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What are the applications of coconut shell activated carbon in the treatment of heavy metals? The heavy metal mercury is a major pollutant in the flue gases from coal-fired power plants. The average mercury content in coal in our country is 0.15 mg/kg. Although the mercury concentration in flue gas is low, power plants burn large amounts of coal, resulting in high total mercury emissions. The emission of the heavy metal mercury causes severe damage to the environment. Mercury in the environment can be converted into organic forms by microorganisms (such as methylmercury), and it can be bioaccumulated before entering the human body through the food chain. It is a major threat to human health. The morphological distribution of mercury in coal directly affects the toxicity and emissions of mercury in flue gas. There are three forms of mercury in coal combustion. Elemental mercury HGP, divalent mercury HGP, and particulate mercury HgP – HgP is the main form of mercury in flue gas. Divalent mercury HGP is stable and easily adsorbed; at high concentrations it is removed in the form of sulfides. Particulate mercury HGP can be easily adsorbed due to its charge, and can be removed using electrostatic precipitators. In recent years, scholars at home and abroad have conducted a series of studies on coal-fired mercury removal technologies in power plants. Currently, there are mainly two methods for removing mercury from adsorbents using conventional approaches. Among them, the mercury removal technique using adsorption methods has a high mercury removal efficiency. Its user-friendly features and other advantages have led to its widespread use. This article discusses the application of adsorption methods in mercury removal technology. Research progress in mercury removal by adsorption plays a decisive role in the mercury adsorption process. Based on the current research status at home and abroad, most studies focus on the development of efficient and cost-effective adsorbents. Currently, there are several types of adsorbents for mercury removal from flue gas. Activated carbon adsorption is a relatively advanced and widely applied technology. There are two ways to remove mercury. One method is to use activated carbon to absorb smoke, while the other is to spray activated carbon into the flue gas. The latter is more mature and has a wider range of applications. Activated carbon is primarily exposed to mercury in flue gas; after a series of physical and chemical adsorption processes, it is collected by dust removal devices. In terms of wastewater treatment, DeLong recommends using coconut shell activated carbon to remove color and odors from wastewater. DeLong coconut shell activated carbon is made from high-quality coconut shells from Southeast Asia, using advanced production techniques. It undergoes carbonization, activation, and purification processes. Coconut shell activated carbon is a black amorphous particle that contains no harmful substances and is odorless. It features a well-developed pore structure, a large specific surface area, strong adsorption capacity, and high strength. Long service life and a wide range of options.