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pH-Dependent Electrocatalytic Aqueous Ammonia Oxidation to Nitrite and Nitrate by a Copper(II) Complex with an Oxidation-Resistant Ligand.
J Am Chem Soc
January 2025
Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States.
The electrocatalytic aqueous ammonia oxidation (AO) represents a more sustainable alternative to accessing nitrite (NO) and nitrate (NO). We now report that Cu(pyalk) {pyalk = 2-(pyridin-2-yl)propan-2-oate}, previously employed as a homogeneous water oxidation (WO) catalyst, is also active for selective AO in aqueous environments. The traditional Griess analytical test for NO/NO was modified to permit the operation in the presence of the otherwise interfering Cu ion.
View Article and Find Full Text PDFAchieving stable partial nitrification by exploiting lag phase of NOB recovery for selective washout.
Environ Res
January 2025
Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Stable inhibition of nitrite-oxidizing bacteria (NOB) is a significant challenge in achieving partial nitrification (PN) and partial nitrification-anaerobic ammonia oxidation (PNA). Growing evidence suggested that NOB can develop resistance to suppression over time, leading to the re-enrichment of NOB within reactors. To address these issues, this study aimed to achieve stable PN by regulating SRT to selectively washout NOB during the lag phase of activity recovery following FA/FNA exposure.
View Article and Find Full Text PDFFault detection and diagnosis of the wastewater nitrate and nitrite sensors using PCA and FDA combined with assessment of the economic and environmental impact of the faults.
Environ Monit Assess
January 2025
Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University of Cluj-Napoca, 11 Arany János Street, 400028, Cluj-Napoca, Romania.
One of the leading challenges in Water Resource Recovery Facility monitoring and control is the poor data quality and sensor consistency due to the tough and complex circumstances of the process operation. This paper presents a new principal component analysis fault detection approach for the nitrate and nitrite concentration sensor based on Water Resource Recovery Facility measurements, together with the Fisher Discriminant Analysis identification of fault types. Five malfunction cases were considered: constant additive error, ramp changing error in time, incorrect amplification error, random additive error, and unchanging sensor value error.
View Article and Find Full Text PDFNovel, Rapid, and Simple Isocratic UPLC-UV Method for Estimating Nitrate and Nitrite Contents in Environmental Water Samples Using an Analytical Quality by Design Approach.
ACS Omega
December 2024
Professor, Department of Chemistry, ANITS College, Visakhapatnam 531162, India.
In this study, we reported a novel reverse-phase UPLC method for the simultaneous estimation of nitrite and nitrate ions using a Quality by Design (QbD) approach. Nitrite and nitrate ions were separated on an ACQUITY CSH Fluoro-Phenyl column (100 × 2.1 mm, 1.
View Article and Find Full Text PDFHomogenous catalysis of peroxynitrite conversion to nitrate by diaryl selenide: a theoretical investigation of the reaction mechanism.
Front Chem
December 2024
Department of Chemistry, Cleveland State University, Cleveland, OH, United States.
Quenching peroxynitrite (a reactive oxidant species) is a vital process in biological systems and environmental chemistry as it maintains redox balance and mitigates damaging effects in living cells and the environment. In this study, we report a systematic analysis of the mechanism of transforming peroxynitrite into nitrate using diaryl selenide in water. Through quantum mechanical calculations, we investigate the dynamic isomerization of peroxynitrite in a homogeneous catalytic environment.
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