2results about How to "PH responsive" patented technology

The invention provides a preparation method of a modified ferruginous mineral loaded amphoteric polymer heavy metal adsorbent, which comprises the following steps: I, pretreating a mineral matrix, namely crushing, grinding and sieving ferruginous raw ore to obtain mineral powder, grinding and sieving biochar to obtain biochar powder, and calcining and activating the mineral powder and the biochar powder in a muffle furnace to obtain a modified ferruginous mineral loaded amphoteric polymer heavy metal adsorbent; naturally cooling to obtain a calcined modified mineral matrix; iI, preparing a precursor dispersion liquid, namely adding the calcined modified mineral matrix into an organic solvent, performing ultrasonic dispersion at room temperature for 20-40 minutes to obtain a uniform mineral dispersion liquid, sequentially adding an amino monomer, an acrylic monomer, a cross-linking agent and an initiator into the dispersion liquid, and uniformly stirring and mixing to obtain a polymerized precursor liquid; iII, in-situ polymerization reaction: continuously introducing nitrogen into the polymerization precursor liquid to remove air in the system, sealing, and carrying out in-situ free radical polymerization reaction in a constant-temperature environment to obtain a solid-phase product; and IV, post-treatment: sequentially washing the solid-phase product with methanol and deionized water for multiple times to remove unreacted monomer and oligomer impurities, and then drying, grinding and sieving to obtain the magnesium iron mineral loaded amphoteric polymer heavy metal adsorbent. The method can be flexibly applied according to actual wastewater pH characteristics, and the defect that a traditional adsorbent can only treat single type of heavy metal or needs to frequently adjust the pH is overcome.

This invention relates to the field of biomedical technology and provides a method for preparing uracil-modified gold nanoconjugated materials and their applications. The method includes the following steps: in the presence of a reducing agent, a uracil ligand solution is slowly added to a gold precursor solution for a controlled reduction reaction to form gold nanoconjugated materials with an average particle size ≤2 nm; a thiolated uracil derivative is added to the dispersion of the obtained gold nanoconjugated materials, and the pH of the reaction system is adjusted to alkaline, so that the thiolated uracil derivative is bound to the surface of the gold nanoconjugated materials through Au-S bonds, thereby obtaining uracil-modified gold nanoconjugated materials. This material possesses ultra-small size, pH-responsive surface, and selective uptake characteristics by pathogens, enabling it to efficiently penetrate periodontal biofilms and achieve efficient clearance and virulence blocking against periodontal pathogens by interfering with bacterial proton kinetic potential and inhibiting the secretion of virulence factors.