Weak-light-driven Ag–TiO2 photocatalyst and bactericide prepared by coprecipitation with effective Ag doping and deposition

Ren, Yuanwen; Xing, Shuang; Wang, Jing; Liang, Yao; Zhao, Dongyang; Wang, Hualin; Wang, Nan; Jiang, Weiwei; Wu, Sumei; Liu, Shimin; Liu, Chaoqian; Ding, Wanyu; Zhang, Zhihua; Pang, Jifeng; Dong, C.

doi:10.1016/j.optmat.2022.111993

Cited by 18 publications

(9 citation statements)

References 66 publications

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“…The Ag-TiO 2 has many black–gray colored dots, in contrast. It is important to highlight that these TEM findings might verify the size scale of the Ag-TiO 2 NPs, as was previously recorded by XRD [ 12 , 50 , 72 ]. The energy-dispersive spectroscopy (EDS) analysis of Ag-TiO 2 /microgel composite is also displayed in Figure 11 .…”

Section: Resultssupporting

confidence: 74%

Composite Nanoarchitectonics of Photoactivated Titania-Based Materials with Anticancer Properties

et al. 2022

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The synthesis of titania-based composite materials with anticancer potential under visible-light irradiation is the aim of this study. In specific, titanium dioxide (TiO2) nanoparticles (NPs) chemically modified with silver were embedded in a stimuli-responsive microgel (a crosslinked interpenetrating network (IP) network that was synthesized by poly (N-Isopropylacrylamide) and linear chains of polyacrylic acid sodium salt, forming composite particles. The ultimate goal of this research, and for our future plans, is to develop a drug-delivery system that uses optical fibers that could efficiently photoactivate NPs, targeting cancer cells. The produced Ag-TiO2 NPs, the microgel and the composite materials were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), micro-Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS) and transmission electron microscopy (TEM). Our results indicated that Ag-TiO2 NPs were successfully embedded within the thermoresponsive microgel. Either Ag-TiO2 NPs or the composite materials exhibited high photocatalytic degradation efficiency on the pollutant rhodamine B and significant anticancer potential under visible-light irradiation.

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Section: Resultssupporting

confidence: 74%

Composite Nanoarchitectonics of Photoactivated Titania-Based Materials with Anticancer Properties

et al. 2022

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“…The marked crystal plane spacing of 0.351 nm is indexed to the anatase (101) crystal plane [21,37]. The lattice fringe of 0.228 nm can be ascribed to the crystal face of Ag (111) [38,39], indicating that Ag element exists as metallic Ag, which is consistent with the XRD results. Figure 4 shows the N2 adsorption-desorption isotherms of PT, TM and 1-ATM.…”

Section: Morphology and Bet Surface Areasupporting

confidence: 83%

Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites

et al. 2023

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Ag/TiO2/muscovite (ATM) composites were prepared by the sol–gel method and the effects of Ag modification on the structure and photocatalytic performance were investigated. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller surface area (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FTIR), photoluminescence spectra (PL) and ultraviolet–visible diffuse reflectance spectra (DRS). The photocatalytic activity of the obtained composites was evaluated by taking 100 mL (10 mg/L) of Rhodamine B (RhB) aqueous solution as the target pollutant. The muscovite (Mus) loading releases the agglomeration of TiO2 particles and the specific surface area increases from 17.6 m2/g (pure TiO2) to 39.5 m2/g (TiO2/Mus). The first-order reaction rate constant increases from 0.0009 min−1 (pure TiO2) to 0.0074 min−1 (150%TiO2/Mus). Ag element exists in elemental silver. The specific surface area of 1-ATM further increases to 66.5 m2/g. Ag modification promotes the separation of photogenerated electrons and holes and increases the visible light absorption. 1%Ag-TiO2/Mus (1-ATM) exhibits the highest photocatalytic activity. After 100 min, the rhodamine B (RhB) degradation degrees of PT, 150%TiO2/Mus and 1-ATM are 10.4%, 48.6% and 90.6%, respectively. The first-order reaction rate constant of 1-ATM reaches 0.0225 min−1, which is 25 times higher than that of pure TiO2.

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“…The FTIR spectrum of Au@TiO 2 ( Figure S4 ) shows absorption bands at 1345–1625 and 3342 cm –1 , which are ascribed to Ti-OH and the absorbed water, respectively. 43 − 46 Also, the absorption bands at 400–700 cm –1 were ascribed to TiO 2 . 43 − 46 Figure S5 shows the chemical compositions of the Au(1%)@TiO 2 composite investigated by XPS.…”

Section: Resultsmentioning

confidence: 98%

“… 43 − 46 Also, the absorption bands at 400–700 cm –1 were ascribed to TiO 2 . 43 − 46 Figure S5 shows the chemical compositions of the Au(1%)@TiO 2 composite investigated by XPS. In the Ti2p spectrum ( Figure S5a ), two peaks were observed at 464.5 and 459.0 eV, which are attributed to Ti2p 1/2 and Ti2p 3/2 , respectively.…”

Section: Resultsmentioning

confidence: 98%

“…From these results, TiO 2 worked as a support, where the Au ions were dispersed. The FTIR spectrum of Au@TiO 2 (Figure S4) shows absorption bands at 1345–1625 and 3342 cm –1 , which are ascribed to Ti-OH and the absorbed water, respectively. − Also, the absorption bands at 400–700 cm –1 were ascribed to TiO 2 . − Figure S5 shows the chemical compositions of the Au(1%)@TiO 2 composite investigated by XPS. In the Ti2p spectrum (Figure S5a), two peaks were observed at 464.5 and 459.0 eV, which are attributed to Ti2p 1/2 and Ti2p 3/2 , respectively. The XPS O1s spectrum (Figure S5b) shows a peak at 529.9, which is attributed to titanium oxide …”

Section: Resultsmentioning

confidence: 99%

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Base-Free Synthesis and Photophysical Properties of New Schiff Bases Containing Indole Moiety

et al. 2022

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Schiff bases represent an essential class in organic chemistry with antitumor, antiviral, antifungal, and antibacterial activities. The synthesis of Schiff bases requires the presence of an organic base as a catalyst such as piperidine. Base-free synthesis of organic compounds using a heterogeneous catalyst has recently attracted more interest due to the facile procedure, high yield, and reusability of the used catalyst. Herein, we present a comparative study to synthesize new Schiff bases containing indole moieties using piperidine as an organic base catalyst and Au@TiO 2 as a heterogeneous catalyst. In both methods, the products were isolated in high yields and fully characterized using different spectral analysis techniques. The catalyst was reusable four times, and the activity was slightly decreased. The presence of Au increases the number of acidic sites of TiO 2 , resulting in C=O polarization. Yields of the prepared Schiff bases in the presence of Au@TiO 2 and piperidine were comparable. However, Au@TiO 2 is an easily separable and recyclable catalyst, which would facilitate the synthesis of organic compounds without applying any hazardous materials. Furthermore, the luminescence behavior of the synthesized Schiff bases exhibited spectral shape dependence on the substituent group. Interestingly, the compounds also displayed deep-blue fluorescence with Commission Internationale de l’Éclairage (CIE) coordinates of y < 0.1. Thus, these materials may contribute to decreasing the energy consumption of the emitting devices.

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Weak-light-driven Ag–TiO2 photocatalyst and bactericide prepared by coprecipitation with effective Ag doping and deposition

Cited by 18 publications

References 66 publications

Composite Nanoarchitectonics of Photoactivated Titania-Based Materials with Anticancer Properties

Composite Nanoarchitectonics of Photoactivated Titania-Based Materials with Anticancer Properties

Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites

Base-Free Synthesis and Photophysical Properties of New Schiff Bases Containing Indole Moiety

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