Effects of exogenous silicon on the adsorption kinetics characteristics of arsenic in soils of acidic paddy fields in northeast china

To explore the effects of exogenous silicon on the adsorption characteristics of arsenic in paddy field soils, the impacts of silicon on adsorption kinetic characteristics of arsenic in the acidic paddy field soil in northern China were studied under neutralizing alkaline of Sodium Silicate and balancing Na+ of different treatments. The results indicated that silicon reduced the adsorption amount of arsenic in soils and shortened the adsorption equilibrium time. The adsorption process of arsenic in the soil could be well described by Elovich equation. Silicon increased the equation parameters alpha and beta values, which indicated that exogenous silicon could accelerate the initial arsenic adsorption rate in soils and reduce the reaction rate during the absorption process.