4 results about "Cross linked chitosan" patented technology

The invention discloses a stainless steel pickling waste liquid treatment method, and relates to the technical field of pickling waste liquid treatment.The stainless steel pickling waste liquid treatment method comprises the steps that quaternized iminodiacetic acid functionalized cross-linked chitosan aerogel is prepared, an adsorption column is filled with the quaternized iminodiacetic acid functionalized cross-linked chitosan aerogel, the stainless steel pickling waste liquid is pumped into the adsorption column, and selective adsorption operation is conducted; ni and Cr in the waste liquid are selectively chelated by iminodiacetic acid groups, and F is captured by quaternary ammonium salt groups; when it is monitored that the concentration of Ni or Cr at the outlet end of the adsorption column reaches a preset value, it is regarded that adsorption is saturated, feeding is stopped, and stepwise elution and resource recovery are conducted in sequence; and washing the adsorption column with deionized water until the pH value of an outlet is neutral to complete material regeneration for the next round of adsorption circulation. According to the method, nickel and chromium can be selectively recycled from the strong acid waste liquid, fluorine is synchronously captured, hazardous waste sludge is not produced, the used materials are stable, durable and recyclable, the problems of resource waste and secondary pollution are solved, and recycling and harmless treatment of the waste liquid is achieved.

The present invention relates to a novel cross-linked chitosan and formulations, compositions and uses thereof. In particular, the present invention relates to nanoparticles useful as active agents and delivery systems for at least one biologically active agent and compositions thereof.

The present application provides a modified oxygen-releasing nano-peroxide for degrading organic pollutants, a preparation method therefor and a use thereof, and a composite slow-release oxygen material, a preparation method therefor and a use thereof. The modified oxygen-releasing nano-peroxide comprises an oxygen-releasing nano-peroxide, a pH regulator, a polyvinyl alcohol-poly(N-isopropylacrylamide) membrane layer, and a cross-linked chitosan membrane layer. The polyvinyl alcohol-poly(N-isopropylacrylamide) membrane layer encapsulates the oxygen-releasing nano-peroxide and the pH regulator, and the cross-linked chitosan membrane layer encapsulates the polyvinyl alcohol-poly(N-isopropylacrylamide) membrane layer. The modified oxygen-releasing nano-peroxide has high purity and good dispersibility, can maintain stable dissolved oxygen content in water for a relatively long time, and has minimal impact on the environmental pH.

In various aspects, the present invention relates to methods of treating or preventing bleeding of a tissue site comprising applying a chitosan powder composition to a tissue site. In various aspects, the present invention relates to a chitosan powder composition for application to a tissue site, where the powder composition comprises a chitosan salt, a crosslinked chitosan, a derivatized chitosan, or a combination thereof. In various aspects, the invention relates to a catheter assembly preloaded with a chitosan powder composition and configured to deliver the chitosan powder composition to a tissue site.