Preparation method and application of magnetic adsorption microspheres containing ultrahigh-density quaternary ammonium groups

• Main Authors: XU BINCHENG, SUN KUIYUAN, WU QU, SUN YONGJUN, ZHENG CHAOFAN
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2024
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a preparation method and application of magnetic adsorption microspheres containing ultrahigh-density quaternary ammonium groups. The preparation method comprises the following specific steps: adding chitosan, magnetic nanoparticles and a cationic monomer containing quaternary ammonium groups into a dilute acetic acid solution with a certain concentration according to a corresponding proportion, and fully mixing; dropwise adding the obtained mixed gel into a strong alkali solution to obtain gel microspheres with uniform size, standing and curing, washing with deionized water, and putting into a glutaraldehyde aqueous solution with a certain concentration for cross-linking reaction; and washing the obtained product, and drying. Through blending, the density of quaternary ammonium groups on the microspheres is increased, so that the surface electrostatic field intensity of the adsorbent is improved, the rapid mass transfer of negatively charged Cr (VI) in water to an adsorption site is e