纺织学报 ›› 2022, Vol. 43 ›› Issue (03): 139-145.doi: 10.13475/j.fzxb.20210202107

• 染整与化学品 • 上一篇    下一篇

基于金属有机框架化合物的非织造复合材料制备及其对废水中六价铬的去除

禹凡, 郑涛, 汤涛, 金梦婷, 朱海霖, 于斌()   

  1. 浙江理工大学 纺织科学与工程学院(国际丝绸学院), 浙江 杭州 310018
  • 收稿日期:2021-02-05 修回日期:2021-12-29 出版日期:2022-03-15 发布日期:2022-03-29
  • 通讯作者: 于斌
  • 作者简介:禹凡(1989—),女,博士生。主要研究方向为金属有机框架材料在水处理中的应用。
  • 基金资助:
    浙江理工大学纺织科学与工程学院研究生创新项目(201910301007);浙江理工大学本科生科研创新计划项目(11150032662108)

Preparation of nonwoven composites based on metal-organic frame compounds and removal of hexavalent chromium from wastewater

YU Fan, ZHENG Tao, TANG Tao, JIN Mengting, ZHU Hailin, YU Bin()   

  1. College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2021-02-05 Revised:2021-12-29 Published:2022-03-15 Online:2022-03-29
  • Contact: YU Bin

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摘要：

为解决水体中重金属六价铬(Cr(Ⅵ))的污染问题,利用聚氨酯(PU)对锆基金属有机框架化合物(UiO-66-NH2)进行接枝改性,将改性所得PU/UiO-66-NH2负载于聚丙烯(PP)非织造布上制备PU/UiO-66-NH2/PP非织造布复合材料,最后将其用于Cr(Ⅵ)的吸附与可见光催化还原。探讨UiO-66-NH2添加量对复合材料结构与性能的影响,分析PU/UiO-66-NH2与PP非织造布间的结合牢度,探究复合材料对Cr(Ⅵ)的吸附与光催化还原性能。结果表明:PU改性后的UiO-66-NH2依然保留有原有的拓扑结构,当PU/UiO-66-NH2中金属有机框架材料(MOFs)的质量分数为20%时,PU/UiO-66-NH2/PP非织造布复合材料对Cr(Ⅵ)具有良好的吸附性能;经超声波水洗后,PU/UiO-66-NH2/PP非织造布复合材料没有发生明显的质量损失,表明PU/UiO-66-NH2与PP非织造布有良好的结合牢度;在可见光照下,PU/UiO-66-NH2/PP非织造布复合材料兼具吸附和催化作用,可将Cr(Ⅵ)有效还原成Cr(Ⅲ),同时该复合材料经4次重复利用后性能稳定。

关键词: 六价铬, 废水, 金属有机框架化合物, 非织造布, 吸附, 催化还原

Abstract:

To solve the pollution of hexavalent chromium (Cr(VI)) in water, graft modification of Zirconium-based organic frame compound (UiO-66-NH2) by polyurethane (PU) was proposed. The modified PU/UiO-66-NH2 was then deposited onto polypropylene (PP) nonwovens to prepare PU/UiO-66-NH2/PP nonwoven composites, intended for Cr (Ⅵ) adsorption and visible light catalytic reduction. The effect of metal-organic frameworks(MOFs) content on the PU/UiO-66-NH2/PP nonwoven composites performance and the bonding fastness between PU/UiO-66-NH2 and PP fabrics were explored, and the performances of the composites for adsorption and photocatalytic reduction of Cr (Ⅵ) were analyzed. The results showed that PU/UiO-66-NH2 retains the original topology of UiO-66-NH2, and when the UiO-66-NH2 content was 20%, PU/UiO-66-NH2/PP nonwoven composites present good adsorption performance for Cr (Ⅵ). The PU/UiO-66-NH2/PP nonwoven composites have no obvious mass loss after different time ultrasonic washing, indicating good bonding fastness between PU/UiO-66-NH2 and PP fabrics. Under visible light, PU/UiO-66-NH2/PP nonwoven composites are both adsorbent and photocatalyst. Meanwhile, the composites show good performance after reutilization for 4 times.

Key words: hexavalent chromium, wastewater, metal-organic frameworks, nonwoven, adsorption, catalytic reduction

中图分类号: 

  • TS101.8

图1

K2Cr2O7水溶液的吸光度-质量浓度标准曲线"

图2

UiO-66-NH2和不同MOFs添加量改性所得PU/UiO-66-NH2的XRD谱图"

图3

UiO-66-NH2和不同MOFs质量分数下改性所得PU/UiO-66-NH2的SEM照片"

表1

UiO-66-NH2粉末和PU/UiO-66-NH2/PP非织造布复合材料对Cr2 O 7 2 -的吸附性能"

样品 MOFs质量
分数/%		 PP非织造布
增加质量/mg		 MOFs
质量/mg		 饱和吸附量/
(mg·g-1)
UiO-66-NH2粉末 — — 20.0 152.7
M1 10 159 15.9 97.9
M2 20 189 37.8 144.3
M3 30 209 62.7 125.6

表2

UiO-66-NH2/PP和PU/UiO-66-NH2/PP非织造布复合材料在不同超声波水洗时间下的质量损失率"

样品 不同水洗时间下的质量损失率/%
0 min 5 min 10 min 20 min 30 min
UiO-66-NH2/PP 0 32.2 71.0 81.4 89.8
PU/UiO-66-NH2/PP 0 1.4 2.7 4.5 4.5

图4

M0和M2对不同质量浓度K2Cr2O7水溶液Cr(Ⅵ)的吸附性能(pH=7)"

图5

UiO-66-NH2和PU/UiO-66-NH2/PP非织造布复合材料的光吸收性能"

图6

M0和M2在不同pH值条件下对Cr(Ⅵ)的光催化还原性能"

图7

Cr 2p3/2的XPS分峰示意图"

图8

PU/UiO-66-NH2/PP非织造布复合材料光催化还原Cr(Ⅵ)重复利用性能"

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