TY - JOUR
T1 - Waste plastic filter modified with polyaniline and polypyrrole nanoparticles for hexavalent chromium removal
AU - Janmohammadi, Mehran
AU - Baghdadi, Majid
AU - Adyel, Tanveer M.
AU - Mehrdadi, Naser
PY - 2021/1/15
Y1 - 2021/1/15
N2 - Chromium (Cr) is a toxic heavy metal for environmental compartments and human health. In this study, waste polypropylene hollow filters (PPF) with an optimal pore size of 5 μm were amino-functionalized with an optimized amount of polyaniline (PANI) and polypyrrole (PPy) as an adsorbent for removing Cr (VI). The adsorbent was characterized by scanning electron microscope, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and the Brunauer-Emmett-Teller method, showing the successful polymerization of co-polymer on the surface of PPF and increasing the surface area up to 15.08 m2 g−1. A Box-Behnken design was applied by a quadratic model with 99.15% accuracy, revealing a significant impact of the initial concentration of Cr (VI) on the removal efficiency. Dynamic adsorption was conducted in a continuous and semi-continuous system with over 99% removal efficiency for various initial concentrations of Cr(VI). The fitted data showed that the adsorption process followed the pseudo-second-order kinetics and Langmuir isotherm models at the optimum pH of 2 with the predicted maximum adsorption capacity of 510.9 mg g−1 of PANI+PPy, which was significantly higher than some reported adsorbents. The effect of coexisting cations (Cu2+, Ni2+, and Zn2+) and anions (SO42−, Cl− and NO3−) on the removal efficiency revealed selective adsorption of Cr(VI) by the adsorbent. The produced adsorbent was capable of removing 76.6% of Cr(VI) from real electroplating wastewater. Regeneration of the adsorbent was performed by NaOH 1 mol L−1 up to three cycles with a 20% reduction in adsorption performance. All data showed that PPF@PANI+PPy was a promising adsorbent for Cr(VI) removal from aqueous solutions and real-world wastewater.
AB - Chromium (Cr) is a toxic heavy metal for environmental compartments and human health. In this study, waste polypropylene hollow filters (PPF) with an optimal pore size of 5 μm were amino-functionalized with an optimized amount of polyaniline (PANI) and polypyrrole (PPy) as an adsorbent for removing Cr (VI). The adsorbent was characterized by scanning electron microscope, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and the Brunauer-Emmett-Teller method, showing the successful polymerization of co-polymer on the surface of PPF and increasing the surface area up to 15.08 m2 g−1. A Box-Behnken design was applied by a quadratic model with 99.15% accuracy, revealing a significant impact of the initial concentration of Cr (VI) on the removal efficiency. Dynamic adsorption was conducted in a continuous and semi-continuous system with over 99% removal efficiency for various initial concentrations of Cr(VI). The fitted data showed that the adsorption process followed the pseudo-second-order kinetics and Langmuir isotherm models at the optimum pH of 2 with the predicted maximum adsorption capacity of 510.9 mg g−1 of PANI+PPy, which was significantly higher than some reported adsorbents. The effect of coexisting cations (Cu2+, Ni2+, and Zn2+) and anions (SO42−, Cl− and NO3−) on the removal efficiency revealed selective adsorption of Cr(VI) by the adsorbent. The produced adsorbent was capable of removing 76.6% of Cr(VI) from real electroplating wastewater. Regeneration of the adsorbent was performed by NaOH 1 mol L−1 up to three cycles with a 20% reduction in adsorption performance. All data showed that PPF@PANI+PPy was a promising adsorbent for Cr(VI) removal from aqueous solutions and real-world wastewater.
KW - Hexavalent chromium
KW - Polyaniline
KW - Polypropylene
KW - Polypyrrole
KW - Waste plastic
UR - http://www.scopus.com/inward/record.url?scp=85089997350&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.141850
DO - 10.1016/j.scitotenv.2020.141850
M3 - Article
C2 - 32889277
AN - SCOPUS:85089997350
VL - 752
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
M1 - 141850
ER -
