Characteristics of adsorption of arsenic by red soil from sandstone weathering

Treatment of arsenic in drinking water has been a difficult problem, especially in the countryside, because of its high cost and inconvenience. Red soil has a relatively high clay minerals and iron and aluminum compounds and must be a natural material to solve this problem. Experimental results show that the red soil from Yuelu mountain had a high arsenic removal rate of 97.1% after 24 hours. The isothermal adsorption fitted with Langmuir and Freundlich equations well, and the adsorption capacity was 500.20mg/kg. Kinetic data was consistent with the pseudo-second order kinetic equation, and the reaction rate was controlled mainly by chemical adsorption.