Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (03): 139-145.doi: 10.13475/j.fzxb.20210202107

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

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 Online:2022-03-15 Published:2022-03-29
  • Contact: YU Bin E-mail:yubin7712@163.com

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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

CLC Number: 

  • TS101.8

Fig.1

Standard curve of absorbance-concentration of K2Cr2O7 aqueous solution"

Fig.2

XRD patterns of UiO-66-NH2 and PU/UiO-66-NH2 with different MOFs contents"

Fig.3

SEM images of UiO-66-NH2 and PU/ UiO-66-NH2 with 10% MOFs, 20% MOFs and 30% MOFs"

Tab.1

Cr2 O 7 2 - adsorption properties of UiO-66-NH2 powder and PU/UiO-66-NH2/PP composites"

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

Tab.2

Mass loss rates of UiO-66-NH2/PP and PU/UiO-66-NH2/PP composites under different ultrasonic washing time"

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

Fig.4

Adsorption performance of Cr(Ⅵ) by M0 and M2 in different concentration K2Cr2O7 aqueous solution(pH=7)"

Fig.5

Light absorption performance of UiO-66-NH2 and PU/UiO-66-NH2/PP composites. (a) UV-visible diffuse reflectance spectroscopy; (b) Plot of (αhv)2 versus energy(hv)for bandgap energy of samples"

Fig.6

Photocatalytic reduction performance of Cr(Ⅵ) by M0 and M2 in K2Cr2O7 aqueous solution with different pH value"

Fig.7

XPS peak division of Cr 2p3/2"

Fig.8

Cycling runs of photocatalytic reduction of Cr(Ⅵ) over PU/UiO-66-NH2/PP composites"

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