tailieunhanh - Investigation of sulfuric acid-treated activated carbon properties

A granulated type of commercial activated carbon (GAC) with surface area of 828 m2/g was treated with a strong solution of sulfuric acid (98% wt.) at a temperature of 30°C. The physicochemical and porous properties and the surface chemistry of the sorbents were investigated and compared in detail. It was established that the lower temperatures of impregnation and the higher concentration of H2SO4 solution resulted in the introduction of higher percentages of sulfur-containing groups and smaller porosity loss. The results of EDS, FTIR, and XPS tests confirmed the introduction of sulfone groups and acidic oxygenated ones, which increased the adsorbent affinity towards mercury species available in the aqueous phase (pH 7) by 20%. |

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