TY - JOUR
T1 - Adsorption of perfluorooctane sulfonate on carbonized poly-melamine-formaldehyde sponge
AU - Zhang, Ruiming
AU - Hu, Zhibiao
AU - Wei, Huanhuan
AU - Zhang, Shujuan
AU - Meng, Xiaoguang
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/7/20
Y1 - 2020/7/20
N2 - In this study, we developed a simple carbonized poly-melamine-formaldehyde sponge (CMF) acting as an adsorbent for adsorbing perfluorooctane sulfonate (PFOS) from the waste poly-melamine-formaldehyde (MF) sponge. The PFOS removal by the developed adsorbent was comprehensively investigated using batch adsorption, including kinetics, isotherm, ionic strength and ionic type and pH edge. PFOS adsorption kinetics followed a pseudo-second-order kinetic model, and reached equilibrium within 3 min. The adsorption isotherm was well described by the Freundlich model, as well as by the Langmuir model at a low initial concentration. The adsorption capacity gradually decreased with the increase of pH, and it was up to 216.4 μg/g even at pH 12.1. However, the adsorption capacity increased with the increase in ionic strength. Furthermore, the co-existing ions and small organic acids also promoted the PFOS adsorption on CMF sponge to different extents. Both the hydrophobic interaction and electrostatic attraction played an important role on adsorption, as well as chemical interaction and hydrogen bonding from spectroscopic results.
AB - In this study, we developed a simple carbonized poly-melamine-formaldehyde sponge (CMF) acting as an adsorbent for adsorbing perfluorooctane sulfonate (PFOS) from the waste poly-melamine-formaldehyde (MF) sponge. The PFOS removal by the developed adsorbent was comprehensively investigated using batch adsorption, including kinetics, isotherm, ionic strength and ionic type and pH edge. PFOS adsorption kinetics followed a pseudo-second-order kinetic model, and reached equilibrium within 3 min. The adsorption isotherm was well described by the Freundlich model, as well as by the Langmuir model at a low initial concentration. The adsorption capacity gradually decreased with the increase of pH, and it was up to 216.4 μg/g even at pH 12.1. However, the adsorption capacity increased with the increase in ionic strength. Furthermore, the co-existing ions and small organic acids also promoted the PFOS adsorption on CMF sponge to different extents. Both the hydrophobic interaction and electrostatic attraction played an important role on adsorption, as well as chemical interaction and hydrogen bonding from spectroscopic results.
KW - Adsorption
KW - Electrostatic attraction
KW - Hydrophobic interaction
KW - Perfluorooctane Sulfonate
KW - Poly-melamine-formaldehyde sponge
UR - http://www.scopus.com/inward/record.url?scp=85083467759&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083467759&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.138626
DO - 10.1016/j.scitotenv.2020.138626
M3 - Article
C2 - 32330719
AN - SCOPUS:85083467759
SN - 0048-9697
VL - 727
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 138626
ER -