The preparation of PbO2 coatings on reticulated vitreous carbon for the electro-oxidation of organic pollutants
The preparation of PbO2 coatings on reticulated vitreous carbon for the electro-oxidation of organic pollutants
The preparation of PbO2 coatings on reticulated vitreous carbon (RVC) has been carried out at constant current from electrolytic baths containing aqueous Pb(II) and methanesulfonic acid (MSA, CH3SO3H). The morphological and structural analysis of the RVC/PbO2 deposits carried out by scanning electron microscopy (SEM) and X-ray diffraction revealed that a thick (100 ?m), homogeneous, nanostructured ?-PbO2 film can be successfully formed. As a result, three-dimensional ?-PbO2 structures were obtained, being particularly interesting for their use as anodes in wastewater treatment. The high oxidation ability of these anodes has been verified by the electro-oxidation of Methyl Orange aqueous solutions. Quick decolourisation was achieved, with total colour removal in less than 60 min at 600 mA due to the production of large amounts of reactive OH radicals from the oxidation of water at high anodic potentials. The progressive mineralisation of the solutions was also ascertained from the total organic carbon (TOC) removal, which was much quicker at a higher applied current. All the coated RVC electrodes exhibited excellent long-term stability and remained unaltered after prolonged electrolyses. In addition, novel PbO2 composite coatings were prepared in the presence of hydrothermally synthesized titanate nanotubes (TiNT). The SEM images showed the presence of TiNT agglomerates along the PbO2 surface, which led to higher anodic current in the cyclic voltammetries carried out with Methyl Orange solutions. It is suggested that TiNT favour the adsorption of the organic molecules, facilitating the contact with the OH radicals and thus accelerating the electro-oxidation process. This was confirmed by the faster TOC removal compared to that yielded by the RVC/PbO2, being 45% instead of 24% at 120 min
electrochemical oxidation, electrodeposition, lead dioxide, methanesulfonic acid, reticulated vitreous carbon
5158-5165
Recio, F.J.
c1569d6a-c8ca-4987-8313-01ef4c6cf776
Herrasti Gonzalez, P.
4b72d0e4-f391-421a-ae54-a9ba3f5632fc
Sires, I.
874c7b61-df3e-4810-b922-9e4711fa55e5
Kulak, A.N.
e09573a7-40c5-45dc-a65d-2ffad6244fa7
Bavykin, D.V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Ponce de Leon, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
2011
Recio, F.J.
c1569d6a-c8ca-4987-8313-01ef4c6cf776
Herrasti Gonzalez, P.
4b72d0e4-f391-421a-ae54-a9ba3f5632fc
Sires, I.
874c7b61-df3e-4810-b922-9e4711fa55e5
Kulak, A.N.
e09573a7-40c5-45dc-a65d-2ffad6244fa7
Bavykin, D.V.
1e9fabfc-d078-4585-876f-85ff33b7eed5
Ponce de Leon, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Recio, F.J., Herrasti Gonzalez, P., Sires, I., Kulak, A.N., Bavykin, D.V., Ponce de Leon, C. and Walsh, F.C.
(2011)
The preparation of PbO2 coatings on reticulated vitreous carbon for the electro-oxidation of organic pollutants.
Electrochimica Acta, 56 (14), .
(doi:10.1016/j.electacta.2011.03.054).
Abstract
The preparation of PbO2 coatings on reticulated vitreous carbon (RVC) has been carried out at constant current from electrolytic baths containing aqueous Pb(II) and methanesulfonic acid (MSA, CH3SO3H). The morphological and structural analysis of the RVC/PbO2 deposits carried out by scanning electron microscopy (SEM) and X-ray diffraction revealed that a thick (100 ?m), homogeneous, nanostructured ?-PbO2 film can be successfully formed. As a result, three-dimensional ?-PbO2 structures were obtained, being particularly interesting for their use as anodes in wastewater treatment. The high oxidation ability of these anodes has been verified by the electro-oxidation of Methyl Orange aqueous solutions. Quick decolourisation was achieved, with total colour removal in less than 60 min at 600 mA due to the production of large amounts of reactive OH radicals from the oxidation of water at high anodic potentials. The progressive mineralisation of the solutions was also ascertained from the total organic carbon (TOC) removal, which was much quicker at a higher applied current. All the coated RVC electrodes exhibited excellent long-term stability and remained unaltered after prolonged electrolyses. In addition, novel PbO2 composite coatings were prepared in the presence of hydrothermally synthesized titanate nanotubes (TiNT). The SEM images showed the presence of TiNT agglomerates along the PbO2 surface, which led to higher anodic current in the cyclic voltammetries carried out with Methyl Orange solutions. It is suggested that TiNT favour the adsorption of the organic molecules, facilitating the contact with the OH radicals and thus accelerating the electro-oxidation process. This was confirmed by the faster TOC removal compared to that yielded by the RVC/PbO2, being 45% instead of 24% at 120 min
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Published date: 2011
Keywords:
electrochemical oxidation, electrodeposition, lead dioxide, methanesulfonic acid, reticulated vitreous carbon
Organisations:
Engineering Mats & Surface Engineerg Gp, Engineering Science Unit
Identifiers
Local EPrints ID: 184995
URI: http://eprints.soton.ac.uk/id/eprint/184995
ISSN: 0013-4686
PURE UUID: 45d4a16f-6b7f-4f95-a57b-bdf51fe46e48
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Date deposited: 09 May 2011 12:49
Last modified: 15 Mar 2024 03:22
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Contributors
Author:
F.J. Recio
Author:
P. Herrasti Gonzalez
Author:
I. Sires
Author:
A.N. Kulak
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