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| 不同種類和不同電子組態(tài)的金屬離子與陶瓷膜的ZrO2納米晶涂層表面親水性的羥基生成表面絡(luò)合物后,勢必改變原陶瓷膜的表面狀態(tài)及表面性能,使得膜與過濾介質(zhì)的接觸界面及附近的離子分布受到影響,從而對其滲透通量產(chǎn)生影響。圖4為壓差為0.1MPa下、pH值為7、不同濃度的NaCl和MgCl2在室溫(298K)時對滲透通量的影響。由于Mg2+在膜表面發(fā)生了特征吸附,隨著MgCl2濃度的增大,滲透通量呈明顯下降的趨勢。而 Na+在膜表面沒有發(fā)生特征吸附,隨著NaCl濃度的增大,滲透通量呈稍有增加的趨勢。在電解質(zhì)溶液中,水分子除了處在大小不同的團(tuán)簇結(jié)構(gòu)的動態(tài)平衡外,還有一部分水分子以離子為中心呈放射狀結(jié)構(gòu)。在陶瓷膜的幾何(結(jié)構(gòu))狀態(tài)確定后,膜的表面態(tài)(結(jié)構(gòu))與不同結(jié)構(gòu)的水分子的相互作用是決定滲透通量的主要內(nèi)在因素。 |
» 搶金幣啦!回帖就可以得到:
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不容易啊,終于完成了。樓主斟酌! The formation of complex compound, resulting from reaction of metal ions of various types and electronic configurations with hydrophilic hydroxyl on the surface of nanocrystalline ZrO2 coating on the ceramic membrane, is bound to change the surface conditions and performance of the original ceramic membrane, affecting ion distribution at and near the interface between the membrane and filter medium, which would has a further impact on the permeation flux. The influence of concentration of NaCl and MgCl2 on permeation flux under the conditions of a pressure difference of 0.1MPa, pH 7 and a room temperature of 298K, is shown in Fig.4. Permeation flux shows a remarkable decreasing trend when MgCl2 concentration increases, because of the characteristic adsorption of Mg2+ on the membrane surface. On the contrary, the increase in NaCl concentration leads to a slight increase in permeation flux, since characteristic adsorption of NaCl does not happen on the membrane surface. In electrolyte solutions some water molecules are at dynamic balance with clusters of different sizes, others are present in the form of radial symmetry with ion in the center. When the geometrical/structural conditions are given, the interaction between membrane surface state/structure and water molecules with different structures is the primary internal factor which determines permeation flux. |
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看我的專業(yè)就知道我的翻譯還是不夠“專業(yè)”啊,你不急的話,把要翻譯的段落發(fā)到我郵箱qiuqingjunzz@126.com吧,我看看再說,年關(guān)了,都忙啊 |
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