Diatomite is used as a filter aid for activated carbon filtration and decolorization
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I have the original substance, which is black in color. I used activated carbon to raise the temperature to reflux level and stirred for an hour to remove the color, but the result was not very satisfactory; then I added some diatomaceous earth to aid in filtration. During the filtration process, it was found that when activated carbon was filtered without the use of diatomaceous earth, about 95% of the filtrate could be collected, but the results were far from satisfactory ； Adding diatomite as a filter aid and then performing vacuum filtration gave slightly better results, but only about 50% of the filtrate could be collected ； Why is this?
Have you tried other methods? You might want to look into resin decolorization; I hope it can help solve your problem.
Fifty percent, where did the rest go? ? ?
Principle of decolorization by macroporous resins； Pigments generally exist in the form of organic acids; therefore, from the perspective of exchange mechanisms, decolorization resins are typically divided into two categories: ion exchange resins and macroporous adsorption resins. Ion-exchange resins achieve decolorization through ion exchange, while macroporous adsorption resins achieve decolorization through adsorption based on their specific surface area, pore volume, and pore size. For example, in the decolorization of starch sugars via ion exchange, D354FD large-pore weakly basic resin is used for decolorization; subsequently, SD300 can be employed to carry out further purification and decolorization as well as to remove impurities and unwanted odors. Large-pore strong-base anion resins can also be chosen for decolorization. Adsorption principle of macroporous resins: Macroporous adsorption resins are formed by using styrene and propionate esters as monomers, styrene-divinylbenzene as a crosslinking agent, and toluene and xylene as pore-forming agents; these components crosslink and polymerize with each other to create a porous skeletal structure. Resin is generally white spherical particles with a particle size of 20–60 mesh; it is a type of cross-linked polymer containing ion-exchange groups. Its physical and chemical properties are stable – it is insoluble in acids, bases, and organic solvents, and it is not affected by inorganic salts or strong ionic small-molecule compounds. Resin adsorption relies on the van der Waals forces between it and the molecules to be adsorbed (adsorbates), and it operates through its enormous specific surface area for physical adsorption. This allows organic compounds to be separated, purified, decontaminated, concentrated, and achieved other similar objectives, depending on their adsorbability and molecular weight, through extraction using appropriate solvents
It’s probably been absorbed by diatomaceous earth.
Diatomaceous earth absorbs a large amount of moisture; if the volume of the filtrate is small, the losses are significant. It is possible to consider mixing diatomaceous earth and activated carbon with the material solution, and filtering multiple times to compact the filter cake. Additionally, you can try heating with hydrogen peroxide for bleaching and decolorization.
Hello, I am a manufacturer of activated carbon, diatomaceous earth, and cardboard filter elements. I’m from Hangzhou Kobait, phone number: 17367118637. We can discuss this further
What is the temperature for reflux with activated carbon? Diatomaceous earth will inevitably adsorb some of the liquid mixture; it is possible to spread diatomaceous earth on filter paper and use vacuum filtration. By ensuring an appropriate filtration rate, it can be reused.
Is it a test involving heating and reflux with activated carbon? Is it adsorption or evaporation-reflux? Diatomaceous earth absorbs water, but the loss is not as significant; check whether the sample is correct