scholarly journals Use of Stainless-Steel Electrodes on the Electrochemical Oxidation of Naproxen and its Transformation Products in Surface Water

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3604
Author(s):  
Miguel Ángel López Zavala ◽  
Diego Anglés Vega
Keyword(s):  
Stainless Steel ◽  
Surface Water ◽  
Electrochemical Oxidation ◽  
Oxidation Process ◽  
Reaction Times ◽  
Transformation Products ◽  
Treated Effluent ◽  
Degradation Rates ◽  
Steel Electrodes ◽  
Chloride Concentrations

In this study, stainless-steel electrodes were used to effectively oxidize naproxen and its transformation products in surface water by electrochemical oxidation in short reaction times. An evaluation of the effects of current density, chloride concentrations, and pH on the electrochemical oxidation process (mechanisms, kinetics, and reaction times) was conducted. Results showed that degradation rates of naproxen were greater, and the reaction times were shorter than those reported in other studies for other compounds and electrode materials. Oxidation naproxen and its transformation products were faster at high current densities, high chloride concentrations, and low pH conditions; however, good performance of the electrochemical oxidation process was observed at 16.3 mA/cm2 and pH 5 for both the naproxen and its transformation products, which were oxidized in only 15 min for the treated effluent and 30 min in the case of sludge. At pH 3 and 5, the number of transformation products and the reaction times required for achieving complete oxidation were greater in sludge than in the treated effluent; meanwhile, at pH 7 and 9, the number of transformation products and reaction times needed for non-detection were of the same order in both the treated effluent and the sludge.

scholarly journals Electrochemical oxidation of acetaminophen and its transformation products in surface water: effect of pH and current density

Heliyon ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. e03394
Author(s):  
Miguel Ángel López Zavala ◽  
Diego Anglés Vega ◽  
José Manuel Álvarez Vega ◽  
Odwer Francisco Castillo Jerez ◽  
Rodrigo Alejandro Cantú Hernández
Keyword(s):  
Surface Water ◽  
Electrochemical Oxidation ◽  
Current Density ◽  
Transformation Products ◽  
Water Effect ◽  
Effect Of Ph

Electrochemical oxidation of cinnamic acid using stainless steel electrodes

Ionics ◽  
2004 ◽  
Vol 10 (3-4) ◽  
pp. 283-287 ◽  
Author(s):  
T. Ramachandramoorthy ◽  
A. Rajendran ◽  
S. Padmavathy ◽  
N. Balasubramanian
Keyword(s):  
Stainless Steel ◽  
Electrochemical Oxidation ◽  
Cinnamic Acid ◽  
Steel Electrodes

Electrochemical Oxidation of Perfluorooctanesulfonate by Magnéli Phase Ti4O7 Electrode in the Presence of Trichloroethylene

2020 ◽  
Vol 1 (4) ◽  
Author(s):  
Peizeng Yang ◽  
Yaye Wang ◽  
Junhe Lu ◽  
Viktor Tishchenko ◽  
Qingguo Huang ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
First Order ◽  
Degradation Rates ◽  
Oxidation Technology ◽  
Magnéli Phase ◽  
Polyfluoroalkyl Substances ◽  
Titanium Suboxide ◽  
Gas Tight ◽  
Magneli Phase

This study examined the degradation of perfluorooctanesulfonate (PFOS) in electrochemical oxidation (EO) processes in the presence of trichloroethylene (TCE). The EO experiment was performed in a gas-tight reactor using Magnéli phase titanium suboxide (Ti4O7) as the anode. The experimental data demonstrated that 75% of PFOS (2 μM) was degraded at 10 mA/cm2 current density in 30 min without TCE present in the solution, while the presence of 76 μM TCE apparently inhibited the degradation of PFOS, reducing its removal down to 53%. Defluorination ratio suggested that PFOS was significantly mineralized upon EO treatment, and it appeared to be not influenced by the presence of TCE. The respective pseudo-first order rate constants (kobs) of PFOS removal were 0.0471 and 0.0254 min-1 in the absence and presence of TCE. The degradation rates of both PFOS and TCE increased with current density rising from 2.5 to 20 mA/cm2. In the presence of TCE, chloride, chlorate, and perchlorate were formed that accounted for 79.7 %, 5.53%, and 1.51% of the total chlorine at 60 min. This work illustrates the promise of the Magnéli phase Ti4O7 electrode based electrochemical oxidation technology for degrading per- and polyfluoroalkyl substances (PFASs) and co-contaminants in groundwaters.

scholarly journals Electrocoagulation Process by Using Aluminium and Stainless Steel Electrodes to Treat Total Chromium, Colour and Turbidity

2016 ◽  
Vol 19 ◽  
pp. 681-686 ◽  
Author(s):  
Mohd Khairul Nizam Mahmad ◽  
M.A.Z. Mohd Remy Rozainy ◽  
Ismail Abustan ◽  
Norlia Baharun
Keyword(s):  
Stainless Steel ◽  
Total Chromium ◽  
Electrocoagulation Process ◽  
Steel Electrodes
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