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磁性介孔氧化硅材料的制备与应用 总被引:1,自引:0,他引:1
介绍了新型复合材料——磁性介孔氧化硅材料的制备途径和应用领域。磁性介孔氧化硅材料兼具介孔氧化硅材料和磁性纳米粒子两者的优势。该材料比较常见的制备方法包括两大类:一步法和两步法,对这两大类制备方法进行了介绍,并从介孔结构和磁性分离性能两方面对不同制备方法进行了比较。相比而言,两步法普遍存在步骤较多、耗时较长或磁性颗粒严重阻塞孔道等问题;一步法则更为简单省时,同时磁性颗粒在二氧化硅壁面内原位形成,一定程度上避免了介孔孔道的堵塞。磁性介孔氧化硅材料在药物控释、生物催化等领域展现出了良好的应用前景。 相似文献
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In this paper,the effects of pore-size of SBA-15 on the adsorption kinetics and equilibrium of large protein molecules Bovine serum albumin(BSA)and lysozyme(LYS)have been investigated.The mesoporous molecular sieve SBA-15 with six different pore sizes were synthesized with P123 triblock copolymer as the template agent,and 1,3,5-trimethylbenzene(TMB)and isopropyl alcohol as the pore-expanding agent.The samples were characterized by N2 adsorption/desorption,Scanning Electron Microscopy(SEM),Transmission Electron Microscopy(TEM)and X-Ray Diffraction(XRD).It is found that BSA and LYS were adsorbed rapidly on SBA-15 materials with large pores.The BSA adsorption capacity of sieve with the pore diameter of 21.4 nm reached 500 mg·g-1 within 25 minutes.However,if the pore diameter was smaller than 14 nm,the BSA adsorption capacity of the sieve was only about 220 mg·g-1.The adsorption equilibrium data fits in the Langmuir model,where the coefficient of effective use of specific area of mesoporous molecular sieve was found to be 0.03,0.18,0.37 and 0.48,corresponding to the pore diameter of 10.1 nm,13.2 nm,15.4 nm and 21.4 nm,respectively.The equilibrium loading amount of LYS on SBA-15 materials with pore size of 15.4 nm could be up to 1000 mg·g-1.The coefficient of effective use of surface area of mesoporous molecular sieve with diameter of 3.9 nm,7.4 nm,10.1 nm,13.2 nm and 15.4 nm was 0.10,0.47,0.56,0.71 and 0.79,respectively.It is also noted that greater pore size of mesoporous molecular sieve would lead to a higher coefficient of effective use of surface area. 相似文献
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采用酯交换工艺,在均相条件下,由甲基丙烯酸甲酯和正丁醇合成了甲基丙烯酸丁酯(BMA),选择了化学稳定性好,反应活性高,后处理简单并且可较长时间回收利用的催化剂,以及阻聚效果良好的阻聚剂,该工艺明显缩短了反应时间,提高了BMA的收率,并且具有反应条件温和,操作简便,产品纯度高(≥99.5%)等优点。 相似文献
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刁香 《精细石油化工进展》2010,11(7):29-31
介绍了采用溶胶-凝胶法制备介孔分子筛SBA-15的方法;用氮吸附BET法测定介孔分子筛SBA—15比表面积、孔容及孔径分布,用高分辨透射电子显微镜JEM2010观察介孔分子筛SBA-15颗粒形貌及孔道结构。结果表明,合成的介孔分子筛SBA-15具有较大的比表面积和孔容,并具有双重孔结构,小孔孔径为3.8nm,大孔孔径为10.0—13.0nm;介孔分子筛SBA-15颗粒具有规则外形,孔道结构有序。 相似文献
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刁香 《精细石油化工进展》2007,8(5):32-36
简要介绍了富马酸二甲酯的性质,包括物理性质、作用机理.重点介绍了富马酸二甲酯的合成方法,包括以富马酸、顺酐、糠醛为原料的合成方法. 相似文献
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介绍了异辛酸的国内外生产及需求情况,综述了异辛烯醛经加氢、氧化合成异辛酸工艺的研究进展。建议国内采用醛氧化法工艺,尽快建立异辛酸生产装置,以满足异辛酸不断增长的需要。 相似文献
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异丁醛氧化制异丁酸的工艺研究 总被引:1,自引:0,他引:1
采用自制催化剂,对异丁醛液相氧化制异丁酸的工艺进行考察。结果表明,在反应温度20~50℃、氧醛摩尔比1.2:1、催化剂用量占异丁醛总质量的0.01%~0.05%、反应时间3~4h条件下,异丁醛转化率大于99.5%,异丁酸选择性在90%以上,分离精制后异丁酸产品纯度高于99.3%。 相似文献
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