Common questions What is NEOSEPTA?



ASTOM > Ion exchange membrane[NEOSEPTA] Site map. HOME > Products >Ion exchange membrane[NEOSEPTA] Ion exchange membranes have ionic permselectivity and are classified into cation exchange membranes and anion exchange membranes.

How does a cation exchange membrane work?

Basically, cation exchange membranes perform as a separator and solid electrolyte in a variety of electrochemical cells that require the membrane to selectively transport cations across the cell junction. The polymer is chemically resistant and durable.

What is bipolar electrodialysis?

Electrodialysis with bipolar membranes (EDBM) is a kind of technology that integrates solvent and salt dissociation. It can realize salt conversion without second salt pollution or provide H+ and OH-/alkoxide ions in situ without salt introduction. Thus, it inherently possesses economical and environmental benefits.

What is Nafion used for?

Nafion has found use in fuel cells, electrochemical devices, chlor-alkali production, metal-ion recovery, water electrolysis, plating, surface treatment of metals, batteries, sensors, Donnan dialysis cells, drug release, gas drying or humidifaction, and superacid catalysis for the production of fine chemicals.

What is a PEM made of?

A proton-exchange membrane, or polymer-electrolyte membrane (PEM), is a semipermeable membrane generally made from ionomers and designed to conduct protons while acting as an electronic insulator and reactant barrier, e.g. to oxygen and hydrogen gas.

How does a bipolar membrane work?

The bipolar membranes enhance the splitting of water into protons and hydroxide ions. Bipolar membranes are a special type of layered ion exchange (IX) membrane where the two polymer layers one is only permeable for the anions and the other only for cations.

What is electrodialysis in water treatment?

Electrodialysis is an electrochemical process in which ion transfer separates salt from water. In electrodialysis, filters or membranes selectively impervious to cations or anions are placed alternately between the electrodes (Figure 35).

Who invented Nafion?

Nafion was invented by Walther Grot in the late 1960s(1) and first commercialized as a membrane separator for chlor-alkali cells. During the 1990s, extrusion-cast Nafion membranes were used for a variety of fuel cells and other electrochemical applications.

Is Nafion toxic?

The perfluorosulfonic acid copolymers used in Nafion® membranes exhibit very low acute toxicity when administered in oral doses to rats. The LD50s are greater than 20,000 mg/kg of body weight.

Who Has Lowest cation exchange capacity?

Sand has no capacity to exchange cations because it has no electrical charge. This means sandy soils such as podzolic topsoils have very low CEC, but this can be improved by adding organic matter.

What is a good CEC number?

Organic matter has a very high CEC ranging from 250 to 400 meq/100 g (Moore 1998). Because a higher CEC usually indicates more clay and organic matter is present in the soil, high CEC soils generally have greater water holding capacity than low CEC soils.