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Sorption of 2,4,6-trichlorophenol in model humic acid-clay systems
Wang, XP; Shan, XQ; Luo, L; Zhang, SZ; Wen, B
2005
Source PublicationJOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume53Issue:9Pages:3548-3555
AbstractHumic 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.
Department环境化学与生态毒理学国家重点实验室
KeywordSorption And deSorption Humic Acid-modified Montmorillonite And Illite 2 4 6-trichlorophenol
DOI10.1021/jf048106r
WOS Research AreaAgriculture ; Chemistry ; Food Science & Technology
WOS IDWOS:000228810200043
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/23234
Collection环境化学与生态毒理学国家重点实验室
Recommended Citation
GB/T 7714
Wang, XP,Shan, XQ,Luo, L,et al. Sorption of 2,4,6-trichlorophenol in model humic acid-clay systems[J]. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY,2005,53(9):3548-3555.
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),3548-3555.
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):3548-3555.
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