The Removal of Antimony by Novel NZVI-Zeolite: the Role of Iron Transformation
2015
Zhou, Zhe | Dai, Chaomeng | Zhou, Xuefei | Zhao, Jianfu | Zhang, Yalei
Nanoscale zero valent iron (NZVI) supported on beta zeolite was synthesized by refined method for the removal of Sb(III) and characterized with TEM-EDX, XRD, XPS, BET, and Zetasizer. The results showed that NZVI existed as apparent ones doping on surface of beta zeolite (average size 20–40 nm) and fine ones formed in structure of beta zeolite (<1 nm). Compared to NZVI, NZVI-zeolite showed enhanced antimony removal ability and higher iron efficiency due to its better dispersibility and smaller size. Adsorption and reduction ability of iron played main roles in the antimony removal. The removal isotherm was better fitted by Freundlich model. According to XPS analysis, reduction of Sb(III) happened rapidly and Sb(0) took more than 80 % in final products, which was higher compared with NZI. Iron transformation accompanied with antimony removal was identified by XRD and XPS, which caused antimony reduction and facilitate further immobilization of removed antimony. The iron oxides encapsulated antimony in their own structure and beta zeolite which they adhere. The theoretical model about the process was proposed to illustrate NZVI-zeolite enhanced antimony removal ability.
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