Kinetics and isotherm studies of methylene blue adsorption onto polyaniline nanotubes base/silica composite
Kinetics and isotherm studies of methylene blue adsorption onto polyaniline nanotubes base/silica composite
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DOI：
10.1016/j.jiec.2012.05.012
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发表时间：
2012-11-25
影响因子：
6.1
通讯作者：
Stejskal, Jaroslav
中科院分区：
文献类型：
--
作者：
Ayad, Mohamad M.;Abu El-Nasr, Ahmed;Stejskal, Jaroslav
以聚苯胺纳米管（PANI NTs）基/二氧化硅复合材料为吸附剂，对水中的阳离子染料亚甲基蓝（MB）进行了吸附。实验采用紫外可见光谱学和不同的参数，即：MB的初始浓度和接触时间。随着初始染料浓度的增加，脱色率降低。平衡数据符合Langmuir等温线。Langmuir等温线最适合聚苯胺NTs基/二氧化硅复合材料对MB的吸附数据。实验数据采用了拟一阶、拟二阶动力学模型和颗粒内扩散模型。结果表明，拟二级动力学模型比其他动力学模型更能描述吸附过程。结果表明，聚苯胺纳米管基/二氧化硅复合材料可作为一种高效的吸附剂，比传统的聚苯胺基/二氧化硅复合粉末更能吸附染料。由爱思唯尔B.V.代表韩国工业与工程化学学会出版。
A cationic dye, such as methylene blue (MB), was adsorbed from water by using polyaniline nanotubes (PANI NTs) base/silica composite as adsorbent. Experiments were conducted by using the UV-visible spectroscopy and by varying parameters namely: initial concentration of MB and contact time. The percentage of color removal decreased with increase of initial dye concentration. Equilibrium data were fit to Langmuir isotherm. The Langmuir isotherm fits best the MB adsorption data on PANI NTs base/silica composite.The kinetic models: pseudo first order, pseudo-second order and the intraparticle diffusion models were applied to the experimental data. It was observed that pseudo-second order kinetic model described the adsorption process better than any other kinetic models. Results obtained indicate that PANI NTs base/silica composite could be employed as an efficient adsorbent much more than the conventional PANI base/silica composite powder for dye uptake. Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.