College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, College of Resources and Environment, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou 730000, PR China.
J Hazard Mater. 2011 Apr 15;188(1-3):296-303. doi: 10.1016/j.jhazmat.2011.01.107. Epub 2011 Feb 2.
Zirconium phosphate (ZrP) was immobilized by microencapsulation process of polysulfone (PSF) to form the polysulfone capsules containing ZrP (PSF@ZrP capsules) successfully by using phase inversion precipitation technique, and the PSF@ZrP was employed as capsules adsorbents to remove Pb(2+) presented in aqueous solution. The result shows that an encapsulation capacity of 50% (mass ratio, PSF: ZrP = 1:1) should be the optimal proportion of ZrP encapsulated with PSF. The characterization of the macroscopical and microcosmic physical properties of the resulting PSF@ZrP capsules was carried out by the DTA-TG, XRD, BET and SEM. Meanwhile, the adsorption properties of the PSF@ZrP capsules for Pb(2+) were investigated by batch methods. It was found that the adsorption of the PSF@ZrP capsules for Pb(2+) would be pH dependent due to the ion-exchange mechanism, and the uptake of Pb(2+) was slightly influenced with the concentration of coexisting cations (Na(+), K(+)) in a low range. Furthermore, the calculated thermodynamics parameters exhibit that the nature of the adsorption process is spontaneous and exothermic. After six times of adsorption-regeneration cycles, no significant loss of adsorption capacity was observed, indicating the good stability of the PSF@ZrP capsules. Consequently, the PSF@ZrP capsules in this work can provide a potential application for treatment process of Pb(2+)-containing wastewater.
磷酸锆（ZrP）通过聚砜（PSF）的微胶囊化过程固定化，成功地通过相转化沉淀技术形成含有 ZrP 的聚砜胶囊（PSF@ZrP 胶囊），并将 PSF@ZrP 用作胶囊吸附剂去除水溶液中的 Pb(2+)。结果表明，ZrP 与 PSF 的最佳包封比例应为 50%（质量比，PSF：ZrP=1：1）。采用 DTA-TG、XRD、BET 和 SEM 对所得 PSF@ZrP 胶囊的宏观和微观物理性能进行了表征。同时，采用批量法研究了 PSF@ZrP 胶囊对 Pb(2+)的吸附性能。发现由于离子交换机制，PSF@ZrP 胶囊对 Pb(2+)的吸附会受到 pH 值的影响，并且在低浓度范围内，共存阳离子（Na(+)、K(+)）的浓度对 Pb(2+)的摄取影响不大。此外，计算出的热力学参数表明，吸附过程的性质是自发的和放热的。经过六次吸附-再生循环，没有观察到吸附容量的明显损失，表明 PSF@ZrP 胶囊具有良好的稳定性。因此，本文中的 PSF@ZrP 胶囊可为含 Pb(2+)废水的处理工艺提供潜在的应用。
