Adsorption of Neutral Red onto Mn-impregnated activated carbons prepared from Typha orientalis.
Adsorption of Neutral Red onto Mn-impregnated activated carbons prepared from Typha orientalis.
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DOI：
10.1016/j.biortech.2008.05.018
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发表时间：
2008-12
影响因子：
11.4
通讯作者：
Jian Zhang;Q. Shi;Chenglu Zhang;Jingtao Xu;B. Zhai;Bo Zhang
中科院分区：
文献类型：
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作者：
Jian Zhang;Q. Shi;Chenglu Zhang;Jingtao Xu;B. Zhai;Bo Zhang
以廉价的可再生碳源香蒲（Typha orientalis）为原料，采用磷酸活化法制备活性炭，并以不同的锰盐浸渍活性炭，研究其对中性红（NR）的吸附性能。浸渍在活性炭中的Mn的量受阴离子物种的影响。Mn的浸渍降低了比表面积，改变了孔径和晶体结构，并引入了更多的酸性官能团，如羧基，内酯和苯酚基团。结果表明，当pH值为3.7，锰炭用量为0.100g/100 ml溶液，吸附时间为4.5h时，活性炭对锰的吸附效果最佳。吸附等温线符合Langmuir吸附等温式。动力学数据符合准二级动力学模型。热力学参数表明，该过程是自发的吸热过程。结果表明，所制备的锰改性活性炭是一种很有应用前景的中性红吸附剂。
Activated carbon was prepared from an inexpensive and renewable carbon source, Typha orientalis, by H3PO4activation and then impregnated with different Mn salts and tested for its Neutral Red (NR) adsorption capacities. The amount of Mn impregnated in the activated carbon was influenced by the anion species. Impregnation with Mn decreased the surface area, changed the pore size and crystal structure, and introduced more acidic functional groups such as carboxyl, lactone and phenol groups. The optimum adsorption performance for all the activated carbons was obtained at pH 3.7, Mn–Carbon dose of 0.100g/100ml solution and contact time 4.5h. The adsorption isotherms fit the Langmuir isotherm equation. The kinetic data followed the pseudo-second-order model. The thermodynamic parameters indicated that the processes were spontaneous and endothermic. According to these results, the prepared Mn modified activated carbons are promising adsorbents for the removal of Neutral Red from wastewater.