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Adsorption/Desorption Performance of Dyes Using Ion Exchange Membranes
ion exchange membrane
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|摘要:||本研究針對使用離子交換薄膜吸附移除染料廢水中染料之結果加以探討。本論文使用兩種陰離子染料(Cibacron blue 3GA和Cibacron blue 3BA)與一種陽離子染料(Methyl violet 2B)，以及四種商業離子交換薄膜(SB6407、I.C.E. 450 supported、DE81、P81)進行實驗。在兩個小時的批次吸附結果，Cibacron blue 3GA的最大吸附量分別為31.5 mg/cm3 (SB6407)與25.5 mg/cm3 (DE81), Cibacron red 3BA為24.5 mg/cm3 (SB6407)與18.6 mg/cm3(DE81), Methyl violet 2B 為4.4 mg/cm3 (I.C.E. 450 supported)與3.8mg/cm3 (P81). Cibacron blue 3GA的最佳脫附條件為1N KSCN 60% methanol (SB6407)與1N HCl 60% methanol (DE81). Cibacron red 3BA的最佳脫附條件為1N HCl 60% methanol (SB6407, DE81). 而Methyl violet 2B的最佳脫附條件為1N NaCl 40% methanol (I.C.E. 450 supported, P81). 流動實驗中分別使用流速1和8 mL/min, 由實驗結果可看出所有薄膜均能有效的重覆吸附/脫附三次，並且有很好的吸附(約80~100%)與脫附(約70~100%)效果。|
In this study, ion exchange membrane, one of the adsorptive membrane techniques, was chosen for dye removal from water and the related performance was intensively evaluated. First, two anionic reactive dyes, Cibacron blue 3GA and Cibacron red 3BA, and two commercial anion exchange membranes, SB6407 and DE81, were employed. In two-hour batch process, the adsorption isotherm results showed that the maximum adsorption capacities for Cibacron blue 3GA were 31.5 mg/cm3 SB6407 and 25.5 mg/cm3 DE81, and for Cibacron red 3BA were 24.5 mg/cm3 SB6407 and 18.6 mg/cm3 DE81. Different desorption solutions were tested in two-hour batch desorption process. The highest desorption percentage (about 70%) occurred in the use of 1N KSCN in 60% methanol for Cibacron blue 3GA on SB6407 membrane and 1N HCl in 60% methanol for Cibacron blue 3GA on DE81 membrane. The Cibacron red 3BA occurred in the use of 1N HCl in 60% methanol on SB6407 membrane and 1N NaOH in 20% methanol on DE81 membrane. Using these optimal desorption conditions, the flow adsorption/desorption experiments were conducted at different flow rates. The results showed that, for 1 mL/min, the SB6407 membrane performance was almost identical to its batch performance while the DE81 performance was a little bit worse. For 8 mL/min process, both adsorption and desorption percentages reduced to about 70-90% of those for 1 mL/min in most cases. For cation exchange membranes, the maximum adsorption capacities were 4.4 mg/cm3 for I.C.E. 450 supported and 3.8 mg/cm3 for P81. For both membranes, the highest desorption percentage (about 80%) occurred in the use of 1 N NaCl or KCl in 40% methanol. Using this optimal desorption condition, the flow adsorption/desorption experiments were conducted at different flow rates. The flow rate effect was insignificant for the I.C.E. 450 supported membrane, whereas the adsorption percentage for 8 mL/min using the P81 membrane was decreased to about 80% of that for 1 mL/min. Although the desorption percentage was not 100%, the flow process of dye removal for all the ion exchange membranes adsopted in this study could be successfully repeated three times in serial without any deterioration in the performance.
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