Lead pollution has became one of the most critical environmental problems because of its high physiological toxicity. The adsorption process is widely used to remove lead. In the present work, core-shell porphyrin-based magnetic nanocomposites (FST) were successfully synthesized and employed as adsorbent for removing lead(II) from aqueous solution. The FST magnetic nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTIR), vibrating sample magnetometry (VSM) and ultraviolet visible spectroscopy (UV-vis). The adsorption property of FST for removal of lead(II) was investigated by various experimental conditions, including initial lead(II) concentration, contact time and experimental temperature. The adsorption mechanisms were studied by FE-SEM, UV-vis and X-ray diffraction. According to the results of the adsorption experiments, the adsorption equilibrium can be reached in a short time of 5 min, and the adsorption processes can be described well with pseudo-second-order kinetic model regardless of the initial lead(II) concentration. The adsorption thermodynamics, isotherms and mechanisms were various with the initial lead(II) concentration. When the initial lead(II) concentration was 12.8 mg/L, the adsorption process was an endothermic and a favorable monolayer interaction, and controlled by the complexation between lead(II) and porphyrin. When the initial lead(II) concentration was 19.2-512 mg/L, the adsorption processes were exothermic interactions (experimental temperature was from 293.15 K to 323.15 K), and controlled by multilayer adsorption, crystallization and limiting solubility.

Core-shell porphyrin-based magnetic nanocomposites for efficient adsorption and removal of lead(II) in aqueous solution

256th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.