| 引用本文： |
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王一兵,柯珂,雷富,许铭本.非活性马尾藻对水中Cd2+和Ni2+的生物吸附及脱附研究[J].广西科学,2014,21(4):370-375. [点击复制]
- WANG Yi-bing,KE Ke,LEI Fu,XU Ming-ben.Biosorption and Desorption of Cd2+ and Ni2+ Ions by Dead Sargassum sp.[J].Guangxi Sciences,2014,21(4):370-375. [点击复制]
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| 摘要: |
| [目的]以马尾藻粉为生物吸附剂,研究其在静态实验中对Cd2+和Ni2+的吸附及脱附能力,并对吸附速度、动力学、重金属选择性和吸附剂再生等问题进行探讨。[方法]采用单因素法分析pH值、初始浓度、平衡离子类型等条件因素对重金属吸附容量的影响,采用准一级和准二级动力学模型对Cd2+、Ni2+的吸附数据进行拟合。[结果]Cd2+的最佳吸附条件为pH值4.5、初始浓度500mg/L、平衡离子为NO3-,Ni2+的最佳吸附条件为pH值3.0、初始浓度900mg/L、平衡离子为Cl-;Cd2+、Ni2+的吸附平衡到达时间分别为50min和25min;准二级动力学模型对吸附数据的拟合效果更好,相关系数(R2)均大于0.99;对混合溶液中不同重金属的选择性吸附顺序为Pb2+ > Ni2+ > Cd2+ > Mn2+;1.0mol/L HCl对Cd2+、Ni2+的理论洗脱率均可达到99%。[结论]马尾藻粉对Cd2+和Ni2+的吸附容量大,吸附条件温和,重金属脱附率高,是一种性能良好的生物吸附剂。 |
| 关键词: 马尾藻 重金属 生物吸附 条件优化 吸附动力学 |
| DOI： |
| 投稿时间：2013-12-17修订日期：2014-01-10 |
| 基金项目:广西自然科学基金项目(2011GXNSFE018002,桂科自0991076,2012GXNSFEA053001),广西科学院基本科研业务费项目(08YJl6HY01,11YJ24HY03)资助。 |
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| Biosorption and Desorption of Cd2+ and Ni2+ Ions by Dead Sargassum sp. |
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WANG Yi-bing, KE Ke, LEI Fu, XU Ming-ben
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| (Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Sciences Nanning, Guangxi, 530007, China) |
| Abstract: |
| [Objective] The abilities of dead Sargassum sp.biomass as a biosorbent for removing and recovering Cd2+ and Ni2+ ions from aqueous solutions were studied in batch experiments.Adsorption velocity, kinetics, metal selection and absorbent regeneration were also investigated in this work.[Methods] On the basis of single factor analysis, the effects of adsorption parameters, such as pH, initial concentration and counter ions, on uptake capacities of Cd2+ and Ni2+ were evaluated.The adsorption data were fitted by the pseudo-first and pseudo-second order kinetics.[Results] The optimal adsorption factors for Cd2+ were pH of 4.5, initial concentration of 500mg/L, counter ions of NO-3, and the optimal adsorption factors for Ni2+ were pH of 3.0, initial concentration of 900mg/L, counter ion of Cl-.The equilibrium time for Cd2+ and Ni2+ was 50min and 25min, respectively.Both adsorptions of Cd2+ and Ni2+ onto Sargassum sp.were in good agreement with the pseudo-second order kinetic model, and the correlation coefficients (R2) were above 0.99.The order of selectivity for different heavy metal ions in a mixed solution was Pb2+ > Ni2+ > Cd2+ > Mn2+.The desorption rates of Cd2+ and Ni2+ reached 99% in theory by using 1.0mol/L HCl as a desorption reagent.[Conclusion] These results illuminated that dead Sargassum sp.is an excellent biosorbent for removing and recovery heavy metals from aqueous solution, and it has a broad perspectives in industrial application in the future. |
| Key words: Sargassum sp. heavy metal biosorption optimization adsorption kinetics |
