Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 52, Issue 4, Pages 2178-2185Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b05303
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Funding
- National Key Research and Development Program of China [2017YFA0207001, 2016YFD0800204]
- National Natural Science Foundation of China [41671478, 41671239]
- Natural Science Foundation of Jiangsu Province of China [BK20170050]
- 135 Program of Institute of Soil Science [ISSASIP1660]
- Youth Innovation Promotion Association of CAS [2014270]
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The interaction of naturally occurring minerals with H2O2 affects the remediation efficiency of polluted sites in in situ chemical oxidation (ISCO) treatments. However, interactions between vanadium(V) minerals and H2O2 have rarely been explored. In this study, H2O2 decomposition by various vanadium-containing minerals including V(III), V(IV), and V(V) oxides was examined, and the mechanism of hydroxyl radical ((OH)-O-center dot) generation for contaminant degradation was studied. Vanadium minerals were found to catalyze H2O2 decomposition efficiently to produce (OH)-O-center dot for diethyl phthalate (DEP) degradation in both aqueous solutions with a wide pH range and in soil slurry. Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) analyses, and free radical quenching studies suggested that (OH)-O-center dot was produced via single electron transfer from V(III)/V(IV) to H2O2 followed a Fenton-like pathway on the surface of V2O3 and VO2 particles, whereas the oxygen vacancy (OV) was mainly responsible for (OH)-O-center dot formation on the surface of V2O5 particles. This study provides new insight into the mechanism of interactions between vanadium minerals and H2O2 during H2O2-based ISCO.
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