Nitrate Removal From Aqueous Solution Using Quartz Sand – Supported Zero Valent Iron Nano Particles

علوم و مهندسی آبیاری

Manouchehr Heidarpour¹  Jahangir Abedi-Koupai¹  Saloomeh Sepehri² 

[1] استاد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه صنعتی اصفهان;دکترا مهندسی آب دانشکده کشاورزی، دانشگاه صنعتی اصفهان;

关键词: nano zero valent iron;    quartz sand;    nitrate;    kinetic;    isotherm, thermodynamic;   

DOI  :  10.22055/jise.2015.11483

来源: DOAJ

【 摘 要 】

The aim of this study is the investigation of nitrate removal from aqueous solution using quartz sand – supported zero valent iron nano particles (Sa-Fe⁰). The synthesis of Sa-Fe⁰ 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-N₂) analysis. The SEM images revealed that nano zero valent iron particles (nZVI) immobilized on Sa-Fe⁰ 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-Fe⁰ have been studied. The adsorption capacity decreased with increasing the Sa-Fe⁰ 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-Fe⁰ 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-Fe⁰ for nitrate was 20.833                         .

【 授权许可】

Unknown