Application of Pvdf Membrane

PVDF is a semi-crystalline polymer with (—CH2—CF2—) repeating units. It has high mechanical strength, good chemical resistance and thermal stability, and excellent aging resistance. Good processing performance. PVDF membranes can be produced by non-solvent induced phase separation (NIPS), thermal induced phase separation (TIPS), steam induced phase separation (VIPS), solution casting, electrospinning and other methods. The stadium shade manufacturer introduces you：

Water treatment and filtration

Water treatment is a main application field of PVDF membrane. About the preparation, characterization and application of PVDF membrane in water treatment processes such as microfiltration (MF), ultrafiltration (UF) and membrane-bioreactor (MBR) There are many reports, and in recent years some membrane manufacturers have also developed a variety of PVDF membrane products for water purification.

Commercial Membrane Structure

Microfiltration (MF)

Generally, MF / membrane can separate particles of about 0.05 ~ 1.0μm, which is a typical method for removing bacteria and an effective way to remove suspended solids to reduce water turbidity. Some researchers have used reverse osmosis technology to prove the feasibility of using PVDF hollow fiber microfiltration membranes for urban sewage treatment, and PVDF microfiltration membranes prepared by TIPS method show good mechanical strength. The water treated by the system has stable quality and low turbidity. Within 15 minutes, the sediment density index and chemical oxygen demand (COD) meet the quality requirements of reverse osmosis supply water. Moreover, membrane permeability can be restored by refluxing with low concentration chlorine.

Ultrafiltration (UF)

The pore size range of UF membrane is 0.01 ~ 0.1μm, which is commonly used to remove viruses, emulsified fatty oil, metal oxides, colloids, proteins and other large molecular weight materials from water and other solutions. The researchers used a commercial PVDF ultrafiltration membrane with a molecular weight cut-off (MWCO) of 100KD to treat the fermentation broth of methyl-chlortetracycline;

Membrane-bioreactor (MBR)

MBR combines traditional biological wastewater treatment with membrane separation and replaces traditional activated sludge treatment with secondary precipitation. The type of membrane used depends on the size of the pollutants that are exposed to the treatment process. The membranes used in MBR are basically typical ultrafiltration or microfiltration membranes. The researchers used MBR technology to use commercial PVDF ultrafiltration membranes to treat printing and dyeing wastewater, and the results showed superior performance than other biological treatment methods.

Recycling biofuel

In recent years, the increasing energy crisis has promoted the development of renewable energy alternative fossil fuel technologies. Biofuels such as bioethanol represent the most successful renewable energy and have attracted the attention of many countries in the world. Recently, pervaporation is considered as a viable method for separating and recovering ethanol from fermentation broth. So far, the most successful case is the use of polydimethylsiloxane (PDMS) as a raw material membrane, in the solution diffusion model to achieve the purpose of recovering ethanol, and PVDF membranes mostly act as PDMS carriers in this process.

Composite membrane preparation

In addition to separation applications, PVDF membranes can also be used as scaffolds or carriers to prepare composite membranes. At present, most polyamide composite films (TFC) are prepared with PSF as a carrier because of their relatively high hydrophilicity, which is suitable for interfacial polymerization of polyamide in aqueous solution. However, the low mechanical strength of PSF and poor resistance to some organic substances such as aromatic hydrocarbons, ketones, ethers and esters limit the application field of the prepared composite membrane. PVDF membranes used as scaffolds or carriers to prepare composite membranes may have a broad range Application prospects.