Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar
The cooling water of nuclear power plants and discarded crayfish shells (CS), both containing Sr(II), are waste resources that cause environmental pollution and endanger human health. In this study, magnetic biochar produced by crayfish shells (mag@CSBC) was used as an adsorbent to remove radionucli...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-05-01
|
| Series: | Separations |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2297-8739/10/5/310 |
| _version_ | 1797598313447424000 |
|---|---|
| author | Wenchao Lu Jundong Feng Marta Otero Tao Liao Liang Qiu |
| author_facet | Wenchao Lu Jundong Feng Marta Otero Tao Liao Liang Qiu |
| author_sort | Wenchao Lu |
| collection | DOAJ |
| description | The cooling water of nuclear power plants and discarded crayfish shells (CS), both containing Sr(II), are waste resources that cause environmental pollution and endanger human health. In this study, magnetic biochar produced by crayfish shells (mag@CSBC) was used as an adsorbent to remove radionuclide Sr(II) in an aqueous solution and under irradiation conditions. Scanning electron microscopy, X-ray diffraction analysis, Fourier-transform infrared spectroscopy and vibration sample magnetometer analysis were used to characterize mag@CSBC. In addition, an isothermal adsorption experiment conducted under irradiation conditions determined that the maximum adsorption capacity of mag@CSBC was 21.902 mg/g, which was 1.896 mg/g higher than that from experiments conducted under conditions without irradiation and more suitable for the Freundlich isotherm model. The kinetic experiment proved that irradiation could improve the adsorption cap acity of mag@CSBC and reduce the adsorption equilibrium time. At the same time, the experiment further proved that, under irradiated conditions, the adsorption rate of mag@CSBC can reach more than 90%, and the adsorption capacity is the highest when the pH is 8 and the reaction process is exothermic. Competitive adsorption with Na(I) has a high selectivity and strong recyclability. Finally, the mechanism of Sr(II) adsorption by mag@CSBC under irradiation was studied. In conclusion, mag@CSBC, as a low-cost, easy-to-synthesize, environmentally friendly and easy-to-recycle adsorbent, can be applied in batches for the removal of Sr(II) in aqueous solutions. In particular, the concept of using irradiation technology to optimize adsorption behavior serves as an inspiration for future research. |
| first_indexed | 2024-03-11T03:19:32Z |
| format | Article |
| id | doaj.art-84ca7d15b94a4ee6b8a662db748873b4 |
| institution | Directory Open Access Journal |
| issn | 2297-8739 |
| language | English |
| last_indexed | 2024-03-11T03:19:32Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Separations |
| spelling | doaj.art-84ca7d15b94a4ee6b8a662db748873b42023-11-18T03:16:18ZengMDPI AGSeparations2297-87392023-05-0110531010.3390/separations10050310Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell BiocharWenchao Lu0Jundong Feng1Marta Otero2Tao Liao3Liang Qiu4Institute of Agro-Products Processing and Nuclear Agricultural Technology, Hubei Academy of Agricultural Sciences, Wuhan 430064, ChinaDepartment of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCESAM, Department of Environment and Planning, Campus Universitário de Santiago, 3810-193 Aveiro, PortugalInstitute of Agro-Products Processing and Nuclear Agricultural Technology, Hubei Academy of Agricultural Sciences, Wuhan 430064, ChinaInstitute of Agro-Products Processing and Nuclear Agricultural Technology, Hubei Academy of Agricultural Sciences, Wuhan 430064, ChinaThe cooling water of nuclear power plants and discarded crayfish shells (CS), both containing Sr(II), are waste resources that cause environmental pollution and endanger human health. In this study, magnetic biochar produced by crayfish shells (mag@CSBC) was used as an adsorbent to remove radionuclide Sr(II) in an aqueous solution and under irradiation conditions. Scanning electron microscopy, X-ray diffraction analysis, Fourier-transform infrared spectroscopy and vibration sample magnetometer analysis were used to characterize mag@CSBC. In addition, an isothermal adsorption experiment conducted under irradiation conditions determined that the maximum adsorption capacity of mag@CSBC was 21.902 mg/g, which was 1.896 mg/g higher than that from experiments conducted under conditions without irradiation and more suitable for the Freundlich isotherm model. The kinetic experiment proved that irradiation could improve the adsorption cap acity of mag@CSBC and reduce the adsorption equilibrium time. At the same time, the experiment further proved that, under irradiated conditions, the adsorption rate of mag@CSBC can reach more than 90%, and the adsorption capacity is the highest when the pH is 8 and the reaction process is exothermic. Competitive adsorption with Na(I) has a high selectivity and strong recyclability. Finally, the mechanism of Sr(II) adsorption by mag@CSBC under irradiation was studied. In conclusion, mag@CSBC, as a low-cost, easy-to-synthesize, environmentally friendly and easy-to-recycle adsorbent, can be applied in batches for the removal of Sr(II) in aqueous solutions. In particular, the concept of using irradiation technology to optimize adsorption behavior serves as an inspiration for future research.https://www.mdpi.com/2297-8739/10/5/310biocharadsorptionstrontium |
| spellingShingle | Wenchao Lu Jundong Feng Marta Otero Tao Liao Liang Qiu Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar Separations biochar adsorption strontium |
| title | Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar |
| title_full | Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar |
| title_fullStr | Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar |
| title_full_unstemmed | Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar |
| title_short | Removal of Sr(II) in Aqueous Solutions Using Magnetic Crayfish Shell Biochar |
| title_sort | removal of sr ii in aqueous solutions using magnetic crayfish shell biochar |
| topic | biochar adsorption strontium |
| url | https://www.mdpi.com/2297-8739/10/5/310 |
| work_keys_str_mv | AT wenchaolu removalofsriiinaqueoussolutionsusingmagneticcrayfishshellbiochar AT jundongfeng removalofsriiinaqueoussolutionsusingmagneticcrayfishshellbiochar AT martaotero removalofsriiinaqueoussolutionsusingmagneticcrayfishshellbiochar AT taoliao removalofsriiinaqueoussolutionsusingmagneticcrayfishshellbiochar AT liangqiu removalofsriiinaqueoussolutionsusingmagneticcrayfishshellbiochar |