Study on the effect of modified activated carbon on adsorption characteristics of nitrobenzene in water
Taking briquette-activated carbon as the research object,the effects of modification with nitric acid,concentrated sulfuric acid,hydrofluoric acid and ammonia water on the surface functional groups and elemental components of activated carbon,and the changes of adsorption properties of activated carbon to selected pollutants before and after modification were studied respectively.The results showed that the adsorption capacity of nitrobenzene on activated carbon modified by ammonia,hydrofluoric acid and sulfuric acid was similar,and its adsorption capacity was slightly improved compared with that of unmodified activated carbon under the same equilibrium concentration.However,the adsorption performance of activated carbon decreased obviously after modification with concentrated nitric acid,especially after modification with concentrated nitric acid.Therefore,the adsorption of organic matter by activated carbon was mainly van der Waals force,and the adsorption capacity of activated carbon for nitrobenzene and other organic pollutants could not be increased by increasing surface functional groups.
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维普
