Surface-functionalized polymeric microspheres have wide applications in various areas. Herein, monodisperse poly(styrene–methyl methacrylate–acrylic acid) (PSMA) microspheres were prepared via emulsion polymerization. Polyaniline (PANI) was then coated on the PSMA surface via in situ polymerization, and a three-dimensional (3D) structured reticulate PANI/PSMA composite was, thus, obtained. The adsorption performance of the composite for organic dyes under different circumstances and the adsorption mechanism were studied. The obtained PANI/PSMA composite exhibited a high adsorption rate and adsorption capacity, as well as good adsorption selectivity toward methyl orange (MO). The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm. The maximum adsorption capacity for MO was 147.93 mg/g. After five cycles of adsorption–desorption, the removal rate remained higher than 90%, which indicated that the adsorbent has great recyclability. The adsorbent materials presented herein would be highly valuable for the removal of organic dyes from wastewater.
Pyrrole (Py) is easily agglomerated
during the polymerization process,
affecting its performance. In this paper, polypyrrole/monodispersed
latex sphere (PPy/MLS) composites were prepared using in-situ polymerization
for the adsorption of hexavalent chromium (Cr(VI)). The specific surface
area of PPy/MLS (39.30 m2/g) was increased relative to
that of PPy (24.82 m2/g), thus providing more effective
adsorption sites. In addition, the adsorption properties of Cr(VI)
under different conditions, including Py content, pH of the aqueous
solution, and PPy/MLS dosage, were investigated to reveal the adsorption
mechanism. The results showed that PPy/MLS possessed high Cr(VI) adsorption
capacities when the Py content was 50 wt %. The maximum adsorption
capacity was 343.64 mg/g at pH 2.0 and 25 °C. Remarkably, the
adsorbents exhibited an excellent removal rate of Cr(VI) after three
cycles of adsorption–desorption (over 99%), suggesting that
the adsorbents had exceptional recyclability. Furthermore, the adsorption
process followed quasi-second-order kinetics and Langmuir isothermal
adsorption model. The high adsorption performance, sustainability,
and cost-efficiency make this adsorbent a promising candidate for
large-scale Cr(VI) contaminant removal.
The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.
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