期刊
APPLIED SURFACE SCIENCE
卷 436, 期 -, 页码 198-206出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2017.12.029
关键词
Alizarin red S; Alizarin yellow R; Adsorption; Pentaerythritol; Multi-walled carbon nanotubes
类别
资金
- National Natural Science Foundation of China [51674292, 21471163]
- Provincial Natural Science Foundation of Hunan [2016JJ1023]
- Project of Innovation-driven Plan in Central South University [2016CX007]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007]
A contrastive work on the removal of two organic dyes, alizarin yellow R (AYR) and alizarin red S (ARS), was carried out by utilizing pentaerythritol modified multi-walled carbon nanotubes (ox-MWCNT-PER) as a highly efficient adsorbent. Various characterization methods such as scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, the Brunauer-Emmett-Teller (BET) analysis and X-ray photoelectron spectroscopy (XPS), were applied for revealing the physical and chemical properties of the as-prepared material. In addition, the adsorption kinetics, isotherms and thermodynamic parameters were also discussed. The results showed that the time required to achieve the adsorption equilibrium for both dyes was about 30 min, and the increase in temperature was not favorable to the adsorption process. It was worth noting that the adsorption capacity of ox-MWCNT-PER towards ARS dye was more significant than that towards AYR dye. And the maximum adsorption capacities for ARS and AYR were 257.73 mg g(-1) and 45.39 mg g(-1), respectively. The possible adsorption mechanism was also proposed, and the synergistic effects of the hydrogen bonding and the pi-pi electron stacking interactions between the adsorbents and adsorbates both contributed to the adsorption. It could be proposed that the ox-MWCNT-PER nanocomposite might have some positive effects in removing organic dyes from water treatment in the future. (C) 2017 Elsevier B.V. All rights reserved.
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