10 results about "Cadmium ion" patented technology

The application discloses a method for improving the cadmium ion adsorption capacity of Escherichia coli, and belongs to the technical field of genetic engineering. E. coli BL21 to Cd 2+ , and the unit point mutation of T16C, K19C and S45C to CeMT2 can significantly improve the Cd 2+ binding capacity of CeMT2, and the cell Cd 2+ concentration of the T16C, K19C and S45C mutants is increased by 1.32 times, 1.50 times and 1.41 times, respectively. E. coli The recombinant expression of CeMT2 (K19C) and LmCadC in BL21 can obviously improve the cadmium ion adsorption capacity of Escherichia coli, and the maximum adsorption capacity reaches 8.5 mg / g.

This invention belongs to the technical field of metal ion adsorption materials, specifically a method for preparing an adsorbent and a method for determining the soluble zinc content of raw materials used in the ammonia chloride process for producing electrolytic zinc. This invention modifies the surface of manganese dioxide with a thiourea-based silane coupling agent, grafting a silane coupling agent containing a thiourea structure onto the surface of manganese dioxide. The adsorption of lead, copper, and cadmium ions in solution is achieved using the manganese dioxide matrix and the thiourea-based silane coupling agent on the matrix surface, while effectively preventing the adsorbent from adsorbing zinc ions from the solution. When the adsorbent prepared by this invention is used to determine the soluble zinc content of raw materials used in the ammonia chloride process for producing electrolytic zinc, it exhibits a small testing error and can effectively improve the accuracy of soluble zinc content determination.

The application provides a water-based cadmium ion-vanadium dioxide battery and a preparation method and application thereof, and relates to the field of marine energy storage.The application comprises a negative electrode, a positive electrode, a diaphragm and a water-based electrolyte; the negative electrode is metal cadmium or a cadmium-based alloy; the active substance of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the water-based electrolyte is an aqueous solution containing cadmium salt; and the total concentration of the cadmium salt in the water-based electrolyte is 1-4 mol / L.The water-based vanadium dioxide-cadmium metal secondary battery has the advantages of a safe water-based electrolyte system, high rate performance and super-long cycle life, and has significant advantages in marine energy storage.

The application discloses a method for detecting cadmium ions and lead ions in water by using a screen-printed electrode electrochemical sensor, and comprises the following steps: taking a screen-printed electrode with a ZIF-8 / MWCNT nanocomposite modified on the surface of a reaction end as a working electrode to construct a screen-printed electrode electrochemical sensor; detecting the peak current change of a cadmium / lead ion solution to be measured by using the screen-printed electrode electrochemical sensor; and calculating the concentration of cadmium ions and lead ions in the cadmium / lead ion solution to be measured by using a linear regression equation of the cadmium ion concentration, the lead ion concentration and the peak current change. The method has the advantages of simple operation, low cost, high detection efficiency, high detection accuracy and the like, can realize on-site detection of cadmium ions and lead ions in water, is convenient to operate, high in accuracy, strong in anti-interference ability to interference factors, and has very important significance for realizing efficient detection of heavy metal cadmium ions and lead ions in a water environment.

This invention discloses a method for preparing a modified straw biochar composite conditioner and its application in the remediation of alkaline cadmium-contaminated soil, belonging to the field of contaminated soil remediation technology. The composite conditioner uses zinc chloride and ferric chloride composite activated straw-based activated carbon as the core functional component, combined with calcium hydroxide and magnesium sulfate heptahydrate, with a specific mass ratio of [missing information]. Using zinc chloride and ferric chloride composite activated straw-based activated carbon as the core, compared to biochar modified with a single activator, the specific surface area and active functional group content are significantly increased, and the complexation and adsorption capacity with cadmium ions is enhanced by more than 60%. It can reduce the available cadmium content in alkaline soil by more than 70%, without secondary pollution. The preparation process of this invention is quantitatively controllable, highly practical, and clearly defines the optimal preparation process parameters for the composite activated straw-based activated carbon. The raw material is agricultural straw waste, which is readily available and inexpensive, and the modification process is simple and industrially scalable.

The utility model discloses a kind of cadmium-inhibiting selenium-increasing conditioner chelation devices, it is related to chelation equipment technical field, the cadmium-inhibiting selenium-increasing conditioner chelation device includes: mixed cylinder subassembly, including first cylinder body and first stirring shaft, first stirring shaft is set to the inside of first cylinder body;Reaction cylinder subassembly, including second cylinder body, heating assembly and second stirring shaft;Stable cylinder subassembly, including third cylinder body, cooling unit, cooling unit is set to the bottom of third cylinder body;Blending bin subassembly, including bin body and third stirring subassembly, bin body is connected with second cylinder body, and third stirring subassembly is rotatably connected with bin body.The utility model is sequentially connected by mixed cylinder subassembly, reaction cylinder subassembly, stable cylinder subassembly and blending bin subassembly, in device, additional blending area of selenium source and cadmium adsorption material, by chelation reaction fixed cadmium ion, simultaneously release active selenium element, satisfy cadmium-inhibiting selenium-increasing, while realizing that cadmium-inhibiting selenium-increasing conditioner has stable product quality of product.

This invention provides a cadmium ion detection reagent, its preparation method, and its application, to solve the problems of cadmium ion detection in the prior art. 2+ Ion detection suffers from high costs, technical complexity, and time consumption, and does not allow for high-throughput analysis. This invention addresses the Cd... 2+ The structure of the ion detection reagent is as follows: ; its preparation method includes the following steps: (1) Add phenanthroline aldehyde and 2-hydroxyacetophenone to a solvent and stir evenly, then add alkali and catalyst, react at room temperature, and then purify to obtain the target product. The cadmium ion detection reagent of the present invention can qualitatively and quantitatively detect cadmium ions, with a detection limit of 2.12 × 10⁻⁶. ‑7 M.

This invention discloses a sintering control process for improving the lead and cadmium leaching rate of ceramic glazes, relating to the field of daily-use ceramic manufacturing technology. The process includes: determining the characteristic dielectric frequency of the glaze to be fired at its critical melting temperature, where the characteristic dielectric frequency corresponds to the frequency of synergistic polarization between lead or cadmium ions and glass network forging ions; heating the product to the critical melting temperature and holding it at that temperature, applying an intermittent pulsed electric field with a frequency equal to the characteristic dielectric frequency; after stopping the electric field, subjecting the glaze melt to temperature cycling treatment, applying periodic temperature fluctuations at a reference temperature; and after the last half-cycle of cooling, rapidly cooling through the glass transition temperature zone, followed by slow cooling to room temperature. This invention, through the synergistic control of characteristic frequency electric field writing, temperature cycling screening, and gradient rapid freezing, significantly reduces the lead and cadmium leaching rate of the glaze surface without changing the glaze formulation, increasing the maximum firing temperature, or extending the production cycle.

The application discloses a structure reversible interconversion type metal framework adsorbing material and a preparation method and application thereof, and belongs to the technical field of adsorbing materials, and comprises the following steps: dissolving anhydrous calcium chloride and 2, 5-pyrazine dicarboxylic acid in a mixed solvent, then adding concentrated nitric acid to perform a heating reaction, continuously activating the obtained solid product at 50-420 DEG C for 24 hours to realize structure conversion, and obtaining the structure reversible interconversion type metal framework adsorbing material. The reversible interconversion type metal framework provided by the application provides a new strategy for the research and development of multifunctional MOFs materials, so that the material can adjust the pore characteristics and three-dimensional space structure according to temperature change, and significantly influences the macroscopic adsorbing performance. The preparation process provided by the application is simple, and provides a new strategy for cadmium ion sewage treatment.