41results about How to "Green and mild reaction conditions" patented technology

The invention discloses a polycarbazole-loaded nano-palladium material, a preparation method and application thereof. Specifically, the average particle size distribution of the palladium nanoparticles prepared in the present invention is about 4.2 nm, and they are uniformly dispersed on the substrate polycarbazole material. The material can catalyze the Suzuki reaction involving aryl bromide and aryl chloride under light and water phase conditions, and has the characteristics of high conversion efficiency, wide application range, and green and mild reaction conditions. After the conversion reaction, the substrate is separated from the reaction system, and the catalytic system can proceed to the next round of reaction, and it remains stable after 3 cycles, and its catalytic activity does not decrease significantly.

The invention discloses a cobalt-iron bimetallic catalytic material based on MOF-74, a preparation method and application thereof. In the present invention, the metal salt and the organic ligand are added into the solvent in a molar ratio (1-5): 1, stirred uniformly and then transferred to a polytetrafluoroethylene reactor; wherein, the metal salt is composed of cobalt-containing metal salt and cobalt-containing Composed of iron metal salt, and the molar ratio of cobalt and iron in the metal salt is (1-9): (1-9); put the polytetrafluoroethylene reactor into an oven and react at 100-160 ° C for 12-72 hours, A cobalt-iron bimetallic catalytic material based on MOF‑74 was obtained. The cobalt-iron bimetallic catalytic material combined with persulfate can efficiently and deeply degrade various organic pollutants in water. The cobalt-iron bimetallic catalytic material-persulfate catalytic system based on MOF‑74 can be applied to deep purification of organic pollution sewage.

The invention relates to chemical synthesis methods and aims to provide a method for synthesizing N-substituted carbazole. The method comprises the following steps: adding halogenated N-substituted diphenylamine and a ligand into the same solvent for dissolving, dripping the obtained solution into potassium tert-butoxide, and stirring and reacting at the temperature of 30-160 DEG C for 6-12 hours; adding saturated sodium chloride to carry out a quenched reaction, extracting for three times by using ethyl acetate, and merging the organic phase; drying anhydrous sodium sulfate, filtering, performing reduced pressure distillation, removing the ethyl acetate, and performing thin-layer chromatography separation, thereby obtaining the N-substituted carbazole. According to the method disclosed by the invention, the defect in the prior art that transition metals are used is overcome, the reaction conditions are green and mild, and the method is suitable for industrial production.

The invention relates to a method for in situ synthesis of gold nanorods / graphene oxide composite material.The method comprises concrete steps: mixing graphene oxide modified by sodium polystyrenesulfonate, a secondary growth solution of growth gold nanorods and gold seeds; and standing the mixture at constant temperature for a period of time. The method for in situ synthesis of gold nanorods / graphene oxide composite material has following beneficial effects: the method has a green and moderate reaction condition and high repeatability and is easily applied; gold nanorods / graphene oxide composite material prepared by the method has high loading capability; gold nanorods are distributed uniformly; and the method has a broad prospect for integration of diagnosis and treatment by means of increase in efficiency of photothermal therapy and subsequent moderation of antibodies and drug loads.

The invention discloses a synthesis method of trans-alpha-benzoinoxime and belongs to the field of the organic chemical synthesis technology. The trans-alpha-benzoinoxime is represented by a structural formula (I). The synthesis method comprises catalyzing benzaldehyde through imidazole salt ion liquid, enabling the catalyzed benzaldehyde and benzoin to perform condensation reaction under the alkaline condition to generate alpha-benzoin, enabling alpha-benzoin crude products to be crystallized again, enabling the crystallized alpha-benzoin crude products to react with hydroxylamine hydrochloride or hydroxylamine sulphate to generate the trans-alpha-benzoinoxime, and separating the trans-alpha-benzoinoxime through column chromatography to obtain purified products. The synthesis method of the trans-alpha-benzoinoxime is simple, convenient, mild and environment-friendly in reaction condition, easy to implement, good in yield, low in cost, simple in product purification and capable of obtaining high-purity trans-alpha-benzoinoxime.

The invention relates to a synthesis method for a polybrominated benzene [1.3] oxazine derivative, comprising the following steps of: carrying out reaction of compounds shown in formula (I) and N-bromo-succinimide (NBS) in a solvent at 25-100 DEG C to obtain the polybrominated benzene [1.3] oxazine derivative shown in formula (II) after the reaction is completed. The compounds shown in the formula(I) and the formula (II) are as shown in the description, wherein R is chosen from phenyl, substituted phenyl, C1-C5 alkyl (preferably isopropyl) or thiophene. The synthesis method has the advantagesof being mild in reaction conditions, environment-friendly, simple in operation and capable to obtain polybrominated benzene oxazine compounds which cannot be obtained by conventional methods throughone pot multi-step reaction.

The invention belongs to preparation of nano composite materials, and the field of environmental governance, and discloses a preparation method of a carbon quantum dot CQDs hybridized CdIn2S4 composite material and a catalysis property of the carbon quantum dot CQDs hybridized CdIn2S4 composite material. The preparation method comprises the following steps: by taking carbon quantum dot CQDs and CdIn2S4 nanoparticles as raw materials, mixing the raw materials according to a certain ratio, and preparing a CdIn2S4 composite material nanoparticle composite photocatalyst which is hybridized with CQDs in different ratios by using a backflow method. The composite photocatalyst prepared by using the method can be used for degrading rhodamine B and an antibiotic levofloxacin in the presence of visible light. The material has the advantages that n the preparation method is simple, the cost is low, the energy consumption is small, the raw material is rich and clean, the reaction condition is gentle and the like; the carbon quantum dot CQDs hybridized CdIn2S4 composite photocatalyst is a good visible light response type composite photocatalyst, shows excellent photoproduction electron separation efficiency and excellent visible light catalysis activity, and has important application prospects in organic wastewater treatment.