期刊
CHEMOSPHERE
卷 307, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.135853
关键词
Iron oxide; Immobility; Heavy metal; Lignin; Acid rain
资金
- Science and Technology Planning Project of Guangdong Province [2021A0505030045]
- Key Research and Development Program of Guangdong Province [2019B110207001]
- National Key Research and Development Program [2018YFC1802803]
Iron oxide-lignin composites (GLS) are effective in immobilizing Cd and Pb in soil and exhibit better stability under acid rain conditions. GLS has a higher adsorption capacity and unique microstructure, transforming mobile and exchangeable Cd/Pb into organic and amorphous Fe oxide-bound fractions.
Iron oxide-lignin composites (GLS) were prepared based on the significant role of Fe-OM in the environmental behaviour of heavy metals and lignin binding with iron oxide preferentially in soil. GLS was applied in Cd/Pb immobilization and the stability under acid rain was investigated. The results show that the iron oxide appeared weakly crystalline or amorphous similar to 2-line ferrihydrite after the addition of lignin. Agglomerates of nanoparticles with higher adsorption capacity were observed for GLS. The mobility factor (MF) of Cd/Pb in the soil decreased rapidly after adding GLS. At the 3% dosage, the MF of Cd and Pb in the soil was decreased by 58.94% and 78.15% respectively, which was approximately 5 times that of goethite (GE). The mobile and exchangeable Cd/Pb were converted to organic, amorphous Fe oxide-bound and residue fractions. Under acid rain conditions, MF continues to decline for the GLS group, increasing the organic and amorphous Fe oxide-bound fractions, while for control group (CK) and GE, the trend was the opposite. Lignin could inhibit iron oxide dissolution and stabilize the combination of Cd/Pb and iron oxides in soil. The better stability performance of GLS for Cd/Pb may be related to the higher adsorption capacity and microstructural difference after iron oxide combined with lignin.
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