TY - JOUR
T1 - Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for Cr(VI) and P(V) removal
AU - Yao, Wei
AU - Rao, Pinhua
AU - Lo, Irene M.C.
AU - Zhang, Wenqi
AU - Zheng, Wenrui
N1 - Publisher Copyright:
© 2014 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
PY - 2014/12/1
Y1 - 2014/12/1
N2 - Pollutants that exist in anionic species are issues of concern in water treatment. Compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments. In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties (QM-chitosan) was prepared and employed to remove chromium(VI) and phosphorus(V) (Cr(VI) and P(V)) from aqueous environments. The QM-chitosan was characterized by Fourier transform infrared spectrometry (FT-IR), thermogravimetric analysis (TGA), energy dispersive X-ray (SEM-EDX) and zeta potential. Batch experiments show that QM-chitosan can effectively remove Cr(VI) and P(V), and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of Cr(VI) and P(V) removal. The adsorption isotherms of both Cr(VI) and P(V) on the QM-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P(V) (2.783mmol/g) was found to be higher than that of Cr(VI) (2.323mmol/g), resulting from the size of the H2PO4- ions being smaller than that of the HCrO4- ions. However, the theoretical calculation and experimental results showed that QM-chitosan had a stronger affinity for Cr(VI) than P(V). The adsorption-desorption of the QM-chitosan was evaluated, and high regeneration rates were demonstrated.
AB - Pollutants that exist in anionic species are issues of concern in water treatment. Compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments. In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties (QM-chitosan) was prepared and employed to remove chromium(VI) and phosphorus(V) (Cr(VI) and P(V)) from aqueous environments. The QM-chitosan was characterized by Fourier transform infrared spectrometry (FT-IR), thermogravimetric analysis (TGA), energy dispersive X-ray (SEM-EDX) and zeta potential. Batch experiments show that QM-chitosan can effectively remove Cr(VI) and P(V), and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of Cr(VI) and P(V) removal. The adsorption isotherms of both Cr(VI) and P(V) on the QM-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P(V) (2.783mmol/g) was found to be higher than that of Cr(VI) (2.323mmol/g), resulting from the size of the H2PO4- ions being smaller than that of the HCrO4- ions. However, the theoretical calculation and experimental results showed that QM-chitosan had a stronger affinity for Cr(VI) than P(V). The adsorption-desorption of the QM-chitosan was evaluated, and high regeneration rates were demonstrated.
KW - Adsorption
KW - Cr(VI)
KW - Magnetic chitosan
KW - P(V)
KW - Quaternary ammonium
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000347664100002
UR - https://openalex.org/W2091691534
UR - https://www.scopus.com/pages/publications/84915755744
U2 - 10.1016/j.jes.2014.03.005
DO - 10.1016/j.jes.2014.03.005
M3 - Journal Article
C2 - 25499485
SN - 1001-0742
VL - 26
SP - 2379
EP - 2386
JO - Journal of Environmental Sciences
JF - Journal of Environmental Sciences
IS - 12
ER -
