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The mechanism of activated carbon treatment with chromium-containing wastewater byX-ray photoelectron spectroscopy (XPS) and that of adsorption and reduction reaction of the acti-vated carbon with hexavalent chromium solution are presented in this paper. The XPS results showthat at PH<1,the activated carbon does not adsorb any chromium ion,and the main reaction is re-duction process of Cr(VI), at 1
