Electrospun metal oxide–TiO2 nanofibers for elemental mercury removal from flue gas

Yuan, Yuan; Zhao, Yuemin; Li, Hailong; Yang, Li; Gao, Xiang; Chen, Zheng; Zhang, Junying

doi:10.1016/j.jhazmat.2012.05.003

Cited by 65 publications

(27 citation statements)

References 55 publications

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“…Besides, the incorporation of WO 3 into composites is able to increase the surface acidity since WO 3 is much more acidic than TiO 2 [9,[13][14][15], and the increase of surface acidity induces the high affinity of composites to those species with unpaired electrons, such as dissolved O 2 , H 2 O, OH − and organic contaminants, benefitting the generation of • O 2 − and • OH radicals and further decomposition of contaminants.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, redox reactions of W species (transformation between W 6+ and W 5+ ) in composites were deemed as another factor causing the efficient separation of hole-electron pairs [13]. As a result, WO 3 -TiO 2 composites have been extensively investigated for different purpose, particularly for photocatalytic processes [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Chang

Wang

Luo

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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h i g h l i g h t s• A series of tungsten-titaniumcocontained SBA15 composites were fabricated by a simple synthetic route.• These samples showed enhanced catalytic performance in comparison to those comprising bare tungsten or titanium component.• The enhancement of photocatalytic behavior under visible-light irradiation was discussed. t r a c tA facile and one-step hydrothermal procedure was adopted to fabricate a series of W-Ti-SBA15 composites (WTS). These as-prepared composites were systematically characterized by a collection of analytic and spectroscopic techniques. It was found that dual phases of titanium and tungsten species coexisted in mesoporous structures of p6 mm hexagonal symmetry. In addition, these composites were visible-light responsive and exhibited enhanced photocatalytic capability toward degradation of Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) upon visible-light irradiation in comparison to samples containing single component of titanium or tungsten species. Specifically, the best candidate, sample 8%WTS0.7, had the largest apparent reaction rate constant that was nearly 1.2, 2.1, 2.2, and 5.7 times as high as those of 8%WS, TS0.7, WO 3 /TiO 2 , and N-TiO 2 , respectively. The enhancement of photocatalytic performance was mainly attributed to the well-matched band structures of both components and strengthened visiblelight adsorption ability, originating from the combination of titania with highly acidic WO 3 in SBA15 matrix with large specific surface areas. Active radical species were detected by trapping experiments and a possible photocatalytic mechanism was thus proposed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Chang

Wang

Luo

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…They observed a higher visible light photocatalytic activity of heterojunction nanotubes compared with the SnO2 nanotubes and Fe2O3 nanofibers for the degradation of RhB dye upon exposure to visible light. Yuan et al (2012) have successfully demonstrated the removal of elemental mercury (Hg 0 ) from simulated coal combustion flue gases by utilizing the electrospun TiO2 nanofibers. They observed a significant reduction in mercury when utilizing TiO2 nanofibers doped with semiconducting metal oxides such as WO3, V2O5, Ag2O, In2O3 and CuO.…”

Section: Photocatalysismentioning

confidence: 99%

Perspective of electrospun nanofibers in energy and environment

Jayaraman¹,

Li²,

Kumar³

et al. 2014

Biofuel Res. J.

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HIGHLIGHTSElectrospinning is a simple, continuous and scalable technique to produce polymer composite and metal oxide nanofibers with high-aspect ratio and controlled morphologies. It possesses the added advantage of synthesizing porous, hollow and core/shell nanofibers with combination of additional polymers, metals and metal oxides for potential applications. This review focusses on the impact and role of electrospun nanofibers in improving the performances of DSSCs, photocatalysis and hydrogen generation & storage. This review summarizes the recent developments of electrospun semiconducting metal oxide/polymer composite nanostructures in energy and environment related applications. Electrospinning technique has the advantage of synthesizing nanostructures with larger surface to volume ratio, higher crystallinity with phase purity and tunable morphologies like nanofibers, nanowires, nanoflowers and nanorods. The electrospun nanostructures have exhibited unique electrical, optical and catalytic properties than the bulk counter parts as well as nanomaterials synthesized through other approaches. These nanostructures have improved diffusion and interaction of molecules, transfer of electrons along the matrix and catalytic properties with further surface modification and functionalization with combination of metals and metal oxides. GRAPHICAL ABSTRACT ARTICLE INFO ABSTRACT

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“…Morphological, optical, and electrical aspects, as well as the sensing measurements of GEM fibers in air have been reported and discussed. When designed, the resulting Hg adsorbent or absorbent material was expected to be suitable for novel Hg sensor fabrication, since a similar nanofibrous scaffold doped with AuNPs was described in the literature as a filtering system capable of adsorbing and removing Hg vapor from the environment with an efficiency of nearly 100 % (Yuan et al, 2012). In previous work (Macagnano et al, 2017(Macagnano et al, , 2015a, the authors reported a high sensitivity of the sensor capable of detecting up to dozens of ppt v despite the long time needed to reveal the analyte at these concentrations in air.…”

Section: Introductionmentioning

confidence: 99%

A smart nanofibrous material for adsorbing and detecting elemental mercury in air

et al. 2017

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Abstract. The combination of the affinity of gold for mercury and nanosized frameworks has allowed for the design and fabrication of novel kinds of sensors with promising sensing features for environmental applications. Specifically, conductive sensors based on composite nanofibrous electrospun layers of titania easily decorated with gold nanoparticles were developed to obtain nanostructured hybrid materials capable of entrapping and revealing gaseous elemental mercury (GEM) traces from the environment. The electrical properties of the resulting chemosensors were measured. A few minutes of air sampling were sufficient to detect the concentration of mercury in the air, ranging between 20 and 100 ppb, without using traps or gas carriers (LOD: 1.5 ppb). Longer measurements allowed the sensor to detect lower concentrations of GEM. The resulting chemosensors are expected to be low cost and very stable (due to the peculiar structure), requiring low power, low maintenance, and simple equipment.

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Electrospun metal oxide–TiO2 nanofibers for elemental mercury removal from flue gas

Cited by 65 publications

References 55 publications

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Enhanced visible-light-driven photocatalytic performance of mesoporous W-Ti-SBA-15 prepared through a facile hydrothermal route

Perspective of electrospun nanofibers in energy and environment

A smart nanofibrous material for adsorbing and detecting elemental mercury in air

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