Abstract
A novel sulfhydryl-functional paramagnetic solid-phase adsorbent (HS-M) is constructed based on Ni0.25Zn0.75Fe2O4 microsphere, modified by amino-functional coupling silane (KH-550), cyanuric chloride (TCT) and ethanedithiol (EDT) in turn. The HS-M samples are characterized via a vibration sample magnetism (VSM), an X-ray diffraction instrument (XRD), a scanning electron microscopy (SEM), a transmission electron microscopy (TEM), an energy dispersive spectrometer (EDS), and a Fourier-transform infrared spectroscopy instrument (FT-IR). Some parameters of absorbent properties are investigated, including pH value, adsorption time, ion concentrations, variety of ions, as well as a variety of eluant solutions and desorption time. The HS-M adsorbent presents excellent absorbability on Pb(II) and Hg(II) with the maximum adsorption capacity at 52.78 and 51.32 mg g-1, respectively. The HCl solution (1 mol L−1) is the best suitable eluant solution to regenerate the adsorbent. The as-prepared adsorbent demonstrates excellent reusability whose desorption efficiency remains beyond 92% after five-time recycles. The HS-M adsorbent reaches 58.1% and 47.7% Pb(II) and Hg(II) ions (50 ppm) in a real-water sample, respectively. The HS-M adsorbent is proper in the adsorption of Pb(II) and Hg(II) ions in the various aqueous setting.
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