scholarly journals Performance of Reduced Titanium Oxide and Boron Doped Diamond as anodes in hyperthermophilic bioelectrochemical systems

2022 ◽  
Vol 334 ◽  
pp. 08009
Author(s):  
Laura Malavola ◽  
Silvia Franz ◽  
Massimiliano Bestetti ◽  
Nunzia Esercizio ◽  
Giuliana D’Ippolito ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Thermotoga Neapolitana ◽  
Carbon Cloth ◽  
Bioelectrochemical Systems ◽  
Boron Doped Diamond ◽  
Charge Densities ◽  
Boron Doped ◽  
Two Samples ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

This work investigates Reduced Titanium Oxide (RTO) in comparison with Carbon Cloth (CC) and commercial Boron Doped Diamond (BDD) as anodes in hyperthermophilic bioelectrochemical systems operating at 80°C by Thermotoga neapolitana. Two samples of RTO were synthesized by plasma electrolytic oxidation (PEO) of titanium plates and subsequent electrochemical reduction. Electrochemical performance of CC, BDD, and RTO are tested by performing cyclic voltammetry in the anodic region (0-1V, 50 mV/s), in abiotic and biotic conditions. The surface of colonized materials is observed by SEM microscopy. Results show that bacteria fast settle on all tested material, significantly affecting their electrochemical conductivity. The integration of voltammetric cycles reveals that biofilm generates capacitive effects on the anodic surfaces, particularly evident in RTO, less in CC and absent in BDD. Charge densities provided by capacitive response of RTO and CC are of the order of 5.58 and 0.77 mC/cm2, respectively.

Electrochemical Deposition of Titanium Oxide on Boron-Doped Diamond Electrodes

2005 ◽  
Vol 8 (10) ◽  
pp. C138 ◽  
Author(s):  
A. Manivannan ◽  
N. Spataru ◽  
K. Arihara ◽  
A. Fujishima
Keyword(s):  
Titanium Oxide ◽  
Electrochemical Deposition ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped

scholarly journals Boron-Doped Diamond/GaN Heterojunction—The Influence of the Low-Temperature Deposition

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6328
Author(s):  
Michał Sobaszek ◽  
Marcin Gnyba ◽  
Sławomir Kulesza ◽  
Mirosław Bramowicz ◽  
Tomasz Klimczuk ◽  
...  
Keyword(s):  
Diamond Film ◽  
Hydrogen Plasma ◽  
Chemical Vapour ◽  
Deposition Process ◽  
Chamber Pressure ◽  
Boron Doped Diamond ◽  
Preferential Formation ◽  
Boron Doped ◽  
Two Samples ◽  
Average Size

We report a method of growing a boron-doped diamond film by plasma-assisted chemical vapour deposition utilizing a pre-treatment of GaN substrate to give a high density of nucleation. CVD diamond was deposited on GaN substrate grown epitaxially via the molecular-beam epitaxy process. To obtain a continuous diamond film with the presence of well-developed grains, the GaN substrates are exposed to hydrogen plasma prior to deposition. The diamond/GaN heterojunction was deposited in methane ratio, chamber pressure, temperature, and microwave power at 1%, 50 Torr, 500 °C, and 1100 W, respectively. Two samples with different doping were prepared 2000 ppm and 7000 [B/C] in the gas phase. SEM and AFM analyses revealed the presence of well-developed grains with an average size of 100 nm. The epitaxial GaN substrate-induced preferential formation of (111)-facetted diamond was revealed by AFM and XRD. After the deposition process, the signal of the GaN substrate is still visible in Raman spectroscopy (showing three main GaN bands located at 565, 640 and 735 cm−1) as well as in typical XRD patterns. Analysis of the current–voltage characteristics as a function of temperature yielded activation energy equal to 93.8 meV.

Electro-Fenton for control and removal of micropollutants – process optimization and energy efficiency

2016 ◽  
Vol 74 (9) ◽  
pp. 2068-2074 ◽  
Author(s):  
E. Mousset ◽  
Z. Wang ◽  
O. Lefebvre
Keyword(s):  
Energy Efficiency ◽  
Current Density ◽  
Cost Effective ◽  
Aeration Rate ◽  
Carbon Cloth ◽  
Boron Doped Diamond ◽  
Bdd Anode ◽  
Boron Doped ◽  
Low Energy Consumption ◽  
Order Of Magnitude

The removal of micropollutants is an important environmental and health issue. Electro-Fenton offers an electrochemical advanced treatment that is particularly effective for the breakdown of aromatic contaminants. Due to the wide variety of chemicals, it is preferable to analyze model contaminants, such as phenol, when optimizing and assessing the efficacy of a novel treatment process. In this study, we therefore made use of innovative types of electrode material and optimized operating parameters (current density and aeration rate) for the removal of phenol by electro-Fenton, with a view to maximize the energy efficiency of the process. By determining the best current density (1.25 mA cm−2), frequency of aeration (continuous) and by using a boron-doped diamond (BDD) anode, it was possible to achieve over 98.5% phenol (1 mM) removal within 1.5 h. BDD further outcompeted platinum as anode material in terms of mineralization rate and yield, and displayed low energy consumption of 0.08 kWh (g-TOC)−1, about one order of magnitude lower than other advanced oxidation processes, such as UV/TiO2 and UV/O3. Furthermore, a carbon cloth anode proved even more cost-effective than BDD if the end goal is the removal of phenol by electro-Fenton instead of complete mineralization.

Effect of Surface Characteristics on Bioactivity of Ceramic Coating on Ti6al4v by Plasma Electrolytic Oxidation

2011 ◽  
Vol 320 ◽  
pp. 33-37
Author(s):  
Zhi Yong Yang ◽  
Ling Qin Xia ◽  
Wei Wei Sun ◽  
Wei Jing Li
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Ceramic Coating ◽  
Surface Characteristics ◽  
Chemical Compositions ◽  
Two Samples ◽  
Electrolytic Oxidation ◽  
Calcium Phosphorus ◽  
Ft Ir ◽  
Plasma Electrolytic ◽  
3D Profile

The surface topographic of ceramic coating on Ti6Al4V alloy, which was fabricated by Plasma Electrolytic Oxidation, was investigated by SEM and 3D profile. The chemical compositions and the phase structures were detected by EDS, XRD, FT-IR. The PEO coating shows a rough porous morphology and the chemical phases are anatase and rutile TiO2. In addition, both of calcium-phosphorus ratios of the two samples were above 1.67. The bioactivity was focused on after soaking in SBF (simulated body fluid). It can be concluded by the experimental data that the surface roughness and the composition are corelated to form hydroxyapatite (HA), and the coatings containing Ca and P can induce bioapatite quickly.

scholarly journals Electrolytic Oxidation as a Sustainable Method to Transform Urine into Nutrients

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 460
Author(s):  
Nasr Bensalah ◽  
Sondos Dbira ◽  
Ahmed Bedoui ◽  
Mohammad I. Ahmad
Keyword(s):  
Thin Film ◽  
Oxygen Demand ◽  
Organic Pollution ◽  
Active Chlorine ◽  
Boron Doped Diamond ◽  
Dimensionally Stable Anodes ◽  
Boron Doped ◽  
Electrolytic Oxidation ◽  
Current Densities ◽  
Electrolytic Treatment

In this work, the transformation of urine into nutrients using electrolytic oxidation in a single-compartment electrochemical cell in galvanostatic mode was investigated. The electrolytic oxidation was performed using thin film anode materials: boron-doped diamond (BDD) and dimensionally stable anodes (DSA). The transformation of urine into nutrients was confirmed by the release of nitrate (NO3−) and ammonium (NH4+) ions during electrolytic treatment of synthetic urine aqueous solutions. The removal of chemical oxygen demand (COD) and total organic carbon (TOC) during electrolytic treatment confirmed the conversion of organic pollutants into biocompatible substances. Higher amounts of NO3− and NH4+ were released by electrolytic oxidation using BDD compared to DSA anodes. The removal of COD and TOC was faster using BDD anodes at different current densities. Active chlorine and chloramines were formed during electrolytic treatment, which is advantageous to deactivate any pathogenic microorganisms. Larger quantities of active chlorine and chloramines were measured with DSA anodes. The control of chlorine by-products to concentrations lower than the regulations require can be possible by lowering the current density to values smaller than 20 mA/cm2. Electrolytic oxidation using BDD or DSA thin film anodes seems to be a sustainable method capable of transforming urine into nutrients, removing organic pollution, and deactivating pathogens.

Sign in / Sign up

Export Citation Format

Share Document