活性炭纤维吸附石化废水中苯酚的吸附平衡及动力学

doi:10.11949/j.issn.0438-1157.20150056

化工学报 ›› 2015, Vol. 66 ›› Issue (12): 4874-4882.DOI: 10.11949/j.issn.0438-1157.20150056

活性炭纤维吸附石化废水中苯酚的吸附平衡及动力学

孔黎明¹, 张婷¹, 王佩德², 周祥¹, 贾哲华¹

1 扬州大学化学化工学院, 江苏扬州 225002;
2 扬州石化有限责任公司, 江苏扬州 225200

收稿日期:2015-01-14 修回日期:2015-07-18 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 孔黎明
基金资助:
国家自然科学基金项目(21106125);扬州市科技计划项目(2012038-7)。

Equilibrium and kinetics of phenol adsorption from petrochemical wastewater with activated carbon fiber

KONG Liming¹, ZHANG Ting¹, WANG Peide², ZHOU Xiang¹, JIA Zhehua¹

1 College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China;
2 Yangzhou Petrochemical Company Ltd., Yangzhou 225200, Jiangsu, China

Received:2015-01-14 Revised:2015-07-18 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by the National Natural Science Foundation of China (21106125) and the Science and Technology Plan Projects of Yangzhou (2012038-7).

摘要/Abstract

摘要：

以活性炭纤维(ACF)为吸附剂,研究了ACF对石化废水中苯酚的吸附平衡及动力学。在25、40、55及65℃下测定了吸附平衡等温线,采用Langmuir、Freundlich和Redlich-Peterson等温方程对吸附平衡数据进行了拟合,结果表明吸附平衡数据更符合Langmuir与Redlich-Peterson方程。体系温度从25、40、55升高到65℃时,ACF对模拟废水中苯酚的吸附能力随温度升高而降低,而ACF对石化废水中苯酚的吸附能力并不完全随温度升高而降低。ACF对石化废水与模拟废水中苯酚的吸附过程均符合拟二级动力学方程。颗粒内扩散模型对吸附动力学实验数据的拟合结果表明,吸附初期吸附速率主要受颗粒内扩散控制且石化废水中苯酚吸附的k_id随温度升高而增大,吸附中后期吸附速率除了受颗粒内扩散控制外还受到外扩散的影响。热力学分析表明,石化废水中ACF吸附苯酚过程的ΔG<0,由于石油类物质对苯酚吸附的影响,温度升高ΔG的数值变化不大。

关键词: 吸附, 活性炭纤维, 苯酚, 废水, 动力学

Abstract:

Activated carbon fiber (ACF) was used for the adsorption of phenol in petrochemical wastewater. Adsorption isotherms at 25, 40, 55 and 65℃ were determined and fitted with Langmuir, Freundlich and Redlich-Peterson equations. The results show that the adsorption equilibrium data fit Langmuir and Redlich- Peterson equations better than the Freundlich equation. The phenol adsorption ability of ACF from simulated wastewater decreases with the increase of temperature, while the situation is somewhat different with petrochemical wastewater. The adsorption kinetic data fit the pseudo-second-order kinetic model well in petrochemical wastewater and simulated wastewater. The intra-particle diffusion is the main rate-controlling step in the initial period and k_id of phenol adsorption increases with temperature in petrochemical wastewater. The adsorption rate is influenced by intra-particle diffusion and external diffusion in the middle and later period. Thermodynamic analysis shows that the ΔG value is negative, indicating that the adsorption of phenol in petrochemical wastewater by ACF is spontaneous. However, ΔG does not change obviously with temperature owing to the influence of oil on phenol adsorption in petrochemical wastewater.

Key words: adsorption, activated carbon fiber, phenol, wastewater, kinetics

中图分类号:

TQ028

孔黎明, 张婷, 王佩德, 周祥, 贾哲华. 活性炭纤维吸附石化废水中苯酚的吸附平衡及动力学[J]. 化工学报, 2015, 66(12): 4874-4882.

KONG Liming, ZHANG Ting, WANG Peide, ZHOU Xiang, JIA Zhehua. Equilibrium and kinetics of phenol adsorption from petrochemical wastewater with activated carbon fiber[J]. CIESC Journal, 2015, 66(12): 4874-4882.

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活性炭纤维吸附石化废水中苯酚的吸附平衡及动力学

Equilibrium and kinetics of phenol adsorption from petrochemical wastewater with activated carbon fiber

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