Abstract:

In order to apply and extend diatomite to repair the soil polluted by lead effectively, and recover production capacity of contaminated soil step by step, fixation effect, adsorption process, isothermal adsorption and adsorption kinetics of Pb on diatomite were investigated and revealed. The results showed that, diatomite could change Pb from exchange state to residual state adequately, addition of diatomite wouldn’t change pH and organic matter of soil, the adsorption process of Pb2+ on diatomite was mainly governed by chemical reaction in channels, the kinetic of Pb2+ adsorption on diatomite was consistent with Pseudo-second-order, the equilibrium adsorption data of Pb2+ on diatomite fitted to Langmuir isotherm, qm of Pb2+ on diatomite was 10.428 mg/g. The diatomite could fix lead in the soil effectively, and decrease its bioavailability, and was an available improver for contaminated soil.