工业水处理 ›› 2025, Vol. 45 ›› Issue (6): 61-72. doi: 10.19965/j.cnki.iwt.2025-0011

• 石油石化行业废水处理专题 • 上一篇    下一篇

炼厂剩余污泥热解炭去除水中氯酚类污染物的效果与机制

胡昀涛(), 曹越, 李琢宇(), 詹亚力, 王庆宏, 陈春茂   

  1. 中国石油大学(北京)化学工程与环境学院,重质油全国重点实验室,北京 102249
  • 收稿日期:2025-04-10 出版日期:2025-06-20 发布日期:2025-06-19
  • 通讯作者: 李琢宇
  • 作者简介:

    胡昀涛(1999— ),硕士,E-mail:

  • 基金资助:
    中国石油大学(北京)科研基金项目(2462024YJRC004)

Effect and mechanism of removing chlorophenolic pollutants from water by refinery residual activated sludge pyrolytic carbon

Yuntao HU(), Yue CAO, Zhuoyu LI(), Yali ZHAN, Qinghong WANG, Chunmao CHEN   

  1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering and Environment, China University of Petroleum (Beijing), Beijing 102249, China
  • Received:2025-04-10 Online:2025-06-20 Published:2025-06-19
  • Contact: Zhuoyu LI

摘要:

通过一步热解法热解炼厂剩余污泥制备污泥热解炭(Sludge pyrolytic carbon,SPC),对其结构进行表征,并将其用于吸附4-氯苯酚(4-CP),探究其对4-CP的吸附性能。研究结果表明,在热解温度600 ℃、热解停留时间1.5 h、升温速率10 ℃/min下制得的SPC表面不规整,具有片状颗粒堆积结构和大量介孔,其在实验的最佳投加量(3.75 g/L)下对4-CP的吸附量为11.79 mg/g,且吸附量在pH处于3~11的范围内保持稳定。SPC对4-CP的吸附过程较为遵循Weber-Morris颗粒内扩散模型,表明吸附过程的限速步骤是介孔和微孔内扩散,存在孔隙填充现象,此外Dubinin-Radushkevich(D-R)模型与吸附也具有较高拟合度,表明吸附过程同时存在物理和化学作用。—OH、C ̿      O和sp2-C的π-π结构是SPC的主要反应位点,SPC通过疏水作用、π-π作用、氢键作用吸附4-CP,进而通过C ̿      O和缺陷位点生成1O2使4-CP缓慢氧化。SPC经4次固定床循环实验后对4-CP、2-氯酚的吸附性能稳定,具有作为氯酚类吸附剂的应用潜力。

关键词: 污泥热解炭, 吸附, 4-氯苯酚, 固定床, 吸附机制

Abstract:

Sludge pyrolytic carbon(SPC) was prepared by one-step pyrolysis of residual activated sludge from refineries, and its structure was characterized. It was used to adsorb 4-chlorophenol(4-CP) to investigate its adsorption performance for 4-CP. The results showed that the SPC prepared at pyrolysis temperature of 600 ℃, residence time of 1.5 h, and heating rate of 10 ℃/min had an irregular surface with sheet-like particle stacking structure and a large number of mesopores. At the optimal dosage (3.75 g/L) in the experiment, the adsorption capacity for 4-CP was 11.79 mg/g, and the adsorption capacity remained stable within pH range of 3-11. The adsorption process of 4-CP by SPC followed the Weber-Morris intraparticle diffusion model, indicating that the rate limiting step of the adsorption process was diffusion within mesopores and micropores, and there was pore filling phenomenon. In addition, the Dubinin-Radushkevich(D-R) model also had a high degree of fit with adsorption, indicating that there were both physical and chemical interactions in the adsorption process. The —OH, C ̿      O, and π-π structures of sp2-C were the main reaction sites of SPC, which adsorbed 4-CP through hydrophobic, π-π, and hydrogen bonding interactions, and then generated 1O2 through C ̿      O and defected sites to slowly oxidize 4-CP. After 4 fixed bed cycle experiments, SPC showed stable adsorption performance for 4-CP and 2-chlorophenol, and had the potential to be used as a chlorophenol adsorbent.

Key words: sludge pyrolytic carbon, adsorption, 4-chlorophenol, fixed bed, adsorption mechanism

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