4 results about "Selective adsorption" patented technology

The invention discloses a method of separating chiral drug penicillamine enantiomer based on a functional gold nanochannel. The method comprises the steps of by taking a polycarbonate (PC) film as a template, adopting a chemical deposition method to prepare a gold (Au) nanochannel film, and modifying L-cysteine (L-Cys) in the Au nanochannel by utilizing action of an Au-S bond to obtain the nanochannel with chiral site selectivity. The modifier L-cysteine has selective adsorption effect on D- penicillamine (D-Pen), but has repulsive action on L-penicillamine (L-Pen); in mixed liquor containing D-pen and L-Pen, the L-penicillamine can preferably passes through the nanochannel which is modified with the L- cysteine, so that complete separation of the penicillamine enantiomer is realized by utilizing the property. The method disclosed by the invention can be used for separating the penicillamine enantiomer, adopts a simple device, is simple to operate and easy to implement, and has better application prospect.

The invention relates to a preparation method of an adsorption material for selectively adsorbing silver ions. The preparation method comprises the following steps: uniformly dispersing a chitosan-graphene oxide composite material in an acetic acid solution, adding 3-mercaptopropyltrimethoxysilane, uniformly stirring the obtained solution, adding a sodium hydroxide solution to adjust the pH value of the obtained system, adding a glutaraldehyde solution, stirring the solutions to obtain a uniformly mixed solution, standing the uniformly mixed solution at 3-4 DEG C for 20 h or more, and carrying out post-treatment to obtain the mercapto modified chitosan-graphene oxide composite material. The preparation method overcomes the shortcoming of difficulty selective adsorption of the silver ions from a complex environment of adsorption materials in the prior art. The adsorption material prepared in the invention has large adsorption capacity, can quickly selectively adsorb silver ions, and makes the silver ion adsorption balance time much shorter than the adsorption balance time in the prior art.

The invention discloses a monolithic catalyst with organic waste gas selective adsorption and catalytic oxidation functions, a preparation method of the monolithic catalyst and application of the monolithic catalyst in catalytic oxidation treatment of organic waste gas. A double-coating design is adopted. A first coating is a molecular sieve substrate coating, and ensures the coating firmness between a molecular sieve and a cordierite carrier. A second coating is an active component coating, and neutral silica sol is adopted to protect the activity and effectiveness of noble metals and catalytic additives on the molecular sieve. The surface coating layer of the obtained monolithic catalyst is high in loading rate, good in firmness and low in falling rate, the mechanical strength of the obtained monolithic catalyst is remarkably improved, and the service life of the obtained monolithic catalyst is remarkably prolonged. The monolithic catalyst provided by the invention can selectively adsorb VOCs and rapidly desorb generated H2O at the same time, so that the reaction is promoted to be carried out towards the catalytic oxidation direction of VOCs, and the monolithic catalyst has excellent catalytic oxidation performance for VOCs.