Preparing Modified Silica Coated Magnetite Nanoparticles by co-precipitation Method and the Application in Removal of Iodine from Water Samples

Preparing Modified Silica Coated Magnetite Nanoparticles by co-precipitation Method and the Application in Removal of Iodine from Water Samples

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A new modified, nanometer-sized silica magnetic sorbent has been prepared by co-precipitation method. The size of crystallite around 27 nm was obtained from the XRD pattern according to Scherrer equation.

By being loaded their surface with 3-chloropropyltrimethoxysilane (CPTS) and imidazole, the modified nanoparticles are highly monodisperse and magnetically separable and have high adsorptive capacities. The nanoparticles can rapidly and quantitatively adsorb iodine from water solutions.

The factors, such as contact time, pH, amount of adsorbent, and temperature, are investigated in this paper. The optimum pH for iodine removal was 7.0-8.0 while no sorption was detected in acidic media (pH<5) due to the protonation of the functional groups. The adsorption reached a maximum of about 98 % with 50 mg adsorbent.

Original article citation

Tayyebeh Madrakian, Abbas Afkhami, Mohammad Ali Zolfigol, Mazaher Ahmadi and Nadia Koukabi. “Application of modified silica coated magnetite nanoparticles for removal of iodine from water samples”, Nano-Micro Lett. 4(1), 57-63 (2012). http://dx.doi.org/10.1007/BF03353693

A Highlight from Yu-Xing Yang for NMSTR.

 

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