The Effects of Environmental Materials on Pb and Cd Solidification
摘要
The leaching experiments of soils contaminated by heavy metal Pb or Cd were conducted with four kinds of environmental materials, polymer absorbent material (PAM) ,coal-based nutrient (CBN) ,mineral adsorption material (MAM) and mineral chemical material (MCM) to explore Pb and Cd solidification effects. Then the Fourier Transform Infrared Spectrometer (FTIR) analysis was used to explain the solidification mechanism of the effective environmental materials,and the Scanning Electron Microscope (SEM) test was applied to demonstrate their solidification morphology. The results showed that MCM was the best material for Pb solidification,and Pb concentration in the leachate accounted for 68. 6% of that in CK; MAM was the best material for Cd solidification,and the Cd concentration accounted for 74. 6% of that in CK. The FTIR analysis showed the functional groups,such as C-OH in MCM and COOH in MAM,could explain the adsorption mechanism by ion exchange and chemical bond force. The SEM images indicated there were obvious adsorption morphological changes in MCM and MAM after adsorbing Pb and Cd respectively.