摘要
针对电化学氧化法处理氨氮废水过程中钌铱基电极制备成本高、稳定性不足的问题,采用浸渍提拉法制备了Ti/RuO_(2)-IrO_(2)-SnO_(2)-CeO_(2)四元改性电极。研究发现,当Ru-Ir-Sn摩尔比为5.5∶1∶3.9时,Sn掺入导致RuO_(2)-IrO_(2)固溶体晶格发生畸变,晶体平均尺寸由34.1 nm减小至28.4 nm,析氯电位窗口拓宽20.8%,电极制备成本大大降低;掺杂质量分数4%Ce时,涂层晶粒尺寸细化至22.5 nm,析氯催化活性显著提升,电极服役寿命较三元电极延长60.2%。在优化工艺条件(电流密度0.05 A/cm^(2)、初始Cl-质量浓度5000 mg/L、pH 9.0)下,氨氮和总氮去除率分别达到100%和98.5%,氨氮去除过程符合零级动力学模型。
In view of the problems of high preparation cost and insufficient stability of ruthenium-iridium-based electrodes in the treatment of ammoniacal nitrogen-containing wastewater by electrochemical oxidation method,Ti/RuO_(2)-IrO_(2)-SnO_(2)-CeO_(2)quaternary modified electrode is prepared via the dip-coating method.Research findings show that as the molar ratio of Ru-Ir-Sn is 5.5∶1∶3.9,the incorporation of Sn causes the lattice distortion in RuO_(2)-IrO_(2)solid solution,the average crystal size declines from 34.1 nm to 28.4 nm,the chlorine evolution potential window widens by 20.8%,and the preparation cost of the electrode is greatly reduced.As 4%(w/w)Ce is doped,the grain size of the coating is refined to 22.5 nm,the chlorine evolution catalytic activity of the electrode is significantly improved,and the service life of the electrode is extended by 60.2% compared with the ternary electrode.Under the optimized process conditions(a current density of 0.05 A/cm^(2),an initial Cl-concentration of 5000 mg/L,and a pH of 9.0),the removal rates of NH3-N and TN reach 100% and 98.5%,respectively,and the ammoniacal nitrogen removal process conforms to the zero-order kinetic model.
作者
张寿通
李阳
王文虎
阎光绪
ZHANG Shou-tong;LI Yang;WANG Wen-hu;YAN Guang-xu(Faulty of Engineering,Karamay Campus,China University of Petroleum-Beijing,Karamay 834000,China;Sinopec Jianghan Petroleum Engineering&Design Co.,Ltd.,Wuhan 430223,China;College of Science,China University of Petroleum-Beijing,Beijing 102249,China)
出处
《现代化工》
北大核心
2025年第11期138-147,153,共11页
Modern Chemical Industry
基金
中国石油大学(北京)克拉玛依校区科研启动基金(XQZX20240030)。
关键词
电化学
掺杂改性
废水
动力学
活性
稳定性
electrochemical
doping modification
wastewater
kinetics
activity
stability
