Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI)
Since ferric tetroxide (Fe<sub>3</sub>O<sub>4</sub>) has strong magnetic properties, coating amorphous silica (SiO<sub>2</sub>) with Fe<sub>3</sub>O<sub>4</sub> nanoparticles can protect the magnetic Fe<sub>3</sub>O<sub>4&...
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MDPI AG
2023-08-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/15/2827 |
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| author | Heng Li Junpeng Hua Ranran Li Yan Zhang Huanhuan Jin Shijing Wang Guoyin Chen |
| author_facet | Heng Li Junpeng Hua Ranran Li Yan Zhang Huanhuan Jin Shijing Wang Guoyin Chen |
| author_sort | Heng Li |
| collection | DOAJ |
| description | Since ferric tetroxide (Fe<sub>3</sub>O<sub>4</sub>) has strong magnetic properties, coating amorphous silica (SiO<sub>2</sub>) with Fe<sub>3</sub>O<sub>4</sub> nanoparticles can protect the magnetic Fe<sub>3</sub>O<sub>4</sub> particles and form a new magnetic adsorbent with a core–shell structure and small pore size, the strong magnetic properties of which can efficiently solve the problem of the difficult separation and recovery of heavy metals from wastewater affecting present-day adsorption techniques. In this paper, SiO<sub>2</sub>-coated nanoscale Fe<sub>3</sub>O<sub>4</sub> particles were prepared using a modified sol–gel method for the adsorption and removal of Cr(VI) at lower pollution concentrations. The adsorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and a magnetic vibration sample magnetometer (VSM), and its adsorption performance was systematically investigated in terms of initial concentration, pH, and temperature. The experiments showed that the adsorption effect was optimal when the initial solution Cr(VI) was 40 mg/L. The adsorption capacity increased with a decrease in the initial solution’s pH and decreased with an increase in temperature. Furthermore, the adsorption capacity of Cr(VI) at low concentrations was much higher than that of other conventional adsorbents, the calculated unit adsorption capacity reached 13.609 mg·g<sup>−1</sup>, and the removal rate reached 64.8%. In addition, the strong magnetic nanocomposite (MS) had excellent recoverability, could achieve desorption via alkaline washing, and retained about 75% of the initial adsorption capacity after six cycles. |
| first_indexed | 2024-03-11T00:13:52Z |
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| language | English |
| last_indexed | 2024-03-11T00:13:52Z |
| publishDate | 2023-08-01 |
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| series | Water |
| spelling | doaj.art-cd858bffe8294072a9b7a4c7337bcc582023-11-18T23:48:17ZengMDPI AGWater2073-44412023-08-011515282710.3390/w15152827Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI)Heng Li0Junpeng Hua1Ranran Li2Yan Zhang3Huanhuan Jin4Shijing Wang5Guoyin Chen6Faculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaFaculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaFaculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaFaculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaFaculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaFaculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaFaculty of Hydraulic and Civil Engineering, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, ChinaSince ferric tetroxide (Fe<sub>3</sub>O<sub>4</sub>) has strong magnetic properties, coating amorphous silica (SiO<sub>2</sub>) with Fe<sub>3</sub>O<sub>4</sub> nanoparticles can protect the magnetic Fe<sub>3</sub>O<sub>4</sub> particles and form a new magnetic adsorbent with a core–shell structure and small pore size, the strong magnetic properties of which can efficiently solve the problem of the difficult separation and recovery of heavy metals from wastewater affecting present-day adsorption techniques. In this paper, SiO<sub>2</sub>-coated nanoscale Fe<sub>3</sub>O<sub>4</sub> particles were prepared using a modified sol–gel method for the adsorption and removal of Cr(VI) at lower pollution concentrations. The adsorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and a magnetic vibration sample magnetometer (VSM), and its adsorption performance was systematically investigated in terms of initial concentration, pH, and temperature. The experiments showed that the adsorption effect was optimal when the initial solution Cr(VI) was 40 mg/L. The adsorption capacity increased with a decrease in the initial solution’s pH and decreased with an increase in temperature. Furthermore, the adsorption capacity of Cr(VI) at low concentrations was much higher than that of other conventional adsorbents, the calculated unit adsorption capacity reached 13.609 mg·g<sup>−1</sup>, and the removal rate reached 64.8%. In addition, the strong magnetic nanocomposite (MS) had excellent recoverability, could achieve desorption via alkaline washing, and retained about 75% of the initial adsorption capacity after six cycles.https://www.mdpi.com/2073-4441/15/15/2827hexavalent chromium removalFe<sub>3</sub>O<sub>4</sub> particlesSiO<sub>2</sub> coatingcore–shell structurestrong magnetic |
| spellingShingle | Heng Li Junpeng Hua Ranran Li Yan Zhang Huanhuan Jin Shijing Wang Guoyin Chen Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI) Water hexavalent chromium removal Fe<sub>3</sub>O<sub>4</sub> particles SiO<sub>2</sub> coating core–shell structure strong magnetic |
| title | Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI) |
| title_full | Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI) |
| title_fullStr | Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI) |
| title_full_unstemmed | Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI) |
| title_short | Application of Magnetic Nanocomposites in Water Treatment: Core–Shell Fe<sub>3</sub>O<sub>4</sub> Material for Efficient Adsorption of Cr(VI) |
| title_sort | application of magnetic nanocomposites in water treatment core shell fe sub 3 sub o sub 4 sub material for efficient adsorption of cr vi |
| topic | hexavalent chromium removal Fe<sub>3</sub>O<sub>4</sub> particles SiO<sub>2</sub> coating core–shell structure strong magnetic |
| url | https://www.mdpi.com/2073-4441/15/15/2827 |
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