Assembly of conducting polypyrrole hydrogels as a suitable adsorbent for Cr(VI) removal

Abstract

Unique polypyrrole (PPy) hydrogels are prepared by using orange IV as the dopant and FeCl 3 as the oxidant. The static polymerization of pyrrole monomer in aqueous solution is accompanied with self-assembly of PPy hydrogel. PPy hydrogels not only show good electrical conductivities, but also exhibit excellent water-absorbent behaviors. The macroscopic appearance, microscopic morphology and water-absorbent behaviors of PPy hydrogels can be controlled by the choice of the reaction condition. The effects of ionic strength on the physical properties of PPy hydrogels are also studied. The results indicate that PPy hydrogels show improved water absorbencies in saline solution. Moreover, PPy hydrogel is used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. PPy hydrogel exhibits much better adsorption performance than common PPy nanoparticles. This kind of PPy hydrogel is expected to be a potential candidate for water treatment.

Self-assembled functional components-doped conductive polypyrrole composite hydrogels with enhanced electrochemical performances

“…Sodium alginate can be combined with divalent or polyvalent cations other than magnesium ions. [5][6][7][8] Considering many advantages of sodium alginate, sodium alginate molecule has a large number of carboxyl and hydroxyl structures. It can be used as an ideal biopolymer for ordered nanostructure template synthesis.…”

Facile Assembly of Polyaniline/Graphene Oxide Composite Hydrogels as Adsorbent for Cr(VI) Removal

“…The pseudo‐second‐order kinetic model , expressed as Eq . , was used to describe the adsorption kinetics of the hydrogels. where q t was the adsorption capacity of Cr(VI) adsorbed at a certain time (mg g −1 ), k 2 is the pseudo‐second‐order rate constant (g mg −1 min −1 ).…”

“…where q e was the adsorption capacity of Cr(VI) adsorbed onto adsorbent (mg g −1 ), C 0 was the initial Cr(VI) (mg L −1 ) concentration, C e was the equilibrium concentration of Cr(VI) (mg L −1 ) after treatment, V was the volume of the solution (L), m was the mass of adsorbent (g). The pseudo-second-order kinetic model [33], expressed as Eq. 2, was used to describe the adsorption kinetics of the hydrogels.…”

Polyindole and polypyrrole as a sustainable platform for environmental remediation and sensor applications

“…Please do not adjust margins Please do not adjust margins occur very easily in the powder form and incurs a very difficult post-separation process. Since pollutants are often present at low concentration levels, 3D materials with a high surface area were employed as highly efficient dye absorbents 201 . Xi Ye et al fabricated pure PPY hydrogel beads for dye adsorbent via an oxidant-templating strategy for the first time 189 .…”

“…Since pollutants are often present at low concentration levels, 3D materials with a high surface area were employed as highly efficient dye absorbents. 201 Xi Ye et al fabricated pure PPY hydrogel beads for dye adsorption via an oxidant-templating strategy for the first time. 189 The methyl orange adsorption capacity of PPY hydrogel beads was 236.9 mg g −1 , which was significantly much higher than that of PPY powder.…”