Magnetised nanocomposite mesoporous silica and its application for effective removal of methylene blue from aqueous solution

Shanmuga Kittappa, Saravanan Pichiah, Jung Rae Kim, Yeomin Yoon, Shane A. Snyder, Min Jang

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31 Scopus citations


Via a new synthetic route, magnetized nanocomposite mesoporous material (MNCM) was prepared using silica (SiO2) and nano-magnetite (Fe3O4). The formation mechanism of MNCM was determined using various spectroscopic analyses. Among the synthesized materials, MNCM-1, prepared with a molecular weight ratio of Fe3O4 to SiO2 of 0.14:1, had a homogeneous mesopore structure with a mean pore size of 4.68 nm, specific surface area of 576 m2 g-1, and a pore volume of 0.65 cm3 g-1. MNCM-1 had magnetic properties (2.9 emu) and structural strength, as well as higher and faster adsorptive MB removal than other mesoporous materials. The removal of MB by MNCM-1 was found to be a physisorption process with an electrostatic interaction between negatively charged silanol (Si-O-) and positively charged MB, and was thermodynamically favorable at higher temperatures. The economic assessment revealed that treatment costs for MB-containing water using MNCM-1 were 16-80 times lower than those with other mesoporous materials, due to the use of the cheap Si precursor and the higher sorption capacity. Furthermore, MNCM-1 can be reused and regenerated without any defects after easy separation using a magnet. Because MNCM-1 can be produced economically on a large scale, it may have significant effects for adsorption-based treatment systems with regard to the removal of MB from waste water.

Original languageEnglish
Pages (from-to)67-75
Number of pages9
JournalSeparation and Purification Technology
StatePublished - 16 Oct 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.


  • Adsorption
  • Magnetite
  • Mesoporous
  • Nanocomposite
  • Reuse
  • Silica


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