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| Sorption of Pb（Ⅱ） and Cd（Ⅱ） by Manure-and Wood-derived Biochars |
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| KeyWord:biochar; heavy metals; pH; adsorption; precipitation |
| Author Name | Affiliation | | XIA Guang-jie | College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China | | SONG Ping | College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China | | QIU Yu-ping | College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China
College of Environmental Science and Engineering, Tongji University, Shanghai 200092 |
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| Abstract: |
| Biochars have been used to remove and/or fix pollutants in the environment. In this study, removal mechanisms of Pb（Ⅱ） and Cd（Ⅱ） from aqueous solutions by two types of biochars produced from dairy manure（DMBC） and wood（WC） at 700 ℃ were examined. Compared to WC, DMBC had smaller specific surface area and less carbon content, but was more effective in removal of heavy metals from aqueous solutions. FTIR and XRD analyses showed that DMBC contained mineral phosphorus, which might precipitate heavy metal ions. This mechanism was supported by the similar results obtained from single and combined sorption of Pb（Ⅱ） and Cd（Ⅱ）. However, much lower sorption of metals on WC in coexistence than in single indicated that WC adsorbed metals primarily through surface adsorption. Our research shows that dairy manure-derived biochar could be applied to remove heavy metal ions from waters. |
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