Single step modification of micrometer‐sized polystyrene particles by electromagnetic polyaniline and sorption of chromium(VI) metal ions from water

Abstract

This article describes a single‐step reproducible approach for the surface modification of micrometer‐sized polystyrene (PS) core particles to prepare electromagnetic PS/polyaniline–Fe3O4 (PS/PANi–Fe3O4) composite particles. The electromagnetic PANi–Fe3O4 shell was formed by simultaneous seeded chemical oxidative polymerization of aniline and precipitation of Fe3O4 nanoparticles. The weight ratio of PS to aniline was optimized to produce core–shell structure. PS/PANi–Fe3O4 composite particles were used as adsorbent for the removal of Cr(VI) via anion‐exchange mechanism. The composite particles possessed enough magnetic property for magnetic separation. The adsorption was highly pH dependent. Adsorption efficiency reached 100% at pH 2 in 120 min when 0.05 g of composite particles was mixed with 30 mL 5 mg L−1 Cr(VI) solution. The adsorption isotherm fitted best with Freundlich model and maximum adsorption capacity approached 20.289 mg g−1 at 323 K. The prepared composite was found to be an useful adsorbent for the removal of soluble Cr(VI) ions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47524.

Effective Adsorption of Hexavalent Chromium and Divalent Nickel Ions from Water through Polyaniline, Iron Oxide, and Their Composites

“…This is in correlation with the previously reported work, which explain that for physical adsorption, the values of Gibb's free energy should range from −20 to zero kJ•mol −1 , but when these values are more than this limit, the adsorption will be chemical [80]. Similarly Debnath et al demonstrated that if the values of enthalpy change range from 84 to 420 kJ•mol −1 , the adsorption will be chemical while when values of enthalpy change less than 84 kJ•mol −1 it indicates physical adsorption [83]. Besides these properties, activation energy also indicates the chemical and physical nature of adsorption.…”

Removal and Separation of Heavy Metal Ions from Multicomponent Simulated Waters Using Silica/Polyethyleneimine Composite Microparticles

“…In many countries, there is a growing need for development of more efficient materials for water treatment and purification technologies (chemical precipitation, flocculation, reverse osmosis, solvent extraction, sorption, membrane processes, exchange of ions, etc. ). − For instance, Humelnicu et al showed that every material which contains donor atoms (N, S, O, P, etc.) could interact with heavy metals; therefore, they could be used as sorbents, the heavy metal sorbed amounts (tens to hundreds mg per gram sorbent) being strongly influenced by accessibility of these atoms, which act as ligands for the central heavy metal ion .…”

Highly Efficient Adsorption and Reduction of Cr(VI) Ions by a Core–Shell Fe3O4@UiO-66@PANI Composite

“…High temperature was favorable for the adsorption of Cr­(VI), indicating that the adsorption process was an endothermic process. In addition, 1/ n of the Freundlich model was between 0.1 and 0.5, illustrating that Fe 3 O 4 @UiO-66@PANI possessed a strong binding force with Cr­(VI), which was mainly attributed to the electrostatic attraction of protonated imine groups …”

“…In addition, 1/n of the Freundlich model was between 0.1 and 0.5, illustrating that Fe 3 O 4 @UiO-66@PANI possessed a strong binding force with Cr(VI), which was mainly attributed to the electrostatic attraction of protonated imine groups. 43 3.5. Adsorption Thermodynamics.…”