title: Adsorption of methylene blue from aqueous solutions using water treatment sludge modified with sodium alginate as a low cost adsorbent.
abstract: In this research, aluminum-based drinking water treatment sludge is used as a starting material and immobilized by sodium alginate to develop low cost adsorbent for the removal of methylene blue (MB) from aqueous solutions. The studied variables included pH, adsorbent dose, initial MB concentration and contact time. Characteristics of the adsorbent were also studied using scanning electron microscopy and Fourier transform infrared spectroscopy (FTIR). It was revealed from kinetic tests that removal efﬁciency of MB was 88.5% under the optimum conditions of pH 8, initial MB concentration of 50 mg/L, contact time of 60 min, and adsorbent dose of 0.3 g/L. The oxygen functional groups such as -OH, C-O-C and C=O were found on the surface of developed adsorbent by FTIR. In addition, the adsorption data fitted well the Langmuir adsorption model with the maximum sorption capacity of 909.1 mg/g, and followed the pseudo-second-order kinetics. Findings of this study indicate that the prepared adsorbent is promising for further development of an effective and economical adsorbent material in the near future.
authors.affiliation: Department of Environmental Health Engineering, Students Research Center, Hamadan University of Medical Sciences, Hamadan, Iran and School of Public Health, Hamadan University of Medical Sciences, Shahid Fahmideh Avenue, P.O. Box 65175-417, Hamadan, Iran E-mail: mostafa.leili@gmail.com.
authors.forename: Hamid
authors.initials: H
authors.lastname: Poormand
authors.affiliation: Department of Environmental Health Engineering, Students Research Center, Hamadan University of Medical Sciences, Hamadan, Iran and School of Public Health, Hamadan University of Medical Sciences, Shahid Fahmideh Avenue, P.O. Box 65175-417, Hamadan, Iran E-mail: mostafa.leili@gmail.com.
authors.forename: Mostafa
authors.initials: M
authors.lastname: Leili
authors.affiliation: Young Researchers and Elite Club, Qom Branch, Islamic Azad University, Qom, Iran and Department of Chemical Engineering, Faculty of Chemistry, Bu-Ali Sina University, P.O. Box 6517838695, Hamadan, Iran.
authors.forename: Marzieh
authors.initials: M
authors.lastname: Khazaei
mesh_terms: D000327:Adsorption; D000464:Alginates; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D012722:Sewage; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000464:Alginates; D012722:Sewage; D012996:Solutions; D014874:Water Pollutants, Chemical; D008751:Methylene Blue