Magnetic Poly(glycidyl methacrylate) Microspheres with Grafted Polypyrrole Chains for the High-Capacity Adsorption of Congo Red Dye from Aqueous Solutions

Abstract

In this study, novel magnetic poly(glycidyl methacrylate) (PGMA) microspheres with grafted polypyrrole chains (magnetic PGMA-g-PPy) were developed for the high-capacity adsorption of Congo red (CR) from aqueous solutions. The magnetic PGMA-g-PPy was synthesized by the typical dispersion polymerization method and the ring-opening reaction of epoxy groups, producing abundant hydroxyls for the grafting polymerization of pyrrole in the presence of FeCl3 as an oxidizing agent on the surface of the microspheres. The characterization results showed that magnetic PGMA-g-PPy was successfully fabricated. The adsorption equilibrium data of the adsorbents could be well fitted by the Langmuir isotherm model, showing a high maximum adsorption capacity of 502.5 mg/g for CR. The adsorption followed pseudo-second-order kinetics with a fast speed. The adsorbents had no leaching of Fe in the solution at pH 1.0–11.0 for 24 h. The adsorption process was strongly pH-dependent and weakly ionic-strength-dependent. Furthermore, the magnetic microspheres could be easily regenerated, rapidly separated from the solution, and reused for wastewater treatment. The results suggest that magnetic PGMA-g-PPy microspheres are a promising efficient adsorbent for the removal of CR from wastewater.

Experimental Investigation of Magnetorheological Behavior of Fe3O4@PVP@OA Ferrofluid for Potential Application in Gas Condensate Blockage Reduction

“…In fact, the surface modification of Fe 3 O 4 @PVP by OA highlighted the surface spin effect resulting in a decrease in the M S of Fe 3 O 4 @PVP@OA nanoparticles compared to the magnetic Fe 3 O 4 nanoparticles . Moreover, it is obvious that there is no evidence of hysteresis in the magnetization curves of the samples with zero remanence and coercive fields, due to the fact that the magnetic nanoparticles possess superparamegnetic structures. , As a result, they are more likely to respond to an external magnetic field and may be redispersed instantly once this field is removed …”

“…56 Moreover, it is obvious that there is no evidence of hysteresis in the magnetization curves of the samples with zero remanence and coercive fields, due to the fact that the magnetic nanoparticles possess superparamegnetic structures. 57,58 As a result, they are more likely to respond to an external magnetic field and may be redispersed instantly once this field is removed. 59 3.4.…”

Understanding the Adsorption Behavior and Mechanism of Pt(IV) and Pd(II) on Super Amino-Modified Monodispersed PGMA Microspheres

“…3 NaCH PGMAN (7) where (V 2 − V 1 ) and (V 3 − V 2 ) represent the consumed volume of NaOH for the −NH 3 + and −NH 2 − + deprotonation, respectively, W PGMA-N is the total mass of added PGMA-N (0.01 g), and C NaOH is the concentration of NaOH (0.1 mol• L −1 ).…”

Recent Advances in the Removal of Organic Dyes from Aqueous Media with Conducting Polymers, Polyaniline and Polypyrrole, and Their Composites

“…The typical adsorbents had three components again: a conducting polymer, an inorganic compound, and a supporting material ( Table 3 ). Cobalt oxide/graphene [ 25 ] and molybdenum trioxide/magnetite [ 53 ] are examples of inorganic components, while the organics are represented by sodium alginate/algae biomass [ 130 ], polyacrylonitrile/poly( N -vinylpyrrolidone) [ 131 ], and poly(ethyleneglycol methacrylate)/magnetite microspheres [ 132 ].…”