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Sorption of Metaldehyde using granular activated carbon

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Acetaldehyde (C8 H16 O4), a highly polar organic compound and a cyclic tetramer of aldehydes (CH3 CHO), is the active ingredient in 80% of insect repellents and has been widely used in agriculture and horticulture. At 20°C, the solubility of polyacetaldehyde in water is 0.188g L-1. Its frequent release and persistence in water bodies has polluted surface water resources and remains in drinking water. Therefore, it is of great significance to remove metaldehyde from water.


Activated carbon adsorption and oxidation processes (AOPs) are common treatment methods for removing pesticides from water. Activated carbon is a commonly used adsorbent for treating pollutants in water. It is affordable and effective. For example, activated carbon is very effective at filtering pollutants from water and air. However, it is less effective in removing polyacetaldehyde in water treatment plants due to the physicochemical properties of polyacetaldehyde, such as its low octanol/water partition coefficient. Oxidation is a trending treatment method that typically involves ultraviolet radiation and catalysts to break down organic contaminants into benign substances such as water and carbon dioxide.


The powdered activated carbon we now use for water treatment has the ability to remove polyacetaldehyde from water compared to nanoparticle photocatalysis. Due to the effective results of using activated carbon as an adsorbent, it is worthwhile to further investigate the adsorption mechanism of acetaldehyde on activated carbon. Regarding the adsorption process of pollutants such as polyacetaldehyde in water, it is necessary to consider background organic matter. The interaction between pollutants and dissolved organic matter (DOM) has important implications for environmental and water treatment processes. For example, NOM molecules can block the active sites of catalysts and subsequently inhibit the degradation process of polyacetaldehyde, reducing the removal efficiency of acetaldehyde by electrochemical processes involving new adsorbents. Therefore, the background concentration of organic matter can affect the adsorption of polyacetaldehyde by activated carbon.


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