Removal of ammonia-nitrogen in wastewater using a novel poly ligand exchanger-Zn(II)-loaded chelating resin
| Autor: | Dewen He, Changhong Peng, Kanggen Zhou, Wei Chen, Quanzhou Chen, Yan Chen |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Scanning electron microscope Nitrogen Kinetics 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences Waste Disposal Fluid Adsorption Ammonia Spectroscopy Fourier Transform Infrared Fourier transform infrared spectroscopy 0105 earth and related environmental sciences Water Science and Technology Chelating Agents Chelating resin Ligand Chemistry Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Zinc Reagent Microscopy Electron Scanning 0210 nano-technology Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Water science and technology : a journal of the International Association on Water Pollution Research. 79(1) |
| ISSN: | 0273-1223 |
| Popis: | In this study, a novel poly ligand exchanger-Zn(II)-loaded resin was designed to effectively remove ammonia-nitrogen (NH3-N) from wastewater. The surface morphology and structure of the Zn-loaded resin were characterized using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FTIR), respectively. SEM shows the surfaces of the Zn(II)-loaded resin were rough and nonporous and EDS demonstrated that Zn2+ was loaded onto the resin successfully. In addition, the combination form of Zn(II) with NH3-N adsorption reagent was revealed by FTIR spectra; the complex could be R-N-R-O-Zn-O-R-N-R and R-N-R-(O-Zn)2. The kinetics and equilibrium of the NH3-N adsorption onto the Zn(II)-loaded resin has been investigated. The effects of pH, reaction time, and temperature on NH3-N removal from wastewater by Zn(II)-loaded resin were investigated, and the results showed that the maximum adsorption capacity reached 38.55 mg/g at pH 9.54 at 298 K in 240 min. The adsorption ability of the modified resin decreased with an increase in temperature. Moreover, the NH3-N adsorption followed a pseudo-second-order kinetic process. The kinetic data demonstrated that the adsorption process might be limited by a variety of mechanisms. The study can provide the scientific foundation for the extensive application of a novel poly ligand exchanger-Zn(II)-loaded resin to remove NH3-N from wastewater. |
| Databáze: | OpenAIRE |
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