Structure and Property of Porous Polyvinylalcohol Hydrogels for Microorganism Immobilization |
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Authors: | Xianyu?Li Anyang?Hu Email author" target="_blank">Lin?YeEmail author |
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Institution: | (1) State Key Lab. of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China;(2) Sichuan Vinylon Factory, Sinopec, Chongqin, 401254, China; |
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Abstract: | 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. |
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