مشخصات پژوهش

صفحه نخست /Fe3O4-TiO2/Chitosan magnetic ...
عنوان
Fe3O4-TiO2/Chitosan magnetic nanobiocomposite as a novel Cadmium adsorbent: Fabrication, thermophysical Characterization and Isotherms, Kinetics and thermodynamics Analysis
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Nanocomposite; Magnetic nanoparticles; Chitosan; Cadmium removal; Adsorption equilibrium data; Sorption kinetics; Thermodynamic parameters
چکیده
A new magnetic nanocomposite (MNC) was prepared by grafting 3-chloropropyltrimethoxysilane and melamine (CPMSi-Mel) onto the surface of Fe3O4@TiO2 nanoparticles. Then, nanocomposite of chloroacetyl-chitosan (CACS) and (Fe3O4@TiO2-CPMSi-Mel) was fabricated from coprecipitation of CACS on the (Fe3O4@TiO2-CPMSi-Mel) nanoparticles. The synthesized MNC was characterized by Fourier transform infrared spectroscopy, X-ray diffraction analysis, field emission scanning electron microscopy, transmission electron microscopy, CHN elemental analysis, thermogravimetric analysis, and vibrating sample magnetometer. The ability of MNC for removing heavy metal ion (Cd2+) from polluted water was studied, and the effects of different parameters on the adsorption characteristics were investigated. The adsorption equilibrium data were well explained by the Langmuir isotherm model. The sorption kinetics was tested with pseudo-first-order and pseudo-second-order reaction and the rate constants of kinetic models were calculated. Results indicate that Cd2+ uptake process followed the pseudo-second-order rate expression. Furthermore, thermodynamic studies specify that adsorption was spontaneous and endothermic. The adsorption mechanism onto MNC was controlled by electrostatic attraction between MNC and Cd2+. Excellent adsorption capacity with other advantages such as reusability, easy separation, and environment-friendly composition make them suitable adsorbents for removal of heavy metal ions from environmental and industrial wastes.
پژوهشگران علی صادقی کردخیلی (نفر اول)، حامد تشکریان (نفر دوم)، عبدالرضا ابری (نفر سوم)، محمود تاجبخش جدیدی (نفر چهارم)