Abstract
Boron-doped diamond (BDD) films were deposited onto either silicon or niobium cylindrical substrates with areas up to 35 cm2 for electrochemical applications. BDD electrodes were characterised in terms of their material and electrochemical properties by scanning electron microscopy, Raman spectroscopy and linear sweep voltammetry. These characterisation techniques indicated conductive polycrystalline BDD with low quantities of non-diamond carbon impurities. Electrochemical oxidations of pharmaceutical compounds were performed using these cylindrical electrodes and monitored by UV/Vis spectroscopy, chemical oxygen demand and total organic carbon. Mixtures of chlortetracycline, oxytetracycline and diclofenac were electrolyzed on a 9.42 cm2 (∅ = 6 mm, h = 50 mm) cylindrical Si/BDD anode using a current density of 8.2 mA cm−2. Ibuprofen was electrolyzed on an 18.0 cm2 (∅ = 10 mm, h = 60 mm) cylindrical Nb/BDD anode using a current density of 25 mA cm−2. Cylindrical-shape diamond electrodes present several advantages with respect to conventional plate-shape BDD electrodes such as handling, sealing and cell assembly. The obtained results show that BDD cylindrical anodes are promising for electrochemical wastewater treatment.
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Acknowledgments
The electron microscopy study was performed with the SEM-FEG (JEOL6330F) microscope of the LME/LNLS–Campinas. We are grateful to the Companhia Brasileira de Metalurgia e Mineração (CBMM) for the donation of the niobium used in this study. We also acknowledge the Brazilian agencies CAPES, FAPESP, FAPEMIG, FUNARBE and CNPq for financial support.
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Zanin, H., Teófilo, R.F., Peterlevitz, A.C. et al. Diamond cylindrical anodes for electrochemical treatment of persistent compounds in aqueous solution. J Appl Electrochem 43, 323–330 (2013). https://doi.org/10.1007/s10800-012-0491-4
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DOI: https://doi.org/10.1007/s10800-012-0491-4