Abstract:
Clay mineral (montmorillonite) based nanocomposites was modified their surface functional groups for removal
of Pb(II) and As(V) of aqueous solution. Magnetic nanoparticles with an amine functionalized surface (MH) were
successfully synthesized onto the surface layer of montmorillonite (Mt) as an organomodified mineral solid via
one-pot solvothermal reaction. The synthesis of amino magnetic nanoparticles coated montmorillonite (Mt@
MH) was carried out by one-pot solvothermal reaction of 1,6-hexanediamine, iron(III) chloride hexahydrate and
Mt in ethylene glycol at ± 198 °C for 6 h. The MH nanoparticles with diameter size around 30–50 nm were
obtained. Characterizations were performed using powder X-ray diffraction (XRD), field-emission scanning
electron microscopy (FE-SEM), superconducting quantum interference device (SQUID), and Fourier transform
infrared spectroscopy (FT-IR) analysis. The insertion of MH onto the surface layer of Mt does not only serve as an
easily retrievable adsorbent but also provide a high adsorption capacity towards Pb(II) and As(V) ion. The
adsorption isotherms of Pb(II) and As(V) at room temperature were well-fitted with Langmuir model providing
maximum adsorption capacity for Pb(II) and As(V) of 38.15 mg/g at pHe˜6.5 and 19.10 mg/g at pHe˜3.5, re spectively. The Mt@MH showed 2-fold higher adsorption capacity than MH and Mt. It is due to surface func tionalization with the amine group (6 mmol/g) on the adsorbent. The electrostatic interaction was proposed as
the primary driving forces for Pb(II) and As(V) adsorption onto the Mt@MH
