| 徐腾遥,于洪涛,康文达,顾雨薇.Cu(OH)2纳米线/Cu网电极制备及还原水中硝酸盐性能研究[J].,2023,63(5):463-471 |
| Cu(OH)2纳米线/Cu网电极制备及还原水中硝酸盐性能研究 |
| Preparation of Cu(OH)2 nanowire/ Cu mesh electrode and performance study of reducing nitrate in water |
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| DOI：10.7511/dllgxb202305004 |
| 中文关键词:阳极氧化Cu(OH)2纳米线Cu网阴极硝酸盐还原总氮去除 |
| 英文关键词:anodic oxidationCu(OH)2 nanowireCu mesh cathodenitrate reductiontotal nitrogen removal |
| 基金项目:国家自然科学基金资助项目(21876021). |
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| 摘要点击次数:120 |
| 全文下载次数:138 |
| 中文摘要: |
| 工厂化养殖尾水中硝酸盐污染问题日益严重，而电化学还原技术中铜作为阴极材料去除NO-3-N存在活性位点少和吸附能力差的问题．为此采用一种具有高长径比(120)的Cu(OH)2纳米线/Cu网电极材料应用于NO-3-N的电催化还原．首先，通过调控阳极氧化条件制备了Cu(OH)2纳米线/Cu网．然后，通过对Cu(OH)2纳米线/Cu网进行表征分析和去除NO-3-N性能测试，确定25 ℃、1.0 mol/L NaOH和2.0 mA/cm2为Cu(OH)2纳米线/Cu网最佳阳极氧化条件．在双池隔膜反应器中，以该电极为阴极，RuO2-IrO2-TiO2/Ti为阳极，对NO-3-N(50 mg/L)去除率达到98%，NO-3-N还原速率达到0.011 1 min-1/cm2，是相同实验条件下未处理铜电极还原速率的6.5倍．最后，为了实现总氮(TN)去除，采用单池反应器，向体系中加1.0 g/L的氯离子将阴极产生的氨氮进一步转化为氮气，总氮去除率达到91%．循环实验结果显示该电极具有良好的稳定性，并且将该电极应用到实际水中NO-3-N的去除，总氮去除率达到92%． |
| 英文摘要: |
| Nitrate pollution in factory aquaculture tail water is increasingly serious. In electrochemical reduction technology, copper as cathode material for NO-3-N removal has the problems of few active sites and poor adsorption capacity. So Cu(OH)2 nanowire/Cu mesh electrode material with high length-to-diameter ratio (120) is proposed for the electrocatalytic reduction of NO-3-N. Firstly, the Cu(OH)2 nanowire/Cu mesh is prepared by adjusting the anodizing conditions. Then, through the characterization and analysis of Cu(OH)2 nanowire/ Cu mesh and the evaluation of NO-3-N removal performance, the optimal anodizing conditions for Cu(OH)2 nanowire/Cu mesh are determined to be 25 ℃, 1.0 mol/L NaOH and 2.0 mA/cm2. With this electrode as the cathode and RuO2-IrO2-TiO2/Ti as the anode, the removal rate of NO-3-N (50 mg/L) reaches 98% in the double-diaphragm reactor. The NO-3-N reduction rate of the cathode material reaches 0.011 1 min-1/cm2, which is 6.5 times that of the untreated copper electrode under the same conditions. Finally, in order to achieve total nitrogen (TN) removal, 1.0 g/L chloride ion is used to further convert the ammonia nitrogen produced by the cathode into nitrogen in a single cell reactor, and the total nitrogen removal rate reaches 91%. The results of cycling experiments show that the electrode has good stability, and the electrode is applied to the removal of NO-3-N in actual water, the total nitrogen removal rate reaches 92%. |
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