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Diatom mud is heating up in China market, and its biggest highlight is that it can decompose formaldehyde. But after checking some data, diatom mud can only be adsorbed. The reason why diatom mud can decompose formaldehyde is because photocatalyst is added to diatom mud, which plays a catalytic role under strong light and decomposes formaldehyde adsorbed on diatom mud. Another is adding tetrapod-like zinc oxide whiskers, which can decompose formaldehyde adsorbed on the surface of diatom mud through its own strong oxidation without light as an auxiliary condition. Quadruped zinc oxide whiskers are also used as oxygen supply for astronauts in space activities. At present, only one brand of diatom mud in China owns the patent of tetrapod-like zinc oxide whisker-Smilia diatom mud. Combining these two points, diatom mud really has adsorption and decomposition!