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hellen7256

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The results revealed that the flux of the NaCl solutions and pure water through the geopolymer circular plate membrane is nearly zero, whereas the flux of the NaCl solutions through the self-supporting zeolite membrane can be greater than 4.74 kg m-2 h-1 (25ºC) when the membrane thickness was decreased to 2 mm (see Fig. 6). In this membrane, the majority of the geopolymer gel was converted into the zeolite phase after the hydrothermal process (see Fig. 2 and Fig. 3), whereas a small quantity of non-converted material inside the membrane continued to provide strength and buttressing support for the zeolite membrane. The flux through the suddenly changed geopolymer primarily resulted from the transformation of the micropores in the geopolymer gel. The volume of the micropores changed from 0 to 0.049 cc/g after the hydrothermal process.
The pervaporation temperature was maintained at approximately 25ºC, and the feed pressure was less than 0.1 MPa depending on the pervaporation temperature. During the pervaporation process for the desalination of seawater, the disc-shaped NaA zeolite membrane (diameter = 40 mm, thickness = 2-10 mm) was sealed in a membrane module. The feed was usually placed on the zeolite side of the support to minimize the concentration polarization. The concentration of Na ions in the collected permeated solutions was analyzed using ICP to obtain the ion % rejection value.

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1樓 2015-06-16 23:03:52

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hellen7256: 金幣+35, 翻譯EPI+1, ★★★★★最佳答案 2015-06-17 21:45:55

結(jié)果表明通過地質(zhì)聚合物圓盤膜NaCl溶液和純水的流量幾乎為零，而在自身支持沸石分子篩膜厚度減小到2毫米時(shí)通過它的NaCl溶液流量可高于4.74kg/平方米/小時(shí)（25攝氏度）（見圖6）。在這種膜內(nèi)，大多數(shù)地質(zhì)聚合物凝膠經(jīng)水溫作用轉(zhuǎn)變?yōu)榉惺肿雍Y相（見圖2和圖3），而膜中少量未轉(zhuǎn)變的材料繼續(xù)為沸石分子篩提供強(qiáng)度和扶墻支持。這種通過突然改變的地質(zhì)聚合物的流量主要是由于地質(zhì)聚合物凝膠中微孔的變化。在水溫作用下微孔的體積從0變到0.049cc/g.
全蒸發(fā)溫度保持在大約25攝氏度，填料壓力取決于全蒸發(fā)溫度，低于0.1MPa。在全蒸發(fā)海水脫鹽過程中，盤狀的NaA沸石分子篩膜（直徑=40mm,厚度=2-10mm）封閉在膜模具中。填料通常加在支持最小濃差極化的沸石分子篩一側(cè)。在收集的透過溶液中鈉離子的濃度用感應(yīng)耦合等離子體法測定，得到離子排除值百分比。

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2樓2015-06-17 02:19:46

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