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首页> 外文期刊>Journal of Polymers and the Environment >Structure and Property of Porous Polyvinylalcohol Hydrogels for Microorganism Immobilization
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Structure and Property of Porous Polyvinylalcohol Hydrogels for Microorganism Immobilization

机译：多孔聚乙烯醇水凝胶固定微生物的结构和性能

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摘要

The porous polyvinylalcohol (PVA) hydrogel was prepared by chemical crosslinking in the saturated boric acid solution with sodium bicarbonate (SBC) as porogen. It was found that addition of SBC decreased the mechanical strength of the gel beads, while the gel permeability was improved. The equilibrium swelling rate and the swelling rate constant k of gel beads increased significantly by addition of SBC. Most of water in PVA hydrogel was in the form of free water and freezing bound water. With increasing SBC content, the total water content of the gel increased, in which the free water content increased remarkably, due to the formation of a large number of pores, and in the meantime, n values, characterizing the mole content of non-freezing bound water, were also improved greatly, indicating of the enhancement of the interaction between PVA molecules and water molecules. SEM observation showed that by adding SBC, many pores formed on the surface and inside gels, which provided channels for microbial metabolites. Microorganism could be successfully entrapped in the porous PVA beads, and addition of SBC made COD removal rate of the gel beads increase significantly.
机译：多孔聚乙烯醇（PVA）水凝胶是通过在饱和硼酸溶液中以碳酸氢钠（SBC）作为致孔剂进行化学交联制备的。发现添加SBC降低了凝胶珠的机械强度，同时提高了凝胶渗透性。通过添加SBC，凝胶珠的平衡溶胀速率和溶胀速率常数k显着增加。 PVA水凝胶中的大多数水都是游离水和冻结结合水的形式。随着SBC含量的增加，凝胶的总含水量增加，其中由于形成大量孔而游离水含量显着增加，同时n值表示非冻结的摩尔含量结合水也大大改善，表明PVA分子和水分子之间的相互作用得到增强。 SEM观察表明，通过添加SBC，在凝胶的表面和内部形成许多孔，这为微生物代谢物提供了通道。微生物可以成功地捕获在多孔的PVA珠中，而SBC的添加使凝胶珠的COD去除率大大提高。

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