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In present study, nitrate anion containing CdCr layered double hydroxides (LDH) was synthesized, and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis-differential scanning calorimetry (TGA-DSC) and energy-dispersive X-ray-scanning electron microscopy techniques (EDX-SEM). The characteristic diffraction peaks in the XRD pattern of CdCr-NO3 LDH at 2? values of 15.10 and 26.02° correspond to (003) and (006) planes (hkl), respectively of crystal system of the LDH, revealing layered structure of material with basal (d) spacing of d003: 0.59 nm and d006: 0.34 nm, containing intercalated water and nitrate anions. Stretching vibrations in FT-IR spectrum of the LDH at 3,378.01 and 1,355.51 cm–1 confirmed the intercalation of water and nitrate ions, respectively, in between hydrotalcite-like layers. EDX study confirmed that CdCr-NO3 LDH contained 20.07%, 72.75% and 7.18% of O, Cd(II) and Cr(III), respec-tively. SEM image revealed that nanostructured material is porous and layered in nature. TGA-DSC confirmed the thermal stability of material at below 509.44°C. CdCr-NO3 LDH was investigated as an efficient adsorbent for capturing of Cr(VI) ions form industrial effluents. The adsorption was opti-mized by factorial design approach. Maximum response of CdCr-NO3 LDH for capturing/adsorption of Cr(VI) ions was achieved at optimum concentration of Cr(VI) ions: 10 mg L–1, pH: 4.0, adsorbent amount: 40 mg and shaking time: 30 min at 25°C. Method worked well on real wastewater samples. © 2022 Desalination Publications. All rights reserved. |
