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首页> 外文期刊>Journal of Environmental Management >Equilibrium and kinetic studies of ferricyanide adsorption from aqueous solution by activated red mud
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Equilibrium and kinetic studies of ferricyanide adsorption from aqueous solution by activated red mud

机译：活化赤泥从水溶液中吸附铁氰化物的平衡和动力学研究

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摘要

In this study, activated red mud (ARM) was used as a new adsorbent for the removal of ferricyanide anions from aqueous solution. Based on the percentage of ferricyanide removal and ferricyanide adsorption capacity, optimum conditions were evaluated using the response surface method (RSM) and central composite design (CCD). In optimum conditions (pH = 5.6, adsorbent dosage of 2.59 g, ferricyanide concentration of 60 ppm and contact time of 60 min), the percentage of ferricyanide removal and ferricyanide adsorption capacity were obtained as 79.6% and 1.8 mg/g, respectively. The kinetics and equilibrium studies were evaluated by considering the effective parameters including pH and ferricyanide concentration. Kinetic studies were evaluated by kinetic models of pseudo first-order, pseudo-second-order (four different linearized forms), Elovich and intraparticle diffusion. The results of the kinetic study indicated that the mechanism of ferricyanide adsorption onto the ARM adsorbent is a chemisorption interaction by a fast ferricyanide adsorption onto ARM and subsequently the slow diffusion of ferricyanide ions into the ARM inner adsorption sites. The equilibrium studies showed that the adsorption process followed the Langmuir model in which ferricyanide adsorption onto ARM was homogeneous with monolayer adsorption. The results indicated that the activation process of red mud improved adsorbent efficiency and increased the adsorption capacity.
机译：在这项研究中，活化的赤泥（ARM）被用作从水溶液中去除铁氰化物阴离子的新型吸附剂。根据去除铁氰化物的百分比和铁氰化物的吸附能力，使用响应面法（RSM）和中心复合设计（CCD）评估了最佳条件。在最佳条件下（pH = 5.6，吸附剂剂量为2.59 g，铁氰化物浓度为60 ppm，接触时间为60分钟），铁氰化物去除率和铁氰化物吸附量分别为79.6％和1.8 mg / g。通过考虑有效参数（包括pH和铁氰化物浓度）评估动力学和平衡研究。通过伪一级，伪二级（四种不同的线性化形式），Elovich和粒子内扩散的动力学模型对动力学研究进行了评估。动力学研究的结果表明，铁氰化物吸附到ARM吸附剂上的机理是快速的铁氰化物吸附到ARM上，随后铁氰化物离子缓慢扩散到ARM内部吸附位的化学吸附作用。平衡研究表明，吸附过程遵循Langmuir模型，其中氰化铁在ARM上的吸附与单层吸附是均匀的。结果表明，赤泥的活化过程提高了吸附效率，提高了吸附能力。

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