Carboxyl-modified hierarchical wrinkled mesoporous silica supported TiO2 nanocomposite particles with excellent photocatalytic performances

Titanium dioxide (TiO₂) is a common photocatalyst for organic pollutants degradation. However, in practical application, the poor adsorption capacity of pure TiO₂ seriously impeded its efficiency in the degradation of organic molecules. In this work, a series of hierarchical wrinkle mesoporous silica supported TiO₂ nano-composite particles (TiO₂ @WMS-COOH) were successfully prepared. Thanks to their high surface areas, large pore volumes and mesoporous structures, these materials showed high adsorption capacity and excellent photocatalytic performance towards dye molecules, which is comparable to or even better than commercial catalyst P25. Moreover, their photocatalytic efficiency can be further enhanced by increasing the calcination temperature during preparation process. Therefore it can be concluded that the TiO₂ @WMS-COOH particles may find promising applications in the photodegradation of organic pollutants.     

介孔氧化铝空心球的制备及表征

以掺氮碳球为硬模板,F127为软模板,廉价的Al(NO3)3·9H2O为铝源,成功制备出具有介孔结构的氧化铝空心球。通过SEM,N2吸附-脱附,XRD,FT-IR表征显示,其粒径大小均一,均在500nm左右;壳层具有蠕虫状的介孔结构,且主要为无定型结构的氧化铝;介孔孔径为17nm,比表面积为153m2/g,孔容为0.67cm3/g。详细讨论了介孔氧化铝空心球的形成机理。     

球形氧化镍粉末对乙醇的电催化性能的研究

通过水热-热分解法制备球形介孔氧化镍粉末,并采用X射线衍射、扫描电镜、透射电镜和比表面积仪对氧化镍粉末的形貌和结构进行表征;通过循环伏安法、计时电流法和电化学阻抗谱的测试,系统研究该种粉末在碱性介质中对乙醇的电催化氧化活性.结果表明：所得到的氧化镍粉末为球形,比表面积为35 m2·g-1,平均孔径为15.88 nm;该粉末对乙醇具有良好的催化活性,氧化电流随乙醇浓度和扫描速率的增大而增大,在0.60 V电位下保持1000 s,球形多孔氧化镍对乙醇氧化催化的电流衰减率为0.075%,稳定性比较好.循环伏安法、计时电流法和电化学阻抗谱测试表明,球形介孔NiO/玻碳电极( NiO/GCE)对乙醇的催化氧化反应机理为扩散控制.     

氨基化的介孔二氧化硅纳米材料与pDNA作用

采用共沉淀法合成高度有序、分散性良好的氨基化介孔二氧化硅纳米材料(Am-MSNs),并研究其吸附和保护质粒DNA(pDNA,PEGFP-N3)的性质,测定样品材料对A549和HeLa细胞的生物相容性.实验结果表明:Am-MSNs能有效吸附PEGFP-N3,并保护PEGFP-N3免受限制性内切酶的消化;Am-MSNs对A549和HeLa细胞表现出较高的生物相容性,当材料的质量浓度为125μg/mL时,两种细胞的存活率均约为100%.     

Biosensors based on acetylcholinesterase immobilized on mesoporous silica thin films

Using tetraethoxysilane and 3-aminopropyltriethoxysilane as the silica sources, amino-functionalized mesoporous silica thin films with 3-dimensional cubic structure have been deposited on conducting ITO substrate in the presence of surfactant F127 templates under acid conditions. The acetylcholinesterase （AchE） and cytochrome c （Cyt c） were incorporated into the pores of mesoporous thin films, and an amperometric biosensor was obtained. After adsorption of AchE and Cyt c, the ordered cubic structure of mesoporous silica and the bioactivities and electrochemical activities of the immobilized protein and enzyme molecules were retained. The sensor properties of the biosensor were investigated by using acetylthiocholine iodide as the substrate and Cyt c as the electron transfer mediator. The inhibition versus the logarithm of concentration was found to be linear to organophosphorus pesticide dichlorvos over the concentration ranges of 1.0×10-8 mol/L to 1.0×10-3 mol/L with the detection limit of 3.1×10^-9 mol/L.     

双金属改性介孔分子筛的研究进展

总结近年来各种类型双金属改性的介孔分子筛的制备方法及在有机合成中应用,并对其发展趋势进行展望.     

Al-MCM-41催化合成TEC

实验利用含铝中孔分子筛Al-MCM-41作催化剂,用乙醇和柠檬酸为原料,直接用反应物乙醇作带水剂,采用分批补充乙醇的工艺方法合成了环保增塑剂柠檬酸三乙酯(TEC).通过催化剂对比和用量实验得出中孔分子筛Al-MCM-41可作为合成TEC高效而环保的固体酸催化剂.     

磁性介孔二氧化硅的合成及其在肿瘤治疗中的应用

肿瘤发病率的逐年上升,严重威胁着人类的健康和生命,在人类与癌症斗争的过程中发展出了许多具有治疗前景的纳米治疗平台.其中,磁性介孔二氧化硅纳米球（MAG-MSNs）被认为是一种具有研究前景的纳米材料.MAG-MSNs具有易制备、低成本、易改性、生物安全性高等特点,提高了材料的性能,使得材料在光热治疗（PTT）肿瘤及化学动力学治疗（CDT）肿瘤等方面具备了一定的应用前景.综述了具有核壳结构MAG-MSNs的结构特点与制备方法,以及其在肿瘤治疗领域中的研究进展.     

混合液晶模板法合成六方介孔氧化硅分子筛

利用十六烷基三甲基溴化铵(CTAB)与脂肪胺(C     

室温强酸性介质合成MCM—41介孔分子筛：（Ⅱ）辅助模板剂对MCM—41介孔分子筛

通过添加辅助扩孔溶剂１,３,５－三甲基苯,有效地扩大了在室温强酸性介质中合成的ＭＣＭ－４１介孔分子筛材料的孔径。实验表明,合成扩孔的ＭＣＭ－４１样品的最佳实验条件与常规未加扩孔剂时合成ＭＣＭ－４１时显著不同,延长混合晶化时间是取得扩孔效果和和高结晶度样品的关键因素。