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BiPO4-coated carbon microtube electrodes: preparation and characterization of their properties and electrocatalytic degradation of methylene blue
Ist Teil von
Environmental science and pollution research international, 2023-03, Vol.30 (11), p.29190-29205
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2023
Quelle
SpringerLink
Beschreibungen/Notizen
Bismuth phosphate (BiPO
4
), a very attractive candidate for organics electrodegradation, harbors tremendous potential on removing contaminants from water. Here, four carbon microtube electrodes were prepared from corncob, each coated with BiPO
4
by a different method to study the electrodegradation of methylene blue (MB). A thorough insight into the composite features of four electrodes was characterized. Better reversibility and electrocatalytic activity of the fourth electrode (BCC4) prepared by digital signal generator was presented with a current density of 5.71 mA cm
−2
at a potential of 1.6 V vs Ag/AgCl. The electrochemical impedances and actual lifetime of BCC4 were 125 Ω and 833 h, respectively. The effectiveness of each kind of BiPO
4
/carbon electrode was preliminarily evaluated by analyzing the actual conversion rate of the MB concentration, which confirms MB electrodegradation by the BiPO
4
/carbon electrode was mainly dominated by the hydroxyl radical oxidation. The mass transfer rate was increased by carbon microtube; thereby, electrocatalysis of BiPO
4
/carbon electrode increased as revealed by an increase in the MB degradation rate. The rate constants
k
obtained for the degradation of MB by BiPO
4
/carbon electrode at 20 ℃ was 0.0046 mM
−1
s
−1
, which was 11 times than that of BiPO
4
. The diffusion layer was decreased by carbon microtube, resulting in MB electrodegradation rate increased. The BiPO
4
coated on the surface of the carbon microtube electrodes strengthened their electrocatalytic performance, which shed new light on effective selection of suitable carbon electrode for degradation of organics. Therefore, BiPO
4
/carbon electrode could be potentially applied in the electrodegradation of organic pollutants.
Graphical Abstract