The various factors affecting the removal of fluorescein dye using sawdust from aqueous solutions such as time, initial concentration, pH, and temperature were studied. The optimal conditions for removing the FD are 1 g of sawdust at pH 3 and 120 min time of contact. Dye removal dropped from 93.42% to 80.04% with natural pine sawdust (NPS) and from 96.83% to 81.51% with synthetic pine sawdust (SPS) by increasing their concentration from 2 to 10 mg/L. Isotherm, kinetic, and thermodynamic models were applied for determining their constants. The results indicated that the FD removal equilibrium was effectively defined by the Langmuir, Freundlich, and Temkin models. Kinetic studies showed that the pseudo-second order was well suited for dye removal, and the internal diffusion process was by two steps. The thermodynamic parameter values suggested that FD removal were physical adsorption, exothermic, lower randomness, and spontaneous.

中文翻译：

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使用天然和化学处理的松木屑去除水溶液中的荧光素染料

研究了使用锯末从水溶液中去除荧光素染料的各种因素，例如时间，初始浓度，pH和温度。去除FD的最佳条件是pH值为3的木屑1克，接触时间为120分钟。通过将天然松木屑（NPS）的浓度从2 mg / L增加到10 mg / L，染料去除率从93.42％降至80.04％，从合成松木屑（SPS）的染料去除率从96.83％降至81.51％。用等温线，动力学和热力学模型确定其常数。结果表明，Langmuir，Freundlich和Temkin模型有效地定义了FD去除平衡。动力学研究表明，伪二级非常适合去除染料，内部扩散过程分为两个步骤。