The effects of bifunctional linker and reflux time on the surface properties and photocatalytic activity of CdTe quantum dots decorated KTaO3 composite photocatalysts

Bajorowicz, Beata; Nadolna, Joanna; Lisowski, Wojciech; Klimczuk, Tomasz; Zaleska-Medynska, Adriana

doi:10.1016/j.apcatb.2016.10.027

Cited by 55 publications

(26 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The BET method can be used for the characterization of various types of microporous materials including zeolites, photocatalysts, polymers, and photoelectrodes . Since MOFs can contain different sizes of micropores, from “ultramicropores” (below 7 Å) to bigger “super‐micropores” (between 7 and 20 Å) or even mesopores (above 20 Å), the obtained BET surface areas can potentially be inaccurate.…”

Section: The Agreement Between Different Types Of Bet Surface Areasmentioning

confidence: 99%

Evaluation of the BET Theory for the Characterization of Meso and Microporous MOFs

et al. 2018

View full text Add to dashboard Cite

Surface area determination with the Brunauer–Emmett–Teller (BET) method is a widely used characterization technique for metal–organic frameworks (MOFs). Since these materials are highly porous, the use of the BET theory can be problematic. Several researchers have evaluated the BET method to gain insights into the usefulness of the obtained results and interestingly, their findings are not always consistent. In this review, the suitability of the BET method is discussed for MOFs that have a diverse range of pore widths below the diameters of N2 or Ar and above 20 Å. In addition, the surface area of MOFs that are obtained by implementing different approaches, such as grand canonical Monte Carlo simulations, calculations from the crystal structures or based on experimental N2, Ar, or CO2 adsorption isotherms, are compared and evaluated. Inconsistencies in the state‐of‐the‐art are also noted. Based on the current literature, an overview is provided of how the BET method can give useful estimations of the surface areas for the majority of MOFs, but there are some crucial and specific exceptions which are highlighted in this review.

show abstract

Section: The Agreement Between Different Types Of Bet Surface Areasmentioning

confidence: 99%

Evaluation of the BET Theory for the Characterization of Meso and Microporous MOFs

et al. 2018

View full text Add to dashboard Cite

show abstract

“…These results show the combination of QDs and the TiO 2 NPs which have resulted in the formation of heterojunction structure between these two components. Furthermore, this composed interaction between TiO 2 and QDs may play an crucial role in accelerating the separation of the photogenerated charge carriers [34,38].…”

Section: Morphologymentioning

confidence: 99%

“…Furthermore, this composed interaction between TiO2 and QDs may play an crucial role in accelerating the separation of the photogenerated charge carriers [34,38].…”

Section: Morphologymentioning

confidence: 99%

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

et al. 2020

Self Cite

View full text Add to dashboard Cite

The effect of type (AgInS 2 , SnS, CuS 2 , Bi 2 S 3 ) and amount (5, 10, 15 wt%) of quantum dots (QDs) on the surface properties and photocatalytic activity of QDs-sensitized TiO 2 composite, was investigated. AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were obtained by hot-injection, sonochemical, microwave, and hot-injection method, respectively. To characterize of as-prepared samples high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and photoluminescence (PL) emission spectroscopy were applied. The size of AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were 12; 2-6; 2-3, and 1-2 nm, respectively. The QDs and QDs-sensitized TiO 2 composites obtained have been tested in toluene degradation under LEDs light irradiation (λ max = 415 nm and λ max = 375 nm). For pristine QDs the efficiency of toluene degradation increased in the order of AgInS 2 < Bi 2 S 3 < CuS < SnS under 375 nm and AgInS 2 < CuS < Bi 2 S 3 < SnS under 415 nm. In the presence of TiO 2 /SnS QDs_15% composite, 91% of toluene was degraded after 1 h of irradiation, and this efficiency was about 12 higher than that for pristine QDs under 375 nm. Generally, building the TiO 2 /AgInS 2 and TiO 2 /SnS exhibited higher photoactivity under 375 nm than the pristine TiO 2 and QDs which suggests a synergistic effect between QDs and TiO 2 matrix. Catalysts 2020, 10, 403 2 of 18 application of metal sulfides (M x S y ) for wide band semiconductors modification, because of their high charge separation efficiency and narrow band gaps, which possibly enable light harvesting at longer wavelengths [9]. Liu et al. studied the efficiency of AgInS 2 /TiO 2 heterostructures in 1,2-dichlorobenzene (o-DCB) degradation under visible light [10]. They observed that AgInS 2 /TiO 2 composites could expand the visible-light response range and greatly decreased the recombination of photogenerated electron−hole pairs in the composites. The degradation of o-DCB for the most active sample reaches about 50% after 8h of irradiation. Jang et al. prepared Ag-SnS-TiO 2 nanocomposite for methylene blue and rhodamine B degradation under simulated sunlight [11].The photoactivity of the produced photocatalysts was about 2-3 times higher than that of P25. Compared with bare TiO 2 the CuS/TiO 2 [12], CdS/TiO 2 [13-15], SnS/TiO 2 [16], Ag 2 S/TiO 2 [17,18], CuInS 2 /TiO 2 [19-21], Bi 2 S 3 /TiO 2 [22][23][24] nanocomposites present a significant improvement on photocatalytic reactions due to the decreasing recombination of electron-hole pairs and the broadened light absorption spectra. However, the metal sulfides commonly employed for TiO 2 modification have been used in nanoparticle sizes and not in quantum dots sizes. Further, it has been shown that the size of metal sulfides (MS) particles can have an impact on its physicochemical and optical properties. Recently, the literature data demonstrated that the decrease in particle size lowers the recombination of the electron-hole pair within the semiconductor particle. Quantum...

show abstract

“…38 For Kevlar/bmimCl(fd) membranes, the existence of imidazolium rings could be proved by the peaks at 3117 cm −1 and 3125 cm −1 from the C-H stretching vibration of ν(C-H) as well as the peak at 2966 cm −1 from ν(C-H) in saturated alkyl in bmim + cations. 39 For Kevlar/CdTe(fd) membranes, the peak of ν(C O) at 1712 cm −1 from tga groups surrounding CdTetga nanocrystals 40 was primarily overlapped by 1680 cm −1 from Kevlar. In our view, the similar situation has also been observed in Kevlar/PAM(fd) membranes with the overlap of characteristic peaks of ν(C O) and ν(C-N) groups.…”

Section: Fourier Transform Infraredmentioning

confidence: 99%

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

et al. 2020

View full text Add to dashboard Cite

Freeze-drying (fd) technique is an effective and facile method to accumulate nanofibers for membrane preparation, and it has been frequently reported in the development of energy materials. Kevlar as amide nanofibers (ANFs) could serve as support materials for proton exchange membranes (PEMs) owing to the merits of exceptional stiffness and strength, etc. The aim of this research is to enhance the proton conductivity of phosphoric acid (PA)-doped Kevlar membranes by incorporating polyacrylamide (PAM) and 1-butyl-3-methylimidazolium chloride (bmimCl) with freeze-drying technique. The components of PAM and bmimCl could provide the binding sites to combine PA molecules with the formation of Kevlar/PAM/bmimCl/PA membranes. Furthermore, the prepared membranes with the freeze-drying posttreatment are substantially more effective at enhancing proton conductivity owing to the combination of more PA molecules. Specifically, Kevlar/PAM/bmimCl(fd)/PA membranes showed the anhydrous proton conductivity of 2.64 × 10 −1 S/cm at 180 C and 1.04 × 10 −1 S/cm at 140 C in a 270-hour non-stop test. As regard to the prepared PA-doped Kevlar/CdTe-based membranes, the mechanical strength was far from what was expected. Comparing to the solution casting method, the freeze-drying technique was a feasible strategy to deal with ANFs for exploiting high-temperature PEMs with high performance.

show abstract

The effects of bifunctional linker and reflux time on the surface properties and photocatalytic activity of CdTe quantum dots decorated KTaO3 composite photocatalysts

Cited by 55 publications

References 72 publications

Evaluation of the BET Theory for the Characterization of Meso and Microporous MOFs

Evaluation of the BET Theory for the Characterization of Meso and Microporous MOFs

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

Enhancing proton conductivity of phosphoric acid‐doped Kevlar nanofibers membranes by incorporating polyacrylamide and 1‐butyl‐3‐methylimidazolium chloride

Contact Info

Product

Resources

About