Abstract
Composite of nanoscale Zero Valent Iron (nZVI) loaded on Biochar (BC) was prepared and characterized as hydrogen peroxide (H2O2) activator for the degradation of trichloroethylene (TCE). nZVI is homogeneously loaded on lamellarly structured BC surfaces to form nZVI/BC with specific surface area (SBET) of 184.91 m2 g−1, which can efficiently activate H2O2 to achieve TCE degradation efficiency of 98.9% with TOC removal of 78.2% within 30 min under the conditions of 0.10 mmol L−1 TCE, 1.13 g L−1 nZVI/BC and 1.50 mmol L−1 H2O2. Test results from the Electron Spin Resonance (ESR) measurement and coumarin based fluorescent probe technology indicated that ∙OH radicals were the dominant species responsible for the degradation of TCE within the nZVI/BC-H2O2 system. Activation mechanism of the redox action of Fe2+/Fe3+ generated under both aerobic and anaerobic conditions from nZVI and single electron transfer process from BC surface bound C–OH to H2O2 promoted decomposition of H2O2 into ∙OH radicals was proposed.
Highlights
As one of the most commonly used chemicals in industry, chlorinated solvents such as trichloroethylene (TCE) has been frequently encountered in subsurface environments as dense non-aqueous phase liquids (DNAPLs) at many industrial sites[1,2]
SEM analyses were firstly conducted to observe the morphologies of the prepared nanoscale Zero Valent Iron (nZVI), BC and nZVI/BC, respectively
Lamellarly structured BC of rough surface morphologies was obtained, and nZVI was homogeneously loaded on BC surface from the SEM image of nZVI/BC composite
Summary
As one of the most commonly used chemicals in industry, chlorinated solvents such as trichloroethylene (TCE) has been frequently encountered in subsurface environments as dense non-aqueous phase liquids (DNAPLs) at many industrial sites[1,2]. H2O2) is a powerful oxidant generating the hydroxyl radicals (∙OH, E0 = 2.80 V), which react with various organic compounds at the near-diffusion controlled rates[6,7], leading to an effective degradation and mineralization of organic pollutants[8]. The present work aims to (1) synthesize a novel composite of nZVI/BC, where nZVI was loaded on BC surface uniformly and the aggregation of nZVI was prevented effectively, (2) characterize nZVI/ BC activation ability for H2O2 to degrade TCE in aqueous solution, and (3) explore the activation mechanisms of H2O2 in the presence of nZVI/BC
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