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Synthesis of Ni/Al layered double hydroxides (LDHs) for adsorption of malachite green and direct yellow dyes from solutions: Kinetic and thermodynamic

机译:用于吸附孔雀石绿色的Ni / Al层层双氢氧化物(LDHS)的合成:动力学和热力学

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Ni/Al layered double hydroxides (LDHs) was synthesized by co-precipitation method at constant pH and characterized using XRD and FTIR analyses. Ni/Al LDHs was applied as adsorbent to removal malachite green and direct yellow in aqueous solution. The results show direct yellow more effective adsorbed than malachite green because LDHs has positive charges. Kinetics study showed that the adsorption process is more fits with PSO than PFO based on correlation coefficients. The adsorption process is describe by Freundlich isotherm models for all dyes. The value of enthalphy and entrophy shows that the adsorption process was endothermic and negative free energy value was indicated that the process was spontaneous.
机译:通过共沉淀法在恒定pH下合成Ni / Al层叠双氢氧化物(LDH),并使用XRD和FTIR分析表征。将Ni / Al LDHS作为吸附剂施加,以除去孔雀石绿色并直接黄色在水溶液中。结果显示直接黄色吸附比孔雀石绿色更有效,因为LDH有阳性电荷。动力学研究表明,基于相关系数,吸附过程比PFO更符合PFO。吸附过程由Freundlich等温线模型用于所有染料。焓和熵的值表明,吸附过程是吸热的,并且表明该过程是自发的。

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