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Nonlinear Isotherm and Kinetic Modeling of Cu(II) and Pb(II) Uptake from Water by MnFe2O4/Chitosan Nanoadsorbents

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College of Engineering, National University, Manila 1008, Philippines
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Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
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School of Technology, University of the Philippines Visayas, Miagao, Iloilo 5023, Philippines
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University Core Research Center for Disaster-Free and Safe Ocean City Construction, Dong-A University, Busan 49315, Korea
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Institute of Hot Spring Industry, Chia-Nan University of Pharmacy and Science, Tainan 71710, Taiwan
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Center of Excellence in Environmental Catalysis and Adsorption, Faculty of Engineering, Thammasat University, Pathumthani 12120, Thailand
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Department of Architectural Engineering, Dong-A University, Busan 49315, Korea
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Department of Chemical Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
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Authors to whom correspondence should be addressed.
Academic Editor: Laura Bulgariu
Water 2021, 13(12), 1662; https://doi.org/10.3390/w13121662
Received: 14 May 2021 / Revised: 7 June 2021 / Accepted: 8 June 2021 / Published: 14 June 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Researchers are in continuous search of better strategies to minimize, if not prevent, the anthropogenic release of toxic heavy metals, such as Cu(II) and Pb(II), into drinking water resources and the natural environment. Herein, we report for the first time the low-temperature combustion synthesis of magnetic chitosan-manganese ferrite in the absence of toxic cross-linking agents and its removal of Cu(II) and Pb(II) from single-component metal solutions. The nonlinear Langmuir model best described the isotherm data, while the nonlinear pseudo-second order model best described the kinetic data, signifying monolayer Cu(II) or Pb(II) adsorption and chemisorption as the rate-determining step, respectively. Adsorption capacities by magnetic chitosan-manganese ferrite obtained for both metals were consistently higher than those by manganese ferrite, indicating that chitosan enhanced the performance of the magnetic adsorbent. The maximum adsorption capacities of magnetic chitosan-manganese ferrite for Cu(II) and Pb(II) were 14.86 and 15.36 mg g−1, while that of manganese ferrite were 2.59 and 13.52 mg g−1, respectively. Moreover, the adsorbents showed superior binding affinity and sorption for Pb(II) than Cu(II) owing to the stronger ability of the former to form inner-sphere complexes with manganese ferrite and magnetic chitosan-manganese ferrite. Finally, thermodynamic studies revealed that the uptake of either Pb(II) or Cu(II) by magnetic chitosan-manganese ferrite was spontaneous and endothermic. The as-prepared adsorbent was characterized for morphology, elemental composition, surface functional sites, and particle size using scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and dynamic light scattering technique, respectively. View Full-Text
Keywords: adsorption; chitosan; heavy metals; nanotechnology; water treatment adsorption; chitosan; heavy metals; nanotechnology; water treatment
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MDPI and ACS Style

Taguba, M.A.M.; Ong, D.C.; Ensano, B.M.B.; Kan, C.-C.; Grisdanurak, N.; Yee, J.-J.; de Luna, M.D.G. Nonlinear Isotherm and Kinetic Modeling of Cu(II) and Pb(II) Uptake from Water by MnFe2O4/Chitosan Nanoadsorbents. Water 2021, 13, 1662. https://doi.org/10.3390/w13121662

AMA Style

Taguba MAM, Ong DC, Ensano BMB, Kan C-C, Grisdanurak N, Yee J-J, de Luna MDG. Nonlinear Isotherm and Kinetic Modeling of Cu(II) and Pb(II) Uptake from Water by MnFe2O4/Chitosan Nanoadsorbents. Water. 2021; 13(12):1662. https://doi.org/10.3390/w13121662

Chicago/Turabian Style

Taguba, Manny A.M., Dennis C. Ong, Benny M.B. Ensano, Chi-Chuan Kan, Nurak Grisdanurak, Jurng-Jae Yee, and Mark D.G. de Luna 2021. "Nonlinear Isotherm and Kinetic Modeling of Cu(II) and Pb(II) Uptake from Water by MnFe2O4/Chitosan Nanoadsorbents" Water 13, no. 12: 1662. https://doi.org/10.3390/w13121662

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