Amine functionalized magnetic carbon nanotube: synthesis and binary system dye removal

In this paper, the amine functionalized magnetic carbon nanotube (AFMCNT) was synthesized and used to remove anionic dyes from single and binary systems. The characteristics of AFMCNT were investigated using Fourier transform infrared and scanning electron microscope. Acid Blue 92 (AB92), Acid Red 14 (AR14), and Direct Red 31 (DR31) were used as anionic dyes. The effect of operational parameters (AFMCNT dosage and pH) on dye removal was investigated. The adsorption isotherm and kinetics were studied. The isotherm data in single and binary systems followed Langmuir isotherm. The maximum adsorption capacity (Q(0)) of AB92, AR14, and DR31 was 333, 370, and 323mg/g, respectively. Dye adsorption kinetics in single and binary systems followed pseudo-second-order kinetics model. The results showed that AFMCNT was an effective adsorbent to remove cationic dyes from binary systems.