Mechanism Study of Iron-Manganese Composites for Thallium Removal in Industrial Wastewate
Metal thallium(Tl)is extremely poisonous.The fatal dose of thallium for humans is about 10-15 mg·kg-1.Manganese oxides are promising for the prevention and control of thallium pollution because of their excellent adsorption properties.Nevertheless,manganese leaching from manganese oxides during thallium adsorption can result in secondary environmental pollution.Therefore,Fe-Mn composites were prepared by introducing Fe to reduce the leaching of Mn during adsorption.The outcomes demonstrate that adding Fe can greatly lessen manganese leaching.When the initial Tl concentration was 10 mg·L-1,the removal rate of thallium by Tl 1 mg·L-1 Fe-Mn composite material was more than 99%,and the concentration of Tl in the treated aqueous solution was only 0.14 mg·L-1.Besides,the concentration of Mn leaching was also regulated within the national emission standard(0.3 mg·L-1)and reached 0.11 mg·L-1.The isothermal adsorption curve showed that the maximum adsorption capacity of the Fe-Mn composite was 539.4 mg·L-1 at 308 K.This indicated that the Fe-Mn composite could effectively reduce the Mn leaching and remove Tl efficiently at the same time.
thallium removalmanganese leachingiron-manganese compositesisothermal adsorptionpollutionprevention and controlindustrial wastewatermechanism
万方数据
维普
