3results about How to "Improve elution efficiency" patented technology

This invention discloses a bismuth-containing composite, its preparation method, and its application in chloride ion elution. The bismuth-containing composite comprises bismuth oxide and a dopant element, which is one or more of titanium, nickel, copper, iron, cobalt, carbon, and nitrogen. As a dechlorination agent, this bismuth-containing composite, by selecting a semiconductor element as the dopant, can reduce the stability of the Bi-O covalent bonds in the sample, making them more susceptible to breakage under hydrogen ion attack, leading to structural collapse and the release of more bismuth ions, thus promoting the dechlorination reaction. Furthermore, after the bismuth-containing composite participates in the dechlorination reaction, the dechlorination product easily forms a heterojunction under light excitation during elution, allowing electrons to transfer to the introduced semiconductor, forming electron-hole pairs. The remaining holes on the bismuth oxychloride undergo photocorrosion, promoting the conversion of bismuth oxychloride to bismuth oxide, facilitating recycling, and improving subsequent dechlorination efficiency.

The invention provides low-sodium pseudo-boehmite and a preparation method of the low-sodium pseudo-boehmite. The preparation method comprises the following steps: uniformly mixing a sodium-containing aluminum source, a fatty amine compound and water to obtain slurry A; wherein the mass ratio of the sodium-containing aluminum source to the fatty amine compound is (0.1-1.5): 1; adding an aluminum salt aqueous solution into the slurry A for reaction, and filtering to obtain a filter cake B; washing the filter cake B with an ammonium salt aqueous solution to obtain a filter cake C; and heating and aging the filter cake C, filtering, washing and drying to obtain the low-sodium pseudo-boehmite. The sodium-containing aluminum source is firstly mixed with the fatty amine compound, so that the elution efficiency of sodium ions from the pseudo-boehmite can be improved, and the content of the sodium ions in the pseudo-boehmite is reduced. In addition, ammonium ion exchange is introduced before pseudo-boehmite is formed, so that the exchange efficiency between ammonium ions and sodium ions is enhanced, and the sodium content is further reduced.

This invention provides a method for separating and extracting lead-212 and bismuth-212 from monazite-processed radium slag dissolution solution, belonging to the field of medical radioisotope preparation technology. The method uses monazite-processed radium slag dissolution solution containing radium-228 decay chain substances as raw material. First, halide ions are added to the raw material and the acidity is adjusted to obtain an acidic radium slag dissolution solution. Then, the solution is pretreated with an anion exchange resin column to remove impurities. After static decay, a decay solution containing lead-212 and bismuth-212 is generated. Utilizing the halogen content and acidic environment of the solution itself, the solution is selectively adsorbed again by an anion exchange resin column. Subsequently, elution is performed using a desorption reagent, and the medium conditions are readjusted for repeated adsorption and desorption, ultimately yielding a high-purity and high-specific-activity lead-212 and bismuth-212 finished desorption solution. This invention can efficiently extract lead-212 and bismuth-212 with fast extraction speed, high recovery rate and purity, and is less likely to cause organic pollution in the product.