scholarly journals Electrochemical Investigation of Phenol Oxidation by a TiO2/GAC Based Packed-Bed Electrode Reactor

2018 ◽  
pp. 7301-7309 ◽  
Author(s):  
Qing Chen ◽  
Keyword(s):  
Packed Bed ◽  
Phenol Oxidation ◽  
Electrochemical Investigation ◽  
Packed Bed Electrode

Modeling approach to phenol oxidation by a sand-based packed-bed electrode system (SPBEs)

2012 ◽  
Vol 66 (2) ◽  
pp. 422-428 ◽  
Author(s):  
Lizhang Wang ◽  
Peng Li ◽  
Qian Yan
Keyword(s):  
Mass Transport ◽  
Current Density ◽  
Oxygen Demand ◽  
Cell Voltage ◽  
Packed Bed ◽  
Theoretical Description ◽  
Electrode System ◽  
Phenol Oxidation ◽  
Packed Bed Electrode ◽  
Initial Ph

A comparative study of phenol oxidation using pure electrolysis (PEs) and sand-based packed-bed electrode systems (SPBEs) was performed under conditions of phenol concentration 800 mg L−1, initial pH 6.5, current density 100 A m−2 and sodium sulfate (Na2SO4) 3.0% (w/w) on IrO2–Ta2O5/Ti anode. The results show quartz sand, a non-conducting material is incapable of expanding the electrode area and the phenol oxidation in SPBEs commences only at the electrode surface. From the theoretical description of the mass transport coefficient and chemical oxygen demand (COD), we confirm that the enhancement of the COD removal efficiency, current and space–time yields in SPBEs is due to the improvement of mass transport properties. The proposed SPBEs shows superiority to the PEs on saving energy at the same applied voltage, however, when operated under the same applied current density the energy consumption of the former would be much higher than that of the latter because of the rise of the applied cell voltage.

scholarly journals A Carbon Nanotube Packed Bed Electrode for Small Molecule Electrosorption: An Electrochemical and Chromatographic Approach for Process Description

2020 ◽  
Vol 10 (3) ◽  
pp. 1133
Author(s):  
Tatjana Trunzer ◽  
Timothy Stummvoll ◽  
Melanie Porzenheim ◽  
Paula Fraga-García ◽  
Sonja Berensmeier
Keyword(s):  
Structural Changes ◽  
Aqueous Media ◽  
Electrical Potential ◽  
Packed Bed ◽  
Electrical Potentials ◽  
Packed Bed Electrode ◽  
Through Flow ◽  
Multi Walled Carbon Nanotubes ◽  
Electrochemical Double Layer ◽  
Walled Carbon Nanotubes

Triggering the interaction of nanomaterials with molecules by means of electrical potentials in aqueous media remains challenging, especially if 3D through-flow systems are used as electrodes, as in potential-controlled liquid chromatography (PCC). In this paper, multi-walled carbon nanotubes (MWCNTs) function as a particulate packed bed electrode in order to study the system’s response to various applied potentials and electrolyte compositions. The process principle was analyzed using chronoamperometry and cyclic voltammetry. Applying an electrical potential to the hydrophilic MWCNTs induces the presence of both capacitive and faradaic currents. This leads, over time, to a degradation of the electrode due to structural changes of the MWCNT matrix and an increase in redox reactions on the surface. The role of the electrochemical double layer (EDL) is highlighted as a main player in the process, directly influencing the adsorption capability of the electrode. The EDL rearrangement time and coverage radius depend on the composition of the mobile phase and on the potential applied. The capacity of the electrode for the target (maleic acid) increases at high positive potentials (+800 mV vs. Ag/AgCl), while the presence of electrolytes leads to a capacity decrease. Our research enhances the understanding of capacitive through-flow cells.

A new strategy for determination of current efficiency during electro-oxidation of aromatic compounds in a packed-bed system

2011 ◽  
Vol 63 (11) ◽  
pp. 2685-2691 ◽  
Author(s):  
Lizhang Wang ◽  
Yuemin Zhao ◽  
Qingyu Gao ◽  
Cheng Qian ◽  
Yunlong Hu
Keyword(s):  
Current Efficiency ◽  
Aromatic Compounds ◽  
Oxygen Demand ◽  
Packed Bed ◽  
Electrode System ◽  
Electrode Distance ◽  
Faradaic Current ◽  
Packed Bed Electrode ◽  
New Strategy ◽  
Electro Oxidation

The electro-oxidation of aromatic compounds in 4,4′-diaminostilbene-2,2′-disulfonic (DSD) acid wastewater on IrO2–Ta2O5/Ti anodes was studied. The current efficiency was evaluated in terms of chemical oxygen demand (COD) by introducing a new factor, the fraction of the Faradaic current to the total cell current (β) through the network analysis of packed bed electrode system (PBEs). Experimental results using an up-flow PBEs at current intensities ranging from 5 to 16 A m−2, flow rates ranging from 20 to 80 L h−1 and inter-electrode distance of 5 to 50 cm are in good agreement with the proposed equation. In addition, lower current density, increasing flow rate and larger inter-electrode distance are beneficial to enhance the current efficiency.

Electro-oxidation rate ofp-tert-butyltoluene in a bipolar packed-bed electrode cell

1987 ◽  
Vol 17 (6) ◽  
pp. 1213-1222 ◽  
Author(s):  
Hark Joon Kim ◽  
Katsuki Kusakabe ◽  
Satoko Hokazono ◽  
Shigeharu Morooka ◽  
Yasuo Kato
Keyword(s):  
Oxidation Rate ◽  
Packed Bed ◽  
Packed Bed Electrode ◽  
Electrode Cell ◽  
Electro Oxidation

Studies on paired packed-bed electrode reactor: Modeling and experiments

1999 ◽  
Vol 54 (13-14) ◽  
pp. 2969-2977 ◽  
Author(s):  
Xin-Sheng Zhang ◽  
Guo-Bin Wu ◽  
Ping Ding ◽  
Xing-Gui Zhou ◽  
Wei-Kang Yuan
Keyword(s):  
Packed Bed ◽  
Reactor Modeling ◽  
Packed Bed Electrode ◽  
Modeling And Experiments

scholarly journals Modification of the Packed-bed Electrode and Its Potential Distribution

1976 ◽  
Vol 49 (12) ◽  
pp. 3372-3375 ◽  
Author(s):  
Shiro Yoshizawa ◽  
Zenichiro Takehara ◽  
Zempachi Ogumi
Keyword(s):  
Potential Distribution ◽  
Packed Bed ◽  
Packed Bed Electrode
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