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| Characterization of chitosan, Fe-Mn-modified rice husk biochar and its Cd2+ adsorption performance |
| Received:June 08, 2023 Revised:July 17, 2023 |
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| KeyWord:biochar;modification;chitosan;Fe-Mn;adsorption;Cd2+ |
| Author Name | Affiliation | E-mail | | WANG Jiangnan | College of Agronomy, Shenyang Agricultural University/National Biochar Research Institute/Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | SUN Xiaoxue | College of Agronomy, Shenyang Agricultural University/National Biochar Research Institute/Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | YANG Linghui | Shenyang Rural Revitalization and Development Center, Shenyang 110034, China | | | JIANG Nan | Shenyang Rural Revitalization and Development Center, Shenyang 110034, China | | | ZHANG Miao | College of Agronomy, Shenyang Agricultural University/National Biochar Research Institute/Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | LIU Zunqi | College of Agronomy, Shenyang Agricultural University/National Biochar Research Institute/Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | HE Tianyi | College of Agronomy, Shenyang Agricultural University/National Biochar Research Institute/Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | hetianyi@syau.edu.cn |
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| Abstract: |
| To improve the Cd2+ adsorption capacity of rice husk charcoal. Chitosan, iron nitrate, and potassium permanganate were used to modify rice husk biochar. Chitosan-modified rice husk biochar(C-BC)and iron-manganese-modified rice husk biochar(FM-BC)were prepared, and the basic physical and chemical properties of each rice husk biochar were characterized via specific surface area analysis, Fourier transform infrared spectroscopy, and X-ray diffraction characterization. Subsequently, kinetic adsorption and isothermal adsorption experiments were conducted, and the adsorption amount and removal rate of Cd2+ by modified biochar were investigated under different pH and dosing conditions. The results showed that both modification methods reduced the specific surface area and total pore volume of rice husk carbon. FM-BC was found to contain the characteristic functional groups Mn-O and Fe-O. In addition, the functional group types of rice husk charcoal before and after modification were found to have remained unchanged. Both modification methods induced corresponding crystal structure changes in rice husk carbon. The kinetic adsorption characteristics of Cd2+ on the two modified carbons were in accordance with the pseudo-second-order kinetic model. The intra-particle diffusion model was divided into three stages, and the isothermal adsorption characteristics of Cd2+ were found to be in accordance with the Langmuir model. The equilibrium adsorption capacities of C-BC and FM-BC were 25.51 mg·g-1 and 16.25 mg·g-1, respectively, which were 1.7 times and 1.08 times that of BC(14.97 mg·g-1). Finally, with the increase of solution pH, the adsorption capacity and removal rate of C-BC and FM-BC gradually increased, and were always higher than those of BC. With increasing dosage, the Cd2+ removal rate of C-BC and FM-BC increased gradually, while the adsorption capacity decreased gradually. Both modifications can improve the Cd2+ adsorption capacity of rice husk carbon to some extent, and both are dominated by single-molecule layer chemisorption, and the equilibrium adsorption amount of C-BC was significantly higher than that of FM-BC. Moderate adjustment of solution pH and dosage can improve the Cd2+ adsorption effect of modified rice husk carbon. |
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