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通过研究等温吸附行为、动力学特征和pH值影响以及红外光谱、扫描电镜表征等对水浮莲干粉吸附活性艳红K-2BP、亚甲基蓝两种不同类型的离子型染料的机理进行探讨。结果表明:水浮莲干粉对亚甲基蓝的吸附符合Langmuir等温方程,而Freundlich等温方程更适合活性艳红K-2BP的吸附。Lagergren准二级动力学方程能很好地描述两种染料的吸附动力学行为。pH值是影响染料吸附的重要因素,酸性环境利于阴离子型染料活性艳红K-2BP的吸附,而碱性环境则利于阳离子型染料亚甲基蓝。表征结果显示:吸附前后样品基本没发生变化,可能主要为物理吸附。
By studying the isothermal adsorption behavior, kinetic characteristics and pH value, infrared spectroscopy and scanning electron microscopy (SEM), the adsorption mechanism of two types of ionic dyes, Reactive Red K-2BP and Methylene Blue, was discussed. The results showed that the adsorption of methylene blue by the floating lotus dry powder conformed to Langmuir isotherm equation, while the Freundlich isotherm was more suitable for the adsorption of reactive brilliant red K-2BP. Lagergren quasi-second order kinetic equation can well describe the adsorption kinetics of the two dyes. pH value is an important factor affecting the dye adsorption, acidic environment conducive to the anionic dye reactive brilliant red K-2BP adsorption, while the alkaline environment is conducive to the cationic dye methylene blue. Characterization results show that: the sample before and after adsorption did not change, probably mainly for physical adsorption.