| 高岭石,蒙脱石和针铁矿对泥炭腐殖酸的吸附和分离 |
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| 作者姓名： | S. GHOSH WANG Zhen-Yu S. KANG P. C. BHOWMIK B. S. XING |
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| 作者单位： | S. GHOSH,S. KANG,P. C. BHOWMIK(Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, MA 01003 USA);WANG Zhen-Yu(College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100 China);B. S. XING(Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, MA 01003 USA;College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100 China)
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| 基金项目： | *1supported by the Federal Hatch Program, USA (No.MAS 8532);the Cheung Kong Scholar Program, Ministry ofEducation of China;the CSREES, USDA National Research Initiative Competitive Grants Program, USA (No.2005-35107-15278). |
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| 摘 要： | Sorption of humic acid (HA) on mineral surfaces has a profound interest regarding the fate of hydrophobic organic contaminants (HOCs) and carbon sequestration in soils. The objective of our study is to determine the fractionation behavior of HA upon sorption on mineral surfaces with varying surface properties. HA was coated sequentially on kaolinite (1:1 clay), montmorillonite (2:1 clay), and goethite (iron oxide) for four times. The unadsorbed HA fractions were characterized by elemental analysis, diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and solid state 13C nuclear magnetic resonance spectroscopy (NMR). The mineral-HA complexes were characterized by DRIFT. Polarity index (N+O)/C] revealed higher polarity of the unadsorbed HA fractions after coating on kaolinite, reflecting that relatively higher polarity fractions of HA remain unadsorbed. Sorption of aliphatic alcohol fraction along with carbohydrate was prominent on kaolinite surface. DRIFT results of the unadsorbed HA fractions indicated more sorption of aliphatic moieties on both kaolinite and montmorillonite. DRIFT results of the unadsorbed HA fractions after sorption on kaolinite and goethite showed the sorption of the proteinaceous fractions of HA. The HA fractions obtained after coating on goethite showed significant sorption of carboxylic moieties. The results mentioned above comply reasonably well with the DRIFT spectra of the mineral-HA complexes. 13C NMR results showed higher sorption of anomeric C on kaolinite surface. Higher sorption of paraffinic fraction was observed on montmorillonite. NMR data inferred the sorption of carboxylic moieties on goethite surface. Overall, this study showed that aliphatic moieties of HA preferentially sorbed on kaolinite and montmorillonite, while carboxylic functional groups play a significant role in sorption of HA on goethite. The sorbed fractions of HA may modify the mineral surface properties, and thus, the interaction with organic contaminants.
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| 关 键 词： | 矿物质 表面物质 疏水性 污染 蒙脱石 高岭石 |
| 收稿时间： | 18 June 2008 |
Sorption and fractionation of a peat derived humic acid by kaolinite, montmorillonite, and goethite |
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| S. GHOSH,WANG Zhen-Yu,S. KANG,P. C. BHOWMIK,B. S. XING.Sorption and fractionation of a peat derived humic acid by kaolinite, montmorillonite, and goethite[J].Pedosphere,2009,19(1):21-30. |
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| Authors: | S GHOSH WANG Zhen-Yu S KANG P C BHOWMIK and B S XING |
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| Institution: | Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, MA 01003 (USA);College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100 (China);Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, MA 01003 (USA);Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, MA 01003 (USA);College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100 (China) |
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| Abstract: | Sorption of humic acid (HA) on mineral surfaces has a profound interest regarding the fate of hydrophobic organic contaminants (HOCs) and carbon sequestration in soils. The objective of our study is to determine the fractionation behavior of HA upon sorption on mineral surfaces with varying surface properties. HA was coated sequentially on kaolinite (1:1 clay), montmorillonite (2:1 clay), and goethite (iron oxide) for four times. The unadsorbed HA fractions were characterized by elemental analysis, diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and solid state 13C nuclear magnetic resonance spectroscopy (NMR). The mineral-HA complexes were characterized by DRIFT. Polarity index (N+O)/C] revealed higher polarity of the unadsorbed HA fractions after coating on kaolinite, reflecting that relatively higher polarity fractions of HA remain unadsorbed. Sorption of aiiphatic alcohol fraction along with carbohydrate was prominent on kaolinite surface. DRIFT results of the unadsorbed HA fractions indicated more sorption of aiiphatic moieties on both kaolinite and montmorillonite. DRIFT results of the unadsorbed HA fractions after sorption on kaolinite and goethite showed the sorption of the proteinaceous fractions of HA. The HA fractions obtained after coating on goethite showed significant sorption of carboxylic moieties. The results mentioned above comply reasonably well with the DRIFT spectra of the minerai-HA complexes. 13C NMR results showed higher sorption of anomeric C on kaolinite surface. Higher sorption of paraffinic fraction was observed on montmorillonite. NMR data inferred the sorption of carboxylic moieties on goethite surface. Overall, this study showed that aliphatic moieties of HA preferentially sorbed on kaolinite and montmorillonite, while carboxylic functional groups play a significant role in sorption of HA on goethite. The sorbed fractions of HA may modify the mineral surface properties, and thus, the interaction with organic contaminants. |
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| Keywords: | carboxylic group DRIFT hydrophobic NMR sequential coating |
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