In order to recycling adsorbent of wastewater, magnetic adsorbents with recycling properties were prepared by fly ash magnetic powder (CMS)-doped polyaniline microfiber composites (CMS/PANI microfiber). The cheap fly ash magnetic powder is obtained from industrial solid waste fly ash. XRD patterns of CMS/PANI microfiber shows that the peaks at 30o are corresponding to the magnetite in CMS. SEM images shows that CMS/PANI fibrous winding structures forming a porous cage, where microfiber have the diameter of 60 nm and the length of 2-3 um. EDS spectra indicated that the magnetic dots monodispersed on the surface of every root of microfiber. BET surface areas of PANI microfiber and CMS/PANI microfiber are 36.42 m2/g and 25.75 m2/g, respectively. The different wastewater samples has been used including congo red(CR), methyl orange(MO) and halogenated element ions solutions. The maximum adsorption amounts of CR and MO were 324.68 mg/g and 212.3 mg/g, respectively. Interestingly, the CMS/PANI nanofibre material still adsorbs very well to other ionic wastewaters. The magnetic adsorbent achieves a sorption rate of 70% for Ca2+ containing wastewater under certain conditions. The magnetic adsorbent exhibited 48% adsorption of Cl- and over 90% adsorption of F-, Br- and I-. After six cycles of magnetic separation, the adsorption rate was still above 96%. The adsorption curves and equation fits show that the adsorption process is consistent with the langmuir isotherm model and the quasi-secondary kinetic model.
Magnetic polyaniline nanofibers were synthesized by oxidative polymerization using protonic acid and fly ash magnetic beads as dopants and ammonium persulfate as oxidant. The synthesized magnetic polyaniline was characterized by FT‐IR, UV, XRD and SEM, and its morphology and structure were revealed. Polyaniline magnetic electrodes were prepared by pressing method, and their electrochemical properties were analyzed by cyclic voltammetry and constant current charge–discharge methods. The capacities of polyaniline powders doped with optimal concentration of hydrochloric acid and p‐toluene sulfonic acid at current density of 1 A/g were 250.75 and 410.5 F/g, respectively. The magnetic polyaniline doped with optimal acid concentration has good conductivity through impedance measurement analysis. A smooth and uniform film was prepared by pressing magnetic polyaniline powder and its photosensitivity was observed under different monochromatic illumination. The results show that the current and voltage have a linear relationship and that different monochromatic light energies can be distinguished significantly with the increase of voltage.
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