FTIR Spectroscopic Structural Characterization of Forest Topsoil Humic Substances and Their Adsorption and Desorption for Mercury
FTIR Spectroscopic Structural Characterization of Forest Topsoil Humic Substances and Their Adsorption and Desorption for Mercury
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DOI：
10.1097/ss.0000000000000001
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
Yiru Zhang;T. Xue;Ren-qing Wang;J. Dai
中科院分区：
文献类型：
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作者：
Yiru Zhang;T. Xue;Ren-qing Wang;J. Dai
摘要通过一系列批量实验，研究了从山东泰山、崂山和方干三种暗棕壤中提取的六种腐植酸(三种胡敏酸和三种黄腐酸)对二价汞(Hg(II))的吸附和解吸特性，中国。结果表明，吸附等温线符合Langmuir方程和Freundlich方程。三种腐植酸的吸附强度和吸附容量均大于三种黄腐酸。三种HA的解吸率均小于2.6%，说明HA对Hg(II)具有较高的结合强度。由于HA对Hg(II)表现出较强的吸附强度和较低的解吸比，因此HA可能在土壤对Hg(II)的吸附/解吸过程中起重要作用。傅里叶变换红外光谱(FTIR)分析表明，6种HS均含有相同的官能团，HS对Hg(II)的吸附主要是离子交换和氢键形成的结果，氢键可能发生在HS的羰基(C=O)、羧基(CoO-)、羟基(O-H)和C-O上。
Abstract A series of batch experiments were conducted to determine the adsorption and desorption characteristics of divalent mercury (Hg(II)) by six humic substances (HS) (three humic acids (HA) and three fulvic acids) extracted from three dark brown forest soils from Mount Tai, Laoshan Mountain, and Fanggan in Shandong Province, China. It was found that Hg(II) adsorption isotherms could be well fitted with both Langmuir and Freundlich equations. The three HA had larger adsorption intensity and adsorptive capacity than those of the three fulvic acids. The desorbed percentages of the three HA were less than 2.6%, which suggests that HA had a high binding strength for Hg(II). As the HA showed stronger adsorptive intensity and lower desorption ratio for Hg(II), the HA might play an important role in the adsorption/desorption processes in soil for Hg(II). The Fourier transform infrared (FTIR) spectroscopy showed that the six HS contained the same function groups and that the adsorption of Hg(II) on HS was mostly a result of ion exchange and the formation of hydrogen bonds, which may take place on the carbonyls (C=O), carboxyls (COO-), hydroxyls (O-H), and C-O of the HS.