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首页> 美国卫生研究院文献>Materials >Adsorption Property Kinetic and Equilibrium Studies of Activated Carbon Fiber Prepared from Liquefied Wood by Zncl2 Activation
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Adsorption Property Kinetic and Equilibrium Studies of Activated Carbon Fiber Prepared from Liquefied Wood by Zncl2 Activation

机译：Zncl2活化液化木材制备活性炭纤维的吸附性能动力学和平衡研究

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摘要

Activated carbon fiber was prepared from liquefied wood by chemical activation with ZnCl2 (Z-LWACF) at different impregnation ratios, with a particular focus on its adsorption property, kinetic and isotherm. The characterization and properties of Z-LWACFs were investigated by nitrogen adsorption/desorption, X-ray photoelectron spectroscopy (XPS), methylene blue (MB) and iodine adsorption. Two activation process methods were employed to prepare Z-LWACF and contrasted with others fibers. The results showed that the Z-LWACF obtained by one-step ZnCl2 activation present higher yields and specific surface area than others fibers. Besides, the change of MB adsorption value at different impregnation ratios was consistent with pore structure distribution above 1.5 nm pore size, indicating that larger micropores (1.5 to 2 nm) and mesopores played a major role in the MB adsorption by Z-LWACF. The kinetics of MB adsorption process was found to follow the pseudo-second-order kinetic model and the adsorption rate was controlled by chemisorption. It was also found that MB adsroption by Z-LWACF belonged to monolayer adsorption and Z-LWACF was easy to adsorb MB.
机译：活性炭纤维是由液化木材通过用不同浸渍率的ZnCl2（Z-LWACF）进行化学活化而制备的，特别关注其吸附性能，动力学和等温线。通过氮吸附/解吸，X射线光电子能谱（XPS），亚甲基蓝（MB）和碘吸附研究了Z-LWACF的表征和性质。采用两种活化方法制备Z-LWACF，并与其他纤维进行对比。结果表明，单步ZnCl2活化获得的Z-LWACF比其他纤维具有更高的产率和比表面积。此外，不同浸渍率下MB吸附值的变化与孔径大于1.5 nm的孔结构分布一致，表明较大的微孔（1.5至2 nm）和中孔在Z-LWACF吸附MB中起主要作用。发现MB吸附过程的动力学遵循伪二级动力学模型，并且通过化学吸附控制吸附速率。还发现Z-LWACF对MB的吸附属于单层吸附，Z-LWACF易于吸附MB。

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