Bifunctional Au@TiO2 core–shell nanoparticle films for clean water generation by photocatalysis and solar evaporation

Huang, Jian; He, Yurong; Wang, Li; Huang, Yimin; Jiang, Baocheng

doi:10.1016/j.enconman.2016.11.053

Cited by 174 publications

(65 citation statements)

References 39 publications

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“…The redshift of the TiO 2 /AuNP absorption peak is caused by the larger refractive index of the TiO 2 (2.52 for anatase TiO 2 as compared to 1 for air) [27]. The broader absorption peak is due to the modification of electronic states which caused by the heterojunction-induced charge transfer interaction [29]. It also indicates that the TiO 2 is in anatase crystalline phase, which is consistent with the result in XRD spectra results [32].…”

Section: Photocatalytic Degradation Experimentssupporting

confidence: 77%

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Microfluidic Reactors for Plasmonic Photocatalysis Using Gold Nanoparticles

et al. 2019

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This work reports a microfluidic reactor that utilizes gold nanoparticles (AuNPs) for the highly efficient photocatalytic degradation of organic pollutants under visible light. The bottom of microchamber has a TiO 2 film covering a layer of AuNPs (namely, TiO 2 /AuNP film) deposited on the F-doped SnO 2 (FTO) substrate. The rough surface of FTO helps to increase the surface area and the AuNPs enables the strong absorption of visible light to excite electron/hole pairs, which are then transferred to the TiO 2 film for photodegradation. The TiO 2 film also isolates the AuNPs from the solution to avoid detachment and photocorrosion. Experiments show that the TiO 2 /AuNP film has a strong absorption over 400-800 nm and enhances the reaction rate constant by 13 times with respect to the bare TiO 2 film for the photodegradation of methylene blue. In addition, the TiO 2 /AuNP microreactor exhibits a negligible reduction of photoactivity after five cycles of repeated tests, which verifies the protective function of the TiO 2 layer. This plasmonic photocatalytic microreactor draws the strengths of microfluidics and plasmonics, and may find potential applications in continuous photocatalytic water treatment and photosynthesis. The fabrication of the microreactor uses manual operation and requires no photolithography, making it simple, easy, and of low cost for real laboratory and field tests.2 of 11 resonance (LSPR) due to the collective oscillation of free electrons in response to the excitation of irradiant light. The LSPR effect can drastically enhance the visible response of TiO 2 photocatalysis for solar energy capture, environmental redemption, and selective organic photosynthesis [5,7,9,10]. Moreover, the direct physical contact of the noble metal NPs and the TiO 2 photocatalysts would form a Schottky junction to suppress the recombination of electron-hole pairs [8,11].Typical photodegradation systems involve the suspension of TiO 2 nanopowders in an aqueous solution of a bulky container. With the stirring, the TiO 2 nanopowders have full contact with the dissolved organic pollutants, resulting in a large specific surface area (SSA, defined as the total surface area per unit of mass) and high photodegradation efficiency. However, the suspended TiO 2 nanopowders absorb and scatter light, causing rapid decay, and thus an uneven distribution of the irradiant light. What is more problematic is the requirement of post processing, namely the nanopowders have to be separated from the solution after the reaction [12][13][14]. To avoid these problems, immobilized systems have been developed to fix the TiO 2 photocatalysts on a support, but they tend to have a small SSA and low efficiency [15].Microfluidic reactors have attracted much attention and have been proposed to tackle the drawbacks of photocatalytic processes [14,[16][17][18][19][20]. They inherit many advantages from microfluidics technology, such as small dimensions, high surface-to-volume (S/V) ratio, easy control of flow rates, short molecular diffusion distance,...

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Section: Photocatalytic Degradation Experimentssupporting

confidence: 77%

“…The peaks at 2θ = 37.8°, 44.39°, and 64.58° are the crystal planes of Au (JCPDS file no. 04-0784) [29,30]. Figure 4 shows the X-ray diffraction (XRD) patterns of annealed TiO2/AuNP film, indicating that the as-prepared nanocomposite is polycrystalline.…”

Section: Photocatalytic Degradation Experimentsmentioning

confidence: 99%

Microfluidic Reactors for Plasmonic Photocatalysis Using Gold Nanoparticles

et al. 2019

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“…When applied for the detection of CEA, a commonly used clinical biomarker associated with various types of cancer, the assay displayed a linear dependence for 0–100 ng∙mL −1 range and an LOD of 5.66 ng∙mL −1 which is encouraging since in most individuals with cancer, CEA is often in the range from several to hundreds of ng∙mL −1 . The group of Yang [ 52 ] showed that colorimetric immunosensing can be successfully applied for the detection of Amyloid β (Aβ), a key predictor of Alzheimer’s disease (AD). Specifically, AuNPs coated with N- or C-terminal antibody captured simultaneously Aβ inducing aggregation of NPs and a change of solution color from red to blue.…”

Section: Optical Plasmonic Biosensors For Smart Disease Diagnosticmentioning

confidence: 99%

Surface Plasmon Resonance or Biocompatibility—Key Properties for Determining the Applicability of Noble Metal Nanoparticles

et al. 2017

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Metal and in particular noble metal nanoparticles represent a very special class of materials which can be applied as prepared or as composite materials. In most of the cases, two main properties are exploited in a vast number of publications: biocompatibility and surface plasmon resonance (SPR). For instance, these two important properties are exploitable in plasmonic diagnostics, bioactive glasses/glass ceramics and catalysis. The most frequently applied noble metal nanoparticle that is universally applicable in all the previously mentioned research areas is gold, although in the case of bioactive glasses/glass ceramics, silver and copper nanoparticles are more frequently applied. The composite partners/supports/matrix/scaffolds for these nanoparticles can vary depending on the chosen application (biopolymers, semiconductor-based composites: TiO2, WO3, Bi2WO6, biomaterials: SiO2 or P2O5-based glasses and glass ceramics, polymers: polyvinyl alcohol (PVA), Gelatin, polyethylene glycol (PEG), polylactic acid (PLA), etc.). The scientific works on these materials’ applicability and the development of new approaches will be targeted in the present review, focusing in several cases on the functioning mechanism and on the role of the noble metal.

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“…Extensive research efforts have been devoted to technologies for freshwater generation. [ 1–7 ] Technologies like reverse osmosis by microfilter membrane and thermal distillation (e.g., in power plant) are developed for mass production of freshwater in centralized systems with energy‐intensive processes. [ 8,9 ] However, most of the areas lacking fresh water are in developing countries and have very limited access to intensive energy that powers centralized systems.…”

Section: Introductionmentioning

confidence: 99%

Functionalized MXene Enabled Sustainable Water Harvesting and Desalination

Fei

Koh

et al. 2020

Advanced Sustainable Systems

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Solar irradiation is a promising resource for sustainable energy conversion and storage in many technological fields. Interfacial solar steam generator is emerging as a sustainable system for water harvesting under natural solar irradiance. However, natural sunlight is usually insufficient for conventional interfacial (2D absorber) solar steam generators to achieve high solar steam efficiency (>85%). Herein, a functionalized MXene‐polymeric membrane‐based solar steam generator in a heat localization structure is reported as an efficient water harvesting and desalination system. The functionalized MXene flakes are homogeneously dispersed and encapsulated in polymeric networks of cellulose acetate in the crosslinking process, where water is automatically pumped through the absorber in the embedded nano/micro channels. As such, the fabricated solar steam generator shows a net evaporation rate (with respect to that in the dark condition) of 1.47 kg m−2 h−1 with 92.1% efficiency under 1 sun illumination. Moreover, the salt rejection rate for high salinity seawater (original Na+ concentration is 18 000 mg L−1) reaches up to 97.5%, generating drinkable water that meets the WHO standard. The new photothermal membrane absorber is cost‐effective, scalable, washable, and stable under harsh conditions; holding great promise for practical solar desalination applications.

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Bifunctional Au@TiO2 core–shell nanoparticle films for clean water generation by photocatalysis and solar evaporation

Cited by 174 publications

References 39 publications

Microfluidic Reactors for Plasmonic Photocatalysis Using Gold Nanoparticles

Microfluidic Reactors for Plasmonic Photocatalysis Using Gold Nanoparticles

Surface Plasmon Resonance or Biocompatibility—Key Properties for Determining the Applicability of Noble Metal Nanoparticles

Functionalized MXene Enabled Sustainable Water Harvesting and Desalination

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