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Plasma equipment cleaning machine plasma treatment PMMA/MMT composite micron fiber for immobilization of laccase

Keywords:

plasma,treatment

Published on:

05 Sep,2021

Plasma equipment cleaning machine plasma treatment PMMA/MMT composite micron fiber for immobilization of laccase:
Laccase is a kind of copper oxide, which promotes the oxidation of various aromatic materials while reducing oxygen in the solution. The specificity of laccase and its ability to degrade many pollutants indicate that it has great potential in the field of sewage treatment and bioremediation. Fixing laccase on a water-insoluble substrate can improve its stability and can be reused.
Electrospinning is a novel and universally applicable method for preparing nano or micro fibers. The ultra-high specific surface area and porosity of nanofibers make microfibers an ideal material for enzyme immobilization substrates.
The surface of electrospun PMMA micron fibers has a microporous structure, which further increases the specific surface area of ​​the micron fibers. Montmorillonite (MMT) is one of the silicate minerals. It has a unique layered one-dimensional nanostructure. Each unit cell consists of two silicon-oxygen tetrahedral layers and aluminum ( Magnesium) oxygen (hydrogen and oxygen) octahedron structure.

plasma treatmentThe thickness of each layer is about 1nm, has a large specific surface area and a diameter-to-thickness ratio of up to 20, and has high rigidity, and it is not easy to slide between layers.
The upper and lower surfaces of montmorillonite are all oxygen atoms, and the layers are only combined by van der Waals forces, so the connection force is very weak. Therefore, water or other polar molecules can easily enter the interlayers, causing the layer bonds to break, and the layer spacing Increase, resulting in directional expansion of the crystal lattice. Therefore, montmorillonite is an expansive clay mineral, and its swelling degree is related to the types of exchangeable cations.
DMMA/MMT composite micron fiber is prepared by high-voltage electrostatic spinning method, and its surface is treated with plasma equipment cleaning machine plasma technology to improve the immobilization rate of laccase.
Micropores are evenly distributed on the surface of the original fiber. This micropore has a certain effect on the adsorption of laccase. The micropores on the surface become blurred after the original laccase is adsorbed. This may be because the immobilized laccase will affect the surface The micropores are covered.
After plasma treatment with a plasma equipment cleaner, the micropores on the fiber surface become larger and free oxygen groups are now available, which makes the fiber surface easy to combine with water molecules and improves the hydrophilicity of the fiber surface. The fiber after plasma treatment by the plasma equipment cleaner has greatly increased the adsorption of laccase. This is because the hydrophilicity of the fiber surface is increased, which is beneficial to the combination of laccase and the fiber.
The electrospun PMMA/MMT composite micron fiber was successfully used for the adsorption of laccase after plasma treatment. The plasma treatment of the plasma equipment cleaning machine greatly improves the hydrophilicity of the fiber, thereby promoting the adsorption of laccase. Infrared analysis showed that laccase formed a chemical bond with MMT in the fiber.

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