A new modified linear driving force model applied to activated carbon adsorption

WANG Haihong; LIU Yingshu; LI Ziyi; YANG Xiong

doi:10.3969/j.issn.0438-1157.2014.10.028

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A new modified linear driving force model applied to activated carbon adsorption

更新时间：2025-12-10

- A new modified linear driving force model applied to activated carbon adsorption
- CIESC Journal Issue 10, Pages: 3953-3959(2014)
- 作者机构：
  
  1. 北京科技大学机械工程学院,北京,100083
  2. 北京科技大学北京高校节能与环保工程研究中心,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.10.028
  CLC： Q028.1
- Online First：05 October 2014，
  
  Published：05 October 2014
- 稿件说明：
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WANG Haihong, LIU Yingshu, LI Ziyi, et al. A new modified linear driving force model applied to activated carbon adsorption[J]. CIESC Journal, 2014, (10): 3953-3959.
DOI：

WANG Haihong, LIU Yingshu, LI Ziyi, et al. A new modified linear driving force model applied to activated carbon adsorption[J]. CIESC Journal, 2014, (10): 3953-3959. DOI： 10.3969/j.issn.0438-1157.2014.10.028.

摘要

以固相表面扩散模型为基础，研究了活性炭在不同吸附质浓度下单颗粒的吸附速率与吸附量之间的关系，以及颗粒内浓度分布随时间的变化过程。结合文献对LDF模型的假设，认为吸附初期对吸附剂颗粒内浓度分布做抛物线假设误差较大，吸附初期颗粒表面浓度分布梯度偏低，使得吸附速率降低，并提出了改进后的LDF模型，最后结合固相表面扩散模型和活性炭颗粒吸附SO2固定床穿透实验曲线进行了验证。结果表明，采用改进后的LDF模型作为推动力方程的穿透曲线模型能够更加准确地描述实验过程。本文的研究结果能够为活性炭吸附过程提供理论依据和模型参考。

Abstract

The relationship between adsorption rate and adsorbate quantity of a single particle

and the adsorbate concentration distribution changing with time inside the particle were studied based on the solid surface diffusion model. Referring to the assumption of LDF in literature

it was found that assuming a parabola distribution of adsorbate concentration inside the particle at the initial time was not suitable

because it caused a lower gradient of particle concentration distribution on the particle surface

and also a lower adsorption rate. A new improved LDF model was put forward

and was verified through the experimental curves of SO2 adsorption on activated carbon. The modified LDF model was more accurate in predictng the breakthrough curves compared with the LDF model.

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