SnO2 aerogel deposited onto polymer-derived carbon foam for environmental remediation

Kim, Tae-Hee; Phadtare, Varsha D.; Han, Wooje; Lee, Kyu Yeon; Jung, Hae Noo Ree; Choi, Hee Young; Kim, Yonghun; Yadav, Hemraj M.; Park, Hyung Ho

doi:10.1016/j.molliq.2019.110990

Cited by 31 publications

(7 citation statements)

References 60 publications

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“…Moreover, BNAs possess high thermal conductivity and they remain stable up to 1000 o C which make them attractive materials for applications required to perform reliably under harsh environments 7 . Besides graphene and boron nitride based aerogels, the area is highly active and other materials have also been tested, including silica 8 , 9 and SnO 2 10 based aerogels that show attractive properties and have been used in various applications.…”

Section: Introductionmentioning

confidence: 99%

Multi-functional 2D hybrid aerogels for gas absorption applications

Androulidakis

Kotsidi

Gorgolis

et al. 2021

Sci Rep

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Aerogels have attracted significant attention recently due to their ultra-light weight porous structure, mechanical robustness, high electrical conductivity, facile scalability and their use as gas and oil absorbers. Herein, we examine the multi-functional properties of hybrid aerogels consisting of reduced graphene oxide (rGO) integrated with hexagonal boron nitride (hBN) platelets. Using a freeze-drying approach, hybrid aerogels are fabricated by simple mixing with various volume fractions of hBN and rGO up to 0.5/0.5 ratio. The fabrication method is simple, cost effective, scalable and can be extended to other 2D materials combinations. The hybrid rGO/hBN aerogels (HAs) are mechanically robust and highly compressible with mechanical properties similar to those of the pure rGO aerogel. We show that the presence of hBN in the HAs enhances the gas absorption capacities of formaldehyde and water vapour up to ~ 7 and > 8 times, respectively, as compared to pure rGO aerogel. Moreover, the samples show good recoverability, making them highly efficient materials for gas absorption applications and for the protection of artefacts such as paintings in storage facilities. Finally, even in the presence of large quantity of insulating hBN, the HAs are electrically conductive, extending the potential application spectrum of the proposed hybrids to the field of electro-thermal actuators. The work proposed here paves the way for the design and production of novel 2D materials combinations with tailored multi-functionalities suited for a large variety of modern applications.

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Section: Introductionmentioning

confidence: 99%

Multi-functional 2D hybrid aerogels for gas absorption applications

Androulidakis

Kotsidi

Gorgolis

et al. 2021

Sci Rep

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“…Semiconductors (e.g. TiO 2 , ZnO, SnO 2 ) have been widely researched for organic pollutant degradation, however, the large band gap hinders their practical applications 8 – 12 . For example, TiO 2 with band gap of 3.2 eV can only absorb the ultra-violet light, accounting for only 4–5% of entire solar spectrum 13 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible light photocatalytic activity of Fe2O3 modified TiO2 prepared by atomic layer deposition

Cao

Zhao

et al. 2020

Sci Rep

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In this work, commercial anatase TiO 2 powders were modified using ultrathin Fe 2 o 3 layer by atomic layer deposition (ALD). The ultrathin Fe 2 o 3 coating having small bandgap of 2.20 eV can increase the visible light absorption of tio 2 supports, at the meantime, Fe 2 o 3 /tio 2 heterojunction can effectively improve the lifetime of photogenerated electron-hole pairs. Results of ALD Fe 2 o 3 modified TiO 2 catalyst, therefore, showed great visible light driven catalytic degradation of methyl orange compared to pristine tio 2. A 400 cycles of ALD Fe 2 o 3 (~ 2.6 nm) coated TiO 2 powders exhibit the highest degradation efficiency of 97.4% in 90 min, much higher than pristine TiO 2 powders of only 12.5%. Moreover, an ultrathin ALD Al 2 o 3 (~ 2 nm) was able to improve the stability of Fe 2 o 3-tio 2 catalyst. These results demonstrate that ALD surface modification with ultrathin coating is an extremely powerful route for the applications in constructing efficient and stable photocatalysts. A rapid industrial development driven by unsustainable technology advances can cause plenty of industrial sewage, spreading chemical hazards into water resources. As a result, water pollution has emerged as one of the most serious environmental issues worldwide 1-4. Photocatalytic oxidation technology has shown great prospects in removing the toxic and harmful contaminants in aqueous environment 5-7. Semiconductors (e.g. TiO 2 , ZnO, SnO 2) have been widely researched for organic pollutant degradation, however, the large band gap hinders their practical applications 8-12. For example, TiO 2 with band gap of 3.2 eV can only absorb the ultraviolet light, accounting for only 4-5% of entire solar spectrum 13. Therefore, various visible light sensitive photocatalysts has also been widely explored, such as g-C 3 N 4 , BiVO 4 , CdSe, Bi 2 WO 6 14-19. On the other hand, TiO 2 is recognized as one of the excellent materials owning to its good inertness, eco-friendly, low cost, strong oxidizing power, and long-term stability against photo and chemical corrosion 9,13,20-22. Thus, plenty of works have been made to extend the absorption spectrum of TiO 2 to visible light so to make a full use of solar spectrum. Several different approaches can be employed, including doping 23-26 and coupling with small band gap semiconductors or metals 27-30. Small band gap semiconductors not only increase the absorption of visible light but also inhibit photogenerated electrons-holes recombination when constructed as a semiconductor/semiconductor heterojunction structure, thus improving the photocatalytic performance dramatically 31. Therefore, various TiO 2 based heterojunction photocatalysts have been proposed for visible light photocatalysis, including NiO/TiO 2 32,33

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“…The semi-conductive photocatalysts generally used are titanium dioxide or titania (TiO 2 ) [ 21 , 22 , 23 ], ZnO [ 24 , 25 ], WO 3 [ 26 , 27 ], Fe 2 O 3 [ 28 , 29 ], CeO 2 [ 30 , 31 ], MoO 3 [ 32 , 33 ], ZrO 2 [ 34 , 35 ], SnO 2 [ 36 , 37 ], CdS [ 38 , 39 ], and ZnS [ 40 , 41 ]. Up to now, semiconductor-based photocatalysts in various forms have been proposed, mainly as nanopowders [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ] or aerogels [ 49 , 50 , 51 , 52 , 53 , 54 ], due to the high specific surface area of these materials, resulting in a very high contact between the semiconductor and the fluid to be treated and, consequently, the photocatalytic performance could be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Supercritical Carbon Dioxide-Based Processes in Photocatalytic Applications

et al. 2021

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Conventional methods generally used to synthesize heterogeneous photocatalysts have some drawbacks, mainly the difficult control/preservation of catalysts’ morphology, size or structure, which strongly affect the photocatalytic activity. Supercritical carbon dioxide (scCO2)-assisted techniques have recently been shown to be a promising approach to overcome these limitations, which are still a challenge. In addition, compared to traditional methods, these innovative techniques permit the synthesis of high-performance photocatalysts by reducing the use of toxic and polluting solvents and, consequently, the environmental impact of long-term catalyst preparation. Specifically, the versatility of scCO2 allows to prepare catalysts with different structures (e.g., nanoparticles or metal-loaded supports) by several supercritical processes for the photocatalytic degradation of various compounds. This is the first updated review on the use of scCO2-assisted techniques for photocatalytic applications. We hope this review provides useful information on different approaches and future perspectives.

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SnO2 aerogel deposited onto polymer-derived carbon foam for environmental remediation

Cited by 31 publications

References 60 publications

Multi-functional 2D hybrid aerogels for gas absorption applications

Multi-functional 2D hybrid aerogels for gas absorption applications

Enhanced visible light photocatalytic activity of Fe2O3 modified TiO2 prepared by atomic layer deposition

Supercritical Carbon Dioxide-Based Processes in Photocatalytic Applications

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