Efficiency of nanoscale zero-valent iron on the enhanced low molecular weight organic acid removal Pb from contaminated soil.
作者： Guiyin Wang , Shirong Zhang , Xiaoxun Xu , Ting Li , Yun Li
DOI: 10.1016/J.CHEMOSPHERE.2014.09.081
关键词: Citric acid 、 Environmental chemistry 、 Desorption 、 Soil contamination 、 Phosphorus 、 Soil water 、 Zerovalent iron 、 Environmental remediation 、 Chemistry 、 Organic acid
摘要: The Pb removal efficiencies from contaminated soils by low molecular weight organic acid (LMWOA) and nanoscale zero-valent iron (nZVI) were investigated through batch soil washing experiments. Results showed that significant promotion on Pb-removal with the mixed solutions of LMWOA nZVI (p < 0.05). reached 64% 83% for mine farmland addition 0.2 M citric 2.0 g L−1 nZVI, respectively. They decreased increasing pH 3 to 9. induced Pb(II) releases processes including a rapid desorption within 4 h slow in following hours. second-order model was most appropriate describing kinetic desorption. main fractions exchangeable reducible. Compared LMWOA, loss rates nitrogen, phosphorus potassium after solutions. Our study suggests combining would be promising alternative approach remediation Pb-contaminated soils.
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