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首页> 外文会议>Progress in environmental science and technology.;vol. 3. >Removal of Cadmium from Aqueous Solution by Hydroxyapatite/manganese Dioxide Composite
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Removal of Cadmium from Aqueous Solution by Hydroxyapatite/manganese Dioxide Composite

机译：羟基磷灰石/二氧化锰复合材料去除水溶液中的镉

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摘要

A novel composite adsorbent, hydroxyapatite/manganese dioxide (HAp/MnO2), has been prepared for the purpose of removing cadmium ions from aqueous solution. The combination of HAp with MnO2 aims to increase the adsorption capacity. Varying factors that may affect the adsorption efficiency, including solution pH and coexistent substances such as humic acid and competing cations (Ca2+, Mg2+), have been investigated. It is remarkable that using the developed composite absorbent, more than 99% of Cd2+ions can be removed under desirable experimental conditions, the maximum adsorption capacity is 169.5 mg.g-1. Solution pH and coexisting substances have no significant influence on the removal efficiency of Cd2+under the experimental conditions. Mechanistic studies show that the adsorption data fits the Langmuir isotherm model reasonably well and the adsorption processes obeys the pseudo-second-order kinetics model. Based on the experiment results, it is concluded that HAp/MnO2 composite has been shown to be as an effective adsorbent with high adsorption capacity for removing Cd2+from aqueous solution.
机译：为了从水溶液中去除镉离子，已经制备了一种新型的复合吸附剂，羟基磷灰石/二氧化锰（HAp / MnO2）。 HAp与MnO2的结合旨在提高吸附能力。已经研究了可能影响吸附效率的各种因素，包括溶液的pH值和共存的物质，例如腐殖酸和竞争性阳离子（Ca2 +，Mg2 +）。值得注意的是，使用开发的复合吸收剂，可以在理想的实验条件下去除99％以上的Cd2 +离子，最大吸附容量为169.5 mg.g-1。在实验条件下，溶液的pH值和共存物质对Cd2 +的去除效率没有显着影响。机理研究表明，吸附数据很好地拟合了Langmuir等温线模型，并且吸附过程服从拟二级动力学模型。根据实验结果，可以得出结论，HAp / MnO2复合材料是一种有效的吸附剂，具有很高的吸附能力，可以从水溶液中去除Cd2 +。

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