Removal of lead from aqueous solution by hydroxyapatite/magnetite composite adsorbent
Removal of lead from aqueous solution by hydroxyapatite/magnetite composite adsorbent
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DOI：
10.1016/j.cej.2010.10.027
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发表时间：
2010-12-15
影响因子：
15.1
通讯作者：
Zhao, Jianfu
中科院分区：
文献类型：
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作者：
Dong, Lijing;Zhu, Zhiliang;Zhao, Jianfu
羟基磷灰石/磁铁矿（HAp/Fe_3O_4）复合吸附剂。已制备用于从水溶液中去除铅离子的目的。不同的因素，可能会影响吸附效率，包括吸附剂的用量，溶液的pH值和共存物质，如腐殖酸和竞争阳离子（Ca ~（2+），Mg ~（2+），K ~+和Na ~+），进行了研究。在适宜的实验条件下，复合吸附剂对Pb 2+的去除率可达99%以上。HAp/Fe_3O_4的最大吸附容量为598.8mg/g，远大于以往报道的材料。研究发现，腐殖酸影响除铅效率，但取决于其浓度，K+、Ca ~（2+）、Na+、Mg ~（2+）对土壤pH值的影响较小。吸附机理研究表明，吸附数据符合Langmuir和Freundlich等温模型，吸附过程符合准二级动力学模型。实验结果表明，HAp/Fe 3 O 4对铅的吸附是溶解/沉淀和表面络合作用共同作用的结果，这与HAp/Fe 3 O 4的多功能性有关。(C)2010 Elsevier B. V.保留所有权利。
A novel composite adsorbent, hydroxyapatite/magnetite (HAp/Fe3O4). has been prepared for the purpose of removing lead ions from aqueous solution. Varying factors that may affect the adsorption efficiency, including adsorbent dosage, solution pH and coexistent substances such as humic acid and competing cations (Ca2+, Mg2+, K+ and Na+), have been investigated. It is remarkable that using the developed composite absorbent, more than 99% of Pb2+ can be removed under desirable experimental conditions. The maximum adsorption capacity for HAp/Fe3O4 is 598.8 mg/g, which is much greater than that for the previously reported materials. It is found that depending on its concentrations, humic acid affects the efficiency of lead removal, but the coexisting cations, e.g., K+, Ca2+, Na+ and Mg2+, have small influence. Mechanistic studies show that the adsorption data fits the Langmuir and Freundlich isotherm models reasonably well and the adsorption processes obey the pseudo-second-order kinetics model. Based on the experiment results, it is concluded that dissolution/precipitation and the surface complexation are mutually responsible for lead adsorption on HAp/Fe3O4, which should be attributed to the multiple functionalities of the material. (C) 2010 Elsevier B.V. All rights reserved.