School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
J Hazard Mater. 2011 Feb 28;186(2-3):1118-23. doi: 10.1016/j.jhazmat.2010.11.110. Epub 2010 Dec 3.
The iron-pillared bentonite (Fe-Ben) was prepared by ion-exchange using the natural bentonite (GZ-Ben) from Gaozhou, China, at room temperature without calcination. Both Fe-Ben and GZ-Ben were characterized by X-ray diffraction, N(2) adsorption and Fourier transform infrared spectroscopy. The results show that the d(001) value and surface area of the bentonite material increased after iron pillaring. Fe-Ben adsorbed much more Rhodamine B (RhB) than GZ-Ben, which can be ascribed to the special surface properties and large surface area of Fe-Ben. The optimum pH value for the adsorption of RhB on Fe-Ben is 5.0. The adsorption of RhB onto Fe-Ben can be well described by the pseudo-second-order kinetic model and the intraparticle diffusion kinetic model. The adsorption isotherm of RhB onto Fe-Ben matches well with the Langmuir model.
铁柱撑膨润土（Fe-Ben）是通过室温下的离子交换作用，利用来自中国高州的天然膨润土（GZ-Ben）制备而成，无需煅烧。Fe-Ben 和 GZ-Ben 均通过 X 射线衍射、N2 吸附和傅里叶变换红外光谱进行了表征。结果表明，膨润土材料的 d(001) 值和表面积在铁柱撑后增加。Fe-Ben 吸附的 Rhodamine B（RhB）比 GZ-Ben 多得多，这归因于 Fe-Ben 的特殊表面性质和较大的表面积。Fe-Ben 吸附 RhB 的最佳 pH 值为 5.0。RhB 吸附到 Fe-Ben 上的过程可以很好地用伪二级动力学模型和内扩散动力学模型来描述。RhB 吸附到 Fe-Ben 上的吸附等温线与朗缪尔模型吻合良好。
