Abstract
Lead ion (Pb2+) has high toxicity and brings great harm to human body. It is very important to find an effective method to address lead ion pollution. In this work, amino functionalized CoFe2O4/SBA–15 nanocomposite (NH2–CoFe2O4/SBA–15) was prepared for the effective removal of Pb2+ from aqueous solution. The prepared NH2–CoFe2O4/SBA–15 adsorbent was manifested by using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectrum (FTIR), X-ray powder diffraction (XRD), and Brunauer-Emmett-Teller (BET) analysis. In the meantime, the adsorption conditions, including pH, adsorbent dosage, and adsorption time, were studied. The investigation of adsorption kinetics revealed that the adsorption results conform to the pseudo-first-order kinetic model. The adsorption isotherms research displayed that the adsorption was consistent with the Freundlich model, demonstrating that the adsorption for Pb2+ with the prepared adsorbent was a multimolecular layer adsorption process. In addition, the thermodynamic investigations (ΔG < 0, ΔH > 0, ΔS > 0) demonstrated that the adsorption for Pb2+ with the prepared adsorbent was endothermic and spontaneous. Moreover, the prepared adsorbent showed superior anti-interference performance and reusability, implying the potential application of the adsorbent in actual water treatment. Furthermore, this research may provide a reference and basis for the study of other heavy metal ions.
Highlights
Published: 11 September 2021In the process of industrial production, the substandard discharge of wastewater releases a variety of heavy metal ions into the natural environment
We mainly investigated the effect of pH toward the adsorption of
Is an empirical related to the thethe intensity of binding adsorption, which varies with the heterogeneity of parameter the adsorbent
Summary
In the process of industrial production, the substandard discharge of wastewater releases a variety of heavy metal ions into the natural environment. A great quantity of heavy metal ions become one of the main environmental pollutants [1,2]. A molecular sieve is a kind of material with large surface area. Properties, pore sizeisdistribution, and easy to achieve modification, auniform molecular sieve a kind of adsorbing material withchemical great potential. SBA−15 bent [33,34], we prepared the magnetic molecular sieve adsorbent by compositing SBA–15 and magnetic CoFe2O4, which could be separated well from water through an external and magnetic CoFe2 O4 , which could be separated well from water through an external magnetic field. To improve the adsorption capacity of the adsorbent, the surface of the prepared CoFe2O4/SBA−15 nanocomposite was aminated to enhance the complexation prepared CoFe2 O4 /SBA–15 nanocomposite was aminated to enhance the complexation ability toward heavy metal ions.
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