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Surface investigations of selective biosorption and reduction of hexavalent chromium ions Cr(VI) over chitosan@MoO 3 and chitosan-cellulose@MoO 3 biocomposite.

Journal of Molecular Structure, ISSN: 0022-2860, Vol: 1288, Page: 135716
2023
  • 7
    Citations
  • 0
    Usage
  • 13
    Captures
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    7
    • Citation Indexes
      7
  • Captures
    13

Article Description

Herein we synthesized two novel chitosan-based bicomposites namely chitosan@ MoO 3 (Ch@MoO 3 ) and chitosan-cellulose @ MoO 3 (Ch-CS@MoO 3 ) to detoxify water polluted with hexavalent chromium through adsorption reduction technology. The bicomposites were characterised using XPS, FT-IR, SEM, EDS, XRD, TGA, BET and DLS. XPS results suggested that Cr(VI) detoxification occurs through the electrostatic attraction and chemical bonding of Cr(VI) to the surface functional groups (Mo 6+, -NH 2+, -OH + ) followed by reduction of Cr(VI) to Cr(III). FT-IR revealed changes in the surface functional groups after adsorption. XRD showed a successful incorporation of MoO 3 into chitosan matrix. The surface texture of Ch@MoO 3 was homogeneous with small spherical shape while Ch-CS@MoO 3 exhibited a rough and dense fiber-like structure as evidenced by SEM characterization. N 2 adsorption-desorption isotherm displayed H 3 -type hysteresis loop and a pore size diameter of 16.4 nm and 14.3 nm for the Ch@MoO 3 & Ch-CS@MoO 3 respectively. Adsorption capacity (Q max ) values were 128.2 and 52.3 mg/g for Ch@MoO 3 and Ch-CS@MoO 3 respectively. The metal surface coverage mapping was 5.4 × 10 23 and 3.9 × 10 20 atoms/m 2 for Ch@MoO 3 and Ch-CS@MoO 3 respectively. Adsorption followed Langmuir isotherm and pseudo-second-order (PSO) kinetics, indicating monolayer chemisorption dominance. The intraparticle diffusion (IPD) model demonstrated a boundary layer control. Thermodynamically, both bicomposites exhibited spontaneous and endothermic biosorption nature.

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