State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, PR China.
J Hazard Mater. 2011 Dec 30;198:241-6. doi: 10.1016/j.jhazmat.2011.10.036. Epub 2011 Oct 15.
Hydrous ferric oxide (HFO) loaded hybrid sorbents are considered to be excellent materials for arsenic removal from water. However, role of the host pore structure in the performance of the composites is still unclear. In the current study five HFO nanocomposites of similar HFO loadings (3.9-5.3% in Fe mass) were fabricated for arsenite removal, using self-synthesized polystyrene (PS) resins of similar particle sizes but different pore structures as hosts. Structure analysis demonstrated that the particle size of HFO aggregates decreased with decreasing pore size of PS. The adsorption of arsenite onto the nanocomposites with PS of smaller average pore size achieved equilibrium faster. Analysis of kinetic data with the intraparticle diffusion model demonstrated that arsenite adsorption onto PS-HFO nanocomposites with larger HFO particles was controlled by intraparticle diffusion whereas the limitation caused by intraparticle diffusion was weakened as the particle size of HFO decreased. The adsorption capacity of the hybrid adsorbents increased with decreased pore size of PS. These results indicated that the pore structure of the support materials would play a significant role in the performance of nanoparticle-loaded porous adsorbents.
水合氧化铁（HFO）负载的杂化吸附剂被认为是从水中去除砷的优异材料。然而，宿主孔结构在复合材料性能中的作用仍不清楚。在本研究中，使用自合成的具有相似粒径但不同孔结构的聚苯乙烯（PS）树脂作为载体，制备了负载量相似（Fe 质量分数为 3.9-5.3%）的五组 HFO 纳米复合材料，用于去除亚砷酸盐。结构分析表明，随着 PS 孔径的减小，HFO 聚集体的粒径减小。具有较小平均孔径的 PS 的亚砷酸盐吸附到纳米复合材料上更快达到平衡。用颗粒内扩散模型分析动力学数据表明，具有较大 HFO 颗粒的 PS-HFO 纳米复合材料上的亚砷酸盐吸附受颗粒内扩散控制，而当 HFO 粒径减小时，颗粒内扩散引起的限制作用减弱。杂化吸附剂的吸附容量随 PS 孔径的减小而增加。这些结果表明，载体材料的孔结构在负载纳米颗粒的多孔吸附剂的性能中起着重要作用。
