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重金属和有机污染物在修饰土中的吸附
引用本文:MENG Zhao-Fu,ZHANG Yi-Ping,WANG Guo-Dong. 重金属和有机污染物在修饰土中的吸附[J]. 土壤圈, 2007, 17(2): 235-245. DOI: 10.1016/S1002-0160(07)60030-7
作者姓名:MENG Zhao-Fu  ZHANG Yi-Ping  WANG Guo-Dong
作者单位:[1]College of Life Science, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 (China). [2]College of Natural Resources and the Environment, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 (China)
摘    要:Sorption characteristics of both an organic pollutant (phenol) and a heavy metal (cadmium ion) on the clay layer of a Lou soil (Eum-orthic Anthrosol in Chinese Soil Taxonomy) along with the sorption mechanism were investigated using three soil treatments: modification with a cationic surfactant cetyltrimethylammonium bromide added at an amount equivalent to 50% and 100% of the soil CEC (50? and 100?), modification with an amphoteric surface-modifying agent dodecyldimethylbetaine (commercially known as BS-12) added at an amount equivalent to 50% and 100% of the soil CEC (50% BS and 100%BS), and an unmodified control (CK). Results showed that the BS soil treatments increased sorption of both the heavy metal Cd^2+ and the organic pollutant phenol. The equilibrium sorption amount of Cd^2+ decreased in the order: 50%BS 〉 100%BS 〉 CK 〉 50? 〉 100?, with the BS soil treatments being about 1.3 to 1.8 times higher and the CB soil treatments about 23% to 41% lower than CK. Both the single-site and two-site Langmuir models could be applied to describe the sorption of Cd^2+ in each soil treatment. The equilibrium sorption amount of phenol on the soil samples decreased in the order: 100? 〉 50? 〉 100%BS 〉 50%BS 〉 CK, with the CB soil treatments being 41.0 to 79.6 times higher and the BS soil treatments 4.0 to 8.3 times higher than CK. The Freundlich equation could also be used to describe the sorption characteristics of phenol. In the BS soil treatments, both an organophobic long carbon chain and hydrophilic charged groups resulted in a relatively strong sorption ability for both heavy metals and organic pollutants. In addition, the sorption ratio K, the ratio of phenol sorption amount of the modified soil to that of CK, increased initially and decreased later with the amount of phenol added, and the critical sorption ratio Kc, the peak value of the sorption ratio curve plotted against the added phenol concentration, was a good index for evaluating the sorption ability of phenol in the soil.

关 键 词:土壤污染 重金属 有机污染物 吸附作用
收稿时间:2006-07-26
修稿时间:2006-11-22

Sorption of heavy metal and organic pollutants on modified soils
MENG Zhao-Fu,ZHANG Yi-Ping and WANG Guo-Dong. Sorption of heavy metal and organic pollutants on modified soils[J]. Pedosphere, 2007, 17(2): 235-245. DOI: 10.1016/S1002-0160(07)60030-7
Authors:MENG Zhao-Fu  ZHANG Yi-Ping  WANG Guo-Dong
Affiliation:College of Life Science, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 (China). E-mail: zfmeng@126.com;College of Natural Resources and the Environment, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 (China);College of Life Science, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 (China). E-mail: zfmeng@126.com
Abstract:Sorption characteristics of both an organic pollutant (phenol) and a heavy metal (cadmiumion) on the clay layer of a Lou soil (Eum-orthic Anthrosol in Chinese Soil Taxonomy) along with the sorption mechanism were investigated using three soil treatments: modification with a cationic surfactant cetyltrimethylammonium bromide added at an amount equivalent to 50% and 100% of the soil CEC (50% CB and 100%CB), modification with an amphoteric surface-modifying agent dodecyldimethylbetaine (commercially known as BS-12) added at an amount equivalent to 50% and 100% of the soil CEC (50%BS and 100%BS), and an unmodified control (CK). Results showed that the BS soil treatments increased sorption of both the heavy metal Cd2+ and the organic pollutant phenol. The equilibrium sorption amount of Cd2+ decreased in the order: 50%BS > 100%BS > CK > 50%CB > 100%CB, with the BS soil treatments being about 1.3 to 1.8 times higher and the CB soil treatments about 23% to 41% lower than CK. Both the single-site and two-site Langmuir models could be applied to describe the sorption of Cd2+ in each soil treatment. The equilibrium sorption amount of phenol on the soil samples decreased in the order: 100%CB > 50%CB > 100%BS > 50%BS > CK, with the CB soil treatments being 41.0 to 79.6 times higher and the BS soil treatments 4.0 to 8.3 times higher than CK. The Freundlich equation could also be used to describe the sorption characteristics of phenol. In the BS soil treatments, both an organophobic long carbon chain and hydrophilic charged groups resulted in a relatively strong sorption ability for both heavy metals and organic pollutants. In addition, the sorption ratio K, the ratio of phenol sorption amount of the modified soil to that of CK, increased initially and decreased later with the amount of phenol added, and the critical sorption ratio KC, the peak value of the sorption ratio curve plotted against the added phenol concentration, was a good index for evaluating the sorption ability of phenol in the soil.
Keywords:amphoteric surface modifying agent  cadmium ion  phenol  sorption characteristics  sorption ratio K
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