高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (3): 20210701.doi: 10.7503/cjcu20210701

• 研究论文: 无机化学 • 上一篇    下一篇

UiO-66-NH2/wood的设计构筑及高效去除水中微量重金属离子性能

李华1,2, 杨科1, 黄俊峰1, 陈凤娟1()   

  1. 1.功能有机分子化学国家重点实验室, 兰州大学化学化工学院, 兰州 730000
    2.兰州大学材料与能源学院, 兰州 730000
  • 收稿日期:2021-10-04 出版日期:2022-03-10 发布日期:2021-12-28
  • 通讯作者: 陈凤娟 E-mail:chenfj@lzu.edu.cn
  • 基金资助:
    国家自然科学基金(21876072);发光与实时分析化学教育部重点实验室(西南大学)开放基金(LAMS20210701);甘肃省科技计划项目(21JR7RA491)

Design and Construction of UiO-66-NH2/wood Composite for Efficient Removal of Trace Heavy Metal Ions from Water

LI Hua1,2, YANG Ke1, HUANG Junfeng1, CHEN Fengjuan1()   

  1. 1.State Key Laboratory of Applied Organic Chemistry,School of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China
    2.School of Material and Energy,Lanzhou University,Lanzhou 730000,China
  • Received:2021-10-04 Online:2022-03-10 Published:2021-12-28
  • Contact: CHEN Fengjuan E-mail:chenfj@lzu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21876072);the Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University), Ministry of Education, China(LAMS20210701);the Science and Technology Project of Gansu Province, China(21JR7RA491)

摘要:

矿山开采、 金属冶炼、 新型金属材料的发展以及城市供水系统老化所造成的重金属(铅、 镉、 汞、 砷、 铬、 铜及锌等)污染问题已日趋严重. 传统的水处理方法很难有效地去除低浓度的重金属污染物. 本文以天然木材为载体, 采用溶剂热合成法, 在木材三维孔道中原位合成UiO-66-NH2金属有机框架材料(MOFs)纳米颗粒, 制备了UiO-66-NH2/wood复合膜材料. 该复合膜材料对去除水中微量重金属离子(Hg2+, Cu2+)表现出优异的性能. 当处理速率为1.1×102 L?m-2?h-1时, 该复合膜材料去除水中微量重金属离子的效率仍可达到90%以上, 且处理后水中重金属离子含量低于国家饮用水标准. 这可归因于木材本身独特的三维孔道结构, 在提高水通量的同时, 还可以增加水溶液中重金属离子与MOFs颗粒的接触机会, 以及孔道内均匀分布的UiO-66-NH2 MOFs颗粒中的—NH2可以与重金属离子通过配位作用相结合. 该UiO-66-NH2/wood复合膜材料还具有良好的重复利用性, 在连续6次循环使用后其去除效率无明显变化, 有望进行实际应用.

关键词: 木材, UiO-66-NH2金属有机框架材料(MOFs), 水处理, 微量重金属离子

Abstract:

UiO-66-NH2 Metal-Organic-Frameworks(MOFs) nanoparticles were in situ formed in the 3D low-tortuosity wood lumens by a facile solve-thermal strategy with ZrCl4 and amino terephthalic acid as precursors. The UiO-66-NH2/wood membrane showed excellent removal performance for removing heavy metal ions(Hg2+, Cu2+) in wastewater. The results showed that the removal efficiency for tested heavy metal ions(Hg2+, Cu2+) is more than 90.0% at the treatment rate of 1.0×102 L?m-2?h-1. Wood membrane, as a 3D substrate for anchoring UiO-66-NH2 nanoparticles, contains numerous elongated and open lumens along the growth direction. On the one hand, it can enhance the water of including heavy metal ions fluxes; on the other hand, it can increase the contact probability of heavy metal ion containments with UiO-66-NH2 MOFs as water flowing through the membrane. Therefore, the UiO-66-NH2/wood membrane can efficiently remove trace heavy metal ions from the water. In addition, the UiO-66-NH2/wood membrane also has good reusability, which is expected to be applied in practical applications.

Key words: Wood membrane, UiO-66-NH2 Metal-Organic-Frameworks(MOFs), Water treatment, Trace heavy metal ion

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