SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (4): 731-739.DOI: 10.1016/j.cjche.2017.07.014

• Separation Science and Engineering • 上一篇    下一篇

The adsorptive properties of UiO-66 towards organic dyes: A record adsorption capacity for the anionic dye Alizarin Red S.

Marwa S. Embaby1, Saber D. Elwany1, Widiastuti Setyaningsih2, Mohamed R. Saber3   

  1. 1 Central laboratories, Fayoum Drinking Water and Sanitation Company(FDWaSC), Fayoum 63754, Egypt;
    2 Food and Agricultural Product Technology Department, Faculty of Agricultural Technology, Gadjah Mada University, Jalan Flora, Bulaksumur, Yogyakarta, 55281, Indonesia;
    3 Chemistry Department, Faculty of Science, Fayoum University, Fayoum 63514, Egypt
  • 收稿日期:2017-05-02 修回日期:2017-07-13 出版日期:2018-04-28 发布日期:2018-05-19
  • 通讯作者: Mohamed R. Saber,E-mail address:msaber@fayoum.edu.eg

The adsorptive properties of UiO-66 towards organic dyes: A record adsorption capacity for the anionic dye Alizarin Red S.

Marwa S. Embaby1, Saber D. Elwany1, Widiastuti Setyaningsih2, Mohamed R. Saber3   

  1. 1 Central laboratories, Fayoum Drinking Water and Sanitation Company(FDWaSC), Fayoum 63754, Egypt;
    2 Food and Agricultural Product Technology Department, Faculty of Agricultural Technology, Gadjah Mada University, Jalan Flora, Bulaksumur, Yogyakarta, 55281, Indonesia;
    3 Chemistry Department, Faculty of Science, Fayoum University, Fayoum 63514, Egypt
  • Received:2017-05-02 Revised:2017-07-13 Online:2018-04-28 Published:2018-05-19
  • Contact: Mohamed R. Saber,E-mail address:msaber@fayoum.edu.eg

摘要: In order to decisively determine the adsorption selectivity of zirconium MOF (UiO-66) towards anionic versus cationic species, the adsorptive removal of the anionic dyes (Alizarin Red S. (ARS), Eosin (E), Fuchsin Acid (FA) and Methyl Orange (MO)) and the cationic dyes (Neutral Red (NR), Fuchsin Basic (FB), Methylene Blue (MB), and Safranine T (ST)) has been evaluated. The results clearly reveal a significant selectivity towards anionic dyes. Such an observation agrees with a plethora of reports of UiO-66 superior affinity towards other anionic species (Floride, PO43-, Diclofenac sodium, Methylchlorophenoxy-propionic acid, Phenols, CrO42-, SeO32-, and AsO4-). The adsorption process of ARS as an example has been optimized using the central composite design (CCD). The resultant statistical model indicates a crucial effect of both pH and sorbent mass. The optimum conditions were determined to be initial dye concentration 11.82 mg.L-1, adsorbent amount 0.0248 g, shaking time of 36 min and pH 2. The adsorption process proceeds via pseudo-second order kinetics (R2=0.999). The equilibrium data were fit to Langmuir and Tempkin models (R2=0.999 and 0.997 respectively). The results reveal an exceptional removal for the anionic dye (Alizarin Red S.) with a record adsorption capacity of 400 mg·g-1. The significantly high adsorption capacity of UiO-66 towards ARS adds further evidence to the recently reported exceptional performance of MOFs in pollutants removal from water.

关键词: Adsorption, Metal-organic frameworks, Alizarin Red S., Dye removal, UiO-66, Central composite design

Abstract: In order to decisively determine the adsorption selectivity of zirconium MOF (UiO-66) towards anionic versus cationic species, the adsorptive removal of the anionic dyes (Alizarin Red S. (ARS), Eosin (E), Fuchsin Acid (FA) and Methyl Orange (MO)) and the cationic dyes (Neutral Red (NR), Fuchsin Basic (FB), Methylene Blue (MB), and Safranine T (ST)) has been evaluated. The results clearly reveal a significant selectivity towards anionic dyes. Such an observation agrees with a plethora of reports of UiO-66 superior affinity towards other anionic species (Floride, PO43-, Diclofenac sodium, Methylchlorophenoxy-propionic acid, Phenols, CrO42-, SeO32-, and AsO4-). The adsorption process of ARS as an example has been optimized using the central composite design (CCD). The resultant statistical model indicates a crucial effect of both pH and sorbent mass. The optimum conditions were determined to be initial dye concentration 11.82 mg.L-1, adsorbent amount 0.0248 g, shaking time of 36 min and pH 2. The adsorption process proceeds via pseudo-second order kinetics (R2=0.999). The equilibrium data were fit to Langmuir and Tempkin models (R2=0.999 and 0.997 respectively). The results reveal an exceptional removal for the anionic dye (Alizarin Red S.) with a record adsorption capacity of 400 mg·g-1. The significantly high adsorption capacity of UiO-66 towards ARS adds further evidence to the recently reported exceptional performance of MOFs in pollutants removal from water.

Key words: Adsorption, Metal-organic frameworks, Alizarin Red S., Dye removal, UiO-66, Central composite design