ADSORPTION PERFORMANCE OF MOLYBDENUM ONTO HUMUS

The adsorption of molybdenum onto humus was studied by simulation． pH，time，temperature，dosing quantity and competitive anions were investigated during adsorption process． The adsorption mechanism was researched by the method of adsorption isotherm and kinetic model． The results showed that the removal efficiency of molybdenum from solution attached 90% at least，with pH ＜ 3，adsorptim time of 30 min，humus dosage 1 g，and a temperature of 25 ～ 30 ℃． The equilibrium adsorption capacity was 1. 014 mg/g at the optimum conditions． Phosphate appeared to compete strongly with MoO2 － 4 and the removal efficiency of molybdenum decreased from over 90% to 60% or so． Silicate and sulfate did a negligible effect on the sorption of MoO2 － 4 ． The Langmuir isotherm adsorption model and the pseudo second-order rate equation could fit the experimental data well． It meant that adsorption molybdenum onto humus was chemical adsorption and was controlled by chemical reactor． The conclusion showed that humus could be applied in adsorption of molybdenum in the future．