One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water
Chitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> was synthesized by a one-step method using...
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MDPI AG
2021-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/6/1785 |
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| author | Zhe Jiang Nian Li Pei-Ying Li Bo Liu Hua-Jie Lai Tao Jin |
| author_facet | Zhe Jiang Nian Li Pei-Ying Li Bo Liu Hua-Jie Lai Tao Jin |
| author_sort | Zhe Jiang |
| collection | DOAJ |
| description | Chitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> was synthesized by a one-step method using carboxymethyl chitosan (CMC) and ferric salts under relatively mild conditions. The Fe<sub>3</sub>O<sub>4</sub> microspheres were formed and the core–shell structure of CMC@Fe<sub>3</sub>O<sub>4</sub> was synthesized in the meantime, which was well characterized via SEM/TEM, XRD, VSM, FT-IR, thermo gravimetric analysis (TGA), XPS, size distribution, and zeta potential. The effects of initial arsenic concentration, pH, temperature, contact time, and ionic strength on adsorption quantity of inorganic arsenic was studied through batch adsorption experiments. The magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> displayed satisfactory adsorption performance for arsenic in water samples, up to 20.1 mg/g. The optimal conditions of the adsorption process were pH 3.0, 30−50 °C, and a reaction time of 15 min. The adsorption process can be well described by pseudo-second-order kinetic model, suggesting that chemisorption was main rate-controlling step. The Langmuir adsorption model provided much higher correlation coefficient than that of Freundlich adsorption model, indicating that the adsorption behavior is monolayer adsorption on the surface of the magnetic adsorbents. The above results have demonstrated that chitosan-based magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> is suitable for the removal of inorganic arsenic in water. |
| first_indexed | 2024-03-10T13:00:39Z |
| format | Article |
| id | doaj.art-1c303c94978b4f52b75d76e91019c673 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T13:00:39Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-1c303c94978b4f52b75d76e91019c6732023-11-21T11:32:34ZengMDPI AGMolecules1420-30492021-03-01266178510.3390/molecules26061785One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in WaterZhe Jiang0Nian Li1Pei-Ying Li2Bo Liu3Hua-Jie Lai4Tao Jin5Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, ChinaGuangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, ChinaGuangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, ChinaGuangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, ChinaGuangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, ChinaGuangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, ChinaChitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> was synthesized by a one-step method using carboxymethyl chitosan (CMC) and ferric salts under relatively mild conditions. The Fe<sub>3</sub>O<sub>4</sub> microspheres were formed and the core–shell structure of CMC@Fe<sub>3</sub>O<sub>4</sub> was synthesized in the meantime, which was well characterized via SEM/TEM, XRD, VSM, FT-IR, thermo gravimetric analysis (TGA), XPS, size distribution, and zeta potential. The effects of initial arsenic concentration, pH, temperature, contact time, and ionic strength on adsorption quantity of inorganic arsenic was studied through batch adsorption experiments. The magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> displayed satisfactory adsorption performance for arsenic in water samples, up to 20.1 mg/g. The optimal conditions of the adsorption process were pH 3.0, 30−50 °C, and a reaction time of 15 min. The adsorption process can be well described by pseudo-second-order kinetic model, suggesting that chemisorption was main rate-controlling step. The Langmuir adsorption model provided much higher correlation coefficient than that of Freundlich adsorption model, indicating that the adsorption behavior is monolayer adsorption on the surface of the magnetic adsorbents. The above results have demonstrated that chitosan-based magnetic adsorbent CMC@Fe<sub>3</sub>O<sub>4</sub> is suitable for the removal of inorganic arsenic in water.https://www.mdpi.com/1420-3049/26/6/1785chitosanadsorptionmagnetic adsorbentsinorganic arsenic |
| spellingShingle | Zhe Jiang Nian Li Pei-Ying Li Bo Liu Hua-Jie Lai Tao Jin One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water Molecules chitosan adsorption magnetic adsorbents inorganic arsenic |
| title | One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water |
| title_full | One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water |
| title_fullStr | One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water |
| title_full_unstemmed | One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water |
| title_short | One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water |
| title_sort | one step preparation of chitosan based magnetic adsorbent and its application to the adsorption of inorganic arsenic in water |
| topic | chitosan adsorption magnetic adsorbents inorganic arsenic |
| url | https://www.mdpi.com/1420-3049/26/6/1785 |
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