Adsorption of phenols by magnetic polysulfone microcapsules containing tributyl phosphate.
Adsorption of phenols by magnetic polysulfone microcapsules containing tributyl phosphate.
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DOI：
10.1016/j.cej.2009.12.008
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发表时间：
2010-03
影响因子：
15.1
通讯作者：
Juanjuan Yin;Rui Chen;Yongsheng Ji;Chuande Zhao;Guanghui Zhao;Haixia Zhang
中科院分区：
文献类型：
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作者：
Juanjuan Yin;Rui Chen;Yongsheng Ji;Chuande Zhao;Guanghui Zhao;Haixia Zhang
以磷酸三丁酯（TBP）为萃取剂，以磁性纳米颗粒（Fe3O4）为萃取剂，首次成功制备了多孔聚砜（PSF）微胶囊。利用傅里叶变换红外（FT-IR）、扫描电镜（SEM）、振动样品磁强计（VSM）和热重分析（TGA）等技术对微胶囊进行了表征。四种苯酚（4-氯苯酚，4-CP； 2-氯苯酚，2-CP； 4-硝基苯酚，4-NP；苯酚，Ph）从水溶液中吸附到磁性微胶囊上，然后在间歇系统中研究了接触时间（5-60min）、初始苯酚浓度（约99-1050mg /L）和Ph（2-12）的函数。结果表明，增加苯酚的初始浓度和吸附时间有利于吸附。相反，pH为bbbb6时，吸附量下降。采用Freundlich和Langmuir等温线对吸附数据进行建模，并计算相应的吸附参数。Freundlich方程比Langmuir方程更适合这四种酚。同时，研究了拟一阶、拟二阶和颗粒内扩散等动力学模型，确定了吸附机理。实验数据很好地拟合了伪二级动力学模型，表明颗粒内溶质扩散并不是控制吸附速率的唯一步骤。在对潜在工业应用的调查中，证明了用新型磁性微胶囊处理的苯酚的最终浓度将在允许的范围内。经过6次萃取和再生循环后，微胶囊的吸附性能基本不变。这些结果表明，这些新型磁性微胶囊在处理酚类环境污染方面具有潜在的应用前景。该研究拓宽了微胶囊的应用范围，目前微胶囊主要用于去除水中的重金属。
Porous polysulfone (PSF) microcapsules containing both tributyl phosphate (TBP) as extractant and magnetic nanoparticles (Fe3O4) that help the isolation operation have been successfully prepared for the first time using a phase inversion method. Several techniques, including Fourier transform infrared (FT-IR), scanning electron microscope (SEM), vibrating sample magnetometer (VSM) and thermogravimetric analysis (TGA) have been used to characterize the microcapsules. The adsorption of four kinds of phenols (4-chlorophenol, 4-CP; 2-chlorophenol, 2-CP; 4-nitrophenol, 4-NP; phenol, Ph) from aqueous solutions on to the magnetic microcapsules has then been studied in a batch system as a function of contact time (5–60min), initial phenols concentrations (about 99–1050mg/L) and pH (2–12). The results show that increasing the initial concentration of the phenols and the adsorption time favored the adsorption. In contrast, the adsorption decreased for pH>6. Adsorption data were modeled using Freundlich and Langmuir adsorption isotherms and the appropriate parameters were calculated. The Freundlich equation provided a better fit for the four phenols than the Langmuir equation. Simultaneously, various kinetic models including pseudo-first-order, pseudo-second-order and intraparticle diffusion were investigated to determine the mechanism of adsorption. The experimental data fitted the pseudo-second-order kinetic model well, and showed that intraparticle solute diffusion was not the only rate-controlling sorption step. In an investigation of potential industrial applications, it is demonstrated that the final concentration of phenols treated with the novel magnetic microcapsules will be within allowed limits. After six extraction and regeneration cycles, the microcapsules were unchanged and showed almost the same adsorption ability. These results demonstrate that these novel magnetic microcapsules have potential applications in the treatment of environmental pollution caused by phenols. This study broadens the application of microcapsules, which are, at the moment, mainly used to remove heavy metals from water.