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| Effects of metal oxide modified biochar on spinach growth and cadmium accumulation in Cd-contaminated soil |
| Received:September 09, 2021 Revised:January 29, 2022 |
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| KeyWord:metal oxide modified biochar;cadmium;biomass;bioconcentration factor |
| Author Name | Affiliation | E-mail | | FAN Beibei | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation/College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | ZHAO Lei | Zhaoyuan Agricultural Technology Promotion Center, Zhaoyuan 265400, China | | | LIU Jianjun | Zhaoyuan Agricultural Technology Promotion Center, Zhaoyuan 265400, China | | | CUI Shihao | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation/College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | PENG Yutao | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation/College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
School of Agriculture, Sun Yat-sen University, Shenzhen 523758, China | | | MU Kangguo | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation/College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | kgmu@cau.edu.cn | | CHEN Qing | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation/College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| Metal oxide-modified biochar materials with good adsorption capacity for heavy metals have become popular soil remediation materials in recent years. However, there are few studies on the immobilization of Cd in soil using different metal oxide-modified biochars. In this study, the effects of ferrite-modified, magnetite-modified, and hydrotalcite-modified biochars on the growth and Cd accumulation in spinach were studied. The results demonstrated that under the application rate condition of 5 g · kg-1, metal oxide-modified biochar treatment could significantly improve soil pH and organic matter content. Compared with the control, treatment with ferrite-modified, magnetite-modified, and hydrotalcite-modified biochars reduced the DTPA-Cd content by 23.4%, 24.8%, and 37.1%, and the enrichment coefficients by 4.00%, 13.3%, and 65.0%, respectively. In addition, hydrotalcite-modified biochar increased the plant dry weight by 4.27 times and significantly reduced Cd accumulation(59.5%). In conclusion, a metal oxide-modified biochar can increase soil pH and soil organic matter content, reduce the availability and mobility of soil Cd, and improve soil quality, thereby promoting the growth of spinach and inhibiting the accumulation of Cd in spinach. Hydrotalcite-modified biochar performs significant advantages in promoting the growth of spinach and inactivating the soil Cd. |
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