A novel magnetic nanomaterial (Fe 3 O 4 -g-C 3 N 4 ) based on Fe 3 O 4 nanoparticles anchored on g-C 3 N 4 was synthesized by a facile ultrasonic method and characterized by various means, including scanning electron microscopy, X-ray diffraction, vibrating sample magnetometer (VSM), Fourier transform infrared, thermogravimetric analysis, and particle size analyzer. Fe 3 O 4 -g-C 3 N 4 was used as an magnetic adsorbent to remove Cd(II), Pb(II), and Zn(II) from aqueous solutions. Langmuir model was investigated to be the best one for fitting isothermal adsorption equilibrium data, and the corresponding adsorption capacities were predicted to be 168.93, 189.36, and 281.28 mg/g for Cd(II), Pb(II), and Zn(II), respectively. The X-ray photoelectron spectroscopy results revealed that the good adsorption ability of Fe 3 O 4 -g-C 3 N 4 originated from the conjugation effect between Fe 3 O 4 -g-C 3 N 4 and metal ions. All these results show the Fe 3 O 4 -g-C 3 N 4 as one of potential adsorbents in removing Cd(II), Pb(II), and Zn(II) from wastewater.

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A new type of magnetic adsorbent was prepared using a simple one-step synthesis for the removal of Zn(Ⅱ) and Cd(Ⅱ) from aqueous solution. Structure characterization demonstrated that the surface of the magnetic nanoparticles (MNPs) had been modified by L-arginine. Factors that affect the adsorption of Zn(Ⅱ) and Cd(Ⅱ) onto the MNPs modified with L-arginine (MNPs-L), such as pH, ionic strength, initial concentration, contact time, temperature, and compete adsorption, were investigated. The adsorption kinetic data followed the pseudo-second-order model (PSOE) and the intra particle diffusion model (IPD). Isotherm data demonstrate that the Langmuir absorption model was the best-suited model for this research, and the calculated maximum adsorption capacities of Zn(Ⅱ) and Cd(Ⅱ) were 150.4 mg/g and 120.2 mg/g, respectively. Thermodynamic parameters indicated a spontaneous and endothermic adsorption process. In addition, regeneration studies suggested that MNPs-L were stable. Thus, MNPs-L could be a promising material for removing Zn(Ⅱ) and Cd(Ⅱ) from wastewater.