The effect of carbonized zeolitic imidazolate framework-67 (ZIF-67) support on the reactivity and selectivity of bimetal-catalytic aqueous NO3 − reduction
Absalyamova M. Nurmyrza M. Nurlan N. Bae S. Lee W.
June 2024Elsevier Ltd
Chemosphere
2024#358
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 Cos promotor role for NO3 − reduction to less oxidized nitrogen species and Pts 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.
Carbonized ZIF-67 (Co@NC) support , Catalytic nitrate reduction , Green ammonia , Pt–Co@NC , ZIF-67
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Laboratory of Environmental Systems, National Laboratory Astana, Nazarbayev University, Astana, 010000, Kazakhstan
Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul, 05029, South Korea
Laboratory of Environmental Systems
Civil and Environmental Engineering
Civil and Environmental Engineering
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