Using shell-tunable mesoporous Fe3O4@HMS and magnetic separation to remove DDT from aqueous media

Hua Tian, Jinjun Li, Qun Shen, Hailin Wang, Zhengping Hao, Linda Zou, Qin Hu

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane (DDT) is of concern in water treatment because of its persistence and health effects. A new concept is proposed to synthesize hexagonal mesoporous silica (HMS) with magnetic functionalization for DDT removal from aqueous media. Fe3O4 nanocrystals were synthesized by a low-temperature solvothermal process, and then encapsulated in mesoporous silica through a packing approach, forming core-shell structured Fe3O4@HMS microspheres. The synthesized materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen adsorption-desorption techniques. The results indicate that the silica shell conserves mesoporous structure after the removal of surfactant templates. Different from previous studies, the thickness, pore volume and surface area of silica shell can be controlled by adjusting the reaction condition. These Fe3O4@HMS materials show high adsorption capacity and fast adsorption rate for DDT. Because of the useful magnetic property and unique mesoporous structure, the synthesized materials provide a fast, convenient and highly efficient means to remove DDT from aqueous media. Crown

Original languageBritish English
Pages (from-to)459-464
Number of pages6
JournalJournal of Hazardous Materials
Volume171
Issue number1-3
DOIs
StatePublished - 15 Nov 2009

Keywords

  • DDT
  • HMS
  • Magnetic mesoporous silica
  • Magnetic separation

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