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电化学氧化法处理含盐苯醌模拟废水研究
薛娟琴1, 张立华2, 于丽花1
0
(1.西安建筑科技大学冶金工程学院;2.西安建筑科技大学环境与市政工程学院)
摘要:
利用钛基二氧化铅电极(Ti/PbO2)作为电催化活性阳极,通过电化学氧化技术对苯醌进行降解矿化。考察了常见共存无机盐对苯醌废水降解效率的影响。结果发现,NaCl存在下苯醌废水溶液的COD去除率相比硝酸盐提高了62%、相比硫酸盐提高了45%,NaCl能够显著增强电氧化去除苯醌的电流效率。苯醌的降解对氯离子非常敏感,存在少量的氯离子即可以引起氧化效率明显增加。氯离子浓度越大,苯醌模拟废水的COD去除率越高,但当氯离子浓度高于0.30mol?L-1时,COD去除率反而有所下降。pH为8的弱碱性环境更有利于含氯离子苯醌废水的电氧化降解反应。提高电流密度可增大COD去除率;但升高温度会降低COD去除率。在pH为8,NaCl浓度为0.3mol?L-1,电流密度为10mA?cm-2,温度为20℃的条件下,初始浓度为100mg?L-1苯醌经3h电化学氧化降解后COD去除率可达80.9%。通过高效液相色谱对电氧化降解苯醌的中间产物进行分析,发现氯离子存在下苯醌的降解速度显著提高,中间产物顺丁烯二酸的生成速度更快,充分说明由氯离子生成的强氧化剂对苯醌具有极强的开环能力。
关键词:  电化学氧化  苯醌  COD  活性氯  含盐废水
DOI:
投稿时间:2018-09-23修订日期:2019-03-05
基金项目:
Treatment of salt-containing benzoquinone simulated wastewater by electrochemical oxidation
Abstract:
Benzoquinone was degraded and mineralized by means of electrochemical oxidation technique with titanium-based lead dioxide (Ti/PbO2) as an active anode. The effect of common inorganic salts on the degradation efficiency of benzoquinone wastewater was investigated. The results showed that the COD removal rate of benzoquinone wastewater in the presence of NaCl was 62% higher than that of nitrate and 45% higher than that of sulfate. Therefore, NaCl can significantly enhance the current efficiency of benzoquinone mineralization. The electro-degradation of benzoquinone is very sensitive to chloride ions, and the presence of a small amount of chloride ions can lead to a significant increase in degradation efficiency. The higher the chloride concentration, the higher the COD removal rate of the benzoquinone simulated wastewater. However, when the chloride concentration was higher than 0.30mol?L-1, the removal rate of COD decreased. The weak alkaline environment with pH value at 8 is more favorable to the electro-degradation of the benzoquinone containing wastewater. Increasing the current density can increase the removal rate of COD, but increasing the temperature will reduce the removal rate of COD. Under the conditions of pH =8, 0.3mol?L -1 NaCl, current density of 10 mA?cm -2 and temperature of 20℃, the removal rate of COD of benzoquinone with initial concentration of 100 mg?L -1 can reach 80.9% after 3 h electro-oxidation degradation. High performance liquid chromatography (HPLC) was used to analyze the intermediate products of electro-oxidation degradation of benzoquinone. It was found that in the presence of chloride ion the degradation rate of benzoquinone increased significantly and the formation rate of maleic acid was faster, which can fully prove that the strong oxidant produced by chlorine ion has remarkable ability to open the aromatic ring of benzoquinone.
Key words:  electrochemical oxidation  benzoquinone  COD  active chlorine  wastewater containing salt