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Sorption Stability and Mechanism Exploration of Palygorskite as Immobilization Agent for Cd in Polluted Soil
Han, Jun1,2,3,4; Xu, Yingming1; Liang, Xuefeng2; Xu, Yuanjian
2014-10-01
摘要Clay minerals have been utilized for the remediation of heavy metal-polluted soil. However, information on the remediation stability of various clay minerals with different performances is limited. In this study, a kind of palygorskite (PAL) with a sorption amount for Cd2+ about 40 mg/g, which is much larger than common minerals, was selected as amendment for in situ immobilization field demonstration. Besides, sorption stability which is essential for remediation was investigated in an ideal solid solution system by sorption and desorption behaviors of Cd2+ on PAL, including isotherms, kinetics, and various stimulated environmental factors such as pH, temperature, and background electrolytes. The calculated thermodynamic parameters confirmed the sorption process was endothermic and driven by entropy changes. Only minimal desorption was caused by stimulated irrigation or runoff and acid rain. The temperature, pH, and background electrolyte dependence confirmed that the sorption of Cd2+ on PAL was stable. Various characterization results including X-ray photoelectron spectroscopy (XPS), scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) mapping, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) confirmed the sorption mechanisms were surface precipitation of CdCO3 and surface complexation with hydroxyl groups.
关键词Palygorskite Immobilization agent Cadmium Sorption stability Soil remediation
DOI10.1007/s11270-014-2160-1
发表期刊WATER AIR AND SOIL POLLUTION
ISSN0049-6979
卷号225期号:10页码:13
通讯作者Xu, YJ (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Div Ecol & Environm Res Three Gorges, 266 Fangzheng Ave,Shuitu Hitech Ind Pk, Chongqing 400714, Peoples R China.
收录类别SCI
WOS记录号WOS:000342427000026
语种英语