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Abstract：
Two different silica conformations (xerogels and nanoparticles), both formed by the mediation of dendritic poly (ethylene imine), were tested at low pHs for problematic uranyl cation sorption. The effect of crucial factors, i.e., temperature, electrostatic forces, adsorbent composition, accessibility of the pollutant to the dendritic cavities, and MW of the organic matrix, was investigated to determine the optimum formulation for water purification under these conditions. This was attained with the aid of UV-visible and FTIR spectroscopy, dynamic light scattering (DLS), ζ-potential, liquid nitrogen (LN2) porosimetry, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Results highlighted that both adsorbents have extraordinary sorption capacities. Xerogels are cost-effective since they approximate the performance of nanoparticles with much less organic content. Both adsorbents could be used in the form of dispersions. The xerogels, though, are more practicable materials since they may penetrate the pores of a metal or ceramic solid substrate in the form of a precursor gel-forming solution, producing composite purification devices.
摘要：
两种不同的二氧化硅构象（干凝胶和纳米颗粒），两者都是由树枝状聚(乙烯亚胺)介导形成的，在低pH下测试了有问题的铀酰阳离子吸附。关键因素的影响，即，温度,静电力，吸附剂组合物,污染物对树枝状腔的可及性，和有机基质的MW，进行了研究，以确定在这些条件下水净化的最佳配方。这是借助紫外可见光谱和FTIR光谱实现的，动态光散射(DLS),ζ-电位,液氮（LN2）孔隙率法，热重分析（TGA），和扫描电子显微镜（SEM）。结果强调两种吸附剂都具有非凡的吸附能力。干凝胶具有成本效益，因为它们的性能接近有机含量少得多的纳米颗粒。两种吸附剂都可以以分散体的形式使用。干凝胶，虽然,是更实用的材料，因为它们可以前体凝胶形成溶液的形式穿透金属或陶瓷固体基底的孔，生产复合净化装置。
