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HYDRODYNAMIC EFFECTS ON THE OVERALL ADSORPTION RATE OF PHENOL ON ACTIVATED CARBON CLOTH THROUGH THE ADVECTION-DIFFUSION MODEL APPLICATION
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jiec.2020.10.003
E. García-Hernández , C.G. Aguilar-Madera , E.C. Herrera-Hernández , R. Ocampo-Pérez , E. Bailón-García , Farid B. Cortés

Abstract In this work, a mathematical formulation based on fundamental principles of momentum and mass transport with a kinetic adsorption model at the liquid-solid interface is proposed. This formulation was numerically solved and used for the interpretation of adsorption rate data of phenol onto an activated carbon cloth in a stirred tank adsorber under different agitation rates. The mathematical model solution was compared with the obtained by mathematical models that neglect the local velocity and concentration profiles in the solution; external mass transfer model (EMTM) and the first-order kinetic model (FOM). The results showed that under all studied stirring speeds (30-200 rpm) the proposed model was able to capture the dynamics of the concentration decay curves, while EMTM and FOM models were only able to interpret the data at high stirring speeds, indicating that velocity profiles play an important role during phenol adsorption. Particular “wake zones” were identified behind the mobile adsorbent, which importantly promotes the transport of solute toward the activated carbon cloth. As a result, it was found that convective transport is much more important than diffusive transport in the solution.

中文翻译:

通过平流-扩散模型应用对苯酚在活性炭布上的总吸附率的水动力影响

摘要 在这项工作中,提出了基于动量和传质基本原理的数学公式,并在液固界面建立了动力学吸附模型。该公式被数值求解并用于解释苯酚在不同搅拌速率下在搅拌罐吸附器中活性炭布上的吸附速率数据。将数学模型解与忽略溶液中局部速度和浓度分布的数学模型得到的结果进行比较;外部传质模型 (EMTM) 和一级动力学模型 (FOM)。结果表明,在所有研究的搅拌速度(30-200 rpm)下,所提出的模型能够捕捉浓度衰减曲线的动态,而 EMTM 和 FOM 模型只能在高搅拌速度下解释数据,表明速度分布在苯酚吸附过程中起着重要作用。在移动吸附剂后面确定了特定的“尾流区”,这重要地促进了溶质向活性炭布的传输。结果发现,在溶液中对流传输比扩散传输重要得多。
更新日期:2021-01-01
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