Effect of adsorbents and chemical treatments on the removal of strontium from aqueous solutions
Effect of adsorbents and chemical treatments on the removal of strontium from aqueous solutions
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DOI：
10.1016/j.jhazmat.2010.06.067
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发表时间：
2010-10-15
影响因子：
13.6
通讯作者：
Bastami, T. Rohani
中科院分区：
文献类型：
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作者：
Ahmadpour, A.;Zabihi, M.;Bastami, T. Rohani
在本研究中，三种不同的固体废物，即杏仁壳、茄子壳和苔藓，最初被处理并作为吸附剂从水溶液中吸附锶离子。实验证明，吸附剂类型和化学处理对锶离子的吸附有很好的影响。在三种吸附剂中，杏仁绿壳在不同溶液中对锶离子表现出较强的亲和力。在不同的化学处理、不同的吸附剂用量、初始金属离子浓度等实验条件下，考察了这种新型吸附剂在间歇吸附模式下的吸附效果。对于45 mg和102 mg L-1溶液，吸附锶(II)的最佳用量分别为0.2g和0.3g。只有在与吸附剂接触的前3min，才能达到较高的吸附效率。考察了锶(II)在杏仁壳上的吸附动力学，发现吸附符合准二级行为。Langmuir和Freundlich模型均能很好地预测实验吸附等温线数据。杏仁绿壳的最大吸附容量为116.3 mg g(-1)。本研究还证实，这些低成本的农副产品可以作为从废水中去除锶的有效吸附剂。(C)2010爱思唯尔B.V.保留所有权利。
In the present investigation, three different solid wastes namely almond green hull, eggplant hull, and moss were initially treated and used as adsorbents for the adsorption of strontium ion from aqueous solutions. Adsorbent types and chemical treatments are proved to have effective roles on the adsorption of Sr(II) ion. Among the three adsorbents, almond green hull demonstrated strong affinity toward strontium ion in different solutions. The effectiveness of this new adsorbent was studied in batch adsorption mode under a variety of experimental conditions such as: different chemical treatments, various amounts of adsorbent, and initial metal-ion concentration. The optimum doses of adsorbent for the maximum Sr(II) adsorption were found to be 0.2 and 0.3 g for 45 and 102 mg L-1 solutions, respectively. High Sr(II) adsorption efficiencies were achieved only in the first 3 min of adsorbent's contact time. The kinetics of Sr(II) adsorption on almond green hull was also examined and it was observed that it follows the pseudo second-order behavior. Both Langmuir and Freundlich models well predicted the experimental adsorption isotherm data. The maximum adsorption capacity on almond green hull was found to be 116.3 mg g(-1). The present study also confirmed that these low cost agriculture byproducts could be used as efficient adsorbents for the removal of strontium from wastewater streams. (C) 2010 Elsevier B.V. All rights reserved.