Abstract In this study, the adsorption equilibrium and diffusivity parameters of p -nitrophenol were estimated for water containing different concentrations of secondary amides. Commercial powdered activated carbon was used as an adsorbent. The external mass transfer coefficient ( k f ), the surface diffusion coefficient ( D s ) and the standard free Gibbs energy were calculated for p -nitrophenol in the presence of different secondary amide concentrations. The analysis established that there are correlations between structural parameters of amides, on the one hand, and diffusion and thermodynamic parameters for p -nitrophenol adsorption process, on the other. It was noticed that voluminous hydrophobic amides decreased the adsorption capacity of p -nitrophenol on activated carbon. On the basis of the results obtained for external mass transfer coefficients, it is assumed that amides cause the reduction of adsorption capacity of p -nitrophenol onto activated carbon by concentrating at the solid/liquid interface.

中文翻译：

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酰胺作为低摩尔质量藻类有机物的模型系统。对硝基苯酚对活性炭吸附的影响

摘要 在本研究中，对含不同仲酰胺浓度的水，对硝基苯酚的吸附平衡和扩散参数进行了估算。商业粉末活性炭用作吸附剂。在不同仲酰胺浓度存在下，计算了对硝基苯酚的外部传质系数 (kf)、表面扩散系数 (Ds) 和标准游离吉布斯能。分析表明，一方面酰胺的结构参数与对硝基苯酚吸附过程的扩散和热力学参数之间存在相关性。注意到大量疏水酰胺降低了对硝基苯酚在活性炭上的吸附能力。