The effect of carbonized zeolitic imidazolate framework-67 (ZIF-67) support on the reactivity and selectivity of bimetal-catalytic aqueous NO3 − reduction

被引：2
作者：
Absalyamova M. [1 ]
Nurmyrza M. [1 ,2 ]
Nurlan N. [1 ]
Bae S. [3 ]
Lee W. [1 ,2 ]
机构：
[1] Laboratory of Environmental Systems, National Laboratory Astana, Nazarbayev University, Astana
[2] Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana
[3] Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul
来源：
Chemosphere | 2024年 / 358卷
关键词：
Carbonized ZIF-67 (Co@NC) support; Catalytic nitrate reduction; Green ammonia; Pt–Co@NC; ZIF-67;
D O I：
10.1016/j.chemosphere.2024.142161
中图分类号：
学科分类号：
摘要：
A metallic catalyst, Cobalt N-doped Carbon (Co@NC), was obtained from Zeolitic-Imidazolate Framework-67 (ZIF-67) for efficient aqueous nitrate (NO3 −) removal. This advanced catalyst indicated remarkable efficiency by generating valuable ammonium (NH3/NH4 +) via an environmentally friendly production technique during the nitrate treatment. Among various metals (Cu, Pt, Pd, Sn, Ru, and Ni), 3.6%Pt–Co@NC exhibited an exceptional nitrate removal, demonstrating a complete removal of 60 mg/L NO3 −-N (265 mg/L NO3 −) in 30 min with the fastest removal kinetics (11.4 × 10−2 min−1) and 99.5% NH4 + selectivity. The synergistic effect of bimetallic Pt–Co@NC led to 100% aqueous NO3 − removal, outperforming the reactivity by bare ZIF-67 (3.67%). The XPS analysis illustrated Co's promotor role for NO3 − reduction to less oxidized nitrogen species and Pt's hydrogenation role for further reduction to NH4 +. The durability test revealed a slight decrease in NO3 − removal, which started from the third cycle (95%) and slowly proceeded to the sixth cycle (80.2%), while NH4 + selectivity exceeded 82% with no notable Co or Pt leaching throughout seven consecutive cycles. This research shed light on the significance of the impregnated Pt metal and Co exposed on the Co@NC surface for the catalytic nitrate treatment, leading to a sustainable approach for the effective removal of nitrate and economical NH4 + production. © 2024 Elsevier Ltd
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