Preparation of Co/Ti electrode by electro-deposition for aqueous nitrate reduction

IF 2.3 Q2 Environmental Science Journal of Water Reuse and Desalination Pub Date : 2021-09-29 DOI:10.2166/wrd.2021.047

B. Jiang, Liqin Han, Juntian Wang, Chang Lu, Pan Yang, Yanlei Tan, C. Shuang, Dong Chen, Aimin Li

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引用次数: 4

Abstract

A Co/Ti electrode for nitrate reduction was prepared by electrode-deposition. In the single-compartment electrolysis cell, nitrate (100 mg/L) removal reached nearly 100% after 3 h electrolysis under the current density of 20 mA cm–2 by using the Co/Ti electrode as cathode, and the main reduction products were ammonium nitrogen (66.5%) and nitrogen gas (33.5%). This performance on nitrate removal was comparable to a Co3O4/Ti electrode, and the electroactivity of the Co/Ti electrode towards nitrite reduction was higher than that of a Co3O4/Ti electrode. The Co/Ti electrode exhibited an improved stability with 18.7% of mass loss and 25.5% of Co dissolution compared with the Co3O4/Ti electrode after ultrasonic interference. The presence of chlorine ion (1,000 mg/L) could promote the total nitrogen (TN) removal to approximately 100% after 3 h electrolysis because of the ammonium oxidation by the free chlorine produced from the anode. In the presence of calcium (50 mg/L) and phosphate (0.5 mg/L), the nitrate removal decreased from 85.4 ± 1.5 to 57.7 ± 3.5% after ten reuse cycles. This result suggests that Ca and P should be pre-removed before the electro-reduction of nitrate.

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电沉积法制备硝酸还原Co/Ti电极

采用电极沉积法制备了一种用于硝酸盐还原的钴/钛电极。在单室电解槽中，以Co/Ti电极为阴极，在20 mA cm–2的电流密度下电解3小时后，硝酸盐（100 mg/L）的去除率接近100%，主要还原产物为铵态氮（66.5%）和氮气（33.5%）。这种硝酸盐去除性能与Co3O4/Ti电极相当，并且Co/Ti电极对亚硝酸盐还原的电活性高于Co3O4/Ti电极的电活性。在超声干扰后，与Co3O4/Ti电极相比，Co/Ti电极表现出18.7%的质量损失和25.5%的Co溶解的改进的稳定性。氯离子（1000mg/L）的存在可以在电解3h后将总氮（TN）的去除率提高到约100%，因为阳极产生的游离氯会氧化铵。在钙（50mg/L）和磷酸盐（0.5mg/L）存在的情况下，10个重复使用周期后，硝酸盐的去除率从85.4±1.5%下降到57.7±3.5%。这一结果表明，在硝酸盐的电还原之前，应预先去除Ca和P。

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来源期刊

Journal of Water Reuse and Desalination ENGINEERING, ENVIRONMENTAL-WATER RESOURCES

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： Journal of Water Reuse and Desalination publishes refereed review articles, theoretical and experimental research papers, new findings and issues of unplanned and planned reuse. The journal welcomes contributions from developing and developed countries.