title: Removal of methylene blue, a basic dye, from aqueous solutions using nano-zerovalent iron.
abstract: In this research, the preparation of nanoparticles of Fe(0) (nano-zerovalent iron, NZVI) as adsorbent is discussed and the capability of adsorbing methylene blue (MB) is studied. The morphology of the adsorbent was evaluated with transmission electron microscopy. Batch studies were performed to delineate the influence of various experimental parameters such as pH, adsorbent dosage, initial dye concentration, temperature and contact time. Optimum conditions for MB removal were found to be pH 9.5, adsorbent dosage of 0.5 g L(-1) and equilibrium time of 1 min. The experimental equilibrium data were adjusted by the adsorption isotherms from Langmuir and Freundlich models, and their equilibrium parameters were determined. The adsorption of MB dye by NZVI obeyed both the Freundlich and Langmuir isotherm. The adsorption capacity of NZVI for MB in terms of monolayer adsorption was 208.33 mg g(-1).
authors.affiliation: Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran E-mail: siminarabi1354@yahoo.com.
authors.forename: Simin
authors.initials: S
authors.lastname: Arabi
authors.affiliation: Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran E-mail: siminarabi1354@yahoo.com.
authors.forename: Mahmoud Reza
authors.initials: MR
authors.lastname: Sohrabi
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D008422:Materials Testing; D008751:Methylene Blue / Q000302:isolation & purification*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D019163:Reducing Agents / Q000737:chemistry; D012996:Solutions; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D019163:Reducing Agents; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D007501:Iron; D008751:Methylene Blue