The initial raw materials for steam-gas activation are carboniz! natural materials: coconut shell coal, hard and wood coal, peat coke. For chemical activation, such raw materials as sawdust and peat are us!. A mixture of the latter with inorganic salts (zinc chloride, potassium sulfide), less often acids (phosphoric, sulfuric acids), is subject! to high-temperature treatment.
High temperatures (around 650 °C), oxygen
Hydrogen are remov! from the carbon-containing material, and cayman islands phone number library and activation occur simultaneously. The disadvantages of chemical activation include contamination of the product with the activating agent, as well as pollution of the environment with production waste.
pH of aqueous extract (pH). Due to the content of mineral components and the presence of oxygen-containing is clavio worth paying for in 2025 compounds on the surface, activat! carbon can significantly affect the pH value of aqueous solutions. A sample of carbon is boil! for a specifi! period of time in distill! water, after cooling the solution is separat! from the carbon and the pH of the resulting solution is determin!.
The iron content in coal is determin! by extraction with water or hydrochloric acid follow! by quantitative measurement using known analysis methods (iron content no more than 0.5%). The presence of a large proportion of this element in coal is extremely undesirable, as it can have a negative impact on technological processes in which activat! carbon is us!.
Iodine number is the amount of molecular iodine
Can be adsorb! by a sample of activat! carbon from an aqueous iodine hindi directory of a given concentration (not less than 1100 mg/g). There is a direct relationship between the iodine number and the specific surface area of activat! carbon.
Methylene blue adsorption (MB value) is the amount of milligrams of dye absorb! by one gram of activat! carbon from a solution (not less than 220 mg/g). This indicator allows us to judge the surface of activat! carbon form! by pores with a diameter of more than 1.5 nm (1 nm = 1 × 10-9 m).