工业水处理 ›› 2024, Vol. 44 ›› Issue (1): 148-156. doi: 10.19965/j.cnki.iwt.2022-1323

• 试验研究 • 上一篇    下一篇

氮掺杂介孔碳对含Pb(Ⅱ)隧洞施工废水的吸附性能

蒲小平1(), 段鹏昌2, 秦云1, 凌涛1, 熊鹰3,4, 刘媛媛3()   

  1. 1. 中铁开发投资集团有限公司,云南 昆明 650100
    2. 中铁五局集团第一工程有限责任公司,湖南 长沙 410117
    3. 长沙理工大学资源环境与城乡规划研究中心,湖南 长沙 410114
    4. 洞庭湖水环境治理与生态修复湖南省重点实验室,湖南 长沙 410114
  • 收稿日期:2023-11-30 出版日期:2024-01-20 发布日期:2024-01-24
  • 作者简介:

    蒲小平(1974— ),高级工程师。电话:13528893696,E-mail:

    刘媛媛,博士,讲师。E-mail:

  • 基金资助:
    中国中铁科技研究开发计划课题(2020-重大专项-04); 长沙市自然科学基金项目(kq2202214); 长沙理工大学土木工程重点学科创新性项目(17ZDXK02); 湖南省教育厅科学研究项目(19C0039); 湖南省自然科学基金项目(2019JJ50668)

Adsorption performance of Pb(Ⅱ) by nitrogen-doped mesoporous carbon in tunnel construction wastewater

Xiaoping PU1(), Pengchang DUAN2, Yun QIN1, Tao LING1, Ying XIONG3,4, Yuanyuan LIU3()   

  1. 1. China Railway Development Investment Group Co. ,Ltd. ,Kunming 650100,China
    2. The First Engineering Co. ,Ltd. ,of China Railway Wuju Group,Changsha 410117,China
    3. Research Center of Resource Environment and Urban Planning,Changsha 410114,China
    4. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China
  • Received:2023-11-30 Online:2024-01-20 Published:2024-01-24

摘要:

采用硬模板法制备氮掺杂介孔碳,分别采用比表面积分析仪、透射电镜、红外光谱仪和X射线光电子能谱分析表征材料结构及理化性质。将该材料应用于对2种隧洞施工废水中Pb(Ⅱ)的吸附,研究pH、反应时间对吸附效果的影响以及反应动力学、等温模型。研究发现,该体系的吸附动力学与二级动力学方程基本一致,其吸附特性与Langmuir和Temkin等温模型相适应。实验结果与表征结果表明,材料吸附Pb(Ⅱ)的过程涉及到静电作用、孔道扩散等物理吸附以及表面含氮官能团与Pb(Ⅱ)的化学吸附。2种废水中基于Langmuir模型的最大吸附量分别为493.5 mg/g和603.9 mg/g。吸附材料可通过HCl处理实现有效再生与重复利用。

关键词: 介孔碳, 氮掺杂, 隧洞施工废水, 铅, 吸附

Abstract:

Nitrogen-doped mesoporous carbon(NMC) was synthesized using hard-template,and was characterized using specific surface area analyzer,transmission electron microscope,Fourier transform-infrared spectrometer and X-ray photoelectron spectroscopy. NMC was applied in the adsorption of Pb(Ⅱ) in two different tunnel construction wastewaters,and the effects of pH,reaction time on adsorption and its adsorption kinetics models and sorption isotherms were investigated. The results showed that the adsorption kinetics was best described by pseudo-second-order model,and its adsorption characteristics conformed to the Langmuir and Temkin model. According to the results of the experiments and characterization,Pb(Ⅱ) adsorption by NMC involved physisorption such as electrostatic interaction and pore diffusion and chemisorption like chelation with functional groups. The estimated maximum adsorption capacity based on Langmuir model was 493.5 mg/g and 603.9 mg/g,respectively for the two wastewaters. In addition,NMC could be regenerated and reused by treatment with HCl.

Key words: mesoporous carbon, nitrogen-doping, tunnel construction wastewater, Pb(Ⅱ), adsorption

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