Hasan Shameem, Iasir A Rafi M, Ghosh Tushar K, Sen Gupta Bhaskar, Prelas Mark A
Perma-Fix Environmental Services, Inc., 8302 Dunwoody Place, Suite 250, Atlanta, GA 30350, USA.
Nuclear Science and Engineering Institute, University of Missouri, Columbia, MO 65211, USA.
Healthcare (Basel). 2019 Mar 26;7(1):52. doi: 10.3390/healthcare7010052.
Fuller's earth spherical beads using chitosan as a binder were prepared for the removal of strontium ions from aqueous solution. The adsorbents were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), which revealed the porous nature of the beads. The Brunauer⁻Emmett⁻Teller (BET) surface area of the beads was found to be 48.5 m²/g. The adsorption capacities of the beads were evaluated under both batch and dynamic conditions. The adsorption capacity was found to be ~29 mg/g of adsorbent at 298 K when the equilibrium concentration of strontium in the solution was 925 mg/L at pH 6.5. The X-ray photoelectron spectroscopy (XPS) data suggest that strontium uptake by the beads occurs mainly through an ion-exchange process. Kinetic data indicate that the sorption of strontium onto the beads follows anomalous diffusion. Thermodynamic data suggest that the ion-exchange of Sr on the bead surface was feasible, spontaneous and endothermic in nature.
制备了以壳聚糖为粘结剂的富勒土球形珠粒，用于从水溶液中去除锶离子。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对吸附剂进行了表征，结果显示珠粒具有多孔性质。发现珠粒的布鲁诺尔-埃米特-特勒（BET）表面积为48.5 m²/g。在间歇和动态条件下评估了珠粒的吸附容量。当溶液中锶的平衡浓度在pH 6.5时为925 mg/L，在298 K下，吸附容量约为29 mg/g吸附剂。X射线光电子能谱（XPS）数据表明，珠粒对锶的吸收主要通过离子交换过程发生。动力学数据表明，锶在珠粒上的吸附遵循反常扩散。热力学数据表明，珠粒表面上Sr的离子交换在本质上是可行的、自发的且吸热的。
