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壳聚糖基多孔膜的制备方法进展 总被引:3,自引:0,他引:3
对壳聚糖基多孔膜制备的主要技术,相转化法、冷冻诱导相分离法、模板浸取法、聚合物辅助倒相法进行了评价,并着重探讨了在聚合物辅助倒相过程中,聚合物共混对的选择对多孔膜结构的影响。 相似文献
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Volatile organic compounds (VOCs) are considered as a major pollutant in indoor and outdoor air.More stringent environmental regulations have been implemented in order to reduce the VOC emissions.One of the techniques available for destructive removal of VOCs is catalytic oxidation.In the present work,Al/Rare Earths (REE: Y,Ce,La,Pr and Nd) pillared clays (PILCs) were used to support 0.2 wt.% of palladium for the complete oxidation of low concentration of benzene.The supports and catalysts were characterized by XRD,N2 adsorp-tion/desorption,FTIR spectroscopy,HRTEM and H2-TPR techniques.The results indicated that after Al and Al/REE pillaring,the basal spac-ing,SBET,Amic and Vmic of Al and AlREE-PILC had a considerable increase compared with those of Na-mmt.Activity tests of deep oxidation of benzene showed that the catalytic activity of Pd catalysts supported on Al and AlREE-PILC were much higher than that on initial clays,which was due to the fact that optimized structure of PILCs,such as large basal spacing,high SBET and porosity,improved Pd dispersion and increased the active sites of Pd.Especially for Pd/AlCe-PILC,the temperature of complete oxidation was about 280 oC,exhibiting the highest catalytic activity. 相似文献
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Volatile organic compounds (VOCs) are considered as a major pollutant in indoor and outdoor air.More stringent environmental regulations have been implemented in order to reduce the VOC emissions.One of the techniques available for destructive removal of VOCs is catalytic oxidation.In the present work,Al/Rare Earths (REE: Y,Ce,La,Pr and Nd) pillared clays (PILCs) were used to support 0.2 wt.% of palladium for the complete oxidation of low concentration of benzene.The supports and catalysts were characterize... 相似文献
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采用气流磨粉碎的方法制备了平均粒径在微米尺寸的三角蚌贝壳粉,将此贝壳粉与环氧树脂进行熔融共混得到一系列不同配比的复合材料.贝壳粉的有机质有助于提高两相间的相互作用,适量微米级贝壳粉的引入,在环氧基体和粒子相之间形成了一定数量的界面层,两相间有较强的界面亲和力,体系的自由体积尺寸与强度略有下降,中间寿命分量强度升高,这种较好的界面效应使得复合材料在受到外力作用时,断裂能和应力能够很好地通过界面传递到贝壳粒子上,从而使复合材料的性能提高. 相似文献