title: [Performance and Mechanism of Ferric Tannate in the Removal of Inorganic Nitrogen from Wastewater].
abstract: A novel adsorbent material-ferric tannate was synthesized, and performances and mechanisms of NH4(+) -N, NO2(-) -N and NO3(-) -N were investigated via batch adsorption experiments. The results indicated that ferric tannate exhibited preferential adsorption for NH4(+) -N and NO2(-) -N. When the mass ratios of ferric tannate to NH4(+) -N and ferric tannate to NO2(-) -N were both 200, the removal efficiencies were both higher than 95%. The adsorption behaviors were analyzed with adsorption kinetic models, Langmuir and Freundlich isotherm adsorption models, and Weber-Morris equation. The results implied that NH4(+) -N and NO2(-) -N were adsorbed on the surface of ferric tannate in the forms of monolayer and multilayer, respectively. The pseudo-second order kinetic model was more suitable to describe the adsorption processes, and the external particle diffusion and surface adsorption played the key roles in the adsorption process. NH: -N could be combined with negative oxygen ions which distributed on the external surface of ferric tannate by the electrostatic interaction, whereas NO2(-) -N could be combined with ferric ions in ferric tannate by the electrostatic interaction and coordination. The present study provided scientific evidence for the application of ferric tannate as a potential adsorbent in the future.
authors.forename: Rui-na
authors.initials: RN
authors.lastname: Zhang
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Jun-xin
authors.initials: JX
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D004058:Diffusion; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D009584:Nitrogen / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D009584:Nitrogen; D013634:Tannins; D062065:Wastewater