Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

Akel, Soukaina; Dillert, Ralf; Balayeva, Narmina O.; Boughaled, Redouan; Koch, Julian; Azzouzi, Mohammed; Bahnemann, Detlef W.

doi:10.3390/catal8120647

Cited by 64 publications

(41 citation statements)

References 51 publications

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“…The peaks are found at ~367.4 eV and ~373.4 eV (Fig. 3b) can be assigned to Ag3d 5/2 and Ag3d 3/2 , respectively and also the characteristic peaks of Ag + for Ag 2 O in ZSO nanocomposite [8,12]. Therefore, the XPS result is well supported the XRD data and confirmed the formation of ZnO-Ag 2 O (ZSO) nanocomposite.…”

Section: Materials Properties Of Nanocompositessupporting

confidence: 69%

Effect of Ag2O on cell viability of ZnO nanoparticle synthesized by low temperature solution synthesis process

2019

Biointerface Res Appl Chem

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The synthesis, characterization and biomedical applications of mixed metal oxide is receiving increasing interest due to their property related specific applications.In this regard, ZnO and Ag2O have been applied for different biomedical applications individually but the effect of Ag2O on cell viability of ZnO has not been reported yet. The objective of this study is to see the effect of Ag2O nanoparticle on cell viability of ZnO nanoparticles synthesized by adopting a two-step low temperature solution process. X-ray diffraction study confirms the co-existence of ZnO and Ag2O phases. Transmittance electron microscopy has been used to characterize the morphological properties of the samples. X-ray photoelectron spectroscopic analysis also confirms the formation of ZnO-Ag2O nanocomposite. The in vitro cytotoxicity with the help of MTT assay (upto a maximum of 200 μg/mL) on HeLa cell line approves thatthe ZnO-Ag2O (ZSO) nanocomposite is more biocompatible than the individual ZnO and Ag2O nanoparticle. This nanocomposite ZSO can be used as a vehicle for drug delivery systems.

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Section: Materials Properties Of Nanocompositessupporting

confidence: 69%

Effect of Ag2O on cell viability of ZnO nanoparticle synthesized by low temperature solution synthesis process

2019

Biointerface Res Appl Chem

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“…Based on previous works, Ag 2 O was used as a co-catalyst for increasing photocatalytic activity, because it can reduce charge recombination. The electrons can be excited to a conduction band of TiO 2 , and the hole can be left at the valence band of Ag 2 O, leading it to promote an interfacial electron transfer [25][26][27]. XRD patterns of TiO 2 (40%)/ZeY (unloaded); and 0.5, 1, 3, and 5 wt.…”

Section: Effect Of Ratio Of Sio 2 :Al 2 O 3 In Zeymentioning

confidence: 99%

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

2020

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TiO2-based photocatalysts synthesized by the microwave-assisted sol-gel method was tested in the photocatalytic glucose conversion. Modifications of TiO2 with type-Y zeolite (ZeY) and metals (Ag, Cu, and Ag-Cu) were developed for increasing the dispersion of TiO2 nanoparticles and increasing the photocatalytic activity. Effects of the TiO2 dosage to zeolite ratio (i.e., TiO2/ZeY of 10, 20, 40, and 50 mol %) and the silica to alumina ratio in ZeY (i.e., SiO2:Al2O3 of 10, 100, and 500) were firstly studied. It was found that the specific surface area of TiO2/ZeY was 400–590 m2g−1, which was higher than that of pristine TiO2 (34.38 m2g−1). The good properties of 20%TiO2/ZeY photocatalyst, including smaller particles (13.27 nm) and high surface area, could achieve the highest photocatalytic glucose conversion (75%). Yields of gluconic acid, arabinose, xylitol, and formic acid obtained from 20%TiO2/ZeY were 9%, 26%, 4%, and 35%, respectively. For the effect of the silica to alumina ratio, the highest glucose conversion was obtained from SiO2:Al2O3 ratio of 100. Interestingly, it was found that the SiO2:Al2O3 ratio affected the selectivity of carboxylic products (gluconic acid and formic acid). At a low ratio of silica to alumina (SiO2:Al2O3 = 10), higher selectivity of the carboxylic products (gluconic acid = 29% and formic acid = 32%) was obtained (compared with other higher ratios). TiO2/ZeY was further loaded by metals using the microwave-assisted incipient wetness impregnation technique. The highest glucose conversion of 96.9 % was obtained from 1 wt. % Ag-TiO2 (40%)/ZeY. Furthermore, the bimetallic Ag-Cu-loaded TiO2/ZeY presented the highest xylitol yield of 12.93%.

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“…MIL-101 and CuNi/MIL-101 presented similar XRD patterns (Figure 3a), thereby proving the preservation of the crystal structures of MIL-101 after loading of the Cu-Ni nanoparticles [26,27]. Based on the XRD patterns, only the rutile phase was observed in TiO2 (Figure 3b) [28,29]. The main diffraction peak of TiO2 was revealed at 2θ = 27.7°, which represents the rutile (110) phase [28].…”

Section: Introductionmentioning

confidence: 63%

“…Based on the XRD patterns, only the rutile phase was observed in TiO2 (Figure 3b) [28,29]. The main diffraction peak of TiO2 was revealed at 2θ = 27.7°, which represents the rutile (110) phase [28]. The XRD patterns of TiO2 showed no peak corresponding to the anatase (101) phase at 2θ = 25.3° [29].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Bimetallic Cu–Ni Nanoparticle-Supported Catalysts in the Selective Oxidation of Benzyl Alcohol to Benzaldehyde

et al. 2019

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Three bimetallic Cu–Ni nanoparticle-supported catalysts were synthesized by co-immobilization followed by H2 reduction. A chromium(III) terephthalate metal organic framework (MIL-101), titanium dioxide (TiO2), and carbon (C) with different properties (acidity and Brunauer–Emmett–Teller surface area) were selected as supports for studying the effect of the support nature on the catalytic activity and selectivity in the oxidation of benzyl alcohol. The physicochemical properties of the Cu–Ni-supported catalysts were characterized by XRD, NH3-TPD, nitrogen adsorption/desorption, TEM, EDS, XPS, and ICP-OES. Bimetallic Cu–Ni nanoparticles were highly dispersed on the support. The catalytic activities of CuNi/MIL-101, CuNi/TiO2, and CuNi/C were tested in the selective oxidation of benzyl alcohol to benzaldehyde in the presence of molecular oxygen under mild reaction conditions. The highest benzaldehyde yields were achieved with CuNi/TiO2, CuNi/MIL-101, and CuNi/C catalysts at 100 °C within 4 h under 5, 3, and 3 bar of O2, respectively. The bimetallic Cu–Ni-supported catalysts possessed two types of catalytic active sites: acid sites and bimetallic Cu–Ni nanoparticles. The CuNi/MIL-101 catalyst possessed a high number of acid sites and exhibited high yield during selective benzyl alcohol oxidation to benzaldehyde. Importantly, the catalysts exhibited a high functional group (electron-donating and electron-withdrawing groups) tolerance. Cu–Ni-supported catalysts with an Cu:Ni mole ratio of 1:1 exhibited the highest yield of 47% for the selective oxidation of benzyl alcohol to benzaldehyde. Reusability and leaching experiment results exhibited that CuNi/MIL-101 showed better stability than CuNi/TiO2 and CuNi/C catalysts due to the large porous cavities of MIL-101 support; these cavities can be used to trap bimetallic Cu–Ni nanoparticles and inhibit nanoparticle leaching.

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Ag/Ag2O as a Co-Catalyst in TiO2 Photocatalysis: Effect of the Co-Catalyst/Photocatalyst Mass Ratio

Cited by 64 publications

References 51 publications

Effect of Ag2O on cell viability of ZnO nanoparticle synthesized by low temperature solution synthesis process

Effect of Ag2O on cell viability of ZnO nanoparticle synthesized by low temperature solution synthesis process

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Heterogeneous Bimetallic Cu–Ni Nanoparticle-Supported Catalysts in the Selective Oxidation of Benzyl Alcohol to Benzaldehyde

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