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| Removing cadmium from water with spinel bimetal modified biochar |
| Received:December 07, 2021 |
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| KeyWord:straw recycling;spinel bimetal;functional groups;cadmium pollution |
| Author Name | Affiliation | E-mail | | BAI Ma | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | CHAI Youzheng | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | CHEN Anwei | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | A.Chen@hunau.edu.cn | | YUAN Jiayi | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | PENG Cheng | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | WANG Xueqin | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| To realize resource utilization of agricultural and forestry waste biomass, non-precious bimetal biochar with oxygen-containing functional groups was prepared by the impregnation-sol-gel method with discarded rice and soybean straw as the base. The modified biochar with a high ability to remove cadmium from water was screened by controlling the pyrolysis temperature, biomass raw material, modifier proportion, and egg white liquid dosage. The results showed that when the pyrolysis temperature was 450℃ and the dosage of egg white was 10 mL, compared with unmodified biochar and soy-based biochar, spinel type Fe-Mn rice-based modified biochar (MF-BCS) showed better adsorption capacity for cadmium, with a maximum adsorption capacity of 109.2 mg·g-1 and adsorption equilibrium time of 100 min. Research has shown that the synergistic modification of bimetal with hydroxyl and carboxyl functional groups significantly increased the specific surface area and adsorption sites of biochar. Adsorption process of cadmium by modified biochar was more consistent with the quasi-firstorder kinetic equation, which indicates that the adsorption was mainly physical and supplemented by chemical complexation adsorption. |
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