氯
阳极
氧化剂
电解
矿化(土壤科学)
电解质
化学
纳米颗粒
降级(电信)
阴极
次氯酸盐
电极
核化学
无机化学
材料科学
纳米技术
有机化学
物理化学
电信
计算机科学
氮气
作者
L. Carolina Espinoza,Pamela Sepúlveda,Alejandra García,Denis Ricardo Martins de Godoi,Ricardo Salazar
出处
期刊:Chemosphere
[Elsevier]
日期:2020-07-01
卷期号:251: 126674-126674
被引量:31
标识
DOI:10.1016/j.chemosphere.2020.126674
摘要
Dimensionally stable anodes (DSA) have been widely used to degrade organic compounds because these surfaces promote the electrogeneration of active chlorine species in the bulk of the solution, as well as in the vicinity of the anode when NaCl is used as supporting electrolyte. In this work, the nanoparticles synthesis of IrO2 and RuO2 was performed to obtain two types of DSA electrodes named Class I and II to degrade oxamic acid. For Class I and II DSA, the nanoparticles used were synthesized separately and in the same reaction medium, respectively. Electrolysis were carried out in an open cylindrical cell without division at 25 °C, DSAs were used as anodes and a stainless-steel electrode as cathode, both elements have a geometric area of 2.8 cm2 immersed in 0.05 mol L-1 of NaCl or Na2SO4 and a current density of 3 mA cm-2 was applied for 6 h. Active chlorine species generated in the absence of oxamic acid in NaCl were also detected and quantified through ion chromatography. In Na2SO4 there was no degradation of the compound, but in NaCl the oxamic acid concentration reaching 85% with Class I DSA. The same tendency is observed in mineralization, in which Class I DSA allowed reaching a CO2 transformation close to 73%. The difference in the results occurs because with Class I DSA, more hypochlorite is generated than with Class II and therefore there is a larger amount of oxidizing species in the solution that enables the degradation and mineralization of oxamic acid.
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