Preparation of Magnetic Composite Polyaniline/Fe3O4-Hydrotalcite and Performance in Removal of Methyl Orange

Magnetic composite fabricated from polyaniline and Fe3O4-hydrotalcite (Pan/MHT) was successfully applicated for removal of methyl orange (MO) from wastewater. The structure and properties of Pan/MHT were characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, vibrating sample magnetometer, and Brunauer-Emmett-Teller adsorption isotherm. Adsorption kinetic results indicated that the adsorption process followed pseudosecond-order kinetic model (R-2=0.999), MO adsorption onto Pan/MHT was well described by Freundlich isotherm (R-2=0.994), and the MO adsorption capacity of 2 Pan/MHT obtained the highest with Q(e)=156.25 mg/g. Batch adsorption experiments were carried out using magnetic composite with the effects of initial MO concentration, solution pH, and adsorbent dosage. The results revealed that the magnetic Pan/MHT exhibited efficient adsorption of MO in the aqueous solution as a result of the affinity for organic dyes, microporous structure, and suitable surface area for adsorption (15,460 m(2)/g). The superparamagnetic behavior of Pan/MHT (withH(c)=18.56 Oe, M-s=23.38x10(-3) emu/g, andM(r)=0.91x10(-3) emu/g) helps that it could be separated from the solution and performs as an economical and alternative adsorbent to removal and degrade azo dye from wastewater. Pan/MHT was also investigated to reuse after desorption of MO in 0.1 M HCl, and the results show that 2 Pan/MHT can be reused for 4 cycles with Q(e)=79.66 mg/g.