Journal
APPLIED SURFACE SCIENCE
Volume 333, Issue -, Pages 220-228Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2015.02.025
Keywords
Nanoscale zero-valent iron; Mesoporous silica; p-Nitrophenol; Reduction
Categories
Funding
- Young Top-Notch Talent Support Program of China
- National Natural Science Foundation of China [51222805]
- Program for New Century Excellent Talents in University from the Ministry of Education of China [NCET-11-0129]
- Interdisciplinary Research Project of Hunan University
- Fundamental Research Funds for the Central Universities
- Hunan University
- Foundation for the Author of Excellent Doctoral Dissertation of Hunan Province
- Hunan Provincial Innovation Foundation [CX2009B080]
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In this study, nanoscale zero-valent iron particles immobilized on mesoporous silica (nZVI/SBA-15) were successfully prepared for effective degradation of p-nitrophenol (PNP). The nZVI/SBA-15 composites were characterized by N-2 adsorption/desorption, transmission electron microscopy (TEM), UV-vis spectrum and X-ray photoelectron spectroscopy (XPS). Results showed that abundant ultrasmall nanoscale zero-valent iron particles were formed and well dispersed on mesoporous silica (SBA-15). Batch experiments revealed that PNP removal declined from 96.70% to 16.14% as solution pH increased from 3.0 to 9.0. Besides, degradation equilibrium was reached within 5 min, which was independent of initial PNP concentration. Furthermore, only a little PNP elimination on SBA-15 indicated that nZVI immobilized on mesoporous silica was mainly responsible for the target contaminant removal. The UV-vis spectrum and XPS measurement confirmed that the PNP removal was a reductive degradation process, which was further proved by the detected intermediates using gas chromatography-mass spectrometry (GC/MS). The excellent antioxidation ability had been discovered with more than 80% of PNP being removed by nZVI/SBA-15 treated with 30 days' exposure to air. These results demonstrated the feasible and potential application of nZVI/SBA-15 composites in organic wastewater treatment. (C) 2015 Elsevier B.V. All rights reserved.
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