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- Title
铁改性生物炭吸附初雨中氮磷的试验研究.
- Authors
何琨; 姜应和; 周龙; 韩旻沂; 金建华
- Abstract
Iron-loaded biochar (Fe-BC) was prepared to remove low concentration of nitrogen and phosphorus in initial rain⁃ water runoff, aiming to find an economical and efficient material to adsorb nitrogen and phosphorus. Fe-BC was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), energy spectrum (EDS) and X-ray diffraction (XRD), respectively, indicating that there is crystal structure and Fe-O functional groups. The adsorption mecha⁃ nism of nitrogen and phosphorus by Fe-BC was investigated by adsorption kinetics, isothermal adsorption and adsorption ther⁃ modynamics experiments. The results show that the binding mode of Fe-BC to nitrate is mainly the outer complex, and the ad⁃ sorption process fits well with the quasi-second-order kinetic model and Freundlich model. The adsorption is mainly sponta⁃ neous and entropy-increasing exothermic reaction, and the theoretical maximum adsorption capacity is 2.83~5.70 mg/g at dif⁃ ferent temperatures. The binding mode of Fe-BC to phosphate is mainly inner layer complex, and the adsorption process fits well with the quasi-second-order kinetic model and Temkin model. The adsorption is spontaneous and entropy-increasing en⁃ dothermic chemical reaction, and the theoretical maximum adsorption capacity is 1.78~2.19 mg/g at different temperatures.
- Subjects
FOURIER transform infrared spectroscopy; ADSORPTION kinetics; EXOTHERMIC reactions; ADSORPTION capacity; SCANNING electron microscopes; PHOSPHATE removal (Water purification); CRYSTALLIZATION kinetics
- Publication
Environmental Science & Technology (10036504), 2022, Vol 45, Issue 7, p78
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.0199.22.338