两步改性海泡石对酸性橙Ⅱ的吸附：优化、吸附性能、动力学、热力学和再生。
Adsorption of Acid Orange Ⅱ with Two Step Modified Sepiolite: Optimization, Adsorption Performance, Kinetics, Thermodynamics and Regeneration.
机构信息
Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China.
Department of Chemical Engineering, Process Engineering for Sustainable Systems (ProcESS), KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.
出版信息
Int J Environ Res Public Health. 2020 Mar 6;17(5):1732. doi: 10.3390/ijerph17051732.
In this study, a two-step modification of sepiolite for adsorption enhancement was investigated. The cetyltrimethylammonium bromide (CTAB) was utilized for the organic modification process after a heat modification. To develop the optimal modification condition, adsorption of Acid Orange II onto modified sepiolite was investigated with respect to heat temperature and adsorbent dosage. The temperature of 200 °C and 100% cation exchange capacity (CEC) was deemed as the optimal condition. The impacts of operation conditions on adsorption procedure, including pH, adsorbent dosage and adsorption duration, were comprehensively discussed. The adsorption of Acid Orange II by sepiolite is in accordance with the quasi-secondary kinetic model. Moreover, the results of intraparticle diffusion indicate that the intraparticle diffusion was the dominant adsorption force in the initial adsorption period. The adsorption process was obeyed with the Langmiur adsorption model. The results from regeneration procedure suggest that the superior regeneration obtained with 0.8 mol/L NaOH concentration.
本研究采用两步法对海泡石进行修饰以增强其吸附性能。首先对海泡石进行热改性，然后用十六烷基三甲基溴化铵（CTAB）进行有机修饰。为了开发最佳的修饰条件，我们研究了改性海泡石对酸性橙 II 的吸附性能，考察了热改性温度和吸附剂用量对吸附效果的影响。结果表明，200°C 和 100%阳离子交换容量（CEC）为最佳条件。此外，我们还全面讨论了操作条件对吸附过程的影响，包括 pH 值、吸附剂用量和吸附时间等。实验结果表明，酸性橙 II 在海泡石上的吸附符合准二级动力学模型。同时，内扩散实验结果表明，在初始吸附阶段，内扩散是主要的吸附驱动力。此外，吸附过程符合 Langmuir 吸附模型。再生实验结果表明，在 0.8 mol/L NaOH 浓度下可以实现较好的再生效果。
Zotero 插件