工业水处理 ›› 2023, Vol. 43 ›› Issue (5): 69-76. doi: 10.19965/j.cnki.iwt.2022-0694

• 试验研究 • 上一篇    下一篇

粉末活性炭对焦化反渗透浓水的吸附选择性研究

刘紫岩(), 马宏瑞(), 朱超, 耿跃, 郝永永   

  1. 陕西科技大学环境科学与工程学院,陕西 西安 710021
  • 收稿日期:2023-03-14 出版日期:2023-05-20 发布日期:2023-05-23
  • 通讯作者: 马宏瑞 E-mail:616347610@qq.com;mahr@sust.edu.cn
  • 作者简介:刘紫岩(1994— ),硕士。电话:13679261966,E-mail:616347610@qq.com
    马宏瑞,教授。E-mail:mahr@sust.edu.cn
  • 基金资助:
    国家自然科学基金项目(22076113)

Adsorption selectivity of powdered activated carbon for coking reverse osmosis concentrated water

Ziyan LIU(), Hongrui MA(), Chao ZHU, Yue GENG, Yongyong HAO   

  1. School of Environmental Science and Engineering,Shaanxi University of Science & Technology,Xi’an 710021,China
  • Received:2023-03-14 Online:2023-05-20 Published:2023-05-23
  • Contact: Hongrui MA E-mail:616347610@qq.com;mahr@sust.edu.cn

摘要:

以活性炭为主的吸附材料在面对工业尾水时对不同种类有机污染物的吸附存在一定的差异并难以彻底去除。实验通过粉末活性炭(PAC)对焦化反渗透浓水(ROC)的吸附过程进行解析,结果表明,PAC的吸附选择性主要基于两个方面的因素:一方面,十四烷、角鲨烯等部分长链有机物的分子直径大于PAC的最佳吸附孔径(0.5~1 nm),因此难以得到有效去除;另一方面,有机物对PAC表面大量含氧官能团的相互竞争以及PAC表面含氮官能团的缺少,使得苯酚类有机物与PAC之间的相互作用降低。从PAC对ROC的吸附过程来看,吸附启动阶段PAC主要依靠孔道通过物理作用吸附芳香类有机物,而在吸附中期则依靠表面官能团与有机物的相互作用吸附烷烃、烯烃等非芳香族有机物,整体吸附过程更符合拟二级动力学和Freundlich等温模型。

关键词: 粉末活性炭, 反渗透浓水, 孔径结构, 吸附选择性

Abstract:

The adsorption efficiency of different organic pollutants by activated carbon based adsorbent materials varies in the face of industrial tailwater and seldomly reach a completely removal. The adsorption process of powdered activated carbon(PAC) on coked reverse osmosis concentrated water(ROC) was analyzed in this study. The results showed that the adsorption selectivity of PAC was mainly based on two factors. On one hand, the molecular size of some long-chain organics such as tetradecane and squalene is larger than the optimal adsorption pore size of PAC(0.5-1 nm),leading to an ineffective removal. On the other hand, the mutual competition of organics for a large number of oxygen-containing functional groups on the PAC surface and the lack of nitrogen-containing functional groups on the PAC surface reduce the interaction between phenol-based organic matter and PAC. From the adsorption process of PAC on ROC,PAC mainly relied on the pore size to adsorb aromatic organics through physical interaction in the initiation stage,while in the middle stage the interaction between surface functional groups and organics dominated the adsorption of non-aromatic organics such as alkanes olefins. The overall adsorption process is more consistent with the proposed secondary kinetics and Freundlich isothermal model.

Key words: powder activated carbon, reverse osmosis concentrated water, pore structure, adsorption selectivity

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