State Engineering Research Center of Engineering Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
J Hazard Mater. 2011 Oct 15;193:10-6. doi: 10.1016/j.jhazmat.2011.04.093. Epub 2011 May 6.
Magnetic wheat straw (MWS) with different Fe(3)O(4) content was synthesized by using in-situ co-precipitation method. It was characterized by powder X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). This material can be used for arsenic adsorption from water, and can be easily separated by applied magnetic field. The introduction of wheat straw template highly enhanced the arsenic adsorption of Fe(3)O(4). Among three adsorption isotherm models examined, the data fitted Langmuir model better. Fe(3)O(4) content and initial pH value influenced its adsorption behavior. Higher Fe(3)O(4) content corresponded to a higher adsorption capacity. In the pH range of 3-11, As(V) adsorption was decreased with increasing of pH; As(III) adsorption had the highest capacity at pH 7-9. Moreover, by using 0.1 mol L(-1) NaOH aqueous solution, it could be regenerated. This work provided an efficient way for making use of agricultural waste.
采用原位共沉淀法合成了不同 Fe(3)O(4)含量的磁性麦秸（MWS）。采用粉末 X 射线衍射（XRD）和振动样品磁强计（VSM）对其进行了表征。该材料可用于从水中吸附砷，并且可以通过施加磁场轻松分离。麦秸模板的引入极大地增强了 Fe(3)O(4 的砷吸附能力。在所考察的三种吸附等温线模型中，数据更符合 Langmuir 模型。Fe(3)O(4 含量和初始 pH 值影响其吸附行为。较高的 Fe(3)O(4 含量对应较高的吸附容量。在 pH 3-11 的范围内，随着 pH 值的升高，As(V)的吸附减少；在 pH 7-9 时，As(III)的吸附容量最高。此外，它可以使用 0.1 mol L(-1)的 NaOH 水溶液进行再生。这项工作为利用农业废弃物提供了一种有效的方法。
