improve the electrochemical activity of the PbO
2
anode. To optimize the doping amount of Y, three Y and 3DG codoped PbO
2
anodes were fabricated with different Y
3+
concentrations of 5, 15, and 30 mM in the electroplating solution, which were named Y/3DG-PbO
2
-5, Y/3DG-PbO
2
-15 and Y/3DG-PbO
2
-30, respectively. The results of morphological, structural, and electrochemical characterization revealed that doping Y into the 3DG-PbO
2
anode further refined the β-PbO
2
crystals, increased the oxygen evolution overpotential and active sites, and reduced the electron transfer resistance, resulting in a superior electrocatalytic activity. Among all the prepared anodes, the Y/3DG-PbO
2
-15 anode exhibited the best activity for electrochemical oxidation of PFOS. After 120 min of electrolysis, the TOC removal efficiency was 80.89% with Y/3DG-PbO
2
-15 anode, greatly higher than 69.13% with 3DG-PbO
2
anode. In addition, the effect of operating parameters on PFOS removal was analyzed by response surface, and the obtained optimum values of current density, initial PFOS concentration, pH, and Na
2
SO
4
concentration were 50 mA/cm
2
, 12.21 mg/L, 5.39, and 0.01 M, respectively. Under the optimal conditions, the PFOS removal efficiency reached up to 97.16% after 40 min of electrolysis. The results of the present study confirmed that the Y/3DG-PbO
2
was a promising anode for electrocatalytic oxidation of persistent organic pollutants. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2661-801X 2661-801X |
DOI: | 10.1186/s13065-023-01057-3 |