31results about How to "Rich in hydroxyl" patented technology

The invention discloses an iron-based biochar material as well as preparation and application thereof. In the invention, by adopting nano alpha-Fe2O3 as a center substance and wrapping the nano alpha-Fe2O3 with aspergillus niger hyphe, the iron-based biochar material for arsenic-polluted soil remediation is prepared through anoxic high-temperature carbonization. The synthesized iron-based biochar material is uniformly mixed with soil according to certain proportion; and after a period of time, the fixed rate of the water-soluble state arsenic and effective-state arsenic in the arsenic-polluted soil reaches 59.6% and 66.2% respectively. The iron-based biochar material disclosed by the invention has the advantages of easiness in preparation, high efficiency without toxicity, biodegradability and no secondary pollution or damage of physicochemical properties of soil and is an environment-friendly fixing agent.

The invention discloses a method for preparing surface-active onion-like carbon nanospheres based on gas phase deposition, which uses liquid organic small molecule alkane n-dodecane as a carbon source, and in an inert carrier gas environment where a ferrocene catalyst exists, the temperature ranges from 650 to The chemical vapor deposition reaction is carried out at a high temperature of 700°C to directly prepare onion-like carbon nanospheres with high surface activity consisting of onion-like graphitized shells coated with ferric oxide nanoparticles. The onion-shaped carbon nanosphere product prepared by the invention has good surface activity and thermal stability, has wide practicability, and can be applied to fields such as adsorption materials, energy storage materials, catalytic materials, and medical materials.

The invention provides a gold-based catalyst, its preparation method and its application in the preparation of MDA reaction, which is characterized in that it includes a carrier, and active components and auxiliary agents loaded on the carrier; the carrier is aluminum Hydroxide; the active component is gold with a content of 0.1-10wt.%; the additive is iron, or iron and iron oxides. In the process of preparing methacrolein dimethyl acetal with methanol, methacrolein and oxygen as raw materials, the gold-based alloy catalyst obtained in the present invention has a conversion rate of methacrolein of more than 80% and a selectivity of MDA of up to 90%. Above, compared with the prior art, the yield of MDA is greatly improved, and the large-scale industrial preparation of MDA is realized.

The invention provides a carbon nitride / lanthanum hydroxide nanofiber membrane, a preparation method and application thereof. Combining nanofiber loading and the characteristics of lanthanum electron-deficient orbitals, electrospun nanofiber membranes are used as scaffolds to load carbon nitride to prevent carbon nitride agglomeration, increase its specific surface area, and grow hydrogen in situ on carbon nitride sheets Lanthanum oxide, using the unique electron-deficient orbital structure of lanthanum hydroxide, promotes the separation of photogenerated electrons and holes in carbon nitride, thereby improving the photocatalytic activity. In the prepared carbon nitride / lanthanum hydroxide nanofiber membrane, carbon nitride and lanthanum hydroxide are wrapped in nanofibers, and lanthanum hydroxide nanosheets are grown on the carbon nitride sheet in situ. The prepared carbon nitride / lanthanum hydroxide nanofiber membrane can be used for catalytic degradation of dyes and catalytic hydrogen production under visible light. The invention solves the problems of easy agglomeration of carbon nitride, cumbersome post-treatment, low utilization rate of visible light and the like.

The invention discloses an ordered organic-inorganic hybrid mesoporous silicon dioxide, a gold-loaded nanometer material and a preparation method thereof. In the presence of a neutral long-chain templating agent, ethyl orthosilicate is mixed with an imidazole-based ionic liquid organofunctionalized siloxane pass-through body containing a thioether, and the ionic liquid containing a thioether is synthesized at a certain temperature in the next step. Organic-inorganic hybrid mesoporous silica materials. Then auric chloride (HAuCl4) was directly reduced by utilizing the abundant hydroxyl groups on its pore surface, while the thioether organofunctional group in the organic group was used to stabilize the reduced gold particles. The preparation process is simple, no additional reducing agent is needed, and the method is beneficial to environmental protection. The prepared nano-gold particles have the characteristics of small average particle size and uniform distribution, showing good prospects for catalytic application.