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| Sorption and sorption kinetics of nitrobenzene and sevin on activated carbon |
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Abstract Pore structure, surface property and chemical constitution of activated carbon were determined and analyzed. The sorption isotherms and kinetics of nitrobenzene and sevin on activated carbon were examined, respectively. The data demonstrate that Polanyi-Manes model and two-stape dynamics equation fit best with the highest regression coefficients (R2), implying that sorption may be a multi-process reaction with dominating dynamic of dispersion force. The sorption capacity and rate of sevin onto activated carbon are lower than those of nitrobenzene, and the difference between fast and slow sorption stage is more obvious, indicate that adsorbate molecular size and adsorbent pore structure significantly influence the adsorption. The effect of Na+ concentration on sorption is slight, possible due to little effect of medium ionic strength on dispersion force among moleculars.
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Received: 29 December 2009
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