5 results about "Mesoporous silica" patented technology

The invention relates to the field of photocatalysis, and particularly relates to a visible-light-driven photocatalyst for degrading dye in wastewater, and preparation and application thereof. The visible-light-driven photocatalyst for degrading dye in wastewater is characterized in that mesoporous silicon dioxide of which the framework contains Ti atoms is used as a carrier, the mesoporous silicon dioxide carrier carries graphitic carbon nitride, and bivalent Cu ions are doped on the graphitic carbon nitride, wherein the graphitic carbon nitride with the doped cupric ions serves as a main catalyst, and the element Ti serves as a cocatalyst. The Ti atoms contained in the framework of the mesoporous silicon dioxide directly react with H2O2 in a photo-Fenton-like system to produce hydroxyl free radicals, thereby obviously improving the photo-Fenton-like reaction activity. The photocatalyst provided by the invention catalyzes degradation of methyl orange and/or rhodamine B in wastewater, and degradation can be performed at room temperature under the irradiation of visible light, thereby enabling the photocatalyst to have the advantages of mild reaction conditions, low cost and easy implementation; and the photocatalyst can be easily regenerated, and still has excellent photocatalytic performance after being regenerated many times.

The invention discloses a preparation method of a mesoporous silica in situ doped acrylic resin bone cement composite for enhancing durable release capacity of medicines. The preparation method comprises the steps of firstly, mixing an amino silicon dioxide nanometer material with bone cement liquid to obtain a mixture, mixing the mixture with a bone cement solidifying agent, and in the process ofa polyreaction, performing in-situ introduction of the mesoporous silica nanometer material containing medicines; and uniformly mixing a mesoporous silica material with the liquid agent, and besides,enabling amino and carboxyl in bone cement acrylic resin to form electrostatic interaction to realize uniform and stable distribution in the bone cement, and achieve the purpose of durable and uniform release of the medicines. The prepared composite is high in operability, self spaces can be used for efficiently loading the medicines, and unique 2-8-nm mesoporous bore diameter is designed to enable the medicines distributed in the deep layer of the bone cement to be slowly released to the outside of the cement, so that durable and efficient release of the medicines is realized, besides, the characteristic and the function of the bone cement can be individually improved, and the biocompatibility and the anti-infection characteristic of the bone cement can be improved.

The invention relates to the technical field of medical materials, and particularly discloses a photoresponse silicon dioxide material and a preparation method and application thereof.The photoresponse silicon dioxide material contains dendritic mesoporous silicon dioxide, and the surface of the dendritic mesoporous silicon dioxide is modified with a fluorinated silane coupling agent and grafted with carboxylated spiropyrane. The photoresponse silicon dioxide material has the characteristics of high biocompatibility, good stability, high drug loading capacity, high encapsulation efficiency, low toxic and side effects and the like, and can be used for delivering macromolecular drugs. The photoresponsive silicon dioxide material is converted between hydrophilicity and hydrophobicity under light control, so that the photoresponsive silicon dioxide material has a photoresponsive drug controlled release effect and is suitable for skin drug delivery.

The invention provides a preparation method of a monodisperse mesoporous silica hollow sphere material, the preparation method comprises the following steps: (1) dissolving a catalyst ethidene diamine into a mixed solution of water and ethanol, and stirring to obtain a clear solution; adding an organic silicon source, and stirring at a high speed to form a single-phase system; (2) reacting at the temperature of 15-40 DEG C; (3) dispersing in a two-phase reaction system consisting of water-triethanolamine-hexadecyl trimethyl ammonium chloride and cyclohexane-tetraethyl orthosilicate, and stirring and reacting at the temperature of 40-80 DEG C; and (4) carrying out hydrothermal treatment at 150-200 DEG C, and removing to obtain the monodisperse silicon dioxide hollow sphere material. According to the preparation method, a strategy of combining a liquid phase synthesis method and an oil-water two-phase method is adopted, and the existence forms of silicon dioxide synthesized twice are different, so that internal silicon dioxide components can be selectively etched during hydro-thermal treatment, and the monodisperse mesoporous silicon dioxide hollow sphere material is obtained.