期刊
CHEMOSPHERE
卷 222, 期 -, 页码 556-563出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.01.171
关键词
Goethite; Fulvic acid; Coprecipitation; Immobility; Pb/Cd
资金
- National Natural Science Foundation of China [21677052, 21677041]
- Science and Technology Planning Project of Guangdong Province [2016A040403111, 2015A030401106]
- National Key Research and Development Program [2018YFC1802803, 2017YFD0801302, 2018YFC1800304]
The coprecipitation of organic matter (OM) and minerals is a relatively common phenomenon in soil, and it has a significant influence on the surface properties and reactivity of minerals. In turn, the fate of pollutants in soil is greatly affected by the organic-mineral composites. In this study, goethite-fulvic acid (Ge-FA) composites with varying FA mass ratios in the range of 0-15% were synthesized by coprecipitation. The sample properties were studied using XRD, FTIR, SEM-EDS and N-2 gas adsorption techniques. The influence of Ge-FA on the mobility of Pb/Cd in soil was investigated. The crystal forms of Ge-FA changed from goethite (FA <= 4%) to hematite (FA >= 5%), and the FA affected the Fe-O bond vibrations. These results demonstrated that FA was successfully introduced into the iron oxide. Ge-FA changed from a filamental morphology to an aggregate as the FA ratio increased. The coprecipitation resulted in blockages of iron oxides, thereby decreasing the specific surface area and pore volume. The adsorption amount of Pb(II) on Ge-FA increased as the FA ratio increased, but no significant change was observed for Cd(II). With the application of Ge-FA, the exchangeable concentrations of Pb and Cd in contaminated soil decreased by 42.4%-93.6% and 15.8%-43.7%, respectively. The exchangeable and carbonate bound fractions of Pb and Cd decreased and were transformed into the Fe-Mn bound and residual fractions. (C) 2019 Elsevier Ltd. All rights reserved.
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