Removal of methylene blue from aqueous solution by peat
Removal of methylene blue from aqueous solution by peat
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DOI：
10.1016/j.jhazmat.2006.10.053
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发表时间：
2007-06-01
影响因子：
13.6
通讯作者：
Sierra, M. M. D.
中科院分区：
文献类型：
--
作者：
Fernandes, A. N.;Almeida, C. A. P.;Sierra, M. M. D.
研究了泥炭对水溶液中亚甲基蓝（MB）的去除效果.这些泥炭是从巴西南部圣卡塔里纳州Arroio do Silva海滩的泥炭地收集的。使用不同初始浓度的MB溶液和三种不同温度（35、45和60 ° C）进行吸附。约4.5小时的吸附时间足以达到平衡的所有温度下，在研究的浓度范围内。百分比去除是更大的稀释的解决方案，但在平衡的MB吸附的泥炭的绝对量增加与初始浓度的增加，证实了作为吸附剂的材料的功效。反应温度对反应影响不大，为吸热反应。结果表明，一个多层次的过程和数据进行了分析，考虑伪一阶，伪二阶和粒子内扩散的方法。后两种机制似乎是重要的速率控制步骤。(C)2006 Elsevier B.V.保留所有权利。
In this study, the removal of methylene blue (MB) from aqueous solution by peat was analyzed. The peat was collected from a peatland at Arroio do Silva Beach, in Santa Catarina state, in the south of Brazil. Adsorption was conducted using varied initial concentrations of the MB solutions and three different temperatures (35, 45 and 60 degrees C). An adsorption time of around 4.5 h was sufficient to reach the equilibrium for all temperatures, in the concentration range studied. Percentage removal was greater for diluted solutions, but the absolute amount of MB adsorbed by the peat at equilibrium increased with an increase of the initial concentration, corroborating the efficacy of the material as an adsorbent. Temperature influenced slightly the reaction, which was endothermic. Results indicated a multi-layered process and the data were analyzed considering pseudo-first-order, pseudo-second-order and intraparticle diffusion approaches. The latter two mechanisms seem to be significant in the rate-controlling step. (C) 2006 Elsevier B.V. All rights reserved.