32 results about "Electrochemical adsorption" patented technology

The invention relates to an MXene-based three-dimensional porous flexible self-supporting membrane, a preparation method thereof and an application of the membrane in electrochemical adsorption of dyes. The preparation method of the self-supporting membrane comprises the following steps that an MXene nanosheet suspension, a polystyrene microsphere suspension and a single-walled carbon nanotube suspension are mixed and stirred to be uniform, an obtained mixed solution is subjected to ultrasonic treatment, then vacuum filtration is conducted, so that an MXene/PS/SWCNTs composite film is obtained, and then, the polystyrene microsphere template is removed, so that the MXene-based three-dimensional porous flexible self-supporting membrane can be obtained. The self-supporting membrane obtained in the invention has a large pore volume and a high specific surface area, and can expose more active sites. The prepared self-supporting membrane is used for removing dye through electrochemical adsorption and has the advantages of being high in removal efficiency, easy to recycle, low in cost, easy to control and the like.

The invention provides an electrochemical adsorption treatment device and process for water-based waste drilling fluid. The electrochemical adsorption treatment device for the water-based waste drilling fluid comprises a mud tank, a mud pump, a flow meter, an electrolytic bath, an electrode and an automatic control system, wherein the mud tank is circularly communicated with the mud pump; the mud pump is communicated with the flow meter; the mud tank is communicated with the flow meter; the flow meter is communicated with the electrolytic bath; the electrode comprise an anode and a cathode; the electrode is arranged in the electrolytic bath; the automatic control system is electrically connected with the electrode; the automatic control system is electrically connected with the flow meter. According to the electrochemical adsorption treatment device and process for the water-based waste drilling fluid, which are provided by the invention, a chemical treating agent is not added; an effective component in drilling fluid is not destroyed; inferior solid phases of a superfine micro-particle and the like in waste drilling fluid can be effectively removed; thus, main performance indexes of the density, the silt content, the solid content and the like of the waste drilling fluid are decreased; the rheological characteristic of the waste drilling fluid is improved, and the recycling performance index requirement of waste-based drilling fluid is met.

A mesoporous, nanocrystalline, metal oxide construct particularly suited for capacitive energy storage that has an architecture with short diffusion path lengths and large surface areas and a method for production are provided. Energy density is substantially increased without compromising the capacitive charge storage kinetics and electrode demonstrates long term cycling stability. Charge storage devices with electrodes using the construct can use three different charge storage mechanisms immersed in an electrolyte: (1) cations can be stored in a thin double layer at the electrode/electrolyte interface (non-faradaic mechanism); (2) cations can interact with the bulk of an electroactive material which then undergoes a redox reaction or phase change, as in conventional batteries (faradaic mechanism); or (3) cations can electrochemically adsorb onto the surface of a material through charge transfer processes (faradaic mechanism).

The invention provides equipment and a treatment method for treating dye wastewater by an electrochemical-adsorption process. Main electrode plates of a reactor include a metal copper palladium-loaded graphite plate cathode and a ruthenium titanium tin coated titanium anode, and a space between the main electrode plates is filled with anhydrous NaCl and powdered active carbon. The equipment is high in current conductivity and easy to operate, and can efficiently remove COD from dye wastewater and decolorize the dye wastewater; by the treatment method, the chroma of the dye wastewater can be effectively reduced; and the treatment method is applied to treatment to the dye wastewater with medium and low concentrations.

The invention discloses a manganese dioxide-melamine formaldehyde resin double-shell composite phase-change material, which is prepared by the following steps: preparing melamine-formaldehyde resin microcapsules by using an oxidation-reduction method and an electrochemical adsorption method, and constructing MnO2 nano layers on the surfaces of the microcapsules to form a double-shell spherical structure, wherein the microcapsules are negatively charged through surface modification, the MnO2 nano layer is further constructed through an oxidation-reduction reaction, and the microstructure of theMnO2 nano layer is composed of nano particles and nano wires. The preparation method comprises the following steps: 1) pretreating raw materials;2) preparing microcapsules; and 3) preparing a MnO2 shell layer. According to the invention, the photo-thermal conversion efficiency of the phase change material is 93-99%, the phase change temperature is 10-29 DEG C, and the phase change latent heat is116-169 J/g; and the phase change material has the advantages that the problem of leakage in the phase change process is effectively solved, the photo-thermal conversion efficiency is high, and the phase change latent heat and the thermal stability are high.

The invention discloses a preparation method and application of modified magnesium lithium silicate, and the preparation method comprises the following steps: taking a beryllium-containing substance, a magnesium salt, a lithium salt, silica sol and the like as raw materials, and carrying out high-temperature hydrothermal reaction to prepare magnesium lithium silicate; the number of charges of the crystal lattice structure is large, and the mycotoxins with small polarity such as zearalenone and vomitoxin can be effectively adsorbed in an electrochemical adsorption mode, so that the application prospect in the industry of preventing and treating the mycotoxins by feed is extremely wide.

In alternative aspects, the invention provides processes for cyclic electrochemical adsorption of aqueous contaminants using nanocomposites of graphene with tin oxide or antimony doped tin oxide.

The invention belongs to the field of uranium ore resource prospection, and concretely provides a preparation method for an electro-geochemical adsorption material for uranium exploration. The preparation method comprises dipping in a nitric acid solution to remove background content of uranium element in polyurethane foam plastic, loading with an organic extraction agent possessing adsorption efficiency, and other steps. In the background-removed polyurethane foam plastic obtained through the preparation method, the background content of uranium element is effectively reduced, therefore influence of the background content of the polyurethane foam plastic on an analysis measurement result is reduced, and further the analysis measurement result is relatively accurate. Meanwhile, the background-removed polyurethane foam plastic is loaded with a proper organic extraction agent, the adsorption capability of the background-removed polyurethane foam plastic during electro-geochemical extraction is improved, and extraction efficiency of active-state uranium element is enhanced.

The invention discloses a method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater, and relates to a method for recovering lead ions from heavy metal wastewater.The invention aims to solve the technical problems of difficulty in targeted recovery of heavy metals from complex water environments and low recovery purity caused by poor selectivity of existing adsorbents. A tannic acid@graphene oxide conductive aerogel material is applied to a water body heavy metal electrochemical adsorption system as a conductive adsorbent, and under the action of an electric field, the adsorption selectivity of the tannic acid@graphene oxide conductive aerogel material to Pb<2+> is enhanced. According to the method disclosed by the invention, the conductive layer of thetannic acid@graphene oxide conductive aerogel material can be optimized through electrochemical reduction, so that the material has better conductivity, and has better selectivity to lead ions underthe action of an electric field. The method is applied to recovery of lead from metal wastewater.