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Adsorption removal of o-nitrophenol and p-nitrophenol from wastewater by metal-organic framework Cr-BDC

In the present paper, a metal-organic framework Cr-BDC was prepared and used as adsorbent for adsorption ofo-nitrophenol (ONP) and p-nitrophenol (PNP) from aqueous solutions. Cr-BDC was characterized by scanningelectron microscopy, transmission electron microscope, X-ray diffraction and BET methods....

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Bibliographic Details
Published in:Chinese journal of chemical engineering 2017-06, Vol.25 (6), p.775-781
Main Authors: Chen, Jianhua, Sun, Xue, Lin, Lijing, Dong, Xinfei, He, Yasan
Format: Article
Language:English
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Summary:In the present paper, a metal-organic framework Cr-BDC was prepared and used as adsorbent for adsorption ofo-nitrophenol (ONP) and p-nitrophenol (PNP) from aqueous solutions. Cr-BDC was characterized by scanningelectron microscopy, transmission electron microscope, X-ray diffraction and BET methods. The results indicatethat Cr-BDC gets a very large specific surface area of4128 m2·g^-1 and pore sizes are concentrated in I nm, whichis a benefit for using for wastewater treatment, The influences of the adsorption conditions, such as temperature,solution concentration, adsorption time and reusability on adsorption performance were investigated. Cr-BDCexhibited an encouraging uptake capacity of 310.0 mg·g^-1 for ONP, and adsorption capacity of Cr-BDC forONP is significantly higher than that for PNP under suitable adsorption conditions. The characterizations ofadsorption process were examined with the Lagergren pseudo-first-order, the pseudo-second-order kineticmodel, and the intra-particular diffusion model. Kinetics experiments indicated that the pseudo-second-ordermodel displayed the best correlation with adsorption kinetics data. Furthermore, our adsorption equilibriumdata could be better described by the Freundlich equation. The results indicate that the as-prepared Cr-BDC ispromising for use as an effective and economical adsorbent for ONP removal.
ISSN:1004-9541
2210-321X
DOI:10.1016/j.cjche.2016.10.014