Preparation of hierarchical porous polypyrrole nanoclusters and their application for removal of Cr(vi) ions in aqueous solution

Abstract

Hierarchical porous polypyrrole (PPy) nanoclusters composed of small PPy nanospheres were successfully prepared in one-step by a reactive-template method without any surfactants. The Fe 3 O 4 nanoclusters acted as both the template for shaping PPy structure and oxidant source simultaneously. The dosage of pyrrole monomer, the concentration of HCl acid had significant influence on the structures and conductivities of the resulting PPy nanoclusters. By carefully controlling the experimental conditions, hierarchical porous PPy nanoclusters with the surface area as high as 104 m 2 g À1 were obtained. The value was about 3.5 times larger than that of traditional PPy nanoparticles. Based on the transmission electron microscope (TEM) images and Fourier-transform infrared (FT-IR) spectra, a possible formation mechanism was proposed and investigated in detail. To test the feasibility of using the PPy nanoclusters in real applications, the capacity of nanoclusters as a heavy metal ion remover was explored. The resulting PPy nanoclusters showed an excellent ability to remove Cr(VI) ions in aqueous solution.

Effective Adsorption of Heavy Metal Cations by Superparamagnetic Poly(aniline‐co‐m‐phenylenediamine)@Fe3O4 Nanocomposite

“…The SEM micrographs of (a) Fe 3 Figure 2 presents the FTIR absorption spectra of PAMpDA, Fe 3 O 4 , and PAMpDA@Fe 3 O 4 nanocomposite. It is clear that the copolymer and nanocomposites showed very similar spectra.…”

“…15,16 Magnetic adsorbents are usually composed of the magnetic cores to ensure a strong magnetic response and a polymeric shell to supply favorable functional groups for various applications. 17,18 The objective of current research is to prepare metal-chelating conductive polymer, poly(aniline-co-m-phenylenediamine) (PAMpDA), and its superparamagnetic poly(aniline-co-mphenylenediamine)@Fe 3 O 4 (PAMpDA@Fe 3 O 4 ) nanocomposite as adsorbents for the removal of risky heavy metals ions such as Pb(II), Cd(II), and Co(II) ions from aqueous medium. In this research, PAMpDA copolymer and PAMpDA@Fe 3 O 4 nanocomposite were synthesized by chemical oxidative polymerization and in situ coprecipitation technique, respectively.…”

High-performance towards Cr(VI) removal using multi-active sites of polypyrrole–graphene oxide nanocomposites: Batch and column studies

“…Yao et al [21] prepared hierarchical porous PPy nanoclusters for the removal of Cr(VI) ions in aqueous solution and observed that removal capacity of PPy nanoclusters was higher than that of traditional PPy nanoparticles owing to their larger surface area. Moreover, for enhanced removal of Cr(VI) from aqueous solutions, Bhaumik et al [22,23] synthesized PPy/ Fe 3 O 4 magnetic nanocomposite and PPy-PANI nanofibers.…”

Polypyrrole-coated halloysite nanotube clay nanocomposite: Synthesis, characterization and Cr(VI) adsorption behaviour

“…Recently, conducting polymers have been proven to be promising materials for the adsorption of Cr(VI) from aqueous solutions (Bhaumik et al, 2011;Yao et al, 2011). Availability, easy preparation and functionalisation have made them highly desirable in many applications.…”