华侨大学学报（自然科学版）2018，Vol.39Issue(3)：389-395,7.DOI:10.11830/ISSN.1000-5013.201711074
改性蒙脱石的电动性质及吸附直接大红染料性能
Zeta-Potential of Modified Montmorillonite and Its Effect on Adsorption Capacity for Direct Red Dye From Aqueous Solutions
摘要
Abstract
Various compounds were used to alter montmorillonite,to prepare modified montmorillonites with different zeta-potentials(ζ-potential)as adsorbents for removal of the direct red dye from the aqueous solu-tion.The impact of theζ-potential of montmorillonite on the adsorption capacity toward dye was investigated. The results showed that the values ofζ-potential have a prominent effect on its adsorptive affinity for dye.The modified montmorillonites,such as Al13-M and Ni-phen-M,showed higher decoloring performance with the decolorization rate over 90%.The adsorption of dye on Ni-phen-M was pH value independent.Futhermore, the kinetics of the interactions for Al13-M toward dye was best described by pseudo-first-order mechanism,but Ni-phen-M followed the pseudo-second-order model.It was also found that the rate-limiting step of Al13-M was more likely to be liquid film diffusion as compared to Ni-phen-M,of which the rate-limiting step was intra-particle diffusion.Thermodynamic studies showed that the adsorption of Al13-M and Ni-phen-M were well de-scribed by Langmuir and Freumdlich isotherm model,respectively.The adsorption capacity of both were about 22 mg·g-1.关键词
蒙脱石/电动电位/吸附性能/直接大红染料Key words
montmorillonite/zeta-potential/adsorption properties/direct red dye分类
化学化工引用本文复制引用
叶玲,张敬阳,肖子敬..改性蒙脱石的电动性质及吸附直接大红染料性能[J].华侨大学学报（自然科学版）,2018,39(3):389-395,7.基金项目
福建省自然科学基金资助项目(D1310018) （D1310018）
福建省科技计划项目(2015H0024) （2015H0024）
