One-pot synthesis of Ag-MWCNT@TiO2 core–shell nanocomposites for photocatalytic reduction of CO2 with water under visible light irradiation

Gui, Meei Mei; Wong, William Ming Ping; Chai, Siang‐Piao; Mohamed, Abdul Rahman

doi:10.1016/j.cej.2014.09.022

Cited by 79 publications

(21 citation statements)

References 23 publications

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“…Gui et al [ 80 ] successfully fabricated the Ag-MWCNT@TiO 2 nanocomposite by using the simple one-pot synthesis approach for the reduction of CO 2 . Different concentrations of Ag were used to observe the effect on the reduction of CO 2 .…”

Section: Synthesis Methods Of Tio 2 -Based Photoca...mentioning

confidence: 99%

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

et al. 2022

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Photocatalytic CO2 reduction is a most promising technique to capture CO2 and reduce it to non-fossil fuel and other valuable compounds. Today, we are facing serious environmental issues due to the usage of excessive amounts of non-renewable energy resources. In this aspect, photocatalytic CO2 reduction will provide us with energy-enriched compounds and help to keep our environment clean and healthy. For this purpose, various photocatalysts have been designed to obtain selective products and improve efficiency of the system. Semiconductor materials have received great attention and have showed good performances for CO2 reduction. Titanium dioxide has been widely explored as a photocatalyst for CO2 reduction among the semiconductors due to its suitable electronic/optical properties, availability at low cost, thermal stability, low toxicity, and high photoactivity. Inspired by natural photosynthesis, the artificial Z-scheme of photocatalyst is constructed to provide an easy method to enhance efficiency of CO2 reduction. This review covers literature in this field, particularly the studies about the photocatalytic system, TiO2 Z-scheme heterojunction composites, and use of transition metals for CO2 photoreduction. Lastly, challenges and opportunities are described to open a new era in engineering and attain good performances with semiconductor materials for photocatalytic CO2 reduction.

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Section: Synthesis Methods Of Tio 2 -Based Photoca...mentioning

confidence: 99%

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

et al. 2022

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“…The XRD patterns of all nanocomposite films exhibited similar diffraction peaks, corresponding to the anatase-rutile mixed phase. The diffraction peaks observed at 25.4, 37.5, 38.3, 39.1, 48.5, 54.8, 55.5 • corresponded to the 101, 103, 004, 112, 200, 105, and 211 diffraction peaks of anatase TiO 2 , respectively [2,18,19]. The highest intensity at 2θ = 25.4 • indicated that anatase (101) is the most dominant crystal phase of the nanocomposite films, which was confirmed by the selected-area electron diffraction (SAED) pattern (Figure S3).…”

Section: Crystalline Phase Of Ag-tio 2 Nanocomposite Filmmentioning

confidence: 97%

Effect of Heating Rate on the Photocatalytic Activity of Ag–TiO2 Nanocomposites by One-Step Process via Aerosol Routes

et al. 2021

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Ag–TiO2 nanocomposite films, based of Ag and TiO2 nanoparticles, were fabricated in a one-step aerosol route employing the simultaneous plasma-enhanced chemical vapor deposition and physical vapor deposition systems. The as-fabricated films were subjected to different heating rates (3 to 60 °C/min) with a constant annealing temperature of 600 °C to observe the significant changes in the properties (e.g., nanoparticle size, crystalline size, crystallite phase, surface area) toward the photocatalytic performance. The photocatalytic activity was evaluated by the measurement of the degradation of a methylene blue aqueous solution under UV light irradiation, and the results revealed that it gradually increased with the increase in the heating rate, caused by the increased Brunauer–Emmett–Teller (BET) specific surface area and total pore volume.

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“…Recently, coupling TiO 2 with carbon-based nanomaterials including graphene and its derivatives (etc. graphene (GR) ( Tu et al, 2013 ; Xiong et al, 2016 ; Biswas et al, 2018 ; Jung et al, 2018 ; Shehzad et al, 2018; Zhao et al, 2018; Zubair et al, 2018 ; Bie et al, 2019 ), graphene oxide (GO) ( Chowdhury et al, 2015 ; Tan et al, 2017 ) and reduced graphene oxide (rGO) ( An et al, 2014 ; Kuai et al, 2015 ; Sim et al, 2015 ; Tan et al, 2015 ; Lin et al, 2017 ; Olowoyo et al, 2019 )), carbon nanotubes (CNTs) ( Xia et al, 2007 ; Gui et al, 2014 ; Gui et al, 2015 ; Olowoyo et al, 2018 ; Rodríguez et al, 2020 ) and carbon quantum dots (CQDs) ( Li et al, 2018 ; Wang K. et al, 2019 ) to construct TiO 2 -carbon heterojunction for photocatalytic reduction of CO 2 has been widely concerned. The unique physicochemical properties of nanocarbon that responsible for the enhanced photocatalytic performance of the S-C heterojunction can be concluded as follows: 1) the large surface area and high mechanical stability of nanocarbon could provide a stable support for the uniformly distributed TiO 2 nanoparticles with increased exposure of active sites and enhanced CO 2 adsorption capacity; 2) the high charge carrier mobility, large capacitance of nanocarbon as well as the formation of Ti-O-C bond at the highly dispersed S-C interface facilitates the migration of electrons from TiO 2 to carbon materials, thereby enhancing the separation efficiency of photogenerated e − and h + and inhibiting their recombination; 3) the optical properties of carbon materials, such as good optical transparency and wide spectrum adsorption range (especially for CQDs, expands to near IR region), contribute to the utilization of visible light of the TiO 2 -based S-C heterojunction and result in the improved quantum efficiency.…”

Section: Photoreduction Of Co 2 To Solar Fuels On Tio 2 -Based Heterojunctionsmentioning

confidence: 99%

“…In a further study, MWCNT/TiO 2 with core-shell nanostructure was demonstrated to be visible light active (due to the excellent visible light adsorption ability of CNT) that can convert CO 2 to CH 4 ( Gui et al, 2014 ). A following work carried out by this group introduced Ag nanoparticles to MWCNT/TiO 2 system (Ag-MWCNT@TiO 2 ) for the further enhanced photocatalytic performance ( Gui et al, 2015 ). In particular, the Schottky barrier between Ag and TiO 2 prevents backflow of photogenerated electrons that transferred from TiO 2 to Ag.…”

Section: Photoreduction Of Co 2 To Solar Fuels On Tio 2 -Based Heterojunctionsmentioning

confidence: 99%

Recent Advances in TiO2-Based Heterojunctions for Photocatalytic CO2 Reduction With Water Oxidation: A Review

Teng

Wang

et al. 2021

Front. Chem.

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Photocatalytic conversion of CO2 into solar fuels has gained increasing attention due to its great potential for alleviating the energy and environmental crisis at the same time. The low-cost TiO2 with suitable band structure and high resistibility to light corrosion has proven to be very promising for photoreduction of CO2 using water as the source of electrons and protons. However, the narrow spectral response range (ultraviolet region only) as well as the rapid recombination of photo-induced electron-hole pairs within pristine TiO2 results in the low utilization of solar energy and limited photocatalytic efficiency. Besides, its low selectivity toward photoreduction products of CO2 should also be improved. Combination of TiO2 with other photoelectric active materials, such as metal oxide/sulfide semiconductors, metal nanoparticles and carbon-based nanostructures, for the construction of well-defined heterostructures can enhance the quantum efficiency significantly by promoting visible light adsorption, facilitating charge transfer and suppressing the recombination of charge carriers, resulting in the enhanced photocatalytic performance of the composite photocatalytic system. In addition, the adsorption and activation of CO2 on these heterojunctions are also promoted, therefore enhancing the turnover frequency (TOF) of CO2 molecules, so as to the improved selectivity of photoreduction products. This review focus on the recent advances of photocatalytic CO2 reduction via TiO2-based heterojunctions with water oxidation. The rational design, fabrication, photocatalytic performance and CO2 photoreduction mechanisms of typical TiO2-based heterojunctions, including semiconductor-semiconductor (S-S), semiconductor-metal (S-M), semiconductor-carbon group (S-C) and multicomponent heterojunction are reviewed and discussed. Moreover, the TiO2-based phase heterojunction and facet heterojunction are also summarized and analyzed. In the end, the current challenges and future prospects of the TiO2-based heterostructures for photoreduction of CO2 with high efficiency, even for practical application are discussed.

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One-pot synthesis of Ag-MWCNT@TiO2 core–shell nanocomposites for photocatalytic reduction of CO2 with water under visible light irradiation

Cited by 79 publications

References 23 publications

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

Photocatalytic CO2 Reduction Using TiO2-Based Photocatalysts and TiO2 Z-Scheme Heterojunction Composites: A Review

Effect of Heating Rate on the Photocatalytic Activity of Ag–TiO2 Nanocomposites by One-Step Process via Aerosol Routes

Recent Advances in TiO2-Based Heterojunctions for Photocatalytic CO2 Reduction With Water Oxidation: A Review

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