Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States.
Bioresour Technol. 2013 Feb;130:457-62. doi: 10.1016/j.biortech.2012.11.132. Epub 2012 Dec 8.
A magnetic biochar based adsorbent with colloidal or nanosized γ-Fe(2)O(3) particles embedded in porous biochar matrix was fabricated via thermal pyrolysis of FeCl(3) treated biomass. The synthesized samples were studied systematically by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, selected-area electron diffraction pattern, scanning electron microscopy, energy-dispersive X-ray analysis, superconducting quantum interference device, and batch sorption measurements. The characterization analyses showed that large quantity of γ-Fe(2)O(3) particles with size between hundreds of nanometers and several micrometers tightly grow within the porous biochar matrix. Biochar/γ-Fe(2)O(3) composite exhibited excellent ferromagnetic property with a saturation magnetization of 69.2emu/g. Batch sorption experimental results showed that the composite has strong sorption ability to aqueous arsenic. Because of its excellent ferromagnetic properties, the arsenic-laden biochar/γ-Fe(2)O(3) composite could be easily separated from the solution by a magnet at the end of the sorption experiment.
一种磁性生物炭基吸附剂，其胶体或纳米级 γ-Fe(2)O(3)颗粒嵌入多孔生物炭基质中，通过 FeCl(3)处理的生物质的热解制备而成。通过 X 射线衍射、X 射线光电子能谱、透射电子显微镜、选区电子衍射图、扫描电子显微镜、能量色散 X 射线分析、超导量子干涉装置和批量吸附测量对合成的样品进行了系统研究。特征分析表明，大量尺寸在几百纳米到几微米之间的 γ-Fe(2)O(3)颗粒紧密生长在多孔生物炭基质内。生物炭/γ-Fe(2)O(3)复合材料具有优异的铁磁性，饱和磁化强度为 69.2emu/g。批量吸附实验结果表明，该复合材料对水溶液中的砷具有很强的吸附能力。由于其优异的铁磁性，在吸附实验结束时，含砷的生物炭/γ-Fe(2)O(3)复合材料可以很容易地通过磁铁从溶液中分离出来。
