Adsorptive removal of Cd(II) from contaminated water via hexavalent molybdenum-containing layered double hydroxide: Ni/Mo-LDH

ABSTRACT

This article states the first application of nickel/molybdenum-layered double hydroxide (LDH) as a new adsorbent for the removal of cadmium ions [Cd(II)] from aqueous solutions. The essential structure of Ni/Mo-LDH of di and hexavalent cations was elucidated by X-ray photoelectron spectroscopy, X-ray diffraction, and Fourier transmission infrared spectroscopy. The maximum adsorption capacity of adsorbent is 53.6 mg g⁻¹ at a temperature of 298 K, pH of 5.5, mass of 0.5 g L⁻¹, time of 105 min, and initial concentration of 175 mg L⁻¹. This adsorbent was distinguished by self and fast separation from adsorption media due to its layered, mesoporous structure and the presence of hexavalent molybdenum cation.

KEYWORDS:

• Cd(II) adsorption
• nanoparticles
• Ni/Mo-LDH
• XPS
• water treatment