| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 96 === The study has two important results: first, in the optimization condition, Chitosan/PVA membrane can adsorb residual chlorine efficiently. Second, the relative voltage method is a convenient and good method and can detect when the Chitosan/PVA adsorption is saturated.
The relative voltage detector is home-made by me. I admixe the waste crab shell and PVA to make the Chitosan/PVA membrane. Then I use the detector to detect its adsorption effect constantly and immediately. This detector guarantees the water security, easy operation, automatic record and immediate and efficient analysis of the results. Besides its additive recovery ratio is between 85%~110%, which proves this method of examination is accurate.
The swelling ratio of Chitosan/PVA membrane is as 41 times as that of the granulated Chitosan before the modification. I think to add PVA will reduce the porosity, but it can make looser the molecular structure of the surface of the membrane. Because the structure is looser, it has better hydroscopicity and elevates the adsorption effect and capacity. Simultaneously if the solution advances acidification, in Chitosan/PVA membrane amino group can protonate and becomes ammonium ion (-NH3+), and can adsorb more residual chlorine in the water. When the concentration is 10mg/L, the flow rate is 1.36ml/min and the temperature is 30℃, Chitosan/PVA membrane has the best adsorption. In addition, combining two adsorption tanks can double the adsorption capacity. Under the same optimization condition mentioned above, it also has good effect to treat the tap-water with Chitosan/PVA membrane.
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