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使用乙二胺改性的木屑黄原酸盐对水溶液中的Cu(II)、Ni(II)离子进行吸附。在单离子体系中,考虑影响因素(温度、投加量)对Cu(II)、Ni(II)单离子吸附等温线的影响;并计算Cu(II)、Ni(II)离子吸附的热力学参数:吸附吉布斯自由能(?GΘ)、吸附过程的焓变(?HΘ)以及熵变(?SΘ),表明此吸附是一个放热自发的过程。在Cu(II)和Ni(II)双离子体系中,采用修正后的拓展Langmuir模型对体系的吸附情况可以进行很好的预测。在单离子体系和双离子体系中,吸附过程的数据均可通过准二级动力学模型进行描述;计算得到其对Cu(II)和Ni(II)单离子的吸附活化能分别为59.12和55.92 kJ/mol。结果表明,金属离子在改性木屑表面的吸附效果会受到另一离子存在的影响。
Adsorption of Cu (II) and Ni (II) ions in aqueous solution using ethylenediamine modified sawdust xanthate. In the single-ion system, the influence factors (temperature and dosage) on the single ion adsorption isotherm of Cu (II) and Ni (II) were considered. The thermodynamic parameters of Cu (II) and Ni : The adsorption Gibbs free energy (? GΘ), the enthalpy change (? HΘ) and entropy change (? SΘ) of the adsorption process indicate that the adsorption is a spontaneous exothermic process. In the Cu (II) and Ni (II) dual-ion systems, the modified extended Langmuir model can be used to predict the adsorption of the system. In the single ion system and the double ion system, the data of the adsorption process can be described by quasi-second-order kinetic model. The calculated activation energies of adsorption on Cu (II) and Ni (II) ions are 59.12 and 55.92 kJ / mol. The results show that the adsorption of metal ions on the surface of modified wood chips is affected by the existence of another ion.