Abstract
An inorganic/organic magnetic nanocomposite was synthesized and analytically characterized using X-ray fluorescence, X-ray diffraction, transmission electron microscopy and thermal analysis. The evaluation of the magnetic properties revealed that both the magnetite and the magnetite/chitosan nanocomposite are superparamagnetic with a paramagnetic component, having the saturation magnetization values of 48.04 emu/g, and 41.3 emu/g, respectively. The synthesized material is indented for the adsorption of two known commercial-available pesticides (active ingredients deltamethrin and thiamethoxam, respectively) from aqueous solutions.
Highlights
Synthesis and characterization of the adsorbent materialThe adsorption studies were mainly focused on the development and application of new adsorbents, the most promising materials being the activated carbon [8] (used for the removal of a series of herbicides), carbon nanotubes [9] (used for the adsorption of fenuron pesticide) or natural polymers, such as cyclodextrin [10] or chitosan [11]
The existence of clean water sources is a major concern worldwide
As the magnetic character of the adsorbent is of great importance for the easy removal from aqueous solutions, magnetization versus magnetic field strength were performed on a Lake Shore’s fully integrated Vibrating Sample Magnetometer system 7404 at room temperature, using nitrogen gas, in variable magnetic field [0 - 21,700] Oe, resolution of magnetization: 0.1×10-6 emu; step control of applied magnetic field: 70 mOe; moment stability: ≥± 0.05% of full scale/day for fixed coil, constant field and temperature; resolution of magnetic field intensity: 3 ppm resolution; standard procedures for periodical calibration based on NIST standards (SRM 772a, SRM 762, SRM 2853) [15]
Summary
The adsorption studies were mainly focused on the development and application of new adsorbents, the most promising materials being the activated carbon [8] (used for the removal of a series of herbicides), carbon nanotubes [9] (used for the adsorption of fenuron pesticide) or natural polymers, such as cyclodextrin [10] or chitosan [11] Another approach for the development of the nextgeneration adsorbents is represented by the core-shell nanostructures, having as main advantage the possibility to be applied in industrial application, as well as their facile removal, after their utilization, by applying an external magnetic field. Similar composites were described by other authors as efficient adsorbents for Cr(VI) [17]
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