硅酸盐学报2011，Vol.39Issue(2)：371-376,6.
镁铝二元水滑石焙烧产物对酸性紫90染料的吸附性能
Adsorption Characteristics of Calcined Layered Double Hydroxides over Acid Violet 90
薛继龙 1倪哲明 1郑立 1王巧巧 1胥倩 1阮璐璐 1祝海涛1
作者信息
- 1. 浙江工业大学化学工程与材料学院,杭州,310032
- 折叠
摘要
Abstract
The adsorption characteristics of calcined layered double hydroxides with a Mg to AI mole ratio of 3:1 (MgAI-LDO, layered double oxide) were investigated to remove a weak acid dye acid violet 90(C40H27CrN8Na2O10S2, AV90). In the light of“memory effect”, MgAI-LDO is able to recover their original layered structure in an aquatic environment, after adsorption part of AV90 and CO32-(come from air) intercalated into interlayer of MgAI-LDHs, its structure was confirmed by X-ray diffraction and Fourier transform infrared spectra. The results of adsorption experiments indicate that the MgAI-LDO has a significant ability to remove AV90(500 mg·L-1) from the solution. The maximum equilibrium capacity Qe and removal rate η of AV90 are 999.78 mg/g and 99.7％,respectively. Adsorption isotherms show that the adsorption process is consistent with both Langmuir and Freundlich equations which is also spontaneous and exothermic. The kinetic model has been evaluated to fit the experimental data, and it is found that the pseudo-second-order best describes the adsorption kinetics of MgAl-LDO to Av90. In addition, adsorption of MgAl-LDO is higher than activated carbon, SiO2 and other traditional adsorbents. The regeneration for reuse of LDO after Av90 adsorption is feasible at least three cycles.关键词
镁铝二元水滑石焙烧产物/吸附/酸性紫/热力学参数/动力学Key words
calcined magnesium/aluminum layered double hydroxides/ adsorption/ acid violet/ thermodynamic parameters/ kinetics分类
化学化工引用本文复制引用
薛继龙,倪哲明,郑立,王巧巧,胥倩,阮璐璐,祝海涛..镁铝二元水滑石焙烧产物对酸性紫90染料的吸附性能[J].硅酸盐学报,2011,39(2):371-376,6.
