期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 8, 页码 4373-4379出版社
AMER CHEMICAL SOC
DOI: 10.1021/am301031g
关键词
Zn-doped biomagnetite; nanoparticles; (3-mercaptopropyl)trimethoxysilane (MPTMS); superparamagnetic; mercury sorption; stability
资金
- Office of Groundwater and Soil Remediation, Office of Environmental Management, U.S. Department of Energy (DOE), Applied Field Research Initiative (AFRI) Program at Oak Ridge National Laboratory (ORNL)
- Oak Ridge National Laboratory's Shared Research Equipment (ShaRE) User Program
- Office of Basic Energy Sciences, U.S. DOE
- DOE [DE-AC05-00OR22725]
The surfaces of Zn-doped biomagnetite nanostructured particles were functionalized with (3-mercaptopropyl)trimethoxysilane (MPTMS) and used as a high-capacity and collectable adsorbent for the removal of Hg(II) from water. Fourier transform infrared spectroscopy (FTIR) confirmed the attachment of MPTMS on the particle surface. The crystallite size of the Zn-doped biomagnetite was similar to 17 nm, and the thickness of the MPTMS coating was similar to 5 nm. Scanning transmission electron microscopy and dynamic light scattering analyses revealed that the particles formed aggregates in aqueous solution with an average hydrodynamic size of 826 +/- 32 nm. Elemental analyses indicate, that the chemical composition of the biomagnetite is Zn0.46Fe2.54O4, and the loading of sulfur is 3.6 mmol/g. The MPTMS-modified biomagnetite has a calculated saturation magnetization of 37.9 emu/g and can be separated from water within a minute using a magnet. Sorption of Hg(II) to the nanostructured particles was much faster than other commercial sorbents, and the Ho) sorption isotherm in an industrial wastewater follows the Langmuir model with a maximum capacity of similar to 416 rng/g, indicating, two SH groups bonded to one Hg. This new Hg(II) sorbent was stable in a range of solutions, from contaminated water to 0.5 M acid solutions, with low leaching of Fe, Zn, Si, and S (<10%).
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