Polyaniline (PANI) and humic acid (HA) composite sorbents were prepared by adding different amount of HA into the chemical oxidation process of PANI. The sorbents were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and N2 adsorption and desorption. Batch adsorption results showed that the sorbent PANI/HA-1 had the best affinity to Cr(VI) in aqueous solution. The adsorption kinetics results of Cr(VI) indicated that the adsorption reached equilibrium within 120 min, and adsorption rate could be described by pseudo second order kinetics. Sorption of Cr(VI) onto PANI/HA-1 fitted the Freundlich adsorption model better than the Langmuir adsorption model. The results of zeta potential measurement and batch experiments showed that the PANI/HA-1 was stable in the pH range of 4–7. The desorption results indicated NaOH eluent had better desorption rate than HCl eluent. The electrochemical-controlled desorption result showed that the loaded Cr(VI) on the PANI/HA-1 could be removed from the matrix, although the desorption rate was not as high as using the eluents. An adsorption mechanism was proposed on the basis of X-ray photoelectron spectroscopy (XPS) and zeta potential measurement results.
No takes yet. Share an insight, caveat, or question.
Ya et al. (2011) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: