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研究了镁铝类水滑石对中性红的吸附及其作用机理,考察了时间、pH、温度、电解质浓度等因素对吸附作用的影响。结果表明,镁铝类水滑石对中性红的吸附动力学符合准二级动力学方程,热力学符合Langmuir吸附等温式。在实验范围内,吸附量随溶液pH的增大而增加,随温度的升高而降低,随电解质浓度的增加先增加后降低。吸附过程是放热、熵减小的自发过程。镁铝类水滑石对中性红的吸附缘于为类水滑石与中性红分子中π电子的较强静电吸引作用。
The adsorption of Mg-Al hydrotalcite on neutral red and its mechanism were studied. The effects of time, pH, temperature, electrolyte concentration and other factors on the adsorption were investigated. The results show that the adsorption kinetics of Mg-Al hydrotalcite on neutral red accords with quasi-second-order kinetic equation, and the thermodynamics accords with Langmuir adsorption isotherm. In the experimental range, the amount of adsorption increases with the increase of solution pH, decreases with the increase of temperature, increases first and then decreases with the increase of electrolyte concentration. Adsorption process is exothermic, entropy reduction spontaneous process. Magnesium aluminum hydrotalcite adsorption of neutral red due to hydrotalcite and neutral red π electrons in the strong electrostatic attraction.