Scrolled titanate nanosheet composites with reduced graphite oxide for photocatalytic and adsorptive removal of toxic vapors
- Authors
- Giannakoudakis, Dimitrios A.; Vikrant, Kumar; LaGrow, Alec P.; Lisovytskiy, Dmytro; Kim, Ki-Hyun; Bandosz, Teresa J.; Colmenares, Juan Carlos
- Issue Date
- Jul-2021
- Publisher
- Elsevier B.V.
- Keywords
- CEES; Detoxification of chemical warfare agents; Graphite oxide composites; Mustard gas; Scrolled titania nanosheets; Titania nanotubes photocatalyst
- Citation
- Chemical Engineering Journal, v.415, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- Chemical Engineering Journal
- Volume
- 415
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1460
- DOI
- 10.1016/j.cej.2021.128907
- ISSN
- 1385-8947
- Abstract
- Nanocomposites (TiO-NTbs/rGO) consisting of titanate nanosheets (H2Ti3O7) scrolled to nanotubes (TiO-NTbs) and deposited on reduced graphite oxide (rGO) were synthesized through the combination of low-power/low-frequency (37 kHz) ultrasound and hydrothermal treatment procedures. The materials were characterized by X-ray diffraction, high-resolution transmission electron microscopy, N2 physisorption, thermal analysis (in air or helium), potentiometric titration, X-ray photoelectron spectroscopy, and diffuse reflectance spectroscopy. The addition of 4% rGO led to an optimal surface area of the composite (359 m2/g). The materials, when tested as media to remove toxic vapors of a chemical warfare agent (mustard gas) surrogate either under dark or visible light conditions, exhibited an adsorption capacity greater than 600 mg/g, which i was higher than those of other well-preforming materials (e.g., barium titanate nanoparticles or metal?organic frameworks). The photocatalytic activity of TiO-NTbs was also superior to that of P25 or other well-known nanomaterials. On their surface, various compounds of low- or non-toxicity were identified to be formed photochemically via free radical reactions.
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