Kinetic and equilibrium studies on the removal of Congo red from aqueous solution using Eucalyptus wood (Eucalyptus globulus) saw dust
Kinetic and equilibrium studies on the removal of Congo red from aqueous solution using Eucalyptus wood (Eucalyptus globulus) saw dust
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DOI：
10.1016/j.jtice.2012.09.013
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发表时间：
2013-01-01
影响因子：
5.7
通讯作者：
Babu, P. V. Vijay
中科院分区：
文献类型：
--
作者：
Mane, Venkat S.;Babu, P. V. Vijay
采用氢氧化钠对桉木锯屑（SD）进行处理，以提高其对水溶液中刚果红的吸附能力。采用SEM、FTIR、TGA和XRD等手段对氢氧化钠处理后的木屑进行了表征。SD的BET比表面积、孔容和平均孔径分别为0.3742 m2/g、0.00836 cm 3/g和893.6埃。SD的平均粒径为182.8 μ m。SD的堆积密度为212 kg/m2。SD的孔隙度为0.3。平衡和动力学吸附研究进行了使用SD。研究了初始pH、接触时间、吸附剂投加量、初始浓度和温度等操作参数对刚果红去除效果的影响。刚果红的吸附数据拟合各种等温模型。结果表明，Redlich和Peterson（R-P）模型拟合较好。吸附的最适pH为7。吸附动力学研究表明，SD对刚果红的吸附是一个渐进的过程，在4 h内达到准平衡。所得数据也适用于伪一阶、伪二阶和Weber-Morris方程。吸附速率符合准二级动力学。刚果红的吸附随温度的升高而增加，表明吸附过程的吸热性质。计算了自由能、焓变和熵变等热力学参数。该吸附剂被认为是有效的和经济上可行的。(C)2012台湾化学工程师学会。Elsevier B. V.出版，保留所有权利。
Eucalyptus wood (Eucalyptus globulus) saw dust (SD) was treated using sodium hydroxide to improve adsorption capacity for the removal of Congo red from aqueous solutions. The treated saw dusts using sodium hydroxide was evaluated through SEM, FTIR, TGA and XRD. The Brunauer-Emmett-Teller (BET) surface area, pore volume and average pore diameter of SD were 0.3742 m(2)/g, 0.00836 cm(3)/g and 893.6 angstrom. Average particle size of SD was 182.8 mu m. Bulk density of SD was 212 kg/m(2). The porosity of SD is 0.3. Equilibrium and kinetic adsorption studies were carried using SD. The effect of various operating parameters like initial pH, contact time, adsorbent dose, initial concentration and temperature on the removal of Congo red has been studied. The Congo red adsorption data were fitted to various isotherm models. It was found that Redlich and Peterson (R-P) model fitted well. The optimum pH for the adsorption was 7. The kinetics of adsorption showed that the Congo red adsorption on SD is a gradual process with quasi-equilibrium being attained in 4 h. The data obtained were also applied to pseudo first-order, pseudo second-order and Weber-Morris equations. The rates of adsorption were found to conform to pseudo second-order kinetics. The adsorption of the Congo red increased with increasing temperature indicating the endothermic nature of the adsorption process. Thermodynamic parameters such as free energy, enthalpy and entropy change were calculated. This adsorbent was found to be both effective and economically viable. (C) 2012 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.