共查询到17条相似文献,搜索用时 156 毫秒
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通过过滤(0.7μm)和切向超滤(100kDa、10kDa、1kDa)技术将实验室内培养的赤潮异弯藻和中肋骨条藻藻液分离成100kDa-0.7μm、10~100kDa、1~10kDa的胶体浓缩液和<1kDa的超滤液,利用激发-发射矩阵荧光光谱技术测定了不同粒级溶液中有机物的荧光性质,分析了三维荧光光谱图中的荧光峰位置、数量及荧光强度的变化情况.结果表明,两种微藻产生的类腐殖质荧光物质主要是<1kDa的小分子物质.赤潮异湾藻产生的类蛋白荧光物质中,15%是100kDa-0.7μm的大胶体,8%是10~100kDa的中胶体,而大部分是<1kDa的小分子物质.赤潮异弯藻各级超滤截留液的类蛋白荧光峰的发射波长与过滤液相比,发生蓝移,而超滤液的则发生红移,表明赤潮异湾藻产生的类蛋白荧光物质随着粒径的增大极性减弱. 相似文献
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压力驱动膜技术在废水资源化方面的应用 总被引:1,自引:0,他引:1
压力驱动膜技术(反渗透、纳滤、超滤、微滤)作为一种高效、节能、环保的分离技术,在废水资源化方面体现出较大的潜力.废水资源化指从生产流程中排放的废水中回收有价值物质,如废水中残留的产品,或可以进一步利用的副产物,或可以回用的中间产物等,以达到充分利用资源,降低污染,获取经济、社会和环境效益的目的.文章介绍了压力驱动膜的市场现状,并对压力驱动膜分离技术实现牛奶/大豆乳清、制糖压榨水/再生水、造纸蒸煮废液、印染废水、抗生素废水和农药废水等废水资源化过程进行了综述. 相似文献
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膜色谱技术在生物大分子分离与纯化中的应用 总被引:4,自引:0,他引:4
膜色谱是将液相色谱与膜分离融合于一起的新型生化分离技术,具有选择性高、分离速度快、能耗低、易放大等特点,在生物大分子的分离与纯化方面有广阔的应用前景。本文论述了膜色谱的种类、制备方法及作用机理,并介绍了亲和、疏水、离子交换、多级等四种膜色谱在近五年来的应用进展。 相似文献
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均相离子交换膜在我国若干工业领域的应用 总被引:1,自引:0,他引:1
介绍了我国己批量生产的均相阴、阳离子交换膜的制造方法及其电化学性能指标,并且详细阐述了这些膜在填充床电渗析制造高纯水、造纸黑液的处理、甘氨酸的分离和纯化对及d-酒石酸钠生产d-酒石酸等若干工业领域的应用所取得的成果.我国已能生产用于上述领域的成套均相阴、阳膜组装的电渗析设备. 相似文献
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压力驱动膜分离过程的操作模式及其优化 总被引:5,自引:1,他引:4
压力驱动膜过程主要包括微滤、超滤、纳滤和反渗透4种,操作时可采用浓缩和渗滤两种模式.典型操作过程由预浓缩、恒容渗滤和后浓缩3个阶段组成,对其进行优化,以使总过程时间最短和渗滤操作时渗滤溶剂的消耗量最小. 相似文献
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Yamashita AC Tomisawa N 《Hemodialysis international. International Symposium on Home Hemodialysis》2010,14(Z1):S7-13
Selecting dialyzers is more important for blood purification in critical care because other therapeutic options (especially amount of dialysate) are usually limited. Adsorption is a major mechanism of removing toxic substances from patients in these treatments. Several commercial dialyzers designed for acute blood purification therapy were investigated by performing aqueous ultrafiltration experiments to demonstrate the adsorptive importance of membrane materials. Polymethylmethacrylate showed strong adsorptive characteristics to α-chymotripsinogen A (MW 25,000) but showed much less adsorptive characteristics to cytochrome C (MW 12,400). On the contrary, polyacrylonitrile showed relatively lower affinity and polysulfone showed essentially no affinity to these proteins. Time-dependent and concentration-dependent characteristics of clearance for these solutes were also demonstrated in polymethylmethacrylate. Adsorption found in polymethylmethacrylate may be due to the occlusion of protein molecules into pores of the membrane. Choosing membrane materials is, therefore, important not only in removing inflammatory cytokines but also for accounting for the loss of albumin in acute and chronic treatments. 相似文献
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A. Nagendran D. Lawrence Arockiasamy D. Mohan 《Materials and Manufacturing Processes》2008,23(3):311-319
Ultrafiltration (UF) techniques have particular advantages for simultaneous purification, concentration, and fractionation of macromolecules. In this study, polymeric blend ultrafiltration membranes based on cellulose acetate and polyetherimide were prepared by phase inversion technique and characterized in terms of compaction time, pure water flux (PWF), water content, membrane hydraulic resistance, and scanning electron microscopy (SEM). The blend membranes prepared were subjected to the separation of macromolecular proteins such as bovine serum albumin (BSA), egg albumin (EA), pepsin, and trypsin. The molecular weight cut-off (MWCO) of blend membranes obtained from the protein separation studies is also presented. Toxic heavy metal ions such as copper, nickel, zinc, and cadmium were subjected to separation by the blend membranes by complexing them with the polymeric ligand polyethyleneimine. The separation and permeate flux efficiencies of the blend membranes are compared with those of pure cellulose acetate membranes. 相似文献