| Summary: | 碩士 === 淡江大學 === 水資源及環境工程學系碩士班 === 101 === This research attempts to confirm the formation of secondary oxidant during an electrochemical oxidation as well as its function of improving the degradation efficiency of the targeted organic, which was initially proposed in the three-pathway theory of electrochemical- oxidation. Cyclic voltammetry (CV) is utilized hereby to analyze the electrochemical reactions of Tetracycline (TC) happened adjacent to the working electrode in different pH environment when using Na2SO4 and NaCl as auxiliary electrolytes, respectively. In a cyclic voltammogram, the relationship between the current peak (Ip) and the square root of scan rate (V^(1/2)) could be used to determine whether the reactions happened around working electrode are diffusion controlled or chemical reaction controlled; in other words, to detect the production of secondary oxidant.
The CV analysis indicated a non-linear relationship between Ip and V^(1/2) when NaCl was used as the auxiliary electrolyte. As a result, there was some chemical reactions occurred near the working electrode, whichwould most possibly be the oxidation of TC by hypochlorite which was converted from the Cl-. Theoretically speaking, Na2SO4 should not generate any oxidant during the electro-oxidation; however, a linear relationship still could not be built between Ip and V^(1/2) when Na2SO4 served as the electroylte. The possible scenario is that other secondary oxidants may form during the electro-oxidation including, but not limited to, hydrogen peroxide, ozone and hydroxyl radical, all of which might trigger the oxidation of TC.
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