École de Technologie Supérieure, Montréal, Québec, H3C 1K3, Canada.
University of Quebec at Montreal, Department of Chemistry, Montréal, Québec, H3C 3P8, Canada.
Environ Res. 2020 Jun;185:109412. doi: 10.1016/j.envres.2020.109412. Epub 2020 Mar 21.
Aluminosilicate-catalyzed electrochemical decomposition of ammonium cation (NH) in water was investigated using NH-saturated clinoptilolite and copper-nickel electrodes in the presence of different salts and acidic species. The results showed beneficial roles of chloride anion and moderately acidic media. NH adsorbed by the zeolites was converted with a 98% selectivity into nitrogen. The process was found to obey zero-order kinetics in the presence of clinoptilolite and a first order process when NaCl is added. Beneficial buffering effects of the zeolite and acidic species were registered. Clinoptilolite turned out to act as both catalyst and NH reservoir. These results allow envisaging effective and waste-free technology in treating NH-rich aqueous effluents through total electroconversion into nitrogen using low cost aluminosilicates. Clay minerals, soils, sludges and natural water turbidity are potential catalysts for this purpose.
采用 NH 饱和斜发沸石和铜镍电极，在不同盐和酸性物质存在的条件下，研究了铵阳离子（NH）在水中的铝硅酸盐催化电化学分解。结果表明，氯离子和适度酸性介质具有有益作用。沸石吸附的 NH 以 98%的选择性转化为氮气。在斜发沸石存在的情况下，该过程被发现符合零级动力学，而当添加 NaCl 时，则符合一级动力学过程。沸石和酸性物质具有有益的缓冲作用。斜发沸石既是催化剂又是 NH 储存库。这些结果表明，通过使用低成本的铝硅酸盐将富含 NH 的水废水中的 NH 完全电化学转化为氮气，可以设想出一种有效且无废物的技术。粘土矿物、土壤、污泥和天然水浊度是实现这一目标的潜在催化剂。
