title: Using shell-tunable mesoporous Fe3O4@HMS and magnetic separation to remove DDT from aqueous media.
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. Fe(3)O(4) nanocrystals were synthesized by a low-temperature solvothermal process, and then encapsulated in mesoporous silica through a packing approach, forming core-shell structured Fe(3)O(4)@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 Fe(3)O(4)@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.
authors: Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors: Hua
authors: H
authors: Tian
authors: Jinjun
authors: J
authors: Li
authors: Qun
authors: Q
authors: Shen
authors: Hailin
authors: H
authors: Wang
authors: Zhengping
authors: Z
authors: Hao
authors: Linda
authors: L
authors: Zou
authors: Qin
authors: Q
authors: Hu
mesh_terms: D000327:Adsorption; D003634:DDT / Q000737:chemistry / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D008280:Magnetics; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles; D036103:Nanotechnology / Q000379:methods; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D012822:Silicon Dioxide; D003634:DDT