Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
J Hazard Mater. 2010 Jul 15;179(1-3):424-30. doi: 10.1016/j.jhazmat.2010.03.021. Epub 2010 Mar 12.
A novel Al-Ce hybrid adsorbent with high sorption capacity for fluoride was prepared through the coprecipitation method in this study, and its preparation conditions were optimized. X-ray diffraction (XRD) and scanning electron microscope (SEM) results showed that the hybrid adsorbent was of amorphous structure and constituted by some aggregated nanoparticles. As the adsorbent had the zero point of zeta potential at pH 9.6, it was very effective in fluoride removal from aqueous solution via electrostatic interaction. The results of sorption experiments including sorption kinetics, isotherms, and the effect of solution pH showed that the sorption of fluoride on the Al-Ce adsorbent was fast and pH-dependent. Especially, the adsorbent had high sorption capacity up to 27.5 mg g(-1) for fluoride at the equilibrium fluoride concentration of 1 mg L(-1), much higher than that of the conventional adsorbents. Fourier transform infrared (FTIR) analysis and zeta potential measurement showed that the hydroxyl groups and the protonated hydroxyl groups on the adsorbent surface were involved in the fluoride adsorption.
本研究采用共沉淀法制备了一种新型的 Al-Ce 混合吸附剂，用于去除水中的氟化物。通过 X 射线衍射（XRD）和扫描电子显微镜（SEM）结果表明，该混合吸附剂为无定形结构，由一些聚集的纳米颗粒组成。由于吸附剂的等电点在 pH 值为 9.6，因此通过静电相互作用可以有效地从水溶液中去除氟化物。吸附动力学、吸附等温线和溶液 pH 值影响的吸附实验结果表明，氟离子在 Al-Ce 吸附剂上的吸附是快速且依赖于 pH 值的。特别是，该吸附剂在平衡氟离子浓度为 1mg/L-1 时，对氟化物的吸附容量高达 27.5mg/g-1，远高于传统吸附剂。傅里叶变换红外（FTIR）分析和 zeta 电位测量表明，吸附剂表面的羟基和质子化羟基参与了氟化物的吸附。
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