- Title
- An integrated biodegradation and nano-oxidation used for the remediation of naphthalene from aqueous solution
- Creator
- Yu, Bing; Jin, Xiaoying; Kuang, Ye; Megharaj, Mallavarapu; Naidu, Ravendra; Chen, Zuliang
- Relation
- Chemosphere Vol. 141, Issue December 2015, p. 205-211
- Publisher Link
- http://dx.doi.org/10.1016/j.chemosphere.2015.07.050
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2015
- Description
- The remediation of toxic persistent organic contaminants in the environment has raised a need for effective cleanup methods. In this study, an integrated remediation technique based on biodegradation of naphthalene using Bacillus fusiformis and Fenton oxidation of their degraded metabolites using nanoscale zero-valent iron (nZVI). A 99.0% naphthalene was biodegraded by B. fusiformis in 96 h, while only 59.4% chemical oxygen demand (COD) was removed, indicating that the degraded metabolites existed in solution. To further degrade the metabolites, nanoscale zero-valent iron (nZVI) was used as heterogeneous catalyst for Fenton-like oxidation of the metabolites after biodegradation lasting 40 h. Results showed that the total the removal COD increased from 36.4% to 91.6% at pH 3.0, 1.0 g L−1 nZVI, 10.0 mM L−1 H₂O₂ and temperature of 35 °C. Scanning electron microscopy (SEM) showed the aggregation and corrosion of nZVI. X-ray diffraction (XRD) confirmed the existence of Fe⁰ and the presence of iron oxide (Fe(II)) and iron oxohydroxide (Fe(III)). A possible degradation pathway was proposed since two naphthalene metabolites (1-Naphthalenol and 1,4-Naphthalenedione) were detected by GC–MS.
- Subject
- biodegradation; naphthalene; fenton-like oxidation; hydroxyl radical; nZVI
- Identifier
- http://hdl.handle.net/1959.13/1331364
- Identifier
- uon:26611
- Identifier
- ISSN:0045-6535
- Language
- eng
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