纺织学报 ›› 2021, Vol. 42 ›› Issue (06): 133-139.doi: 10.13475/j.fzxb.20200805907

所属专题： 印染废水处理技术

• 染整与化学品 • 上一篇    下一篇

膨胀石墨负载纳米铁的制备及其对水中Cr(Ⅵ)及染料的去除

田利强1,2(), 梁敏3, 龙康2, 陈秀清4   

  1. 1. 陕西省无机材料绿色制备和功能化重点实验室(陕西科技大学), 陕西 西安 710021
    2. 陕西科技大学 环境科学与工程学院, 陕西 西安 710021
    3. 陕西科技大学 设计与艺术学院,陕西 西安 710021
    4. 扬州工业职业技术学院 化学工程学院, 江苏 扬州 225127
  • 收稿日期:2020-08-05 修回日期:2021-03-02 出版日期:2021-06-15 发布日期:2021-06-28
  • 作者简介:田利强 (1979—),男,讲师,博士。主要研究方向为棉织物的染整工艺及印染废水治理。E-mail: yanjing915@163.com。
  • 基金资助:
    陕西省无机材料绿色制备和功能化重点实验室开放课题基金资助(202011);陕西高校新型智库开放基金项目(ACNM-202107)

Synthesis of nanoscale iron supported on expanded graphite for removal of chromium (Ⅵ) and dyes from water

TIAN Liqiang1,2(), LIANG Min3, LONG Kang2, CHEN Xiuqing4   

  1. 1. Key Laboratory of Green Preparation and Functionalization for Inorganic Materials (Shaanxi University of Science & Technology), Xi'an, Shaanxi 710021, China
    2. College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
    3. College of Art and Design, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
    4. Department of Chemical Engineering, Yangzhou Polytechnic Institute,Yangzhou, Jiangsu 225127, China
  • Received:2020-08-05 Revised:2021-03-02 Published:2021-06-15 Online:2021-06-28

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摘要：

为有效去除印花废水中的染料和花筒剥铬时形成的Cr(Ⅵ),合成了纳米零价铁(GS-NZVI)和膨胀石墨负载纳米零价铁(GS-EG-NZVI)2种新型吸附剂。借助场发射扫描电子显微镜、能谱仪、X射线衍射仪等对二者进行表征。探讨了GS-EG-NZVI对水中的Cr(Ⅵ)和染料去除效果以及动力学和稳定性。结果表明:纳米级零价铁成功负载到膨胀石墨(EG)表面,且分散性较好;对于含有50 mg/L汽巴克隆藏青染料和20 mg/L Cr(Ⅵ)的溶液,加入2.5 g/L GS-EG-NZVI,在温度为50 ℃,pH值为2,超声波辅助的条件下反应35 min,染液脱色率为90.6%,Cr(Ⅵ)去除率为53.6%;GS-EG-NZVI对二者的去除符合伪二级动力学方程;将吸附剂置于空气中不同时间,GS-EG-NZVI 对Cr(Ⅵ)的去除活性明显高于GS-NZVI, GS-EG-NZVI较GS-NZVI有更高的稳定性。

关键词: 膨胀石墨, 纳米铁, Cr(Ⅵ), 染料, 吸附性能, 废水处理

Abstract:

For dyes and Cr (VI) stripped from metallic roller in the printing process, two new adsorbents, nanoscale zero-valent iron (GS-NZVI) and nanoscalezero-valent iron supported on expanded graphite (GS-EG-NZVI) were green-synthesized. The two adsorbents were characterized by field emission electron microscopy, energy dispersive spectrometer, X-ray diffraction, etc. GS-EG-NZVI was investigated on the removal of Cr(VI) and dyes of aqueous solution, and on the corresponding dynamics and stability. Results indicated that nanoscalezero-valent iron was successfully loaded on the surface of EG with good dispersion. For the aqueous solution including 50 mg/L Cibacron Dark Blue and 20 mg/L Cr (Ⅵ), addition of 2.5 g/L GS-EG-NZVI led to the achievements of the removal rates of 90.6% of dyes and 53.6% of Cr (VI) respectively under the conditions of at 50 ℃, pH=2, 35 min reaction time with ultrasound assistance. The two removal processes fitted well with the pseudo second-order dynamic model. GS-EG-NZVI showed higher potential for removing Cr(Ⅵ) in aqueous solution than GS-NZVI due to its high stability after being placed in the air for different time.

Key words: expanded graphite, nanoscale iron, Cr(Ⅵ), dye, adsorption, wastewater treatment

中图分类号: 

  • X703

图1

不同样品的场发射扫描电镜照片"

图2

不同样品的EDS谱图"

图3

GS-NZVI的TEM照片(×100 000)"

图4

不同样品的红外谱图"

图5

不同样品的XRD谱图"

表1

不同样品的比表面积"

样品 比表面积/(m2·g-1) 吸附累计孔体积/(cm3·g-1)
EG 137.5 0.227
GS-EG-NZVI 145.9 0.221

图6

反应时间对染料和Cr(Ⅵ)去除率的影响"

图7

GS-EG-NZVI投加量对染料和Cr(Ⅵ)去除率的影响"

图8

pH值对染料和Cr(Ⅵ)去除率的影响"

图9

温度对染料和Cr(Ⅵ)去除率的影响"

表2

GS-EG-NZVI和GS-NZVI放置时间对Cr(Ⅵ)去除率的影响"

放置时间/d Cr(Ⅵ)去除率/%
GS-EG-NZVI GS-NZVI
1 53 52
2 52 50
4 52 44
7 50 35
10 45 25
15 40 10

表3

GS-EG-NZVI吸附染料和Cr(Ⅵ)的动力学参数"

污染物 C0/
(mg·L-1) 		qexq/
(mg·g-1) 		伪一级动力学模型 伪二级动力学模型
k1/
min-1 		qeq/
(mg·g-1) 		R2 k2/
(mg·mg-1·min-1) 		qeq/
(mg·g-1) 		R2
染料 50 42.5 0.042 34.45 0.913 5 0.174 43.29 0.999
Cr(Ⅵ) 20 2.18 0.175 1.39 0.899 6 0.203 2.07 0.992
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