| 市政污泥生物碳对重金属的吸附特性 |
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| 引用本文： | 李江山,薛 强,王 平,刘 磊.市政污泥生物碳对重金属的吸附特性[J].环境科学研究,2013,26(11):1246-1251. |
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| 作者姓名： | 李江山 薛 强 王 平 刘 磊 |
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| 作者单位： | 中国科学院武汉岩土力学研究所, 岩土力学与工程国家重点实验室, 湖北 武汉 430071 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项(2012ZX07104-002)；武汉市高新技术成果转化及产业化项目(2013060803010403)；国家重点基础研究发展计划(973)项目(2012CB719802) |
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| 摘 要： | 采用市政污泥在300℃缺氧条件下制得污泥生物碳,研究了污泥生物碳添加量、溶液pH及吸附反应时间对溶液中Pb2+、Cu2+、Zn2+吸附效果的影响,并分析了各因素影响机制及污泥生物碳对重金属的吸附机理. 结果表明,污泥生物碳对溶液中重金属的去除率与重金属水合离子半径呈负相关,随着污泥生物碳添加量的增加,溶液中重金属的去除率不断增加,但单位吸附量总体上呈下降趋势. 重金属吸附量随溶液pH的增加而增大,当溶液初始pH为6.00时,污泥生物碳对溶液中Pb2+、Cu2+和Zn2+的吸附量最大,分别达42.941、25.769和12.484mg/g. 伪二级动力学方程可有效描述溶液中重金属离子在生物碳上的吸附过程,重金属在污泥生物碳表面的吸附主要受化学反应控制,Pb2+、Cu2+和Zn2+的平衡吸附量分别为39.747、6.849和10.004mg/g,达到吸附平衡的时间为Pb2+＞Zn2+＞Cu2+.
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| 关 键 词： | 污泥 生物碳 重金属 吸附 |
| 收稿时间： | 2013/4/10 0:00:00 |
| 修稿时间： | 2013/8/1 0:00:00 |
Adsorption Properties of Municipal Sludge Biochar for Soluble Heavy Metals |
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| LI Jiang-shan,XUE Qiang,WANG Ping and LIU Lei.Adsorption Properties of Municipal Sludge Biochar for Soluble Heavy Metals[J].Research of Environmental Sciences,2013,26(11):1246-1251. |
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| Authors: | LI Jiang-shan XUE Qiang WANG Ping and LIU Lei |
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| Affiliation: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Sludge-derived biochars were prepared at 300℃ and hypoxia. The effects of addition amount, pH and contact time on adsorption of Pb2+,Cu2+,Zn2+ in solution by sludge-derived biochars were firstly investigated, and the influence and adsorption mechanisms were further discussed. The results showed that the removal rate of heavy metals in solution adsorbed by sludge derived biochar was inversely proportional to the hydrated ionic radius of heavy metals. The removal rate of heavy metals increased with the increase of sludge-derived biochars. However, the adsorption amount per unit mass decreased. The adsorption amount of heavy metals increased with the increase of pH in solution, and the maximum value appeared when pH was equal to 6.00.The adsorption capacities of Pb2+, Cu2+ and Zn2+ were 42.941,5.769and 12.484mg/g respectively. Pseudo second-order model can effectively describe the adsorption process of heavy metal ions on sludge-derived biochar, which was mainly controlled by the chemical reaction. The equilibrium adsorption capacities of Pb2+, Cu2+ and Zn2+ were 39.747,6.849and 10.004mg/g respectively, and the equilibrium time followed the order:Pb2+＞Zn2+＞Cu2+. |
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| Keywords: | sludge biochar heavy metal absorption |
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