The functionalization of limonite to prepare NZVI and its application in decomposition of p-nitrophenol
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Nano zero valent iron (NZVI) was prepared by reducing natural limonite using hydrogen. X-ray fluorescence, thermogravimetry, X-ray diffraction, transmission electron microscope, temperature programmed reduction (TPR), field emission scanning electron microscope/energy disperse spectroscopy (FESEM/EDS) were utilized to characterize the natural limonite and reduced limonite. The ratios of Fe:O before and after reducing was determined using EDS. The reactivity of the NZVI was assessed by decomposition of p-nitrophenol (p-NP) and was compared with commercial iron powder. In this study, the results of TPR and FESEM/EDS indicated that NZVI can be prepared by reducing natural limonite using hydrogen. Most importantly, this NZVI was proved to have a good performance on decomposition of p-NP and the process of p-NP decomposition agreed well with the pseudo-first-order kinetic model. The reactivity of this NZVI for decomposition of p-NP was greatly superior to that of commercial iron powder.
KeywordsLimonite Functionalization Nano zero valent iron p-Nitrophenol removal
This study was financially supported by the Natural Science Foundation of China (No. 41130206, 41402030, 41172048, 41572029). The authors appreciate the financial and infrastructure support of the School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, for this research.
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