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What are the characteristics of a photocatalytic filter?

Release Date:

2021-03-26

What are the characteristics of photocatalytic filter media? By material: cotton-based photocatalytic filter media, aluminum-based photocatalytic filter media, nickel-based photocatalytic filter media, and nonwoven fabric photocatalytic filter media. By shape: porous composite sponge photocatalytic purification media, hexagonal aluminum honeycomb photocatalytic purification media, and porous structured metal photocatalytic purification media, among others. By manufacturing process: aluminum-frame photocatalytic filter media, paper-box photocatalytic filter media, and composite photocatalytic filter media. With so many classifications, it’s a bit underwhelming.

By material: cotton-based photocatalytic filter media, aluminum-based photocatalytic filter media, nickel-based photocatalytic filter media, and nonwoven fabric photocatalytic filter media.

Based on their physical configuration, these include porous composite sponge photocatalytic purification meshes, hexagonal aluminum honeycomb photocatalytic purification meshes, and porous-structured metal photocatalytic purification meshes, among others.

In terms of manufacturing processes: aluminum-frame photocatalytic filters, cardboard-frame photocatalytic filters, composite photocatalytic filters, and so on. With so many categories, it’s a bit underwhelming.

Let’s take a look at what a photocatalytic filter is.

Photocatalysts are a general term for photo-semiconductor materials, with nano-sized titanium dioxide as the representative. When applied to a substrate surface and exposed to ultraviolet light, they undergo a photocatalytic reaction—similar to photosynthesis—generating highly oxidizing free radicals and reactive oxygen species, thereby exhibiting powerful catalytic decomposition capabilities. Photocatalysts that can effectively decompose toxic and harmful gases in the air possess robust photo-oxidation–reduction functions: they can oxidize and break down various organic compounds as well as certain inorganic substances, ultimately converting organic pollutants into non-polluting water (H₂O) and carbon dioxide (CO₂). This enables applications such as formaldehyde removal, deodorization, mold prevention, and scale inhibition.

The primary constituent of the aforementioned photocatalyst is nano-sized titanium dioxide, which can be synthesized via precipitation, sol–gel, W/O microemulsion, or vapor-phase reaction methods; however, these synthesis techniques will not be described in detail here.

Photocatalysis is characterized by the use of oxygen and water molecules in the air to convert contacted organic substances into carbon dioxide and water. The photocatalyst itself remains unchanged, but it acts as a catalyst that accelerates the chemical reaction. It has a long theoretical service life and low maintenance costs. Moreover, titanium dioxide is non-toxic and harmless, making it widely used in food, pharmaceuticals, and other fields.

In the field of air purification technology, photocatalytic filters can effectively remove toxic chemical pollutants that pose health risks to human society, including formaldehyde, benzene-series compounds, volatile organic compounds, ammonia, sulfur dioxide, carbon dioxide, nitrogen oxides, and exhaust emissions from the automotive industry. Through photocatalytic oxidation, these organic compounds are decomposed into carbon dioxide and water, thereby purifying ambient air.

The foregoing has outlined the key characteristics of photocatalytic filter media, which are categorized based on material, shape, and manufacturing process. We hope this information proves helpful; should you have any further questions, please feel free to contact us.

Keywords:

Filter mesh, filtration, photocatalytic filter mesh

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What are the characteristics of a photocatalytic filter?