The activated carbon (AC) was chemically modified by K₂CO₃, and the specific surface area, pore volume and pore size of the AC after modification were investigated. As the mass ratio of K₂CO₃ to AC (alkali-carbon ratio) increased, the specific surface area of the modified AC shows a trend of increasing first and then decreasing. When the ratio of alkali to carbon was 6, the specific surface area of the modified AC increased from the initial 653.3m²/g to 1333.6m²/g. The modified AC was then used as the support to prepare an adsorption catalyst for arsenic removal, which exhibits excellent arsenic adsorption owing to the multi-level pore channels composed of micropore-mesopores. The micropore ensured the catalyst with a large specific surface area, so the active components can be efficiently dispersed on it, while the mesopore allowed the macromolecular arsenide to fully contact and react with the active metal components, and thus improved arsenic removal efficiency.

Activated Carbon, Modification by Potassium Carbonate (K₂CO₃), Adsorption, Support, Catalyst