Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan
Magnetic nano-chitosan (MNC) was prepared and characterized. The kinetics, thermodynamics, and influencing factors of the adsorption of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup>, as well as their competitive adsorption onto...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/6/2607 |
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| author | Yuran He Panqing Zhang Lijun Wang |
| author_facet | Yuran He Panqing Zhang Lijun Wang |
| author_sort | Yuran He |
| collection | DOAJ |
| description | Magnetic nano-chitosan (MNC) was prepared and characterized. The kinetics, thermodynamics, and influencing factors of the adsorption of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup>, as well as their competitive adsorption onto MNC in aqueous solution, were studied. The results showed that the adsorption kinetics and thermodynamics of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> were well described by the pseudo-second-order kinetic model and Langmuir isothermal adsorption model, indicating that the adsorption was mainly chemical adsorption and endothermic. Increasing the dosage of MNC, the equilibrium adsorption capacity (q<sub>e</sub>) of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> decreased; their removal rate (η) increased. With the increase in the solution’s pH, the q<sub>e</sub> and η of Cr<sup>6+</sup> first increased and then decreased; the q<sub>e</sub> and η of Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> increased. With the increase in the metal ion initial concentration, the q<sub>e</sub> increased; the η of Cr<sup>6+</sup>, Cu<sup>2+</sup>, and Zn<sup>2+</sup> decreased, while the η of Pb<sup>2+</sup> increased first and then decreased. Temperature had a weak influence on the q<sub>e</sub> of Cr<sup>6+</sup> and Pb<sup>2+</sup>, while it had a strong influence on Cu<sup>2+</sup> and Zn<sup>2+</sup>, the q<sub>e</sub> and η were greater when the temperature was higher, and the adsorption was spontaneous and endothermic. The q<sub>e</sub> and η of Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> decreased in the presence of co-existing ions. The influences among metal ions existed in a binary and ternary ion system. The current study’s results provide a theoretical support for the simultaneous treatment of harmful metal ions in wastewater by MNC. |
| first_indexed | 2024-03-11T06:07:16Z |
| format | Article |
| id | doaj.art-55c7d02cdea241c181e44f4ac52ef154 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T06:07:16Z |
| publishDate | 2023-03-01 |
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| series | Molecules |
| spelling | doaj.art-55c7d02cdea241c181e44f4ac52ef1542023-11-17T12:52:41ZengMDPI AGMolecules1420-30492023-03-01286260710.3390/molecules28062607Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-ChitosanYuran He0Panqing Zhang1Lijun Wang2Department of Environmental Science and Engineering, School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, ChinaDepartment of Environmental Science and Engineering, School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, ChinaDepartment of Environmental Science and Engineering, School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, ChinaMagnetic nano-chitosan (MNC) was prepared and characterized. The kinetics, thermodynamics, and influencing factors of the adsorption of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup>, as well as their competitive adsorption onto MNC in aqueous solution, were studied. The results showed that the adsorption kinetics and thermodynamics of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> were well described by the pseudo-second-order kinetic model and Langmuir isothermal adsorption model, indicating that the adsorption was mainly chemical adsorption and endothermic. Increasing the dosage of MNC, the equilibrium adsorption capacity (q<sub>e</sub>) of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> decreased; their removal rate (η) increased. With the increase in the solution’s pH, the q<sub>e</sub> and η of Cr<sup>6+</sup> first increased and then decreased; the q<sub>e</sub> and η of Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> increased. With the increase in the metal ion initial concentration, the q<sub>e</sub> increased; the η of Cr<sup>6+</sup>, Cu<sup>2+</sup>, and Zn<sup>2+</sup> decreased, while the η of Pb<sup>2+</sup> increased first and then decreased. Temperature had a weak influence on the q<sub>e</sub> of Cr<sup>6+</sup> and Pb<sup>2+</sup>, while it had a strong influence on Cu<sup>2+</sup> and Zn<sup>2+</sup>, the q<sub>e</sub> and η were greater when the temperature was higher, and the adsorption was spontaneous and endothermic. The q<sub>e</sub> and η of Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> decreased in the presence of co-existing ions. The influences among metal ions existed in a binary and ternary ion system. The current study’s results provide a theoretical support for the simultaneous treatment of harmful metal ions in wastewater by MNC.https://www.mdpi.com/1420-3049/28/6/2607magnetic nano-chitosanpreparation and characterizationheavy metal ionadsorption removal |
| spellingShingle | Yuran He Panqing Zhang Lijun Wang Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan Molecules magnetic nano-chitosan preparation and characterization heavy metal ion adsorption removal |
| title | Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan |
| title_full | Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan |
| title_fullStr | Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan |
| title_full_unstemmed | Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan |
| title_short | Adsorption and Removal of Cr<sup>6+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup>, and Zn<sup>2+</sup> from Aqueous Solution by Magnetic Nano-Chitosan |
| title_sort | adsorption and removal of cr sup 6 sup cu sup 2 sup pb sup 2 sup and zn sup 2 sup from aqueous solution by magnetic nano chitosan |
| topic | magnetic nano-chitosan preparation and characterization heavy metal ion adsorption removal |
| url | https://www.mdpi.com/1420-3049/28/6/2607 |
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