Characterization of Bottom Ash as an Adsorbent of Lead from Aqueous Solutions
Characterization of Bottom Ash as an Adsorbent of Lead from Aqueous Solutions
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底灰作为水溶液中铅吸附剂的表征
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
L. Kim
中科院分区：
文献类型：
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作者：
Joan B. Gorme;M. C. Maniquiz;Soon;Y. Son;Y. Kim;L. Kim
本研究探讨了利用底灰作为吸附剂去除水溶液中铅（Pb）的潜力。测定了底灰的理化性质，并进行了一系列的浸出和吸附实验，以评价底灰作为吸附材料的适宜性。存在微量元素，如硅和铝，表明该材料具有良好的吸附能力。所有的重金属浸出在韩国标准浸出测试（KALCOST）通过安全处置的监管限制，而批量吸附实验表明，底灰是能够吸附铅（实验q e = 0.05毫克/克），其中的吸附率随粒径减小而增加。吸附数据，然后拟合动力学模型，包括Lagergren一级和伪二级，以及Elovich方程，和等温模型，包括Langmuir，Freundlich和Dubininin-Radushkevich等温线。结果表明，拟二级动力学模型是描述底灰吸附动力学的最佳动力学模型，Freundlich吸附等温式最能代表底灰对有机物的平衡吸附。底灰的最大吸附容量和吸附能分别为0.315 mg/g和7.01 KJ/mol。
This study investigated the potential of using bottom ash to be used as an adsorbent for the removal of lead (Pb) from aqueous solutions. The physical and chemical characteristics of bottom ash were determined, with a series of leaching and adsorption experi- ments performed to evaluate the suitability of bottom ash as an adsorbent material. Trace elements were present, such as silicon and aluminum, indicating that the material had a good adsorption capacity. All heavy metals leached during the Korea standard leaching test (KSLT) passed the regulatory limits for safe disposal, while batch adsorption experiments showed that bottom ash was capable of adsorbing Pb (experimental q e = 0.05 mg/g), wherein the adsorption rate increased with decreasing particle size. The adsorption data were then fitted to kinetic models, including Lagergren first-order and Pseudo-second order, as well as the Elovich equation, and isotherm models, including the Langmuir, Freundlich and Dubinin-Radushkevich isotherms. The results showed that pseudo-second order kinetics was the most suitable model for describing the kinetic adsorption, while the Freundlich isotherm best represented the equilibrium sorption onto bottom ash. The maximum sorption capacity and energy of adsorption of bottom ash were 0.315 mg/g and 7.01 KJ/mol, respectively.