40 results about "Ion concentration polarization" patented technology

The invention provides a parallel seawater desalination device based on ion concentration polarization effect, which includes a main channel and a buffer solution chamber, and the main channel includes a main channel inlet and a main channel outlet. An ion-selective block is arranged in the main channel, and the ion-selective block is made of a cation-selective permeable membrane that only allows cations to pass through. Several parallel micron channels are opened inside the ion-selective block along the axial direction of the main channel. A buffer solution chamber is provided on the outer wall of the main channel, the buffer solution chamber is connected with the ion selective block and allows ions in the ion selective block to enter the buffer solution chamber, and the buffer solution chamber is grounded. Both the entrance of the main passage and the exit of the main passage are connected to a power supply that can adjust the electrode potential, and the potential at the entrance of the main passage is greater than that at the exit of the main passage. The device realizes parallel microchannels by punching holes on the ion selective block, and the number of holes has almost no influence on the desalination efficiency of the system, which is beneficial to industrial application.

The invention provides an ion concentration polarization chip based on a graphene porous membrane and a preparation method of the ion concentration polarization chip and relates to ion concentration polarization chips. The ion concentration polarization chip comprises a glass base, PDMS substrates, a buffer solution water inlet / outlet and a graphene-based porous membrane in a first PDMS substrate, wherein the first PDMS substrate is provided with a Y-shaped groove, and a second PDMS substrate is provided with an I-shaped groove. The preparation method comprises the following steps: preparing graphene-based precursor slurry; producing a chip; and smearing a notch of a Y channel with the graphene-based precursor slurry, and curing, so as to obtain the ion concentration polarization chip. The preparation method has the beneficial effects that the process is simple, and the chip is low in cost and easy to prepare; graphene materials are weakly acidic and have low damage to devices; and the conductivity of the graphene materials is conveniently regulated and controlled, surface functional groups and electric charges are easily regulated and controlled, and the graphene materials can be composited with a large number of materials so as to prepare composite films and devices. Compared with a NaFion-base chip, a relatively stable and relatively large-range exhaustion region can be formed by the graphene-based chip.

Between two juxtaposed similar ion exchange membranes (AEMs or CEMs), an ion depletion zone (dde) and ion enrichment zone (den) are generated under an electric field. As cations are selectively transferred through the CEMs, for example, anions are relocated in order to achieve electro-neutrality, resulting in the concentration drop (increase) in ion depletion (enrichment) zone. The concentration drop (i.e. salt removal) is low and spatially gradual at relatively low voltage or current (i.e. Ohmic regime). However, at higher voltage or current (i.e. overlimiting regime), strong electroconvective vortex accelerates cation transport through CEMs, allowing us to “relocate” most salt ions. The flat depletion zone occurs with significantly low ion concentration, and corresponding strong electric field in the zone, and any charged agents (e.g. proteins and bacteria) cannot penetrate this flat zone. As a result, we can separate and collect the desalted / purified flow from brine flow by bifurcating the channel at the end of the CEMs. This ICP desalination / purification also happens with two anion exchange membranes (AEMs) by relocating cations, but the location of desalted / brine flows are converted.

The invention belongs to the field of lithium extraction equipment in salt lakes, and specifically relates to a lithium extraction device in salt lakes based on ion concentration polarization effect, which includes a main channel, on which first buffer pipes are sequentially arranged for feeding into the main channel. The brine tube for extracting the original solution, the lithium-rich solution cavity tube, and the second buffer tube. The two ends of the main channel are respectively provided with a first outlet and a second outlet. The inside of the main channel is provided with a first anion selective block with several channels. and a second anion selective block. The invention utilizes the locally enhanced electric field in the channel caused by the ion concentration polarization effect to realize lithium ion enrichment and lithium-magnesium separation, the solution flow is driven by the pressure at the inlet and outlet, and high-concentration lithium is collected through the openings on the pipeline solution. Different from the direct parallelization of micro-channels, this device realizes the large-scale parallelism of micro-channels by processing a large number of micro-scale channels on ion-selective materials.

Ion Concentration Polarization (ICP) purification devices and methods for building massively-parallel implementations of the same, said devices being suitable for separation of salts, heavy metals and biological contaminants from source water.

Described are methods for detecting and quantifying biomolecules such as polynucleotides or polypeptides in an electrophoresis matrix using ion concentration polarization and nanoparticle aggregation.

The invention discloses a salt lake lithium extraction device based on the ion concentration difference polarization effect. The device comprises a main channel, a lithium sodium solution cavity and abuffer liquid cavity; an ion selective block is arranged in the middle of the main channel, one or multiple parallel micron channels are formed in the ion selective block in the pipeline direction, the ion selective block is made of a cathode selective permeable membrane material, the cathode selective permeable membrane material has electrical conductivity and only allows negative ions to pass through, however, positive ions and water cannot pass through. The difference of electrophoretic mobility of different positive ions is used for enriching lithium ions on the position closest to the position nearby the ion selective cylindrical block, then, sodions and magnesium ions are selected, and potassium ions are not enriched in the channels. Therefore, micron holes are punched in the frontchannel wall close to the ion selective cylindrical block, enriched lithium ions are drained to the lithium sodium solution cavity, and are guided out to a finished product lithium sodium solution pond from a lithium sodium solution outlet. The characteristic that the concentration of the sodions is obviously larger than the magnesium ions and lithium ions, and the enriching area of the sodions isbetween magnesium and lithium, sufficient separation of the magnesium ions and the lithium ions is achieved.

The invention discloses a lithium ion extraction device based on the ion concentration polarization effect and an extraction method thereof. A horizontal barrier block, a lumen for extracting lithium-rich solution into the main channel, the two ends of the main channel are provided with an inlet and an outlet for the solution to flow in and out of the main channel, a buffer solution chamber is arranged outside the main channel, the main channel and the buffer solution chamber connected by an anion permselective membrane. The patent of the present invention utilizes the difference in electrophoretic mobility of different cations to change the local water flow velocity and local electric field strength by controlling the pressure at the entrance and adjusting the height of the longitudinal and transverse barrier blocks in the main channel, so as to realize the extraction of lithium in the cavity area. Ion enrichment and extraction. The invention provides a stable and efficient method for separating and extracting lithium ions, which can be flexibly used in the industry of extracting lithium from salt lakes.

A water stream is passed between two juxtaposed similar ion exchange membranes (AEMs or CEMs), forming an ion depletion and ion enrichment zones when an electric field is applied. As cations are selectively transferred through the CEMs, for example, anions are relocated in order to achieve electro-neutrality, resulting in the concentration drop (increase) in ion depletion (enrichment) zone. Trifurcation of the output channel allows collection of concentrated, dilute and intermediate streams, with the intermediate stream serving as input to the next stage of a serialized implementation.