Preparation of magnetic PLA-Fe3O4 composite microspheresand its behaviors for adsorption of alizarin red
YANG Ju-xiang1, YAN Xiang-yang2, WANG lü1
（1 School of Chemistry and Chemical Engineering, Xi′an University of Arts and Science, Xi′an 710065, Shaanxi, China;2 College of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi′an 710062, Shaanxi, China）
Abstract:
The magnetic Fe3O4 particles were prepared by co-precipitation method, and modified by sodium oleicate.Using the prepared Fe3O4 pareicles and PLA from disposable tablewares, the magnetic PLA-Fe3O4 composite microspheres were fabricated by using solvent diffuse method. The morphology and composition of the composite microspheres were investigated by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA). The experiments were carried out that the alizarin red pigment was removed from water by the prepared microspheres, the effects of pH, the dosage of the microspheres, the initial concentration of the alizarin red and the time of absorption on the removing efficiency were invistigated. The results show that the optimum conditions are as follows: the pH of solution: 4.3, the amount of the microspheres: 25 mg, the time of absorption: 2 h and the initial concentration of the solution: 19 mg/L.In optimum condition,the removing ratio can reach to 90%.
KeyWords:
magnetic Fe3O4 composite microspheres; polylactic acid (PLA); alizarin red; absorbance; pigment wastewater
