Enhanced adsorption of Cd(II) using a composite of poly(acrylamide-co-sodium acrylate) incorporated LDH@MoS24−. Issue 3 (28th January 2020)

• Record Type: Journal Article
• Authors: Yang, Mei; Peng, Liang; Chen, Anwei; Zeng, Qingru; Shao, Jihai; Luo, Si; Gu, Jidong
• Is Part Of: Environmental technology. Volume 41:Issue 3(2020)
• Page Start: 357
• Page End: 365
• Publication Date: 2020-01-28
• Subjects: Polymer -- MoS42− -- Mg/Al-layered double hydroxide -- acid resistance -- cadmium; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2018.1498922
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: The Mg/Al layered double hydroxide (Mg/Al-LDH) intercalated with the MoS 4 2 − (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 ( q m ) 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. GRAPHICAL ABSTRACT: