功能化介孔硅在放射性水处理中的研究进展

阐述了介孔硅的成型原理、介孔硅材料对重金属及放射性核素吸附作用机理.介绍了近十年功能化介孔硅基材料在放射性废水处理方面的研究进展,着重探讨了其表面功能化的最常见官能团对Co、Cs、Sr、U等放射性核素的处理.系统分析了介孔硅吸附剂对核素处理效果的影响因素(介孔硅形貌、功能团、核素类型、吸附条件等)及材料在功能化研究与应...     

功能化介孔碳的制备及在吸附领域的研究进展

介绍了有序介孔碳的制备、功能化改性方法和机理及在吸附领域的应用,并针对目前存在的问题,综述了国内外对介孔碳功能化的研究进展。     

氨基功能化介孔硅材料对SO_2吸附性能研究

以十六烷基三甲基溴化铵作为结构导向剂,正硅酸乙酯作为硅源,3-氨基丙基三乙氧基硅烷作为功能基团,采用共缩聚的方法制备了一系列氨基功能化介孔硅材料(AFM),并研究其对二氧化硫气体的吸附性能。采用N2吸附、X射线衍射、红外光谱、透射电镜等手段对材料进行表征。实验结果表明,氨基功能化介孔硅材料具有较大的比表面和孔体积,对酸性二氧化硫气体有较强的吸附能力。     

功能化介孔材料吸附性能与机理的研究进展

综述了功能化介孔材料的孔径结构、改性基团和吸附条件对废水中的有机污染物、染料分子和重金属离子以及生物大分子、药物分子、CO2和挥发性有机气体污染物的吸附脱除效果的影响,还介绍了功能化介孔材料对液晶材料中的微量无机离子和大极性有机杂质的吸附脱除效果,指出了新型功能化介孔材料的开发和吸附环境的研究是未来的研究热点和发展趋势。     

介孔分子筛表面功能化研究进展

对介孔分子筛表面功能化的修饰方法及工艺进行综述,得到一些关于研究方向上的建议.介孔分子筛的表面功能化的主要工艺有化学修饰法、杂原子取代法.酸催化杂合、金属有机化合物表面接枝反应等.金属有机化合物近几年得到广泛应用,效果良好,作为研发重点,生产方向得以向这方面转移.     

基于氨基功能化介孔硅的Pb^2+选择性吸附剂

采用后接枝法将氨丙基三乙氧基硅烷接枝到二氧化硅网络中，合成了氨丙基功能化的MCM-41介孔硅。FTIR结果显示，氨基被共价键键合到了介孔硅基体上。实验结果表明，所制备的功能化材料可以选择性吸附水溶液中的pb2＋，最大吸附量为193mg·g1。     

基于氨基功能化介孔硅的pb2＋选择性吸附剂

采用后接枝法将氨丙基三乙氧基硅烷接枝到二氧化硅网络中,合成了氨丙基功能化的MCM-41介孔硅.FTIR结果显示,氨基被共价键键合到了介孔硅基体上.实验结果表明,所制备的功能化材料可以选择性吸附水溶液中的Pb2+,最大吸附量为193 mg·g-1.     

介孔吸附剂在水处理中的应用研究进展

介孔材料由于具有比表面积大、孔隙率高、孔径分布均匀、表面富含不饱和基团以及长程结构有序等优点而在化工、生物医药、环境保护和功能材料等领域具有广阔的应用前景。全面综述了介孔吸附剂在处理电镀、染料、造纸、化工、冶金等领域废水中的应用,并就该类材料在其应用中存在的问题及研究方向做了简要论述。     

周期性介孔有机硅的功能化及应用研究进展

周期性介孔有机硅(PMOs)与传统后处理接枝有机官能团的硅基介孔材料相比,有机基团均匀分布于骨架中,不会阻塞孔道、占据孔容,其分子结构可调。通过调节骨架中有机基团的种类可以改变材料的物理、化学及生物等特性。本文综述了周期性介孔有机硅材料的最新研究进展,介绍了PMOs的功能化、应用及潜在应用领域。     

硬脂酸单甘酯模板法制备介孔硅材料及功能化

以硬脂酸单甘酯非离子表面活性剂为模板剂,采用模板法自组装合成了具有介孔结构的新型纯硅基材料,并在此基础上添加镁铝改性合成了新型功能化介孔材料,采用XRD和N2物理吸附 脱附等方法进行表征,结果表明,活性物种进入了介孔硅的骨架并保持了介孔结构特征,活性物种在母体表面分散较好。以十八酸和丙三醇的酯化反应作为探针反应考察其催化性能,结果表明,功能化介孔材料有较好的酯化反应活性。     

Removal of aqueous toxic Hg(II) by functionalized mesoporous silica materials

BACKGROUND: Hg(II) is one of the most toxic metals and has received particular attention in environmental pollution. Hg(II) pollution is common in water sources, so rapid and efficient methods must be developed for its removal from water samples. Mesoporous silica (MS) is an ideal adsorbent due to its high surface area and biocompatibility. The efficiency and selectivity of MS adsorbents can be improved by surface modification. RESULTS: A new sorbent for trace Hg(II) removal was developed by grafting 1‐(3‐carboxyphenyl)‐2‐thiourea (CPTU) onto SBA‐15 mesoporous silica. The optimum pH range for Hg(II) adsorption was 3‐7 and the maximum static adsorption capacity was 64.5 mg g^?1. An enrichment factor of 150 was obtained with a relative standard deviation < 1.5% (n = 8). Common coexisting ions did not interfere with the adsorption of Hg(II) under optimal conditions. Quantitative recovery was achieved by stripping with a mixed solution of 1 mol L^?1 HCl and 5% CS(NH₂)₂. Efficient adsorption capacity of the recycled material could still be maintained at a level of 95% at the 7th cycle. CONCLUSION: 1‐(3‐carboxyphenyl)‐2‐thiourea functionalized SBA‐15 mesoporous silica was synthesized and applied for Hg(II) removal from water samples with high efficiency and selectivity. Copyright © 2012 Society of Chemical Industry     

Mono- and quaternary-ammonium functionalized mesoporous silica materials for nitrate adsorptive removal from water and wastewaters

Mesostructured porous silica SBA-15 materials functionalized with either primary or quaternary ammonium groups have been prepared by co-condensation and post-synthesis grafting using either aminopropyltriethoxysilane or N-((trimethoxysilyl)propyl)-N,N,N-trimethylammonium chloride as functional groups precursors. The materials functionalized with aminopropyl groups were further treated in acid solutions to convert the amine groups into charged propyl-ammonium groups. The physicochemical characteristics of the resulting adsorbent materials have been investigated using various techniques and discussed with respect to the nature of organo-functional groups in the materials. The adsorption performances were evaluated from batch experiments for the removal of nitrate anions from aqueous solutions. Results showed that adsorption capacity was influenced by the organic functional group nature and the functionalization strategy. In the case of propyl-ammonium functional groups, the adsorption capacity reached 46 and 55 mg NO₃ ^?/g for the materials synthesized via co-condensation and grafting, respectively. Similar tendency was observed in the case of propyl-trimethyl-ammonium organic functional groups where the grafted material registered a remarkably high capacity of 63 mg NO₃ ^?/g under the experimental conditions investigated.     

多氨基含氮配体改性有序介孔材料的制备及对铀(Ⅵ)的吸附性能研究

利用溶胶-凝胶法制备了有序介孔材料MCM-41,并用四乙烯五胺对其进行修饰,制备了多氨基改性的介孔氧化硅吸附剂。采用低温氮吸附(BET)、扫描电镜(SEM)、红外光谱(IR)、X射线粉末衍射(XRD)对材料进行表征。BET比表面积为1 052 cm~2/g,孔容为1.194 m L/g,平均孔径为3.86 nm。当pH=5.2,吸附时间30 min,初始浓度120 mg/L时,吸附剂对铀酰离子的吸附达到454 mg/g。     

多氨基含氮配体改性有序介孔材料的制备及对铀(Ⅵ)的吸附性能研究

利用溶胶-凝胶法制备了有序介孔材料MCM-41,并用四乙烯五胺对其进行修饰,制备了多氨基改性的介孔氧化硅吸附剂。采用低温氮吸附(BET)、扫描电镜(SEM)、红外光谱(IR)、X射线粉末衍射(XRD)对材料进行表征。BET比表面积为1 052 cm²/g,孔容为1.194 m L/g,平均孔径为3.86 nm。当pH=5.2,吸附时间30 min,初始浓度120 mg/L时,吸附剂对铀酰离子的吸附达到454 mg/g。     

功能性介孔氧化硅对六价铬的吸附研究进展

为了给以后去除六价铬提供一定思路,以介孔氧化硅为基质材料,总结了用有机官能团修饰、与其他材料(石墨烯氧化物、磁性材料和碳点)复合的功能性介孔氧化硅材料对六价铬的吸附研究,并对今后这类功能性材料进一步展望,以期能更加经济有效去除六价铬。     

功能性介孔氧化硅对六价铬的吸附研究进展

为了给以后去除六价铬提供一定思路,以介孔氧化硅为基质材料,总结了用有机官能团修饰、与其他材料(石墨烯氧化物、磁性材料和碳点)复合的功能性介孔氧化硅材料对六价铬的吸附研究,并对今后这类功能性材料进一步展望,以期能更加经济有效去除六价铬。     

A mesoporous silica functionalized by a covalently bound naphthalene-based receptor for selective optical detection of fluoride ion in water

The naphthalene urea fluorescent receptor 1 immobilized mesoporous silica (FMS) and the fluorescent receptor 1 immobilized silica particles (FSP) were prepared via sol–gel reaction. The sensing ability of FMS and FSP was studied by addition of the anions F^–, Cl^–, Br^–, I^– and to water suspensions of the assayed solid. Of all the anions tested, addition of fluoride ion to a suspension of FMS resulted in the largest decrease in the fluorescence intensity of naphthalene of FMS. Thus, fluoride ions bind with four urea N–H protons of receptor 1 onto FMS. On the other hand, addition of Cl^–, I^–, Br^– and did not reduce the fluorescence of FMS. In case of FSP, the sensitivity for fluoride ion was 8 times lower than that of FMS due to immobilization of smaller amounts of receptor 1 in silica particles. The result implies that mesoporous silica with its large surface area is useful as a supporting material.     

Development of functionalized chitosan-coated carboxylated mesoporous silica: a dual drug carrier

The principle aim of the present study is to synthesis a novel mesoporous silica-based dual drug delivery system (DDDS) with unique features for the delivery of amoxicillin (antibiotic) and thiamine hydrochloride (vitamin). The DDDS was characterized by Fourier transform infrared, X ray diffraction, differential scanning calorimetry, scanning electron microscopy and atomic force micrographs analyses. The stimuli response behaviour of the drug carrier was studied by conducting swelling experiments as a function of pH and time. Drug release studies were carried out by mimicking gastric and intestinal conditions and found that the release of both drugs attained its maximum in the intestinal condition. The in vitro release data were analysed using Peppa’s potential equation in order to predict the release mechanism. The release of antibiotic follows non-Fickian mechanism whereas that of vitamin was diffusion controlled. An in vitro cytotoxicity analysis was carried out on L929 cells and the results showed that the synthesized DDDS is safe. DPPH assay and antibacterial activity were also analysed. From the investigation, it is evident that the prepared DDDS has potential application as dual drug carrier.     

Using mesoporous silica materials to immobilise biocatalysis-enzymes

Biocatalysis could gain an enhanced breakthrough with the introduction of novel mesoporous silica materials as enzyme carriers: the dimensions of most of the enzymes are within the pore size range of these new silica materials and a broad spectrum of enzymes can be immobilised. These materials moreover have (i) a uniform pore size distribution, (ii) a high specific surface area and pore volume and (iii) are easy to functionalise. This paper introduces fundamental aspects and techniques to immobilise enzymes on a carrier.     

A novel nonsurfactant pathway to hydrothermally stable mesoporous silica materials

A novel way is described to tune the pore diameters of the hydroxy-carboxylic acid templated mesoporous silica materials by adding different amount of aluminum chloride to the synthesis mixture for the sol–gel reactions, and these silica materials obtained have higher hydrothermal stability than those prepared without AlCl₃.