期刊
CHEMOSPHERE
卷 186, 期 -, 页码 495-500出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.08.014
关键词
Zero valent iron; Particle size; Biochar; Heavy metal; Sorption; Reduction
资金
- Startup Fund for distinguished scholars of Yangzhou University [5016/137011014]
- Industry-University-Research-Application Cooperative Innovation Key Program of Yangling Agricultural Hi-tech Industries Demonstration Zone [2017CXY-10]
- National Key Research and Development Project of China [2016YFD0800304]
- Natural Science Foundation of Shandong [ZR2017MD023]
- Lvyangjinfen talent program of Yangzhou City
In this work, nZVI was immobilized by bamboo derived biochars (nZVI/BB), hydrogen peroxide (H2O2) (nZVI/PBB) and nitric acid (HNO3) (nZVI/HBB) modified BB. H2O2 and HNO3 deceased surface area and pore volume of pristine biochars. Total iron (Fe) contents were 16.50, 24.40, and 13.08% for nZVI/BB, nZVI/PBB and nZVI/HBB, respectively. The X-ray diffraction revealed that nZVI in biochar matrix was dominantly metallic Fe coated with Fe oxides. The transmission electron microscopy indicated nZVI particle sizes were 41.5, 30.5 and 6.1 nm for nZVI/BB, nZVI/HBB and nZVI/PBB, respectively. The removal capacities of arsenate (AsV) and silver ions (Ag+) by nZVI nanocomposites were compared in a batch experiment. Greater reductive removal of Ag+ (1217 g kg(-1) nZVI) and sorptive removal of MV (109.1 g kg(-1) nZVI) were achieved in nZVI/PBB, indicating smaller-sized nZVI was more reactive. Thus, particle size of nZVI affected the sorptive and reductive capacities for MV and Ag+. (C) 2017 Elsevier Ltd. All rights reserved.
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