5results about How to "Improve adsorption removal effect" patented technology

This invention relates to the field of water pollution control materials technology, specifically disclosing a method for preparing a quaternary ammonium salt modified starch-chitoxin composite gel. First, chitoxin powder is added to a green solvent to obtain a chitoxin solution. Then, a quaternary ammonium salt modified starch dispersion is added to obtain a chitoxin composite solution containing quaternary ammonium salt modified starch. Next, repeated freeze-thaw cycles are performed to obtain a viscous composite. A crosslinking agent is added dropwise to the composite to obtain a crosslinking gel precursor. Finally, the crosslinking gel precursor is soaked in alcohol and washed until neutral to obtain the quaternary ammonium salt modified starch-chitoxin composite gel. The green solvent is a urea-water system of NaOH, KOH, or LiOH; the crosslinking agent is epichlorohydrin or epichlorohydrin. The application of the quaternary ammonium salt modified starch-chitoxin composite gel in the removal of micro / nanoplastics from water is also disclosed. This invention aims to solve the problems of complex synthesis processes, high production costs, and easy secondary pollution associated with existing micro / nanoplastics adsorbent materials.

The present application belongs to the cross field of water treatment technology field and waste shrimp shell resource utilization technology field, and specifically relates to a waste shrimp shell derived chitosan-based iron-carbon composite hydrogel as well as a preparation method and application thereof. The present application carries out overall design around the preparation of chitosan and the forming process of network structure, adopts a betaine-acetic acid low eutectic solvent system to extract chitin in waste shrimp shells, and further converts to obtain chitosan. Meanwhile, carbon nanotubes and nano-ferroferric oxide are introduced into the chitosan system to synergistically regulate the material from two aspects of skeleton support and function supplement. The hydrogel microspheres have good antibiotic adsorption and degradation capacity, and have high application prospect in wastewater treatment in industries such as aquaculture, pharmaceuticals and agriculture.

The application discloses a preparation method of a magnetic fluorine-removing resin. The method comprises the following steps: step 1, preparing an oil-phase dispersible modified iron oxide magnetic material; step 2, preparing a water-phase for suspension polymerization; step 3, preparing an oil phase containing the magnetic material; step 4, forming an epoxy-group-containing magnetic resin skeleton through suspension polymerization; step 5, grafting a nitrogen-containing carboxylic acid functional structure through ring-opening of the epoxy group; step 6, loading a zirconium-based fluorine-removing active component; and step 7, washing and balancing and post-treatment.

The invention discloses a preparation method and application of a modified montmorillonite wetland filler based on wetland hydraulic characteristics. The preparation method comprises the following steps: crushing montmorillonite, sieving, washing, freeze-drying, and roasting at high temperature for pre-activation; soaking the obtained product in diluted hydrochloric acid for reaction, washing, drying, and carrying out high-temperature roasting activation to obtain acid modified montmorillonite; the preparation method comprises the following steps: carrying out a ring-opening reaction on GTA and chitosan according to a mass ratio of GTA isopropanol to chitosan, which is optimally designed according to a Box-Behnken response curved surface, so as to prepare a quaternary ammonium salt chitosan modifier; the preparation method comprises the following steps: dissolving a quaternary ammonium salt chitosan modifier in deionized water according to the mass ratio of the quaternary ammonium salt chitosan modifier to the acid modified montmorillonite which are optimally designed on the basis of a Box-Behnken response curved surface, uniformly mixing with the acid modified montmorillonite, carrying out oscillation reaction in a constant-temperature water bath, and washing, centrifuging and freeze-drying after the reaction is completed. The method has the best adsorption and removal effect on pollutants such as phosphorus, oxygen-consuming organic matters, antibiotics and the like.

A method for preparing a cobalt-based semi-crystalline adsorbent belongs to the field of nanomaterials and environmental materials preparation. This method, based on the addition of auxiliary reagents, effectively improves the electron-donating characteristics of the cobalt-based semi-crystalline adsorbent and enhances its adsorption capacity for heavy metal ions by simultaneously introducing electron-rich terephthalic acid and urea into the system. The invention utilizes auxiliary reagents to adjust the pH of the system while simultaneously promoting the deprotonation process of terephthalic acid and maintaining the coordination activity of urea. This facilitates the rapid self-assembly and assembly process between organic ligands and metal ions at room temperature, ensuring the sufficient introduction of organic ligands with abundant lone pair electrons into the cobalt-based semi-crystalline adsorbent, thereby improving its electron-donating capacity and enhancing its adsorption and removal capacity for heavy metal ions.