第二届全国土壤修复大会

Using the co-precipitation method, a composite adsorbent with FeMnNi-LDHs
loaded on fulvic acid was successfully prepared. The adsorption performance and
influencing factors of the material on As and Cd in water were studied, and the
adsorption mechanism of the material on As and Cd was explored.
●Set the metal ion molar ratio of hydrotalcite as Fe: Mn: Ni =1:1:2, and prepare
FeMnNi-LDHs with different mass ratios of fulvic acid loading on this basis, and
compare with the original FeMnNi-LDHs without adding fulvic acid .
●XRD (X-ray diffraction), TEM (transmission electron microscopy), FT-IR
(infrared spectroscopy) and TGA (thermogravimetry) were used to characterize
the morphology and structure of FA@FeMnNi-LDHs. It shows that the material
has XRD characteristic peaks of layered double hydroxides (LDHs) and
characteristic absorption peaks of FT-IR, and both have a good layered structure.
●A series of different mass ratios of composite FA@FeMnNi-LDHs and original
FeMnNi-LDHs were subjected to isothermal adsorption experiments and kinetic
experiments for single As system, single Cd system, and composite AsCd system
in water, to determine the best FA loading material (0.1g FA).
●The stability and functionality of the composite material were tested through the
pH influence experiment and the competitive ion experiment on the composite
material, indicating the effective adsorption and removal of AsCd composite
pollution.