Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup>
Here, using Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> as a precursor, a novel core-shell structure magnetic Cu<sup>2+</sup> adsorbent (Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA) was successfully prepared. Several methods, namely...
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MDPI AG
2020-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/21/5047 |
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| author | Jun Cao Peng Wang Jie Shen Qi Sun |
| author_facet | Jun Cao Peng Wang Jie Shen Qi Sun |
| author_sort | Jun Cao |
| collection | DOAJ |
| description | Here, using Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> as a precursor, a novel core-shell structure magnetic Cu<sup>2+</sup> adsorbent (Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA) was successfully prepared. Several methods, namely X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Transmission electron microscope (TEM), Brunauer Emmett Teller (BET) and vibrating sample magnetometry (VSM) were used to characterize the adsorbent. A batch experiment was conducted to study the Cu<sup>2+</sup> adsorption capacity of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA at different pH values, contact time, initial Cu<sup>2+</sup> concentration and adsorbent does. It is found that the saturated adsorption capacity of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA on Cu<sup>2+</sup> is 86.54 mg/g. The adsorption isotherm analysis shows that the adsorption process of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA to Cu<sup>2+</sup> is more consistent with the Langmuir model, suggesting that it is a monolayer adsorption. Adsorption kinetics study found that the adsorption process of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA to Cu<sup>2+</sup> follows the pseudo-second kinetics model, which means that the combination of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA and Cu<sup>2+</sup> is the chemical chelating reaction. Thermodynamic analysis shows that the adsorption process of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA to Cu<sup>2+</sup> is endothermic, with increasing entropy and spontaneous in nature. The above results show that Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA is a promising Cu<sup>2+</sup> adsorbent. |
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| spelling | doaj.art-855c9b29aecc4003b65ef209267522c92023-11-20T20:26:06ZengMDPI AGMaterials1996-19442020-11-011321504710.3390/ma13215047Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup>Jun Cao0Peng Wang1Jie Shen2Qi Sun3College of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaWuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology 1037 Luoyu Road, Wuhan 430074, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaHere, using Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> as a precursor, a novel core-shell structure magnetic Cu<sup>2+</sup> adsorbent (Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA) was successfully prepared. Several methods, namely X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Transmission electron microscope (TEM), Brunauer Emmett Teller (BET) and vibrating sample magnetometry (VSM) were used to characterize the adsorbent. A batch experiment was conducted to study the Cu<sup>2+</sup> adsorption capacity of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA at different pH values, contact time, initial Cu<sup>2+</sup> concentration and adsorbent does. It is found that the saturated adsorption capacity of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA on Cu<sup>2+</sup> is 86.54 mg/g. The adsorption isotherm analysis shows that the adsorption process of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA to Cu<sup>2+</sup> is more consistent with the Langmuir model, suggesting that it is a monolayer adsorption. Adsorption kinetics study found that the adsorption process of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA to Cu<sup>2+</sup> follows the pseudo-second kinetics model, which means that the combination of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA and Cu<sup>2+</sup> is the chemical chelating reaction. Thermodynamic analysis shows that the adsorption process of Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA to Cu<sup>2+</sup> is endothermic, with increasing entropy and spontaneous in nature. The above results show that Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA is a promising Cu<sup>2+</sup> adsorbent.https://www.mdpi.com/1996-1944/13/21/5047Cu<sup>2+</sup> adsorbentcore-shell structureFe<sub>3</sub>O<sub>4</sub>@zeolite NaAchemical chelating reaction |
| spellingShingle | Jun Cao Peng Wang Jie Shen Qi Sun Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup> Materials Cu<sup>2+</sup> adsorbent core-shell structure Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA chemical chelating reaction |
| title | Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup> |
| title_full | Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup> |
| title_fullStr | Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup> |
| title_full_unstemmed | Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup> |
| title_short | Core-shell Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA as an Adsorbent for Cu<sup>2+</sup> |
| title_sort | core shell fe sub 3 sub o sub 4 sub zeolite naa as an adsorbent for cu sup 2 sup |
| topic | Cu<sup>2+</sup> adsorbent core-shell structure Fe<sub>3</sub>O<sub>4</sub>@zeolite NaA chemical chelating reaction |
| url | https://www.mdpi.com/1996-1944/13/21/5047 |
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