Preparation and characterization of ZSM5-supported nano-zero-valent iron and its potential application in nitrate remediation from aqueous solution
| Autor: | Zahra Ramezani, M. Shekarriz, F. Elhami |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
021110 strategic
defence & security studies Zerovalent iron Environmental Engineering Aqueous solution Chemistry Precipitation (chemistry) Inorganic chemistry 0211 other engineering and technologies Langmuir adsorption model 02 engineering and technology 010501 environmental sciences 01 natural sciences Fourier transform spectroscopy symbols.namesake chemistry.chemical_compound Adsorption Nitrate symbols Environmental Chemistry General Agricultural and Biological Sciences Zeolite 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Environmental Science and Technology. 14:1081-1090 |
| ISSN: | 1735-2630 1735-1472 |
| Popis: | Zeolite Socony Mobil-5 (ZSM5)-supported nano-zero-valent iron (NZVI@ZSM5) was synthesized using homogenous precipitation method. The prepared particles were characterized by transmission electron microscope (TEM), field emission scanning electron microscope (FESEM), atomic force microscope, X-ray diffraction spectroscopy and Brunauer–Emmett–Teller as well as Fourier transform spectroscopy. The TEM image confirms the formation of NZVI particles with average size of 15 nm within ZSM5 pores. Moreover, the ability of the NZVI@ZSM5 in nitrate removal from industrial wastewaters was tested. The effects of different parameters such as solution pH, NZVI@ZSM5-nitrate solution contact time, amounts of NZVI@ZSM5, initial nitrate concentration and nitrate solution volume on removal efficiency were investigated. More than 97% nitrate ion was removed at pH = 2.5, 30 min contact time, and 0.55 g NZVI@ZSM5 for 100 mL of 50 µg mL−1 nitrate. It was also shown that among the four fitted adsorption isotherms, Langmuir isotherm gives the best description of the adsorption process. Kinetic studies showed that nitrate removal using NZVI@ZSM5 obeys pseudo-second-order kinetics (R 2 = 0.9998). The present method was successfully applied to the removal of nitrate contents of different wastewater gathered from the different industries located in the Khuzestan province, Iran. The reduction in their nitrate contents was in the range of 94–99%. |
| Databáze: | OpenAIRE |
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