"REUSABLE STARCH-GRAFT-POLYANILINE/Fe3O4 COMPOSITE FOR REMOVAL OF TEXTILE DYES"

Abstract

Magnetic composite materials have been considered as one of the promising candidates for wastewater treatment. In this paper, the starch-g-polyaniline/Fe3O4 (St-PANI/Fe3O4) composite particles were prepared successfully via chemical oxidation polymerization of aniline and starch with ammonium peroxydisulfate as a catalyst. The characterization of prepared composite materials was investigated by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM), and Thermo Gravimetric Analysis (TGA) techniques. The composite materials were used for removal of textile dyes from aqueous solutions. The effect of various factors to adsorption capacities such as initial dye concentrations (50-200 mg/L), adsorbent amount, pH of the medium (3, 5, 7 and 9), and contact times were also investigated. The results showed that these composite materials had the high feasibility removal of anionic dyes, but low efficiency for cationic dyes in an aqueous solution. The absorption yields were strongly affected by the dye concentrations, adsorbent amount, contact time and pH. In addition, the composite can be collected easily from an aqueous solution and recycled after usage with the help of an external magnet due to the magnetic property.

POLYANILINE (PANI)-SENSITIZED Fe3O4/SiO2/TiO2 NANOCOMPOSITES AS PHOTOCATALYST FOR THE REDUCTION OF Au(III) IONS

“…The vibration band at 570 cm -1 shows the Fe-O originated from Fe 3 O 4 and those at 1700 and 1300 cm -1 indicate C=O of free -COOH and -COO -, which interact with Fe. [26][27][28] Asymmetry peak and asymmetry Si-O-Si are shown at 800 and 1080 cm -1 . The absorption band at 940-960 cm -1 shows the binding of Ti by Si-O (Si-O-Ti), and that at 500-700 cm -1 is the fingerprint of Ti-O-Ti.…”