Zero-Valent Aluminum for Oxidative Degradation of Aqueous Organic Pollutants
SCIE
SCOPUS
- Title
- Zero-Valent Aluminum for Oxidative Degradation of Aqueous Organic Pollutants
- Authors
- Bokare, AD; Choi, W
- Date Issued
- 2009-09-15
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Oxidative degradation of aquatic organic contaminants using zero-valent aluminum (ZVAI) in the presence of dissolved oxygen (O-2) Was investigated. The metal corrosion process in acidic conditions (pH <4) was accompanied by electron transfer from ZVAI to O-2, which led to the simultaneous generation of Al3+ and hydrogen peroxide (H2O2). The oxidation of 4-chlorophenol (4-CP), a model substrate, was initiated by the generation of hydroxyl radicals (HO center dot) via electron transfer from Al-0 to H2O2-Degradation was initiated after an induction period of about 2 h, during which the native oxide layer was dissoluted. The HO center dot- mediated oxidation reaction was completely quenched by adding methanol as a radical scavenger, Systematic studies on the effects of ZVAI loading, pH, and surface oxide content revealed that the oxide layer dissolution controlled the All-mediated oxidation of 4-CP. The proposed process is similarly compared with the zero-valent iron (ZVI) system, but the ZVAl/O-2 system showed a higher oxidation capacity compared with ZVI/O-2 because of the stability of aquo-complexed Al3+ ions over a wider pH range. The degradation of phenol, nitrobenzene, and dichloroacetate was also successfully achieved with ZVAI. The present study proposes the ZVAl/O-2 process as a viable method of oxidative water treatment.
- Keywords
- OXYGEN ACTIVATION; ELECTRON SHUTTLE; WATER-TREATMENT; IRON; CHEMISTRY; DIOXYGEN
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/27756
- DOI
- 10.1021/es9013823
- ISSN
- 0013-936X
- Article Type
- Article
- Citation
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 43, no. 18, page. 7130 - 7135, 2009-09-15
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