Preparation of a Magnetic Chitosan Composite Adsorbent by Ammonia Fumigation

摘要

A magnetic chitosan (CS) composite material was synthesized successfully by a new procedure, ammonia fumigation, which is suitable for large-scale production. CS dissolved in an aqueous acetic acid solution was mixed with [Fe(SO_4)_2]~(2-) and [Fe(SO_4)_2]~- ions to obtain a light yellow precipitate, which was then exposed to ammonia vapor to prepare the composite adsorbent product. The microstructure of the composite was studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The results indicate that Fe_3O_4 particles 3–7 nm in size were formed in situ and were stabilized in the CS matrix. The composite adsorbent showed superparamagnetic properties with a saturation magnetization of about 11.0 emu/g. Moreover, the composite material displayed good adsorption of methyl orange and copper ions. VC 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40057.