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alibabashiqun铁杆木虫 (知名作家)
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翻译摘要。。
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希望能够有虫友帮我翻译下摘要。特奉献158个BB，说话算话！！！如下文： 微滤复合陶瓷膜在液体分离、生物化工、环保等领域有着广泛的应用前景。但价格昂贵、分离效率低的状况仍是当今膜科学研究的一个重要课题。利用金属氧化物对微滤陶瓷复合膜进行修饰改性不仅可以改善它的物化性能，而且还可以显著提高无机膜分离效率，因此，进行微滤陶瓷复合膜的改性及其调控方法研究，将为微滤陶瓷膜的应用建立坚实的技术平台。 本论文以Zn(OAc)2为前驱体，乙二醇甲醚为溶剂，一乙醇胺为稳定剂，首次采用溶胶-凝胶法制备ZnO改性溶胶，以Al2O3微滤膜(孔径φ=0.89μm)作为基体进行其孔道内壁修饰改性，对影响ZnO改性溶胶的反应温度、反应物浓度、溶胶陈化时间等工艺因素进行了详细探讨，测试了Al2O3微滤膜改性前后的孔径和水通量变化，运用TEM、SEM、Zeta电位等对改性后的微滤膜进行检测分析。研究结果表明：在水浴温度为65℃，改性溶胶中Zn2+改性溶胶浓度为0.2mol/I，pH为3，溶胶陈化时间为72小时，经600℃焙烧改性样品，可在微滤膜孔道内壁获得一层晶粒为5～15nm、厚度为15nm左右的纳米ZnO改性涂层。在微滤膜孔径减小的情况下，改性后的微滤膜水通量有显著的提高，最大提高幅度为159.6%。 为对ZnO改性涂层进行性能调控，本文在溶胶-凝胶法制备ZnO改性溶胶最佳工艺条件基础上，进行了Ag离子掺杂研究。通过掺杂不同摩尔质量分数Ag离子，测试Ag离子掺杂ZnO改性的孔径和水通量变化，以及Ag离子掺杂ZnO改性涂层的Zeta电位大小，着重探讨了掺杂改性涂层Zeta电位与微滤膜过滤通量的关系。当过滤介质蒸馏水的pH=7时，以0.2mol(wt%)Ag掺杂的ZnO颗粒的Zeta电位最高且水通量提高幅度最大。实验结果发现：由Ag离子掺杂ZnO纳米晶粒所构成的改性涂层同样具有提高微滤陶瓷膜水通量的功能，比未改性的水通量提高幅度最大为187.96%，效果比单独用ZnO改性明显。 最好今天下午前翻译完，请不要用谷歌或者其他在线翻译！！谢谢。。 |
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jingjing1005
木虫 (小有名气)
- 翻译EPI: 27
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- 虫号: 1022144
- 注册: 2010-05-19
- 专业: 质谱分析
★ ★
wypward(金币+2):鼓励下，辛苦啦！ 2010-05-27 18:39:31
alibabashiqun(金币+100, 翻译EPI+1):辛苦了，我也给楼下哥们几个哈。。别嫌少。。非常感激 2010-05-28 08:35:03
wypward(金币+2):鼓励下，辛苦啦！ 2010-05-27 18:39:31
alibabashiqun(金币+100, 翻译EPI+1):辛苦了，我也给楼下哥们几个哈。。别嫌少。。非常感激 2010-05-28 08:35:03
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Composite ceramic membranes for microfiltration are wildly used in liquid separation, biological chemicals, environmental protection and other fields with a broad application prospects. However, it is still an important topic of membranes research that the composite ceramic membranes are of high price but of low separation efficiency. The modification of them by metal oxide can not only improve their physical and chemical properties, but also significantly enhance the separation efficiency of inorganic membrane. Therefore, the research on the modification of composite ceramic membranes for microfiltration will establish a solid technology platform for their applications. In this thesis, the sol-gel method to prepare modified ZnO sol was first used with Zn (OAc) 2 as precursor, ethylene glycol monomethyl ether as solvent, and ethanolamine as the stabilizer. Its inner wall modification was done with Al2O3 microfiltration membrane (pore size φ = 0.89 μm) as substrate. The craft factors such as reaction temperature, reaction concentration and sol aging time influencing the ZnO modified sol were fully discussed in detail. Also the changes of pore size and water flux before and after the modification of Al2O3 micro-membrane were detected and analyzed using TEM, SEM, Zeta potential, etc. The results show that: in the water bath of 65 ℃, the concentration of Zn2 +modified sol was 0.2mol / I, pH was 3, sol aging time was 72 hours. The samples calcined at 600 ℃ can form a modified nano-ZnO layer of grain 5 ~ 15nm, with the thickness of about 15nm. In the case of the reduction of membrane pore size, the water flux of modified micro-membrane increased significantly, reaching the largest value of 159.6%. For the regulation on the performance of modified ZnO layer, the Ag ions doping research was done in this paper on the basis of the studies on the optimal conditions for sol-gel method to prepare ZnO modified sol. Through doping with Ag ions of different molar mass, the changes of pore size, water flux and Zeta potential caused by Ag ions were tested. This paper mainly focuses on the relationship between the flux microfiltration and Zeta potential. At the PH of distilled water as filter medium of 7, the highest Zeta potential and the largest water flux of ZnO particles were achieved at 0.2mol (wt%) Ag-doped. It was found that the modified layer constituted of Ag doped ZnO nanocrystals also has the functions of improving membrane water flux, 187.96%more than the unmodified one at most, better than modified with ZnO alone. |
2楼2010-05-27 11:17:01
noleg
金虫 (小有名气)
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★ ★ ★
wypward(金币+3):欢饮新虫，谢谢参与，以后多来哦！ 2010-05-27 18:39:05
alibabashiqun(金币+58):非常感激，也给你几个BB别嫌少啊。。呵呵。。 2010-05-28 08:35:38
wypward(金币+3):欢饮新虫，谢谢参与，以后多来哦！ 2010-05-27 18:39:05
alibabashiqun(金币+58):非常感激，也给你几个BB别嫌少啊。。呵呵。。 2010-05-28 08:35:38
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Composite ceramic membrane for microfiltration has a prosperous future of application in fields of liquid separation, biological chemicals, environmental protection, etc. And it is still an important topic of membrane research because of its high price and low separation efficiency. Modified by metal oxide, their physical and chemical properties proved to be improved, meanwhile, the separation efficiency of inorganic membrane were also enhanced significantly. Therefore, the research on the modification and regulation of composite ceramic membrane for microfiltration will provide a solid technological platform for their applications. In this thesis, the sol-gel method to prepare modified ZnO sol was first used with Zn(OAc)2 as precursor, ethylene glycol monomethyl ether as solvent, and ethanolamine as the stabilizer. Its inner wall modification was done with Al2O3 microfiltration membrane (pore size φ = 0.89 μm) as substrate. The pocess factors influencing the modification of ZnO sol, such as reaction temperature, reaction concentration and sol aging time, were fully discussed in detail. Also, the changes of pore size and water flux before and after the modification of Al2O3 micro-membrane were detected and analyzed using TEM, SEM, Zeta potential, etc. The results show that: in a water bath of 65 ℃, the concentration of Zn2+modified sol was 0.2mol / I, pH was 3, sol aging time was 72 hours. The modified sample calcined at 600 ℃ could form a thin layer of nano-ZnO grain, with size of 5 to 15nm and thickness of about 15nm. When membrane pore size was decreased, the water flux of modified micro-membrane increased significantly, reaching the largest value of 159.6%. To regulate the performance of modified ZnO layer, the Ag ions doping was done on the basis of the studies on the optimal conditions for sol-gel method to prepare ZnO modified sol. The changes of pore size, water flux and Zeta potential caused by Ag ions of different molar ratio were tested. This paper mainly focused on the relationship between the flux microfiltration and Zeta potential. When the PH value of distilled water, as filtration medium, was 7, and the doping ratio of Ag was 0.2mol (wt%), the highest Zeta potential and the largest water flux of ZnO particles were achieved. It was found that the modified layer constituted of Ag doped ZnO nanocrystals also has the function of improving membrane water flux, 187.96%( max.) more than the unmodified one, better than that modified with ZnO alone. 平心而论，二楼也不错，但不少地方不是很妥。 欢迎切磋、指正！ |
3楼2010-05-27 15:21:15
