When synthesizing copper compounds containing polymeric adsorbents, it was found that the two copper oxides, Cu₂O and CuO, deposited in the skeleton of a strongly basic macroreticular anion exchanger (An) radically diminished the porosity of the obtained composites in relation to the host material. In order to investigate this phenomenon more closely, An/Cu₂O and An/CuO (both based on the commercial anion exchanger Amberlite IRA900Cl), containing 8.6 and 8.2 wt% Cu, respectively, were subjected to scrutiny. The porous characteristics of the thermally dried and freeze-dried samples were determined using the N₂ adsorption–desorption method and mercury intrusion porosimetry. The thermally dried samples lost their porosity and increased their bulk density in relation to the pure resin indicated a significant reduction in their volume. It was found that during drying, the grains shrank as much as the pores collapsed. The decay of the porous structure resulted from the surface morphology of the Cu₂O and CuO particles and their tendency to agglomerate. Both freeze-dried samples retained the porous characteristics typical for macroporous anion exchangers. In contrast to the most popular hybrid ion exchangers containing hydrated polyvalent metal oxides (such FeOOH), An/Cu₂O and An/CuO showed markedly strong volume contraction effect in relation to moisture content.

Graphical abstract

中文翻译：

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Cu2O和CuO沉积物对大网状阴离子交换剂孔隙率的异常影响

在合成含有聚合物吸附剂的铜化合物时，发现沉积在强碱性大网络阴离子交换剂 (An) 的骨架中的两种氧化铜 Cu ₂ O 和 CuO 从根本上降低了所获得复合材料相对于主体的孔隙率材料。为了更仔细地研究这种现象，对分别含有 8.6 和 8.2 wt% Cu 的An/Cu ₂ O 和 An/CuO（均基于商业阴离子交换剂 Amberlite IRA900Cl）进行了仔细检查。使用 N ₂测定热干燥和冷冻干燥样品的多孔特性吸附-解吸法和压汞法。与纯树脂相比，热干燥的样品失去了它们的孔隙率并增加了它们的堆积密度，这表明它们的体积显着减少。发现在干燥过程中，颗粒收缩的程度与孔隙塌陷的程度相同。多孔结构的衰减是由 Cu ₂ O 和 CuO 颗粒的表面形态及其附聚趋势造成的。两种冻干样品都保留了大孔阴离子交换剂的典型多孔特性。与最流行的含有水合多价金属氧化物（如 FeOOH）的混合离子交换剂相比，An/Cu ₂ O 和 An/CuO 显示出与水分含量相关的明显强烈的体积收缩效应。

图形概要