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Sorption Kinetics of Toluene in Humin under Two Different Levels of Relative Humidity

Yang-hsin Shih* and Shian-chee Wu

Graduate Institute of Environmental Engineering, National Taiwan University, No. 71, Chou Shan Road, Taipei 106, Taiwan R.O.C



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Fig. 1. (a) Surface and (b) cross-section of a broken edge of a humin disk observed by scanning electron microscopy (SEM).

 


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Fig. 2. Solid-state 13C nuclear magnetic resonance (NMR) spectrum of humin.

 


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Fig. 3. Experimental results (squares and circles) and model best fittings (solid lines) of toluene sorption and desorption at different temperatures: (a) sorption and desorption at 15°C for Disk A, (b) sorption and desorption at 25°C for Disk B, and (c) sorption desorption at 35°C for Disk C. A1 and A2 and B1 and B2, respectively, are the results of duplicated experiments only with different volatile organic compound (VOC) concentrations.

 


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Fig. 4. (Top graph) Plot of ln Kd versus 1/T (K-1) for toluene sorption, and (bottom graph) plot of ln Ds and ln Dd versus 1/T (K-1) for toluene sorption and desorption at temperatures ranging from 15 to 35°C.

 


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Fig. 5. Relative absorbance intensity of sorbed toluene on humin varying with time for sorption (solid symbols) and desorption (empty symbols) at 729 cm-1 by Fourier transform infrared (FTIR) under dry (diamond) and humid (triangle) conditions.

 





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
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