Enhanced adsorption of Cd(II) using a composite of poly(acrylamide-co-sodium acrylate) incorporated LDH@MoS24

Mei Yang, Liang Peng*, Anwei Chen, Qingru Zeng, Jihai Shao, Si Luo, Jidong Gu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The Mg/Al layered double hydroxide (Mg/Al-LDH) intercalated with the MoS2−4 (MoS4-LDH) impregnated into poly(acrylamide-co-sodium acrylate) (PP) was synthesized as layered double hydroxides-PP (LDHS-PP), whose characterization, adsorption properties and mechanisms were investigated. The maximum adsorption capacity (qm) for Cd(II) was ∼2789.58 mg/g by 1% LDHS-PP, while it was ∼1893.09 mg/g by PP, which indicated that the MoS4-LDH greatly improved the Cd(II) uptake for PP in aqueous solution. In strongly acidic conditions (∼pH 3.0), there was still a good removal efficiency of about 45.65% by the 1% LDHS-PP, while that of PP was almost zero. At pH 5.0 the removal efficiency increased to 85.17% by the 1% LDHS-PP. The sorption kinetics for the 1% LDHS-PP was described well by a pseudo-second-order kinetic model. X-ray photoelectron spectrometry (XPS) and elemental distribution maps further confirmed the presence of MoS4-LDH in the PP and most of the Cd(II) chemisorption based on the Cd-S bonding. Due to its high removal efficiency and acid resistance, LDHS-PP is a promising in-situ fixation agent for the remediation of agricultural soil polluted with Cd(II) at low pH.

Original languageEnglish
Pages (from-to)357-365
Number of pages9
JournalEnvironmental Technology (United Kingdom)
Volume41
Issue number3
DOIs
StatePublished - 28 Jan 2020

Keywords

  • Mg/Al-layered double hydroxide
  • MoS
  • Polymer
  • acid resistance
  • cadmium

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