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DOI	10.1021/jf048106r
	Sorption of 2,4,6-trichlorophenol in model humic acid-clay systems
	Wang, XP; Shan, XQ; Luo, L; Zhang, SZ; Wen, B
发表日期	2005
ISSN	0021-8561
EISSN	1520-5118
起始页码	3548
结束页码	3555
卷号	53 期号:9
英文摘要	Humic acids and clays are important soil components that influence the sorption and desorption of organic contaminants; however, it is unclear how humic acids influence the sorption of organic contaminants onto clays and their subsequent desorption. Sorption and desorption of 2,4,6-trichlorophenol (2,4,6-TCP) by and from humic acid-modified K+- and Ca2+-montmorillonite and -illite were compared with unmodified clays using batch equilibration methods. Commercial humic acid and the humic acid extracted from forest soil were employed in this experiment. The adsorbed amount of 2,4,6-TCP by commercial humic acid was almost twice as large as that adsorbed by the extracted soil humic acid. More 2,4,6-TCP was sorbed onto K+- and Ca2+-illite than onto K+- and Ca2+- montmorillonite. K+ clays were more effective in adsorbing 2,4,6-TCP than Ca2+ clays. Sorption of 2,4,6-TCP on humic acid-modified Ca2+- and K+-montmorillonite and -illite increased as compared with unmodified clays. The sorption nonlinearity of 2,4,6-TCP on humic acid-modified Ca2+- and K+-illite increased remarkably as compared with the unmodified clays. The sorption nonlinearity of 2,4,6-TCP on humic acid-modified Ca2+- and K+-montmorillonite increased slightly in contrast to unmodified montmorillonites. By comparing sorption and desorption results, we observed hysteresis for all sorbents including humic acids, clays, and humic acid-modified clays. Sorption nonlinearity and hysteresis were dependent on the structure of humic acids. Higher aromaticity of humic acids resulted in greater sorption nonlinearity and desorption hysteresis. In addition, sorption capacity (K-f(')) was positively correlated with the humic acid content of the sorbents. These results show that modification of humic acids on clays can not only increase the adsorption ability of clays but also affect the sorption nonlinearity of 2,4,6-TCP, and the desorption hysteresis was probably due to the structural characteristics of humic acids.
关键词	SOIL ORGANIC-MATTER DESORPTION ADSORPTION ATRAZINE POLLUTANTS EQUILIBRIA PARTITION CHEMICALS MECHANISM SURFACE
英文关键词	sorption and desorption; 2,4,6-trichlorophenol; humic acid-modified montmorillonite and illite
语种	英语
WOS研究方向	Agriculture ; Chemistry ; Food Science & Technology
WOS类目	Agriculture, Multidisciplinary ; Chemistry, Applied ; Food Science & Technology
WOS记录号	WOS:000228810200043
来源期刊	JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257370
推荐引用方式 GB/T 7714	Wang, XP,Shan, XQ,Luo, L,et al. Sorption of 2,4,6-trichlorophenol in model humic acid-clay systems[J]. 中国科学院青藏高原研究所,2005,53(9).
APA	Wang, XP,Shan, XQ,Luo, L,Zhang, SZ,&Wen, B.(2005).Sorption of 2,4,6-trichlorophenol in model humic acid-clay systems.JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY,53(9).
MLA	Wang, XP,et al."Sorption of 2,4,6-trichlorophenol in model humic acid-clay systems".JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 53.9(2005).