Abstract
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 ([Formula: see text]), MO adsorption onto Pan/MHT was well described by Freundlich isotherm ([Formula: see text]), and the MO adsorption capacity of 2 Pan/MHT obtained the highest with [Formula: see text]. 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 m2/g). The superparamagnetic behavior of Pan/MHT (with[Formula: see text], [Formula: see text], and[Formula: see text]) 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 [Formula: see text]
Highlights
Dyes are widely used in many fields, such as textile, cosmetic, pigment, paper industry, dyeing, or tanning industry
The mechanism of methyl orange (MO) adsorption onto Pan/magnetic Fe3O4/HT nanocomposites (MHT) composite is either of the surface adsorption or other types of interactions, such as electrostatic interaction, ion exchange, hydrogen bonding, and van der Waals forces
All Pan/ MHT composites were characterized by analyzing methods of scanning electron microscopy (SEM), Fourier transform infrared (FT−IR), XRD, BET, and vibration sample magneparameter (VSM) and studying for MO adsorption
Summary
Dyes are widely used in many fields, such as textile, cosmetic, pigment, paper industry, dyeing, or tanning industry. MO, amaranth (Am), diamine green B (DGB) and brilliant green (BG), and acid orange (AO) by surface adsorption, interlayer anion exchange, restructuration of calcined HT, and anion exchange [40,41,42] Both polyaniline (Pan) and HT have high adsorption capacity and have been widely used in water treatment. The fast charge generation and slow charge recombination lead to enhanced photo catalytic activity Both Pan and MHT have high efficiency in the removal of azo dye. The structure of the hydroxide porous layer and the ability to exchange ions in MHT combined with Pan will give good capacitive properties and high environmental sustainability, because of the special structure that induces ion exchange, restructuration, and the large surface area, so that Pan/MHT can “trap” the MO dye molecules into its structure, recover MO molecules, and remove them from wastewater. We studied the effect of contact time, pH, and adsorbent dose onto the adsorption capacity of MO in water
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