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Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH
Qian Wang;  Bing Wang;  Xinqing Lee;  Johannes Lehmann;  Bin Gao
2018
发表期刊Science of the Total Environment
卷号634页码:188-194
摘要

The use of biochar for the removal of heavy metals from water has environmental benefits. In order to elucidate the potential application of highly functionalized biochar for the removal of Pb(II) in aqueous solution, maple wood biochar was oxidized using hydrogen peroxide. The pH values of oxidized biochar ranged from 8.1 to 3.7, with one set being adjusted to a pH of 7 as a comparison. It was found that oxidizing the biochars increased their Pb(II) adsorption capacity if the pH remained below6 (strong oxidation), but decreased their Pb(II) adsorption ability above pH 6 (weak oxidation). After adjusting the pH of oxidized biochar to pH 7, the Pb(II) adsorption capacity further increased two to sixfold for oxidized biochars originally at pH 3.7-6. The adsorption characteristics of Pb(II) were well described by the Langmuir equation. Adsorption of Pb(II) was not fully reversible in water. Less than 6% of Pb(II) desorbed in water in two consecutive steps than was previously adsorbed, for biochars with a pH below 7, irrespective of oxidation. Recovery using an extraction with 0.1 M NaNO3 increased from 0.7% to 32.7% of Pb(II) undesorbed by both preceding water extractions with increasing oxidation, for biochars with a pH below 7. Unextractable Pb(II) was lower at low oxidation but increased to 99.0% of initially adsorbed amounts at low pH, which indicated that the adsorption of Pb(II) on oxidized biochar is pH independent. 

关键词Biochar lead adsorption retention ph Independent
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8775
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Department of Crop and Soil Sciences, Cornell University, 909 Bradfield Hall, Ithaca, NY 14853, USA
4.Atkinson Center for a Sustainable Future, Cornell University, Ithaca, NY 14853, USA
5.Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA
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Qian Wang;Bing Wang;Xinqing Lee;Johannes Lehmann;Bin Gao. Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH[J]. Science of the Total Environment,2018,634:188-194.
APA Qian Wang;Bing Wang;Xinqing Lee;Johannes Lehmann;Bin Gao.(2018).Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH.Science of the Total Environment,634,188-194.
MLA Qian Wang;Bing Wang;Xinqing Lee;Johannes Lehmann;Bin Gao."Sorption and desorption of Pb(II) to biochar as affected by oxidation and pH".Science of the Total Environment 634(2018):188-194.
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