纺织学报 ›› 2021, Vol. 42 ›› Issue (02): 122-128.doi: 10.13475/j.fzxb.20201002307

• 染整与化学品 • 上一篇    下一篇

基于锆-有机骨架的印染废水中Cr(VI)的荧光检测

管斌斌1,2, 李庆1,2(), 陈灵辉1,2, 徐宇婷1,2, 樊增禄3   

  1. 1.西安工程大学 西安市纺织化工助剂重点实验室, 陕西 西安 710048
    2.西安工程大学 环境与化学工程学院, 陕西 西安 710048
    3.西安工程大学 功能性纺织材料及制品教育部重点实验室, 陕西 西安 710048
  • 收稿日期:2020-10-12 修回日期:2020-11-21 出版日期:2021-02-15 发布日期:2021-02-23
  • 通讯作者: 李庆
  • 作者简介:管斌斌(1995—),男,硕士生。主要研究方向为功能性金属有机框架材料的构筑及其对染料废水的处理。
  • 基金资助:
    国家自然科学基金面上项目(22078253);国家级大学生创新训练计划项目(S202010709027);陕西省重点研发计划项目(2020GY-276);陕西省教育厅专项项目(19JC016);西安市科技计划项目(2019217114GXRC007CG008-GXYD7.1);西安市科技计划项目(BLKJ2020YYJS-0001);西安工程大学研究生创新基金项目(chx2020023)

Fluorescence detection of Cr(VI) from printing and dyeing wastewater by zirconium-organic framework

GUAN Binbin1,2, LI Qing1,2(), CHEN Linghui1,2, XU Yuting1,2, FAN Zenglu3   

  1. 1. Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. School of Environmental & Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    3. Key Laboratory of Functional Textile Materials and Products, Ministry of Education, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
  • Received:2020-10-12 Revised:2020-11-21 Online:2021-02-15 Published:2021-02-23
  • Contact: LI Qing

摘要:

针对印染废水中重金属铬Cr(VI)离子造成的污染,采用氯化锆与2,2'-联喹啉-4,4'-二甲酸(H2L)反应,合成了Zr-金属有机骨架(Zr-MOF)。经粉末X射线衍射表征证实Zr-MOF在水中和强酸/碱环境中具有结构稳定性。经荧光测试证明Zr-MOF的光致发光性能。对水中Cr(VI)离子的荧光传感检测结果表明,Zr-MOF在多种混合阴/阳离子的干扰下,可以对水中痕量的 CrO 4 2 - 和$Cr_{2}O_{7}^{2-}$离子进行高选择性荧光淬灭识别和定量检测,其检出限分别为6.704和11.232 mg/L。并提出了Zr-MOF的光致发光和荧光淬灭检测机制。此外,经过7次连续的荧光检测循环后,Zr-MOF的荧光发射强度仍能维持在95%以上。

关键词: 印染废水, 铬(VI), Zr-金属有机骨架, 荧光检测, 抗干扰

Abstract:

Considering the pollution caused by heavy metal chromium ions in printing and dyeing wastewater, zirconium chloride and 2,2'-biquinoline-4,4'-dicarboxylic acid (H2L) were used to synthesize Zr-metal organic framework (Zr-MOF). The structural stability in water and in strong acid/base environments and photoluminescence property of Zr-MOF were confirmed by powder X-ray diffraction and fluorescence tests. The results of fluorescence sensing detection of Cr(VI) ions show that Zr-MOF performs highly selective fluorescence quenching recognition and quantitative detection towards trace CrO 4 2 - and $Cr_{2}O_{7}^{2-}$ ions in water, under the interference of a variety of mixed anion and ions. The detection limits are confirmed to be 6.704 and 11.232 mg/L for CrO 4 2 - and $Cr_{2}O_{7}^{2-}$ ions, respectively. The photoluminescence and fluorescence quenching detection mechanisms of Zr-MOF are proposed. Furthermore, after 7 consecutive fluorescence detection cycles, the fluorescence emission intensity of Zr-MOF still retains at above 95%.

Key words: printing and dyeing wastewater, Cr(VI), Zr-organic framework, fluorescence detection, anti-interference

中图分类号: 

  • TS190.2

图1

Zr-MOF的荧光激发光谱和发射光谱"

图2

Zr-MOF在去离子水和不同pH值水溶液中的荧光强度变化"

图3

在去离子水和不同pH值水溶液中Zr-MOF的X射线衍射图谱"

表1

Zr-MOF在各种阴/阳离子溶液中的荧光发射强度"

离子
种类
荧光发
射强度
离子
种类
荧光发
射强度
离子
种类
荧光发
射强度
空白 850 Al3+ 596 NO2- 559
Na+ 770 Cu2+ 720 IO3- 658
K+ 733 Fe3+ 731 PO43- 873
Mg2+ 843 F- 789 HPO42- 853
Ni2+ 744 Cl- 930 SCN- 541
Pb2+ 802 Br- 854 C2H5O- 856
Co2+ 736 CO32- 786 CrO42- 20
Cr3+ 591 SO42- 806 Cr2O72- 5
Cd2+ 748 NO3- 733

图4

不同浓度Cr(VI)离子对Zr-MOF荧光发射强度的影响"

表2

加入Cr(VI)前后的混合阴/阳离子水溶液中Zr-MOF的荧光发射强度"

离子种类 荧光发射强度/a.u.
空白 850
混合阴离子 680
混合阴离子加CrO42- 20
混合阴离子加Cr2O72- 23
混合阳离子 650
混合阳离子加CrO42- 10
混合阳离子加Cr2O72- 12

图5

Zr-MOF对CrO42-和Cr2O72-离子的循环检测能力"

图6

7次循环后及被CrO42-、Cr2O72-离子 浸泡后Zr-MOF的X射线衍射图谱"

图7

Zr-MOF的激发光谱和发射光谱以及CrO42-、Cr2O72-离子的紫外-可见光吸收光谱"

图8

Zr-MOF及被Cr(VI)离子浸泡前后的XPS谱图"

图9

Zr-MOF被CrO42-和Cr2O72-浸泡前后的红外光谱图"

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