Facile Synthesis of Phytic Acid Impregnated Polyaniline for Enhanced U(VI) Adsorption

Abstract

A novel phytic acid impregnated polyaniline (PA-PANI) was synthesized by a in situ polymerization and supermolecular self-assembly method and has been used as an adsorbent for efficient capture of U(VI) from aqueous solution. The structure and morphology of the adsorbent were well characterized. The influence of different factors such as pH value, ionic strength, contact time, initial U(VI) concentration and temperature on the adsorption of U(VI) onto PA-PANI-3 were carried out by batch adsorption experiments. The results demonstrated an enhanced U(VI) adsorption capacity of 86.6 mg/g for PA-PANI-3, greatly exceeding that of polyaniline (PANI, 8.8 mg/g). The adsorption process follows the pseudo-secondorder kinetic and Langmuir isotherm models with the theoretical maximum adsorption capacity of 90.3 mg/g. According to the calculation from the Dubinin−Radushkevich isotherm model equation, it is suggested that the adsorption is mainly a chemical adsorption mechanism. U(VI) is adsorbed on PA-PANI-3 via the phosphoric acid, amine, and imine groups. The U(VI) can be desorbed from the U(VI) adsorbed PA-PANI-3 with a desorption efficiency of 90.8% by using 0.1 mol/L Na 2 CO 3 solution. This study demonstrated that PA-PANI could be used as an efficient adsorbent for removal and recovery of U(VI) from aqueous solution.

Phytic acid-doped poly-N-phenylglycine potato peels for removal of anionic dyes: investigation of adsorption parameters

“…For example, phytic acid-doped polyaniline (PANi), prepared by in situ polymerization, was investigated for the removal of U 6+ . 20 The phytic acid-doped PANi has proven to be a promising candidate for the uptake of U 6+ .…”

Effect of structural factors on the physicochemical properties of functionalized polyanilines

“…205 Along with the properties mentioned above, polyaniline derivatives have good adsorption ability that was successfully applied in the eld of water purication from various dyes. [207][208][209][210] The phenomenon of adsorption of a paint pigment on the polymer was explained by a change in the surface charge upon protonation of the amine group in PANI derivatives 207 which allows one to achieve a high degree of adsorption of both cationic and anionic dyes. The high adsorption efficiency is probably due to a higher porosity or a large number of active binding sites, which results in improved ion exchange properties and favors the absorption of a dye molecule.…”

“…The high adsorption efficiency is probably due to a higher porosity or a large number of active binding sites, which results in improved ion exchange properties and favors the absorption of a dye molecule. [208][209][210]…”

Phytic Acid Doped Polyaniline as a Binding Coating Promoting Growth of Prussian Blue on Cotton Fibers for Adsorption of Copper Ions

“…Therefore, the adsorption affinity of PANI would be further increased by incorporating PA molecules. For this reason, the doping of PA would be beneficial for enhancing the adsorption ability of PANI for metal ions [41][42][43]. With the assistance of PA, the acidic environment for the polymerization of aniline (ANI) was created and the PANI molecular chains were doped, PANI particles were coated in situ on CFs, which increased the specific surface area and active sites of CFs.…”