scholarly journals Anodic and cathodic pre-treatment effects on BDD surface to deposit copper nanoparticles applied to nitrate reduction

2012 ◽  
Vol 1395 ◽  
Author(s):  
L. C. D. Santos ◽  
A. B. Couto ◽  
J. T. Matsushima ◽  
M.C. Forti ◽  
M. R. Baldan ◽  
...  
Keyword(s):  
Nitrate Reduction ◽  
Particle Density ◽  
Reduction Process ◽  
Modified Electrodes ◽  
Boron Doped Diamond ◽  
Electrodeposition Process ◽  
Bdd Electrode ◽  
Boron Doped ◽  
Pre Treatment ◽  
Oxygen Surface

ABSTRACTThe influence of anodic and cathodic pre-treatment on boron doped diamond (BDD) surface for copper (Cu) electrodeposition was studied to assess Cu particle consolidation on BDD electrode. These modified electrodes were applied to study the nitrate electrochemical reduction process. The obtained results showed that the BDD surface cathodically treated presented high Cu particle density as well as even distribution on the electrode surface after the electrodeposition process. For samples anodically treated the electrodeposited Cu was dispersed with lower particle density. This behavior was attributed to a high electrode conductivity imposed by the cathodic pre-treatment leading to an increase in the BDD surface hydrogenation. Therefore, one can conclude that for electrochemical nitrate reduction the anodically treated BDD has a better reproducibility. This response is attributed to the Cu particle consolidation on BDD electrode due to the oxygen surface terminations induced by the anodic pretreatment.

scholarly journals Study of nitrate contaminants removal from groundwater on copper modified BDD electrode

2020 ◽  
Vol 194 ◽  
pp. 04024
Author(s):  
Peijing Kuang ◽  
Yubo Cui ◽  
Chuanping Feng ◽  
Yasuaki Einaga
Keyword(s):  
Nitrate Reduction ◽  
Nitrate Removal ◽  
Reduction Process ◽  
Copper Oxides ◽  
Boron Doped Diamond ◽  
Positive Potential ◽  
Bdd Electrode ◽  
Boron Doped ◽  
Reduction Efficiency ◽  
Enhanced Conductivity

The electrochemical nitrate reduction by using boron-doped diamond (BDD) and copper modified boron-doped diamond (Cu-BDD) electrodes was investigated at various potentials. Nitrate reduction efficiency and the products distribution was strongly dependent on the applied potential for both electrodes. The highest nitrate reduction efficiency of 77% was obtained at −2.0 V (vs. Ag/AgCl) by using Cu-BDD. Compared with BDD electrode, nitrate reduction on Cu-BDD electrode occurred at more positive potential. Copper oxides formed on BDD surface efficiently promoted enhanced conductivity of electrode to promote electrons transfer during nitrate reduction process. Meanwhile, the catalytic ability of copper was also conductive to the nitrate transformation. Therefore, the developed Cu-BDD would be a promising approach for efficient nitrate removal from groundwater.

Annealing enhancement in stability and performance of copper modified boron-doped diamond (Cu-BDD) electrode for electrochemical nitrate reduction

2021 ◽  
Vol 114 ◽  
pp. 108310
Author(s):  
Peijing Kuang ◽  
Keisuke Natsui ◽  
Yasuaki Einaga ◽  
Chuanping Feng ◽  
Yubo Cui ◽  
...  
Keyword(s):  
Nitrate Reduction ◽  
Boron Doped Diamond ◽  
Bdd Electrode ◽  
Boron Doped ◽  
And Performance

scholarly journals Efficiency of an integrated process of electrooxidation and anaerobic digestion of waste activated sludge

2020 ◽  
Author(s):  
José Antonio Barrios ◽  
Anaid Cano ◽  
Fernando F. Rivera ◽  
Margarita E. Cisneros ◽  
Ulises Durán
Keyword(s):  
Anaerobic Digestion ◽  
Cell Walls ◽  
Energy Analysis ◽  
Mathematical Optimization ◽  
Waste Activated Sludge ◽  
Boron Doped Diamond ◽  
Bdd Electrode ◽  
Boron Doped ◽  
Vs Removal ◽  
Pre Treatment

Abstract Background Most of the organic content of waste activated sludge (WAS) comprises microbial cells hard to degrade, which must be pre-treated for the energy recovery by anaerobic digestion (AD). Electrooxidation pre-treatment (EOP) with a boron-doped diamond (BDD) electrode have been considered a promising novel technology that increase hydrolysis rate, by the disintegrating cell walls from WAS. Although electrochemical oxidation could efficiently solubilise organic substances of macromolecules, limited reports are available on EOP of WAS for improving AD. In this endeavour, the mathematical optimization study and the energy analysis of the effect of current density (CD) during EOP and the initial total solids concentration [TS] from WAS on methane (CH4) production by AD was investigated. Results In the present work, biogas production from WAS conversion are comprehensively affected by CD and [TS]. The highest COD and VS removal by 60 and 39% respectively, were achieved with WAS at 3% of [TS] pre-treated at CD of 24.1 mA/cm2, and with a maximum CH4 production of 305 N-L/kg VS and a positive energy balance of 0.83 kWh/kg VS. Therefore, the low current densities used in boron-doped diamond (BDD) electrode are adequate to produce the strong oxidant ●OH radical on the electrode surface, allow the oxidation of organic compounds that favours the solubilization of COD from WAS. Conclusions The improvement of VS removal indicates that EOP help to disintegrating cell walls from WAS. This allows a decomposition reaction that leads to biodegrade more compounds during AD. The energy balance was positive, suggesting that even without any optimization the energy used as electricity could be approximately recovered as energy from the increased methane production. However, this kind of analysis have not been sufficiently studied so far, therefore, is important to understand how critical parameters can influence the pre-treatment and AD performances. The current study highlights that the mathematical optimization and energy analysis can get the whole process more convenient and feasible.

DICLOFENAC REMOVAL FROM AQUEOUS SOLUTIONS BY ELECTROOXIDATION AT BORON-DOPED DIAMOND (BDD) ELECTRODE

2015 ◽  
Vol 14 (6) ◽  
pp. 1339-1345
Author(s):  
Monica Ihos ◽  
Florica Manea ◽  
Maria Jitaru ◽  
Corneliu Bogatu ◽  
Rodica Pode
Keyword(s):  
Aqueous Solutions ◽  
Boron Doped Diamond ◽  
Bdd Electrode ◽  
Boron Doped

scholarly journals Study of the Electrochemical Deposition of Cu/Sn Alloy Nanoparticles on Boron Doped Diamond Films for Electrocatalytic Nitrate Reduction

2013 ◽  
Vol 1511 ◽  
Author(s):  
Jorge T. Matsushima ◽  
Andrea B. Couto ◽  
Neidenei G. Ferreira ◽  
Mauricio R. Baldan
Keyword(s):  
Electrochemical Deposition ◽  
Sem Analysis ◽  
Homogeneous Distribution ◽  
Alloy Nanoparticles ◽  
Electrocatalytic Reduction ◽  
Boron Doped Diamond ◽  
Buffer Solution ◽  
Bdd Electrode ◽  
Boron Doped ◽  
Dissolution Peak

ABSTRACTThis paper presents the study of the electrochemical deposition of Cu/Sn alloy nanoparticles on Boron Doped Diamond (BDD) films in order to improve their electrocatalytic activity and selectivity for application in nitrate electrochemical reduction. Cyclic voltammetry measurements evidenced the formation of Cu/Sn alloy electrodeposited on BDD electrode. The electrodeposited Cu/Sn can be better visualized by analyzing the dissolution process. By studying the dissolution peak separately, the dissolution peak of the Sn was obtained at a more positive potential, when compared with the dissolution peak of Cu. From the scanning electronic microscopy (SEM) analysis, the homogeneous distribution of the Cu/Sn alloys particles on BDD surface with grain size in nanometric scale was verified. From X-ray diffraction analysis, two Cu/Sn alloy phases (Cu41Sn11 and Cu10Sn3) were identified for the electrodeposits obtained at -0.5V and charge of 0.26 C. The electrocatalytic reduction of nitrate in 0.1 M Britton-Robinson (BR) buffer solution with pH 9 was analyzed. The BDD electrode modified with Cu/Sn alloy nanoparticles proved to potentiate the electrocatalytic reduction of nitrate.

Lithium monolayers on single crystal C(100) oxygen-terminated diamond

2011 ◽  
Vol 1282 ◽  
Author(s):  
Tomas L. Martin ◽  
Kane M. O’Donnell ◽  
Hidetsugu Shiozawa ◽  
Cristina E. Giusca ◽  
Neil A. Fox ◽  
...  
Keyword(s):  
Surface Layer ◽  
Single Crystal ◽  
Theoretical Modeling ◽  
Photoemission Spectroscopy ◽  
Boron Doped Diamond ◽  
X Ray ◽  
Boron Doped ◽  
Oxygen Surface

ABSTRACTThin lithium layers on oxygenated C(100) boron-doped diamond have been observed using x-ray photoemission spectroscopy. Conductive boron-doped diamond was oxygen-terminated using an ozone cleaner. Lithium was evaporated onto the oxygen-terminated C(100) surface and an as-grown hydrogen terminated surface to a thickness of approximately 50 nm. After washing with deionised water, significant lithium signal is still detected on oxygenated diamond, but not on hydrogenated diamond, indicating a strongly bound lithium-oxygen surface layer is formed, as predicted by recent theoretical modeling.

scholarly journals Copper photoelectrodeposition onto boron doped diamond electrodes at different doping level to enhance nitrate electroreduction.

2012 ◽  
Vol 1395 ◽  
Author(s):  
A. B. Couto ◽  
M. R. Baldan ◽  
N. G. Ferreira
Keyword(s):  
Nitrate Reduction ◽  
Doping Level ◽  
Diamond Films ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Buffer Solution ◽  
Solution Ph ◽  
High Doping Level ◽  
Copper Particles ◽  
Boron Doped

ABSTRACTPhotoelectrodeposition of copper on boron-doped diamond films (BDD) was investigated. In this work, two different doped films were analyzed. Copper particles were deposited in the potentiostat mode and under UV irradiation. The BDD film as-grown and the BDD film modifed with Cu (Cu/BDD) on the surface were characterized by Raman Spectroscopy and Scanning Electron Microscopy (SEM) respectivily. These electrodes were tested as electrocatalysts for nitrate reduction in Britton-Robinson buffer solution (pH=3). Electrochemical measurements showed that the electrode with high doping level displayed the best electrocatalytic activity.

Sludge electrooxidation as pre-treatment for anaerobic digestion

2016 ◽  
Vol 75 (4) ◽  
pp. 775-781 ◽  
Author(s):  
J. A. Barrios ◽  
U. Duran ◽  
A. Cano ◽  
M. Cisneros-Ortiz ◽  
S. Hernández
Keyword(s):  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Wastewater Sludge ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Treatment Conditions ◽  
Volatile Solids ◽  
Pre Treatment

Anaerobic digestion of wastewater sludge is the preferred method for sludge treatment as it produces energy in the form of biogas as well as a stabilised product that may be land applied. Different pre-treatments have been proposed to solubilise organic matter and increase biogas production. Sludge electrooxidation with boron-doped diamond electrodes was used as pre-treatment for waste activated sludge (WAS) and its effect on physicochemical properties and biomethane potential (BMP) was evaluated. WAS with 2 and 3% total solids (TS) achieved 2.1 and 2.8% solubilisation, respectively, with higher solids requiring more energy. After pre-treatment, biodegradable chemical oxygen demand values were close to the maximum theoretical BMP, which makes sludge suitable for energy production. Anaerobic digestion reduced volatile solids (VS) by more than 30% in pre-treated sludge with a food to microorganism ratio of 0.15 g VSfed g−1 VSbiomass. Volatile fatty acids were lower than those for sludge without pre-treatment. Best pre-treatment conditions were 3% TS and 28.6 mA cm−2.

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