Abstract
In this study, boron-doped diamond (BDD) film was deposited by hot-filament chemical vapor deposition (HFCVD) using acetone as the carbon source and trimethyl borate (TMB) as the boron source with the aim of lowering the manufacturing cost of BDD electrodes. The BDD film was deposited for 12 and 60 h to observe changes in the morphological behavior of the film as well as subsequent changes in the electrochemical properties. The morphology of the BDD film was not affected by the deposition time, but the thickness increased with increasing deposition time. As the deposition time increased, the deposition rate of the BDD film did not increase or decrease; rather, it remained constant at 100 nm/h. As the thickness of the BDD film increased, an increase in the potential window was observed. On the other hand, no distinct change was observed in the electrochemical activation and catalytic activity depending on the thickness, and there were not many differences. Chemical oxygen demand (COD) was measured to determine the practical applicability of the deposited BDD film. Unlike the potential window, the COD removal rate was almost the same and was not affected by the increase in the thickness of the BDD film. Both films under the two deposition conditions showed a high removal rate of 90% on average. This study confirms that BDD electrodes are much more useful for water treatment than the existing electrodes.
Highlights
Due to industrial development, large quantities of various organic compounds and recurrent wastewater are being discharged into bodies of water, negatively impacting the environment
The morphology and thickness of the boron-doped diamond (BDD) film with respect to the deposition time are shown in films deposited for (a) 12 h and (b) 60 h
For the 60 h BDD film deposition (Figure 3b), the (111) and (220) peaks were observed around 44◦ and 75◦, respectively
Summary
Large quantities of various organic compounds and recurrent wastewater are being discharged into bodies of water, negatively impacting the environment. Various methods have been developed for wastewater treatment, including biodegradation, chemical decomposition, electrochemical oxidation, and other physicochemical methods [1,2,3]. Electrochemical wastewater treatment methods are widely used due to their cost and efficiency advantages. Compared to physical and biological treatment methods, electrochemical methods are environmentally friendly because of the low treatment cost and the fact that there is no residue after treatment. High wastewater treatment is possible without the addition of toxic oxidants [4,5,6]. Electrochemical wastewater treatment is superior to other methods because it is possible to effectively oxidize and decompose contaminants using insoluble electrodes that produce
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