| Hierarchically porous magnetic biochar as an efficient amendment for cadmium in water and soil: Performance and mechanism | |
| Fu, Haichao; Ma, Shuanglong; Xu, Shengjun; Duan, Ran; Cheng, Gong; Zhao, Peng | |
| 2021 | |
| Source Publication | CHEMOSPHERE
 |
| ISSN | 0045-6535 |
| Volume | 281Pages:- |
| Abstract | Three types of hierarchically porous magnetic biochars (HMBs) were prepared by pymlyzing low-cost wheat straw and potassium ferrate (K2FeO4) under a nitrogen atmosphere at 600, 700 and 800 degrees C, respectively, which could be used as amendments for cadmium (Cd) in water and soil. HMB fabricated at 700 degrees C (HMB700) had the best remediation performance for Cd in water and soil, which was mainly due to its largest specific surface area and micropore volume. Batch sorption experiments showed that Cd(II) sorption onto HMBs were well-described by a pseudo-second-order model and Sips (Freundlich-Langmuir) model, indicating that HMBs removed Cd(II) mainly through chemical adsorption. MINTEQ modeling evidenced that HMBs adsorbed Cd(II) mainly through precipitation rather than surface complexation. The adsorption behavior of HMB700 to Cd(II) could be explained by surface complexation (-OCd, -COOCd), precipitation (Cd(OH)(2) and CdCO3), physical adsorption (rich pore structure) and ion exchange (K+, Ca2+, Mg2+). Furthermore, adding HMBs (1 wt%) (incubation 60 days) could also significantly increase soil pH and electrical conductivity (EC), and significantly reduce the available Cd content in soil (47.97%-61.38%). Adding HMBs could promote the conversion of bioavailable to less bioavailable Cd forms. These results provided a new idea for fabricating agricultural waste-based HMBs to remediate Cd in water and soil. |
| Department | 中国科学院环境生物技术重点实验室 |
| Keyword | Wheat straw Potassium ferrate Hierarchically porous magnetic biochar Cadmium Water and soil remediation |
| WOS Research Area | Environmental Sciences |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/46117 |
| Collection | 中国科学院环境生物技术重点实验室 |
| Affiliation | 1.Henan Agr Univ, Collaborat Ctr Innovat Henan Food Crops, Zhengzhou 450002, Peoples R China 2.Henan Agr Univ, Coll Resources & Environm Sci, 95 Wenhua Rd, Zhengzhou 450002, Henan, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd, Beijing 100085, Peoples R China 4.Shenzhen Acad Environm Sci, Environm Engn Ctr, Shenzhen 518001, Peoples R China |
| Recommended Citation GB/T 7714 | Fu, Haichao,Ma, Shuanglong,Xu, Shengjun,et al. Hierarchically porous magnetic biochar as an efficient amendment for cadmium in water and soil: Performance and mechanism[J]. CHEMOSPHERE,2021,281:-. |
| APA | Fu, Haichao,Ma, Shuanglong,Xu, Shengjun,Duan, Ran,Cheng, Gong,&Zhao, Peng.(2021).Hierarchically porous magnetic biochar as an efficient amendment for cadmium in water and soil: Performance and mechanism.CHEMOSPHERE,281,-. |
| MLA | Fu, Haichao,et al."Hierarchically porous magnetic biochar as an efficient amendment for cadmium in water and soil: Performance and mechanism".CHEMOSPHERE 281(2021):-. |
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| Hierarchically porou（5476KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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