Adsorption-desorption behavior of dioxins in waste water using temperature-sensitive polymer gel

利用由聚乙烯醇(PVA)合成的温敏性聚合物凝胶的吸附和解吸特性，实现了对水中有害有机物的去除。实验中使用了两种聚合度(1700和2500)的PVA。在水中，1700和2500的凝胶体积分别在310K和320K附近形成。在较高温度下，温度敏感型聚合物凝胶因出水而收缩，而在较低温度下，凝胶因吸水而膨胀。温度变化证实了合成的聚合物凝胶的体积变化可逆性。研究了不同温度下有机化合物在PVA聚合物凝胶上的吸附行为。当吸附温度高于310K(1700)和320K(2500)时，有机物的吸附量显著增加。证实了水中的有机物在PVA聚合物凝胶上可逆温度吸附和解吸。有机化合物在凝胶上的吸附和解吸机理可以用聚合物凝胶的水化和脱水来解释。吸附的驱动力被认为是PVA聚合物凝胶与有机物之间的疏水相互作用。

Removal of harmful organic materials in water has been carried out using adsorption and desorption characteristics of the temperature sensitive polymer gel which is synthesized from polyvinylalcohol(PVA). Two types of polymerization degrees (1700 and 2500) of PVA were used in this experiment. The gel volume in water was induced at around 310K for 1700 and 320K for 2500. At higher temperatures, the temperature sensitive polymer gels shrink because of discharging water, whereas at lower temperature, the gel on the contrary swells because of absorbing water. The reversibility on volume change of the synthesized polymer gel is confirmed by temperature swing.The adsorption behavior of organic compounds onto the PVA polymer gels in water was investigated at the various temperatures. The adsorption amount of organic compounds increase remarkably at higher than about 310K for 1700 and 320K for 2500. It was confirmed that the organic compound in water could be adsorbed and desorbed onto the PVA polymer gel against temperature reversibly. The mechanism of adsorption and desorption of organic compounds onto the gel can be explained by hydration and dehydration of the polymer gel. The driving force of adsorption is thought to be the hydrophobic interaction between PVA polymer gel and organic compounds.