期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 194, 期 -, 页码 156-161出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.07.093
关键词
Natural organic matter; Adsorption; Magnetic adsorbent; Surfactant; Water treatment
资金
- University of California Lead Campus for Nanotoxicology Training and Research
- University of California
- National Science Foundation (NSF)
- U.S. Environmental Protection Agency (USEPA) [EF 0830117]
- Direct For Biological Sciences
- Div Of Biological Infrastructure [0830117] Funding Source: National Science Foundation
To remove natural organic matter (NOM) from water, magnetic permanently confined micelle arrays (Mag-PCMAs) were synthesized by coating the surface of Fe(3)O(4) particles with a silica/surfactant mesostructured hybrid layer. An environmental scanning electron microscope (ESEM) was used to characterize the particle size and surface morphology of the Mag-PCMAs. The zeta potential was used to assess the surface charge. Batch experiments were performed to investigate the adsorption of NOM by Mag-PCMAs. It was determined that NOM removal efficiency by Mag-PCMAs could be as high as 80% at a wide range of initial pH values (similar to 6.0-10.0). The adsorption isotherm was fitted well by a Langmuir model. Although Fe(3)O(4) had a high positive charge and Mag-PCMAs a small negative charge, Mag-PCMAs had a higher removal efficiency of NOM than uncoated Fe(3)O(4) particles (which are also magnetic), which indicated that the adsorption of NOM onto Mag-PCMAs was not dominated by electrostatic interactions. Possible mechanisms of the adsorption of NOM onto Mag-PCMAs were hydrophobic interactions and hydrogen bonding. It was feasible to reuse Mag-PCMAs after regeneration. These results indicate that Mag-PCMAs can be very attractive for the removal of NOM from aqueous matrices. (C) 2011 Elsevier B.V. All rights reserved.
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