铁铝吸附剂对起爆药污染土壤中锑的稳定化研究

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Abstract Iron-based (ferrous sulfate, goethite and iron powder) and aluminum-based (aluminum hydroxide powder) adsorbents were amended to stabilize antimony (Sb) in primary explosives contaminated soils. The stabilizing effects of iron-based adsorbent, aluminum-based adsorbent, and iron-aluminum mixed adsorbent, as well as the changes of specific surface area and the transformation of Sb after stabilization were investigated by sorption isotherm experiments, batch leaching experiments, specific surface area determination and European Community Bureau of Reference (BCR) analysis. Results showed that the isothermal sorption of different iron-based adsorbents for Sb were well described by the Freundlich equation, and the sorption capacity of FeSO₄(log K_f = 5.85) was significantly higher than Fe⁰ (log K_f = 3.21) and goethite (log K_f = 4.32). After 10days, the stabilization efficiency of different iron-based adsorbents for Sb increased with addition, and 10% FeSO₄ (97.1%) > 10% Fe⁰ (72.3%) > goethite (41.0 %). The concentrations of Zn, Cu and Pb in leachates from the soils amended by FeSO₄ were 1990.2, 2.8 and 21.6 times higher than control respectively, and it also decreased significantly by aluminum hydroxide amendments. With 4 % addition of aluminum hydroxide, the stabilization efficiencies for Zn, Cu, and Pb was 93.8%、93.5% and 98.3%, respectively. The mixture of 5% FeSO₄ sulfate and 4% aluminum hydroxide had the best stabilization effect on Sb, Zn, Cu, and Pb in soil, and the maximum stabilization efficiencies were 94.6%、74.2%、82.2% and 97.6% respectively after 10days. Further analysis revealed that, the specific surface area could reach 1.31~1.67 times that of the original soils and the residual fraction of Sb also increased by 0.037~0.197 times after adding the iron-aluminum mixed adsorbents, which was consistent with the stabilization effect. Our results indicated that using iron-aluminum mixed adsorbent is an effective way to stabilize heavy metals combined contaminated soils.

Key words： antimony primary explosives contaminated soil heavy metal stabilization iron/aluminum-based agents

Received: 16 December 2019

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X53

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	Articles by authors
	JIANG Yu-cong
	XIA Tian-xiang
	JIA Xiao-yang
	ZHONG Ming-yu
	WANG Ning-ning
	LI Ning

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JIANG Yu-cong,XIA Tian-xiang,JIA Xiao-yang等. Study on stabilization of antimony (Sb) in contaminated soil by primary explosives using iron-based and aluminum-based adsorbents[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3520-3529.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I8/3520

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