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Detailed Program
Paper Number : TF-O04
Time Frame : 17:19~17:31
Presentation Date : Friday, 28, November
Session Name : Thin Films & Layers
Session Chair 1# : Soon-Gil Yoon
Session Chair 2# : Hiroshi Funakubo
Effect of Surface Modification of Boron-doped Diamond Electrode on Electrochemical Degradation of Organic Dyes in Wastewater
Choong-hyun LEE
Korea University
Keywords: Diamond electrode, Electrochemistry, Water treatment, Advanced oxidation process

Electrochemical advanced oxidation processes (EAOPs) are being examined by many researchers as a powerful methodology for decontaminating organic dyes in wastewater1. Boron-doped diamond (BDD) is a popular material used for the anode in the EAOPs owing to its wide potential window, high durability2. However, it still has some difficulties applying to industrial scale water treatment because of low efficiency considering its cost3. In order to improve efficiency of water treatment, we prepared modified BDD electrodes having wide surface area and investigated the water treatment efficiency using those electrodes. Modifications were performed in two ways; Pyramid structured electrode and porous electrode were fabricated using alkaline chemical etching and CO2 activation at high temperature, respectively. Both of BDD electrodes were fabricated by using electrostatic self-assembly (ESA) nano-diamond seeding method and hot filament chemical vapor deposition (HFCVD). The effective surface area of the pyramid structured BDD electrode increased more than twice than that of the non-modified electrode. The increase in the effective surface area affected directly to the improvement of the current efficiency for the dye wastewater treatment (Fig.1). In the case of porous BDD, the surface features of the electrodes were different according to activation temperatures. At the 1000 oC, more nano-sized pores were formed and effective surface area was slightly larger than that of the electrode etched at 900 oC. Also, there were some changes in Raman peaks showing some peaks intensified while some diminished. The result for the water treatment using the porous BDD electrode was also better than that of the non-modified electrode. Unlike the pyramid structured electrode, however, the change in film characteristic also affected the current efficiency for the oxidation process as well as the increase in effective surface area. These results indicate that modification of BDD electrodes can improve the efficiency of the electrochemical oxidation process.

References:

[1] Martínez-Huitle, C. A. and Brillas, E. Applied Catalysis B: Environmental 87, 105–145 (2009).
[2] Tröster, I. et al. Diamond and Related Materials 11, 640–645 (2002).
[3] Luo, D., Wu, L. and Zhi, J. ACS Nano 3, 2121–2128 (2009).
Acknowledgements :