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| Effects of removing cadmium from soil and water using magnetic hydroxyapatite/triiron tetroxide material |
| Received:November 25, 2021 |
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| KeyWord:rice bran;hydroxyapatite (HAP);Fe3O4;cadmium;nano-material |
| Author Name | Affiliation | E-mail | | YIN Wenhua | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | LIU Yingchun | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WANG Jie | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WANG Shengsen | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WANG Xiaozhi | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | YIN Weiqin | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | wqyin@yzu.edu.cn |
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| Abstract: |
| This study investigated the effect of removing cadmium from soil and solution environments using magnetic hydroxyapatite/triiron tetroxide (HAP/Fe3O4) nanomaterials. Rice bran was used to prepare nanomaterials using the hydrothermal method, and the cadmium removal capacity was studied through water adsorption and soil culture experiments. The results showed that the adsorption data were more consistent with the pseudo-second-order kinetic model when the pH was 8 and the adsorption process was dominated by chemisorption. The adsorption mechanisms could be surface adsorption and precipitation formation when the solution was acidic, whereas when the solution was neutral and alkaline, the removal of Cd2+ was mainly due to surface adsorption and ion exchange. Furthermore, the adsorption capacity of HAP/Fe3O4 remained relatively high after five cycles, which implied that it possessed high reusability as an adsorbent. In the soil experiment, the pH of the soil increased with the extension of incubation time and increase in material dosage. Compared with the control group, the treatment supplemented with 0.5% HAP/Fe3O4 significantly reduced the content of extracted Cd in the soil by 62%. Leaching experiments showed that HAP/Fe3O4 enhanced the retention capacity of heavy metals in soil. As low-cost raw materials and environmentally friendly adsorbents, HAP/Fe3O4 nanomaterials have broad application prospects in water pollution treatment and soil remediation. |
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