Abstract
A coconut-shell-based activated carbon (AC) was oxidized by hydrogen preoxide solution to introduce oxygen-containing groups on the surface of AC (AC-HP). The concentration of the oxygen-containing groups was determined by the Boehm’s method. The AC with highly dispersed zinc(II) oxide (AC-ZnO) or iron(II)iron(III) oxide (AC-Fe3O4) were also prepared by impregnation method. X-ray diffraction and TEM observation showed the formation of finely dispersed metal oxides on AC-ZnO and AC-Fe3O4. Adsorption features of H2S on these AC samples were characterized by flow adsorption technique. Remarkable difference in the adsorption capacity wasn’t observed in AC and AC-HP. On the other hand, the H2S adsorption activity was significantly increased in AC-ZnO and AC-Fe3O4. The breakthrough curves of H2S on these AC samples indicate that AC-ZnO is the most promising candidate for the adsorbent of H2S.
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