m, rhodium, etc. Activated graphite electrode for arc furnace is an invisible air filter. Transition hole: Radius 20-1000 A.8cm3 / g Residual chlorine adsorption rate ≥ 85% Filling density 0. Wood activated carbons generally have the largest pore radius. In the endothermic reaction, a mixed gas composed of CO and H2 is mainly generated to burn and heat the carbide to an appropriate temperature (800 To 1000 ° C) to burn away all the decomposable substances, resulting in a developed microporous structure and a huge specific surface area, so it has a strong adsorption capacity. In coal-based activated carbon,
The larger the specific surface area, the better the adsorption performance. Activated carbon for water treatment requires transitional pores (radius 20 ~ 1000A) to be developed, which is conducive to the diffusion of adsorbate into the pores. The advantages are that the pore structure is developed, the specific surface area is large, the adsorption performance is strong, the reservoir layer has a small negative force, the chemical properties are stable, and it is easy to regenerate. The adsorption capacity of activated carbon is subject to other external conditions, and is mainly related to the specific surface area of activated carbon
lignite activated carbon has more transitional pores and a larger average pore diameter than anthracite activated carbon, so it can effectively remove large molecular organic matter in water. Activated carbon will have excellent development prospects and a broad sales market in the future. Please refer to the national standard (GB / T 19587-2004)-BET principle of gas adsorption. Among them, coal and coconut shell have become the most commonly used raw materials for the manufacture of activated carbon. Some commercially available activated carbons available in Japan have the following characteristics: specific surface area is 850 to 1000 m2 / g, pore volume is 0. At present, the specific surface area test at home and abroad uses the multi-point BET method.
The second process is to activate the carbide, which is completed by reacting activator such as water vapor with char. Large hole: radius 1000-1000000 A. Activated carbon is a combination of physical adsorption and chemical decomposition. The first type of granular activated carbon used in the field of urban water treatment is made of wood, called charcoal.
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