State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, 222 Tianshui Road, Lanzhou 730000, China.
J Hazard Mater. 2010 Mar 15;175(1-3):715-25. doi: 10.1016/j.jhazmat.2009.10.068. Epub 2009 Oct 27.
This study investigated the potential of capsules containing 1-nonanol for the adsorption of phenol at high initial concentrations. The polysulfone capsules containing 1-nonanol (PSF@1-nonanol capsules) were successfully prepared with a phase inversion method, and the results showed that 1-nonanol was encapsulated with polysulfone as an encapsulation capacity of 67.99% was achieved. Systematic studies on phenol adsorption equilibrium, kinetics and isotherms by PSF@1-nonanol capsules were carried out. The results showed that the rate of adsorption of phenol is initially quite rapid and equilibrium is reached in about 90 min. Phenol adsorption uptake was found to increase with increase in initial concentration and adsorption time, whereas adsorption of phenol was more favourable at acidic pH and low temperature. The adsorption kinetics of phenol followed pseudo-second-order model, and the best fits of adsorption isotherms were achieved with the Freundlich equation. These results demonstrate that the use of PSF@1-nonanol capsules enhanced the mass transfer rate and the uptakes to phenol at high initial concentrations. Furthermore, after seven times of repeated extraction and stripping, the microcapsules kept almost the same adsorption ability, which indicated that the PSF@1-nonanol capsules have very good stability in the adsorption process. Therefore, PSF@1-nonanol capsules can be taken as an ideal adsorbent for rapid removal of high concentration phenol from aqueous solution.
本研究考察了含有 1-壬醇的胶囊在高初始浓度下吸附苯酚的潜力。采用相转化法成功制备了含有 1-壬醇的聚砜胶囊（PSF@1-壬醇胶囊），结果表明 1-壬醇被聚砜包裹，封装容量达到 67.99%。对 PSF@1-壬醇胶囊进行了苯酚吸附平衡、动力学和等温线的系统研究。结果表明，苯酚的吸附速率起初相当快，约 90 分钟即可达到平衡。发现苯酚的吸附量随初始浓度和吸附时间的增加而增加，而在酸性 pH 和低温下，苯酚的吸附更有利。苯酚的吸附动力学符合准二级模型，吸附等温线的最佳拟合是用 Freundlich 方程。这些结果表明，PSF@1-壬醇胶囊的使用提高了高初始浓度下苯酚的传质速率和吸附量。此外，经过七次重复萃取和汽提后，微胶囊保持几乎相同的吸附能力，这表明 PSF@1-壬醇胶囊在吸附过程中具有很好的稳定性。因此，PSF@1-壬醇胶囊可以作为一种理想的吸附剂，用于快速去除水溶液中的高浓度苯酚。
