【摘要】 采用多种化合物插层蒙脱石,制备不同电动电位（ζ-电位）的蒙脱石,用于吸附水体中的直接大红染料,并研究蒙脱石的ζ-电位与吸附直接大红染液的性能关系.研究表明:蒙脱石的ζ-电位对吸附染料性能有显著的影响,Ni²⁺与邻菲罗啉生成的螯合物改性蒙脱石及聚合羟基铝离子改性蒙脱石对染料的吸附性较好,脱色率可达90%以上,且前者对染料的吸附性基本与pH值无关.动力学研究表明:聚合羟基铝离子改性蒙脱石吸附染料较快,液膜扩散是主要的控速步骤,可用准一级动力学描述;而Ni²⁺与邻菲罗啉生成的螯合物改性蒙脱石吸附染料较慢,粒内扩散限速作用大,更接近准二级动力学模型.热力学研究表明:聚合羟基铝离子改性蒙脱石和Ni²⁺与邻菲罗啉生成的螯合物改性蒙脱石的吸附过程分别适合于Langmuir模型和Freumdlich模型,两者的吸附能力均约为22mg·g^-1.更多还原

【Abstract】 Various compounds were used to alter montmorillonite,to prepare modified montmorillonites with different zeta-potentials（ζ-potential）as adsorbents for removal of the direct red dye from the aqueous solution.The impact of theζ-potential of montmorillonite on the adsorption capacity toward dye was investigated.The results showed that the values of ζ-potential have a prominent effect on its adsorptive affinity for dye.The modified montmorillonites,such as Al₁₃-M and Ni-phen-M,showed higher decoloring performance with the decolorization rate over 90%.The adsorption of dye on Ni-phen-M was pH value independent.Futhermore,the kinetics of the interactions for Al₁₃-M toward dye was best described by pseudo-first-order mechanism,but Ni-phen-M followed the pseudo-second-order model.It was also found that the rate-limiting step of Al₁₃-M was more likely to be liquid film diffusion as compared to Ni-phen-M,of which the rate-limiting step was intraparticle diffusion.Thermodynamic studies showed that the adsorption of Al₁₃-M and Ni-phen-M were well described by Langmuir and Freumdlich isotherm model,respectively.The adsorption capacity of both were about 22mg·g^-1.更多还原