Tailoring the electronic microenvironment of polymeric carbon nitride to accelerate reduction crystallization kinetics of uranium extraction from seawater

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125266 - 125266

Published: March 1, 2025

Language: Английский

Multivariate Covalent Organic Frameworks for High‐Performance Ammonia Nitrogen Separation: Structure‐Property‐Function Relationships

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Adsorption-based separation of cationic pollutants, typically ammonia nitrogen (NH4 +-N), from water holds great potential for environmental decontamination and resource recycling. However, NH4 + is more challenging to adsorb than other cations due its stable structure relatively large ionic radius. In this study, a "multivariate" synthetic strategy applied construct covalent channels through rational encoding sulfonic acid groups enhance adsorption investigate the structure-property-function relationships sulfonated organic frameworks (COFs). The optimal group density 50%, with an capacity 17.09 mg g-1 equilibrium time 5 min, far surpassing most adsorbents. crystallinity COFs significantly enhances both kinetics. Surface area hydrophilicity primarily increaseadsorption capacity, minimal influence on contrast, pore size correlates negatively but facilitates N K-edge near-edge X-ray absorption fine spectroscopy validates atomic-level mechanisms ion exchange between Na+ at -SO3Na site formation hydrogen bonds (N─H─N N─H─O) H pyrrolic as well O carbonyl COFs. This study provides directions designing ultrafast high-capacity adsorbents cation capture.

Language: Английский

One-Step Precipitation and Coordination Mechanism for Highly Efficient Fe-Cu Separation in Acidic Wastewater

Published: Jan. 1, 2025

Language: Английский