Green cross-linked bionanocomposite of magnetic layered double hydroxide/guar gum polymer as an efficient adsorbent of Cr(VI) from aqueous solution. (15th May 2020)

• Record Type: Journal Article
• Authors: Dinari, Mohammad; Shirani, Mohammad Ali; Maleki, Mohammad Hassan; Tabatabaeian, Reyhane
• Is Part Of: Carbohydrate polymers. Volume 236(2020)
• Publication Date: 2020-05-15
• Subjects: Guar gum -- Biopolymer -- Magnetite nanoparticles -- Layered double hydroxide -- Nanocomposite; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116070
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Fe3 O4 @LDH @GG bionanocomposite (MLG BNC) was prepared by a facile and green method. MLG BNC was used for removal of toxic Cr(VI) from aqueous solution. The maximum Cr(VI) adsorption capacity of the MLG6% at pH 6 in 30 min was 101 mg g −1 . This BNC is a possible candidate for consideration as effective sorbents for Cr(VI) removal from solution. Abstract: A novel bio-adsorbent based on guar gum (GG) was synthesized through the cross-linked polymerization of N, N' -methylene bis-acrylamide (MBA) onto Fe3 O4 @ nickel aluminum layered double hydroxide (Ni/Al LDH) @ GG bionanocomposite (BNC) using an in situ growth method. The structural, thermal, and morphological properties of the MLG BNC were studied by different techniques. According to field emission scanning electron microscopy, and transmission electron microscopy, there is a uniform distribution of nanoparticles with a particle size of 40−50 nm in the nanocomposite. MLG BNC was used as Cr (VI) adsorbent, and the effect of pH, concentration, and contact time on adsorption capacity was determined. It was observed that the maximum Cr(VI) adsorption by MLG was 101 mg g −1 (pH 6, 30 min). The adsorption isotherm was represented the single-layer, and homogeneous adsorption and the high value of R 2 illustrates a good agreement with Langmuir. The adsorption kinetic was the second-order pseudo-model.