BTZ-copolymer loaded graphene aerogel as new type Green and metal-freevisible light photocatalyst

Chi Him A. Tsang, John M. Tobin, Jin Xuan, Filipe Vilela, Haibao Huang, Dennis Y.C. Leung

Research output: Contribution to journalArticle

Abstract

This paper reports a new class of efficient, green and metal-free visible-light photocatalyst made from graphene aerogel (GA) doped with a conjugated porous polymer (CMPs). Hence, we report the synthesis of a benzothiadiazole (BTZ)-based CMP loaded into GA via a one-step hydrothermal reaction between 2D graphene oxide (GO) and the CMP, performed through a green process and under mild conditions. The as-prepared GA showed a bathochromic shift in the UV–vis diffraction reflectance spectroscopy (DRS) absorption edge to 628.5 nm, demonstrating its ability to absorb light in the visible region. SEM, TEM, XPS, EDX mapping results further showed the successful loading of the BTZ-based CMP in the GA array. The synthesized GA was used as a 3D structured photocatalyst for the visible-light-driven photodecomposition of methyl orange (MO) with an efficiency of 89.2% (5 wt% CMP). When compared to that of the pure CMP (86.9%), a comparable yet small increase in the efficiency was observed. This is due to a synergistic effect between GO and loaded polymer in GA array upon the formation of CMPGA hybrid structure via chemical interaction between BTZ-Py and GO throughout the mild hydrothermal reaction, and the enhanced photocatalytic activity exhibited from 1 mg equivalent polymer in the CMPGA2 hybrid when compared to the 20 mg pure polymer. Upon repeated use, the depreciation in photocatalytic activity was low with a <5% drop over 3 cycles. These results showed the CMP-loaded GA as an efficient metal-free photocatalyst and a promising material for further investigation into other photocatalytic applications.
LanguageEnglish
Pages50-63
Number of pages14
JournalApplied Catalysis B: Environmental
Volume240
Early online date28 Aug 2018
DOIs
StatePublished - Jan 2019

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Light Metals
Aerogels
Graphite
Photocatalysts
Cytidine Monophosphate
Copolymers
Polymers
Oxides
Metals
benzo-1,2,3-thiadiazole
Depreciation
Absorption spectroscopy
Energy dispersive spectroscopy

Cite this

Tsang, Chi Him A. ; Tobin, John M. ; Xuan, Jin ; Vilela, Filipe ; Huang, Haibao ; Leung, Dennis Y.C./ BTZ-copolymer loaded graphene aerogel as new type Green and metal-freevisible light photocatalyst. In: Applied Catalysis B: Environmental. 2019 ; Vol. 240. pp. 50-63
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abstract = "This paper reports a new class of efficient, green and metal-free visible-light photocatalyst made from graphene aerogel (GA) doped with a conjugated porous polymer (CMPs). Hence, we report the synthesis of a benzothiadiazole (BTZ)-based CMP loaded into GA via a one-step hydrothermal reaction between 2D graphene oxide (GO) and the CMP, performed through a green process and under mild conditions. The as-prepared GA showed a bathochromic shift in the UV–vis diffraction reflectance spectroscopy (DRS) absorption edge to 628.5 nm, demonstrating its ability to absorb light in the visible region. SEM, TEM, XPS, EDX mapping results further showed the successful loading of the BTZ-based CMP in the GA array. The synthesized GA was used as a 3D structured photocatalyst for the visible-light-driven photodecomposition of methyl orange (MO) with an efficiency of 89.2{\%} (5 wt{\%} CMP). When compared to that of the pure CMP (86.9{\%}), a comparable yet small increase in the efficiency was observed. This is due to a synergistic effect between GO and loaded polymer in GA array upon the formation of CMPGA hybrid structure via chemical interaction between BTZ-Py and GO throughout the mild hydrothermal reaction, and the enhanced photocatalytic activity exhibited from 1 mg equivalent polymer in the CMPGA2 hybrid when compared to the 20 mg pure polymer. Upon repeated use, the depreciation in photocatalytic activity was low with a <5{\%} drop over 3 cycles. These results showed the CMP-loaded GA as an efficient metal-free photocatalyst and a promising material for further investigation into other photocatalytic applications.",
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BTZ-copolymer loaded graphene aerogel as new type Green and metal-freevisible light photocatalyst. / Tsang, Chi Him A.; Tobin, John M.; Xuan, Jin; Vilela, Filipe; Huang, Haibao; Leung, Dennis Y.C.

In: Applied Catalysis B: Environmental, Vol. 240, 01.2019, p. 50-63.

Research output: Contribution to journalArticle

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T1 - BTZ-copolymer loaded graphene aerogel as new type Green and metal-freevisible light photocatalyst

AU - Tsang,Chi Him A.

AU - Tobin,John M.

AU - Xuan,Jin

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AU - Huang,Haibao

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AB - This paper reports a new class of efficient, green and metal-free visible-light photocatalyst made from graphene aerogel (GA) doped with a conjugated porous polymer (CMPs). Hence, we report the synthesis of a benzothiadiazole (BTZ)-based CMP loaded into GA via a one-step hydrothermal reaction between 2D graphene oxide (GO) and the CMP, performed through a green process and under mild conditions. The as-prepared GA showed a bathochromic shift in the UV–vis diffraction reflectance spectroscopy (DRS) absorption edge to 628.5 nm, demonstrating its ability to absorb light in the visible region. SEM, TEM, XPS, EDX mapping results further showed the successful loading of the BTZ-based CMP in the GA array. The synthesized GA was used as a 3D structured photocatalyst for the visible-light-driven photodecomposition of methyl orange (MO) with an efficiency of 89.2% (5 wt% CMP). When compared to that of the pure CMP (86.9%), a comparable yet small increase in the efficiency was observed. This is due to a synergistic effect between GO and loaded polymer in GA array upon the formation of CMPGA hybrid structure via chemical interaction between BTZ-Py and GO throughout the mild hydrothermal reaction, and the enhanced photocatalytic activity exhibited from 1 mg equivalent polymer in the CMPGA2 hybrid when compared to the 20 mg pure polymer. Upon repeated use, the depreciation in photocatalytic activity was low with a <5% drop over 3 cycles. These results showed the CMP-loaded GA as an efficient metal-free photocatalyst and a promising material for further investigation into other photocatalytic applications.

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