Synthesis of magnetite-doped Ni–Al layered double hydroxide nano-particles: Application to the speciation of manganese in water samples

Fe3O4-doped Ni–Al layered double hydroxide (LDH) was synthesis by a simple method. A novelmagnetic solid phase extraction method was developed for the speciation of Mn(II)/Mn(VII) in aqueous solutionsutilizing the synthesized nano-hybrid as a nano-sorbent. The method is based on the separation and preconcentrationof Mn(VII) by Fe3O4/Ni–Al LDH nano-hybrid at pH 6.0 prior to determination by flame atomicabsorption spectrometry (FAAS). Total manganese was determined after the reduction of Mn(II) to Mn(VII) byacidic solution of KIO4. The analytical parameters including pH, amount of nano-sorbent, sample volume andelution conditions were investigated for the quantitative recoveries of Mn(VII). The presented method wasvalidated by the analysis of a certified reference material, and applied to the speciation of Mn in water samples

کلیدواژه ها:

Layered double hydroxide ، Magnetic solid phase extraction ، Speciation ، Manganese