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

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

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 (US)
Pages (from-to)67-75
Number of pages9
JournalSeparation and Purification Technology
Volume153
DOIs
StatePublished - Oct 16 2015

Keywords

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

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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