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• W2993847785 abstract "NiO and NiO–TiO 2 nano-catalysts were synthetized using solution combustion synthesis (SCS) method and tested toward ammonia oxidation in synthetic and real wastewater. As-synthesized NiO nano-catalyst showed a tightly agglomerated nano-porous spherical structure with sizes ranging from 10 to 50 nm. NiO–TiO 2 nano powders have homogenous structure with an average size of 19.5 ± 0.03 nm and a lattice spacing of 0.22 ± 0.03 nm corresponding to cubic planes of NiO and 0.25 ± 0.01 nm corresponding to TiO 2 . Cyclic voltammetry under alkaline condition at low potential ranging from 0.95 to 1.35 V vs. HgO/Hg improved the electro-chemical activity of the nano-catalysts by the formation of Ni(OH) 2 film on the surface of catalyst as confirmed by XPS measurements. Ammonia electro-oxidation on nano-catalysts occurred at approximately 1.28 V vs. HgO/Hg and was highly pH-dependent. Ammonia removals up to 92.9 and 96.4% were achieved by NiO and NiO–TiO 2 , respectively. Total nitrogen material balance showed that the electro-chemical oxidation of ammonia produce small amounts of NO 2 − and NO 3 and the balance N 2 . Ammonia oxidation at concentration less than 150 mM followed direct electron transfer mechanism, whereas at higher concentrations, the oxidation mechanism shifted to the indirect oxidation regime. Ammonia electro-oxidation kinetics followed zero order reaction at ammonia concentration ≤100 mM and first order kinetics at higher concentrations. More than 93% of ammonia, 35% of organic matter and 40% phosphorous were removed from real wastewater samples using electro-oxidation process confirming the suitability of this technology as advanced wastewater treatment. • Electro-chemical activity of NiO improved by formation of Ni(OH) 2 film at high pH. • Ammonia elctro-chemical oxidation produced les oxygenated species and the balance N 2 . • Synthesized nano-particles were activated toward ammonia oxidation in alkaline phase. • NiO and NiO–TiO 2 nano-catalysts were used as advanced wastewater treatment technology." @default.
• W2993847785 created "2019-12-13" @default.
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• W2993847785 date "2020-03-01" @default.
• W2993847785 modified "2023-10-16" @default.
• W2993847785 title "Electrochemical oxidation of ammonia on nickel oxide nanoparticles" @default.
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• W2993847785 doi "https://doi.org/10.1016/j.ijhydene.2019.11.071" @default.
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