Nitrate Removal From Aqueous Solution Using Quartz Sand – Supported Zero Valent Iron Nano Particles
The aim of this study is the investigation of nitrate removal from aqueous solution using quartz sand – supported zero valent iron nano particles (Sa-Fe<sup>0</sup>). The synthesis of Sa-Fe<sup>0</sup> was based on the reduction of ferrous iron with borohydride, in which quar...
| Main Authors: | , , |
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| Format: | Article |
| Language: | fas |
| Published: |
Shahid Chamran University of Ahvaz
2015-11-01
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| Series: | علوم و مهندسی آبیاری |
| Subjects: | |
| Online Access: | http://jise.scu.ac.ir/article_11483_c001906eb05eb16a266a26dbf12ae273.pdf |
| Summary: | The aim of this study is the investigation of nitrate removal from aqueous solution using quartz sand – supported zero valent iron nano particles (Sa-Fe<sup>0</sup>). The synthesis of Sa-Fe<sup>0</sup> was based on the reduction of ferrous iron with borohydride, in which quartz sand acted as a porous-based support material. The structure of adsorbent was characterized by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Brunauer–Emmett–Teller (BET-N<sub>2</sub>) analysis. The SEM images revealed that nano zero valent iron particles (nZVI) immobilized on Sa-Fe<sup>0</sup> were spherical and clearly discrete and uniformly dispersed on the surface of the stabilizer without any obvious aggregation. In the batch mode adsorption studies, the effects of the contact time, initial nitrate concentration of solution, sorbent dosage,temperature and initial pH on the nitrate adsorption by the Sa-Fe<sup>0</sup> have been studied. The adsorption capacity decreased with increasing the Sa-Fe<sup>0</sup> dosage and initial pH value of the solution but increased with the increase in the temperature and initial concentration of nitrate. Removal of nitrate using Sa-Fe<sup>0</sup> was in accordance with the pseudo first order kinetic model. The initial phase with the rapid rise of the adsorption rate was about 8h and the removal efficincy in this time interval was about 85% for the initial nitrate concentrations of 100 mg/L. The equilibrium data fitted well to the Langmuir model. The maximum adsorption capacity of Sa-Fe<sup>0</sup> for nitrate was 20.833 . |
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| ISSN: | 2588-5952 2588-5960 |