The Dependence of Oxidation Parameters and Dyes’ Molecular Structures on Microstructure of Boron-Doped Diamond in Electrochemical Oxidation Process of Dye Wastewater

Abstract

In this study, the microstructure of boron-doped diamond (BDD), such as grain size, grain boundaries, surface boron concentration, film thickness, ratio of sp(3)/sp(2) was manipulated by adjusting the deposition parameters of hot filament chemical vapor deposition. Furthermore, Reactive orange 1 simulated dye wastewater was treated to discuss the degradation relationship between the microstructure of BDD electrodes and oxidation parameters. BDD electrode showed the worst electrocatalytic performance toward simulated dye wastewater, but exhibited the highest sensitivity to degradation parameters. In addition, the degradation processes of 8 kinds of synthetic dyes with different molecular structures were compared and the degradation relationship between the microstructure of BDD and the molecular structure of dyes was investigated. The degradation of refractory dyes were much more dependent on the microstructure of BDD electrodes compared to easily degradable ones, indicating that the optimization of oxidation parameters and the electrode microstructure are more effective to the degradation of refractory organic pollutants.

Enhanced Visible-Light-Driven Photoelectrochemical Activity in Nitrogen-Doped TiO2/Boron-Doped Diamond Heterojunction Electrodes

“…A sharp peak at 1332 cm –1 is corresponding to the TO mode of crystalline diamond (Figure c) . The broad bands at 1222 cm –1 are assigned to the boron doping in the diamond and especially for the metallic heavy B-doped diamond, which has been considered to relate to the phonon density of states of diamond . For the sample prepared with a N 2 /Ar ratio of 40%, the scattering peaks at 146, 410, and 515 cm –1 are ascribed to the characteristic peaks of anatase TiO 2 , which correspond to the E g , B 1g , and A 1g + B 1g modes .…”

Review—Pencil Graphite Electrode: An Emerging Sensing Material

“…2A). [31][32][33][34][35][36] For redox behavior, the HB pencil revealed equal electron-transfer as that on other carbon based electrodes. Overall it may be concluded that PGE represents a cheap and disposable sensor for electrochemical measurements in comparison to other more expensive commercial carbon electrodes.…”

High-Temperature Oxidation of Heavy Boron-Doped Diamond Electrodes: Microstructural and Electrochemical Performance Modification

“…Furthermore, wastewater treatment with advanced oxidation processes at BDD usually strongly depends on the potentials and current densities. It has been shown that a larger current promotes stability for urea removal at high potentials [7], which could also induce the thermal issues and electrode surface defects [8]. Moreover, the relatively high thermal conductivity coefficient (~700 W/mK) of BDD allows for its use as a heat spreader, replacing the commonly used metal spreaders such as copper, copper/refractory, or copper laminate in high power RF/microwave devices resulting in higher isolation of the ground plane at below 1.5 GHz [9,10].…”