Cl-、NH4+、CO32-离子和天然有机物对掺硼金刚石电极电解制备过硫酸盐的影响
The effect of Cl-,NH4+,CO32- ions and natural organic matter on persulfate preparation by boron-doped diamond electrode electrolysis
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摘要: 文章考察了水中几种常见的离子Cl-、NH4+、CO32-和天然有机物（NOM）对掺硼金刚石（BDD）阳极电解硫酸钠生成过硫酸盐（S2O82-）的影响，以及硫酸钠作为阳极背景电解液时，不同添加物可能在电解氧化过程中的变化.结果表明，Cl-对过硫酸盐的生成在电解的前10 min内有抑制作用，但之后过硫酸盐的合成速率更快；在硫酸钠背景电解质中，次氯酸/次氯酸盐和氯酸盐的生成量明显增加，与之相比，高氯酸盐的增加量并不明显.硫酸钠阳极液中添加NH4+可以抑制析氧副反应，使过硫酸盐的生成浓度增加；电解中NH4+的浓度下降了17.6%，可能是被氧化成N2逸出.CO32-对过硫酸盐生成的影响并不明显.NOM的存在可以减少过硫酸盐的合成量；NOM在硫酸盐阳极液中的降解与直接电解均符合一级反应动力学，硫酸盐的存在增加了NOM降解的表观反应速率.
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关键词:
- 掺硼金刚石(BDD) /
- 过硫酸盐 /
- 电化学合成 /
- 离子 /
- 天然有机物(NOM)
Abstract: The effect of several common ions, including Cl-,NH4+ and CO32-, and natural organic matter (NOM) in water on the process in which boron-doped diamond (BDD) anode electrolyzed sodium sulfate to produce persulfate (S2O82-) was experimentally elucidated. And the possible reactions of different coexisting substance in the electrochemical oxidation process were also investigated, when sodium sulfate was used as the background electrolyte of anode. The results showed that Cl- inhibited the generation of persulfate in the first 10 min of electrolysis, but later accelerated the synthetic rate of persulfate. In sodium sulfate electrolyte, the production of hypochloric acid/hypochlorite and chlorate increased significantly, while the production of perchlorate did not increase evidently. The oxygen evolution reaction was inhibited by adding NH4+ to sodium sulfate anolyte, resulting in the increased concentration of persulfate. During the electrolysis, it was found that the concentration of NH4+ decreased by 17.6%, which might be oxidized to N2 and escaped from the solution. CO32- did not present any significant inhibiting or promoting effect on the production of persulfate. The presence of NOM reduced the synthesis of persulfate. In addition, sulfate increased the apparent reaction rate of the degradation of NOM. As with direct electrolysis, the degradation of NOM in sulfate anolyte complied with the kinetics of first-order reaction.-
Key words:
- boron-doped diamond(BDD) /
- persulfate /
- electrochemical synthesis /
- ions /
- natural organic matter (NOM)
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