Sorption behavior of methyl orange from aqueous solution on organic matter and reduced graphene oxides modified Ni–Cr layered double hydroxides

Nickel chromium layered double hydroxides (LDH) modified by reduced graphene oxide (RGO-Ni-Cr-CO sub(3) LDH), sodium dodecyl benzene sulfonate (Ni-Cr-DBS LDH), laurate (Ni-Cr-Laurate LDH) as well as the typical carbonate-intercalated Ni-Cr LDH (Ni-Cr-CO sub(3) LDH) were synthesized by co-precipitati...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2016-08, Vol.297, p.295-303
Main Authors: Ruana, Xiuxiu, Chena, Yuhan, Chena, Hua, Qiana, Guangren, Frostb, Ray L
Format: Article
Language:English
Subjects:
Adsorption
Dyes
Graphene
Hydroxides
Mathematical models
Nickel
Sorption
Surface chemistry
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Summary:Nickel chromium layered double hydroxides (LDH) modified by reduced graphene oxide (RGO-Ni-Cr-CO sub(3) LDH), sodium dodecyl benzene sulfonate (Ni-Cr-DBS LDH), laurate (Ni-Cr-Laurate LDH) as well as the typical carbonate-intercalated Ni-Cr LDH (Ni-Cr-CO sub(3) LDH) were synthesized by co-precipitation method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and elemental analysis (EA). The results of the batch sorption and recycle experiments of Ni-Cr LDHs towards methyl orange (MO) show the great potential of three modified Ni-Cr LDHs as good sorbents. The adsorption kinetics curves of MO onto the Ni-Cr LDHs were better described by the pseudo-second-order model than pseudo-first-order. The adsorption capacity follows the order of Ni-Cr-DBS LDH > Ni-Cr-Laurate LDH > RGO-Ni-Cr-CO sub(3) LDH >> Ni-Cr-CO sub(3) LDH. Sorption isotherms of the inorganic LDHs (RGO-Ni-Cr-CO sub(3) LDH and Ni-Cr-CO sub(3) LDH) are Langmuir type, while LDHs intercalated with organic molecules fitted well with Freundlich type. Greater sorption of MO on RGO-Ni-Cr-CO sub(3) LDH is attributed to the large specific area and the bridge of RGO and MO in the presence of heavy metals. The partition into the interlay organic phase formed by organic anions (DBS or laurate), and the adsorption onto the external surface of LDHs may dominated the progress of MO sorption on Ni-Cr-DBS LDH and Ni-Cr-Laurate LDH. The regeneration results showed the as-modified Ni-Cr LDHs could be regarded as a promising adsorbent for the removal of anionic dyes in wastewaters.
ISSN:1385-8947
DOI:10.1016/j.cej.2016.01.041