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

摘要: Abstract Nickel chromium layered double hydroxides (LDH) modified by reduced graphene oxide (RGO–Ni–Cr–CO 3 LDH), sodium dodecyl benzene sulfonate (Ni–Cr–DBS laurate (Ni–Cr–Laurate LDH) as well the typical carbonate-intercalated Ni–Cr LDH (Ni–Cr–CO were synthesized co-precipitation method and characterized X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) elemental analysis (EA). The results of batch sorption recycle experiments LDHs towards methyl orange (MO) show great potential three good sorbents. adsorption kinetics curves MO onto better described pseudo-second-order model than pseudo-first-order. capacity follows order Ni–Cr–DBS LDH > Ni–Cr–Laurate LDH > RGO–Ni–Cr–CO LDH >> Ni–Cr–CO LDH. Sorption isotherms inorganic Ni–Cr–CO are Langmuir type, while intercalated with organic molecules fitted Freundlich type. Greater on RGO–Ni–Cr–CO is attributed to large specific area bridge RGO in presence heavy metals. partition into interlay phase formed anions (DBS or laurate), external surface may dominated progress Ni–Cr–Laurate regeneration showed as-modified could be regarded a promising adsorbent for removal anionic dyes wastewaters.