Technology

Basic Characteristics of Triporous

Triporous
Conventional Activated Carbon
Triporous
Enlarged Image of Triporous SEM photographs taken by Toshiyuki Yokoi Laboratory of Tokyo Institute of Technology
Conventional Activated Carbon
Enlarged Image of Conventional Activated Carbon SEM photographs taken by Toshiyuki Yokoi Laboratory of Tokyo Institute of Technology
Enlarged Image of Triporous
Enlarged Image of Conventional Activated Carbon
SEM photographs taken by Toshiyuki Yokoi Laboratory of Tokyo Institute of Technology

Triporous contains a mix of 2-nm micropores, 2 to 50-nm mesopores, and 1-μm macropores, all in enormous quantities. In contrast, conventional activated carbon is essentially made up of many micropores. For this reason, Triporous easily adsorbs large substances, such as high-molecular-weight organic compounds and viruses, which are difficult to adsorb with conventional activated carbon. Compared to activated carbon, Triporous also boasts superior adsorption speed and higher chemical agent carrying capacity.

[A unique porous structure, created in a manufacturing process developed by Sony]

manufacturing process of Triporous manufacturing process of Triporous

[A unique porous structure, created in a manufacturing process developed by Sony]

The first step in making Triporous is to carbonize the rice husks by clearing the large amount of silica accumulated between the cells of the husks. Next, the silica is “etched” (eliminated) to form large macropores, and then mesopores and micropores are developed in an activation process (high-temperature process that uses water vapor). The result of this manufacturing process, developed by Sony, is Triporous, a material with a unique porous structure, featuring a mix of macropores, mesopores, and micropores. Sony has acquired numerous and various patents relating to Triporous materials and applied technologies.

Quick Adsorption

Compared to activated carbon*1
six times faster adsorption*2 of the ammonia gas
responsible for body and pet odors

Triporous
Conventional Activated Carbon
Triporous
Conventional Activated Carbon

Conventional activated carbon has a low volume of macropores, so it is difficult for substances to pass through it, and adsorption consequently requires considerable time. On the other hand, the large macropores and mesopores in Triporous serve as pathways for substances, and intraparticle diffusion is fast, enabling high-speed adsorption. For example, one assessment of adsorption speed for ammonia, the gas responsible for body and pet odors, found that Triporous adsorbs odors approximately six times faster than conventional activated carbon. Adsorption is fast in the liquid phase too, so in a water purifier filter, Triporous has the potential to remove impurities very rapidly.

*1 Activated carbon made from coconut shell. *2 Comparison based on equal mass.
Comparison of adsorption volume per unit of ammonia gas for Triporous and coconuts shell based activated carbon A comparison of the adsorption volume per unit mass of ammonia shows that Triporous deodorizes very effectively in a short time—approximately six times better than activated carbon.
Comparison of adsorption volume per unit of methylene blue for Triporous and coconuts shell based activated carbon Even for adsorption of a pigment (methylene blue) in aqueous solution, Triporous adsorbs approximately twice as fast as activated carbon.

Adsorbs Organic Substances of Various Sizes

Adsorbs over twice as much high-molecular weight
organic pigments and 3 to 8 times more allergens
than conventional activated carbon*.
Also eliminates more than 99% of viruses and bacteria

Triporous
Conventional Activated Carbon
Triporous
Conventional Activated Carbon

Since Triporous is composed of a mix of 2-nm micropores, 2 to 50-nm mesopores, and 1-µm macropores, it is capable of adsorbing large quantities of organic substances of various size. For example, when compared to activated carbon, it adsorbs about twice as much high-molecular weight organic compounds, which tend to be a problem in industrial wastewater treatment. It is also far more effective than activated carbon in dealing with allergens that are difficult to adsorb with conventional activated carbon, achieving approximately three times greater adsorption with cedar allergens and approximately eight times greater adsorption with dog and cat allergens. Moreover, Triporous eliminates over 99% of viruses and bacteria, so it has the potential to make a substantial contribution to the water purification systems of emerging countries and to water recycling systems in arid regions.

* Activated carbon made from coconut shell
Adsorption of large molecular weight dye (Black 5) Triporous is approximately twice as adsorptive as activated carbon based on adsorption per gram of a high-molecular-weight pigment (Black5).
Adsorption of cat allergen (fel d 1) Triporous is approximately eight times more effective than activated carbon in adsorbing cat allergens. (measured by Institute of Tokyo Environmental Allergen, Test No:T1706032 )
Adsorption of feline calicivirus Whereas activated carbon is almost completely ineffective against feline calicivirus, Triporous eliminates more than 99% of the virus. (measured by Bio medical science association, Test No: BMR27-14)

Large Volume of Impregnation Reagent

More than twice the service life of activated carbon
when used in air purifiers and for industrial filters

Triporous
Conventional Activated Carbon
Triporous
Conventional Activated Carbon

The large volume of tiny cavities in the macropores and mesopores of Triporous give it a high water retention rate. This means that it can be impregnated with more of a chemical agent or catalyst than conventional activated carbon. Currently, industrial filters, household air purifiers, and similar devices are made using activated carbon impregnated with a particular chemical agent, depending on the application. Since Triporous contains a large volume of tiny cavities in its macropores and mesopores, and can therefore be impregnated with a greater amount of chemical agent than conventional activated carbon, Triporous filters can be made to last more than twice as long as activated carbon-based filters.

Comparison of water retention rate: Triporous vs. activated carbon Triporous has more than twice the water retention rate of activated carbon.
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