Citation: ZHANG Tian-Yong, YANG Qiu-Sheng, SHI Hui-Xian, HAN Cong, LIU Xu. Adsorption of Naphthalene on a Viscose-Based Activated Carbon Fiber[J]. Acta Physico-Chimica Sinica, 2010, 26(02): 367-372. doi: 10.3866/PKU.WHXB20100221
萘在粘胶基活性炭纤维上的吸附
研究了水溶液中萘在粘胶基活性炭纤维(VACF)吸附剂上的等温吸附. 用多种吸附方程(Langmuir、Freundlich、Dubinin-Radushkevitch (D-R)、Dubinin-Astalov (D-A)、Langmuir-Freundlich (L-F)、Redlich-Peterson (R-P))对吸附实验数据进行拟合, 考察了温度、pH和负载铜离子对萘吸附的影响. 方程拟合结果表明微孔吸附容积填充理论对VACF吸附萘有较好的适用性, 优于单层吸附理论. 在20-40 ℃之间, 萘的吸附是自发进行的, 30 ℃以上时, 萘的吸附量显著降低. 提出了新的机理来解释pH较低时吸附量显著上升的实验现象. 负载铜离子后VACF对萘吸附量降低.
English
Adsorption of Naphthalene on a Viscose-Based Activated Carbon Fiber
We studied the isothermal adsorption of naphthalene on a viscose-based activated carbon fiber (VACF) in aqueous solution. The adsorption experimental data were fitted to adsorption equations such as the Langmuir, Freundlich, Dubinin-Radushkevitch(D-R), Dubinin-Astalov(D-A), Langmuir-Freundlich(L-F), and Redlich-Peterson (R-P) equations. The effects of temperature, pH, and pre-loaded copper ions on the VACF on the adsorption of naphthalene were investigated. The fitting results show that the micropore volume filling theory fits better than the single-layer adsorption theory for naphthalene adsorption onto VACF. The adsorption of naphthalene occurs spontaneously between 20 and 40 ℃. The adsorption capacity of VACF for naphthalene decreases significantly above 30 ℃. A new mechanism is proposed to explain why the adsorption capacity increases significantly in lower pH aqueous solutions. The reduction of naphthalene takes place on the VACF with pre-loaded copper ions.
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Key words:
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Adsorption
- / Activated carbon fiber
- / Naphthalene
- / Adsorption equation
- / Copper ion
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