Adsorption of Copper Ions and Methylene Blue in a Single and Binary System on Wheat Straw
Adsorption of Copper Ions and Methylene Blue in a Single and Binary System on Wheat Straw
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DOI：
10.1021/je900220q
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发表时间：
2009-06
影响因子：
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通讯作者：
Yongjun Wu;Lijun Zhang;Congli Gao;J. Ma;Xinghua Ma;R. Han
中科院分区：
文献类型：
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作者：
Yongjun Wu;Lijun Zhang;Congli Gao;J. Ma;Xinghua Ma;R. Han
以天然麦草为吸附剂，对水溶液中的铜和亚甲基蓝(MB)进行了吸附。采用间歇吸附体系研究了单一体系和二元体系在麦草上对Cu2+和MB的吸附行为。在单一体系中，在pH值为4.0~10.0的范围内，麦草对甲基溴的吸附量没有显著差异。而对于Cu2+，最适pH约为5。动力学研究表明，麦草对Cu2+和MB的吸附符合Elovich方程。铜的吸附等温线符合Langmuir和Redlich−-Peterson模型，MB的吸附符合Redlich-−-Peterson等温线。在273K、pH为5时，对Cu2+和MB的吸附容量分别为(7.0 5)mg·g−1和6 0.6 6 mg·g DNA 1。在二元体系中，Cu2+和MB表现为竞争吸附。随着Cu2+或MB浓度的增加，对Cu2+或MB的吸附显著降低。亚甲基蓝对Cu2+的吸附量影响更大，这是因为W对Cu2+具有较高的亲和力。
A natural wheat straw was used as adsorbent for removal of copper and methylene blue (MB) from aqueous solution. A batch system was applied to study the behavior of Cu2+ and MB adsorption in single and binary systems on wheat straw. In the single systems, there was no significant difference in the quantity of MB adsorbed onto wheat straw within a pH range of 4.0 to 10.0. But for Cu2+, the optimal pH is about 5. Kinetic studies indicate that Cu2+ and MB adsorption on the wheat straw follows the Elovich equation. The Cu2+ adsorption isotherm follows the Langmuir and Redlich−Peterson models, while MB adsorption follows the Redlich−Peterson isotherm. The adsorption capacities of Cu2+ and MB at 273 K and pH 5 are (7.05 and 60.66) mg·g−1, respectively. In the binary system, Cu2+ and MB exhibited competitive adsorption. The adsorption of Cu2+ or MB is considerably reduced with an increasing concentration of the other. The quantity of Cu2+ adsorbed is more strongly influenced by MB due to the higher affinity of w...