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| Synergistic regulation of soil pH in sugarcane fields and Cd adsorption by an activated carbon-calcium hydroxide composite |
| Received:July 28, 2025 |
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| KeyWord:activated carbon composite material;adjustment of soil acidity;bioavailable Cd;synergistic effect |
| Author Name | Affiliation | E-mail | | CHEN Bi | College of Biotechnology and Food Engineering, Guangxi Science & Technology Normal University, Laibin 546199, China
Key Laboratory for the Green and Efficient Production Technology of Sugarcane, Guangxi Science & Technology Normal University, Laibin 546199, China | | | XIE Xinxin | College of Biotechnology and Food Engineering, Guangxi Science & Technology Normal University, Laibin 546199, China | | | MO Huiwang | College of Biotechnology and Food Engineering, Guangxi Science & Technology Normal University, Laibin 546199, China | | | JIANG Wangcheng | College of Biotechnology and Food Engineering, Guangxi Science & Technology Normal University, Laibin 546199, China | | | WANG Xiaoming | College of Biotechnology and Food Engineering, Guangxi Science & Technology Normal University, Laibin 546199, China
Key Laboratory for the Green and Efficient Production Technology of Sugarcane, Guangxi Science & Technology Normal University, Laibin 546199, China | wxm081@163.com |
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| Abstract: |
| To address the concurrent issues of soil acidification and Cd contamination in sugarcane fields, a porous calcium-hydroxideloaded activated-carbon composite(AC&Ca(OH)2)was developed using commercial activated carbon as a support. The structure and morphology of the composite were systematically characterized using Fourier transform infrared(FTIR)spectroscopy, scanning electron microscopy(SEM), and Brunauer-Emmett-Teller(BET)surface area and porosity analysis. Furthermore, the effects of the calcium hydroxide loading in the composite and the composite dosage on soil pH and bioavailable Cd concentration were examined. Results indicate that the AC&Ca(OH)2 composite successfully incorporated calcium hydroxide and exhibited abundant surface-active sites. At a mass ratio of activated carbon to calcium hydroxide of 1∶0.5 with an addition amount of 2.0%, the soil pH increased from 4.35±0.01 to 7.23±0.02, and the removal rate of bioavailable Cd reached 39.4%± 1.0%. Under these optimal conditions, the soil pH fell within the optimal range for sugarcane growth, and the bioavailable Cd content was significantly reduced. Adsorption kinetics and isotherm analyses demonstrated that Cd adsorption by AC&Ca(OH)2 followed the pseudo-second-order kinetic model(R2>0.99)and the Freundlich isotherm model(R2>0.97), indicating that the adsorption process was primarily governed by chemisorption mechanisms and exhibited multilayer heterogeneous surface adsorption characteristics. The AC&Ca(OH)2 composite and its application strategy presented in this study provide an effective approach for the co-remediation of Cd-contaminated acidic soils. |
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