Electrochemical Destruction of p-Phenylenediamine in Aqueous Solution by Electro-Fenton Methods
Date Issued
2011
Date
2011
Author(s)
Chang, Yu-Shu
Abstract
Advanced oxidation process is the best method for wastewater treatment. According to the different classification of reaction mechanisms, Electro-Fenton process and Photo-catalytic reaction have most widely applications. In this study, the AP-CC represented that the anode was Platinum (Pt) or Platinum Titanium mesh (Ti/Pt) ,and the cathode was carbon cloth which was fed with oxygen. The applied current was set to produce H2O2 at the cathode. When the Fe2+ was added into the solution, the system was called AP(T)-CC-Fe2+ system in this research. Next, without O2 injection to cathode, O2 was produced by electrolysis of water from various size of anode to provide to the cathode. Afterward, the iron (Fe) replaced the Pt as the anode with zero applied current, which is the system named AF-CC-Shunt. Besides, the Fe was oxidized to generate current and Fe2+, and the organics would be decomposed by Fenton process.
The flow rate of oxygen, the initial pH value, the applied current , and the reaction temperature were discussed in the H2O2 formation. The initial formation rate of H2O2 is proportional to the applied current. Moreover, electrode reaction and overall reaction system were combined to make derive kinetic derivation and fit the data of H2O2 formation.
The initial pH value and the applied current were discussed in the Fe2+ reduction to find out the optimal current efficiency. Under pH<3, the formation of Fe(OH)3 and Fe2O3 would be prohibited to increase the efficiency.
Due to its popular applications in hair dye and artificial fiber synthetic industry, p-Phenylenediamine causes the quite serious environmental pollution and destroys the metabolism of human being. The initial pH value of reaction system was 2.5. The initial Fe2+ concentration and the applied current were discussed in AP-CC-Fe2+ system. The optimal concentration of Fe2+ is 3mM.
Higher anodic surface area would interrupt Fenton process due to the domination of p-Phenylenediamine oxidation on the surface of Platinum Titanium mesh. According to the AF-CC-Shunt system in the self electro-generative process, the influences of the temperature on degradation and self-generative current were studied. The degradation efficiency was enhanced, due to higher current generated by rapid oxidation of Fe at higher temperature. Compared with other Electro-Fenton processes, in AF-CC-Shunt system, p-phenylenediamine can be degraded by self electro-generative process without applied current and Fenton reagents.
Subjects
Advanced oxidation process
p-phenylenediamine
Electro-Fenton process
anodic oxidation of iron
self electro-generative current
SDGs
Type
thesis
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