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| Adsorption of Arsenic(Ⅲ) on Biochar-manganese Oxide Composites |
| Received:June 30, 2014 |
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| KeyWord:biochar-manganese oxide composite;arsenic(Ⅲ);adsorption |
| Author Name | Affiliation | E-mail | | YU Zhi-hong | Centre for Research in Ecotoxicity and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | HUANG Yi-fan | Centre for Research in Ecotoxicity and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIAN Fei | Centre for Research in Ecotoxicity and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | XIE Li-kun | Centre for Research in Ecotoxicity and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LIU Shuang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science, Beijing 100086, China | | | SONG Zheng-guo | Centre for Research in Ecotoxicity and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | forestman1218@163.com |
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| Abstract: |
| Both biochar and manganese oxide are good adsorbents for metals. However there is little information about metal adsorption on their composited material. In this study, the adsorption of arsenic(Ⅲ) on manganese oxide-modified biochar was investigated under different contact time, adsorbent doses and solution pH, using batch adsorption method. The arsenic(Ⅲ) adsorption on both unmodified biochar and biochar-manganese oxide composite was rapid, reaching adsorption equilibrium within 30 min. The adsorption behavior could be well described with pseudo-second-order kinetic equation with a R2>0.99. The adsorption process appeared to be a multistep process that could be fitted with an intraparticle diffusion model. The maximum capacity of arsenic(Ⅲ) adsorption increased from 11.41(unmodified biochar)to 20.08 mg·g-1(manganese oxide modified biochar), which should be attributed to the increase of adsorption sites on the surface of biochar-manganese oxide composite due to the presence of manganese oxides. The effect of solution pH on arsenic(Ⅲ) adsorption was negligible in pH 3~7. The present results show that biochar-manganese oxide composite is a promising functional adsorbent as it is easy to be synthesized and works well in a wide pH range. |
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