Publication date:
November 2018
Source:Microchemical Journal, Volume 142
Author(s): Zhenzhen Lu, Ruiqin Tan, Weiwei Chu, Shihui Tang, Wei Xu, Weijie Song
Strontium hydrogen phosphate/Fe3O4 magnetic nanocomposite (M-SrHPO4) was successfully synthesized using a facile method of solution growing and applied to immobilize lead ions (Pb
2+) from acidic aqueous solutions. M-SrHPO4 was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Brunauer Emmett Teller (BET) and physical property measurement system (PPMS). The resulting M-SrHPO4 possessed desirable magnetic property (25.214 emu·g
−1), which contributed to the separation of solids from solutions after the immobilization process. The equilibrium removal capacity was 1215.5 mg·g
−1 for Pb
2+ at PH = 4.5 within 150 min. The selective immobilization of Pb
2+ was slightly affected by some competing cations such as Cr
3+, Cd
2+, Co
2+ and Cu
2+. It is revealed that the immobilization mechanism of Pb
2+ was based on dissolution-precipitation theory. All of the experimental data indicated that M-SrHPO4 was promising for Pb
2+ removal from acidic aqueous solutions.