Graphene quantum dots on stainless-steel nanotubes for enhanced photocatalytic degradation of phenanthrene under visible light
- Authors
- Lee, Hanuk; Anwer, Hassan; Park, Jae-Woo
- Issue Date
- May-2020
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Photocatalyst; Stainless-steel; Nanotubes; Graphene; Persulfate; Phenanthrene
- Citation
- CHEMOSPHERE, v.246, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMOSPHERE
- Volume
- 246
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/9830
- DOI
- 10.1016/j.chemosphere.2019.125761
- ISSN
- 0045-6535
- Abstract
- A novel nanocomposite of stainless-steel nanotubes with graphene quantum dots (SSNT@GQD) was synthesized to degrade phenanthrene photocatalytically under visible light. Photocatalytic performance of bare stainless-steel nanotubes (SSNT) is not satisfactory due to the fast recombination of photoinduced electron-hole pairs. This phenomenon was effectively overcome by inclusion of GQDs and addition of persulfate as an external electron acceptor to improve charge separation. The pseudo-first-order rate constant of phenanthrene degradation by SSNT@GQD with persulfate under visible light was 0.0211 +/- 0.0006 min(-1), about 42 times higher than that of persulfate and visible light, 0.0005 +/- 0.0000 min(-1). Effects of different water quality parameters were investigated, including levels of initial pH, natural organic matters, bicarbonate, and chloride. Sulfate radicals, superoxide radicals, and photo-generated holes were the key reactive species in this photocatalytic process. Based on the analysis of intermediates using purge and trap-GC-MS, possible photocatalytic degradation pathways of phenanthrene in this process were proposed. The SSNT@GQD showed high figure of merit (99.5 without persulfate and 78.7 with persulfate) and quantum yield (1.56 x 10(-5) molecules photon(-1) without persulfate and 4.64 x 10(-5) molecules photon(-1) with persulfate), indicating that this material has excellent potential for practical photocatalysis applications.
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