Ag2O-Ag/CAC/SiO2 composite for visible light photocatalytic degradation of cumene hydroperoxide in water

Panpa, Withaya; Jinawath, Supatra; Kashima, Dujreutai Pongkao

doi:10.1016/j.jmrt.2019.08.041

Cited by 8 publications

(6 citation statements)

References 38 publications

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“…However, modification with either Ag or Au gives rise to different optical properties: the 3%Ag-TiO 2 sample presents a broad absorption in the whole visible range, as indicated by its grayish color. This extended absorption can be attributed to the presence of Ag 2 O, which is a narrow bandgap semiconductor (1.65 eV) [30,31], in agreement with XPS results (see Table 3). Conversely, the monometallic 0.5%Au-TiO 2 shows a localized light absorption at around 530 nm (Figure 10b), which supports the formation of Au nanoparticles smaller than 5 nm diameter, in accordance with TEM images showing 2-3 nm Au NPs.…”

Section: Diffuse Reflectance Spectroscopy (Drs)supporting

confidence: 90%

Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au

et al. 2022

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Wastewaters from precious metal industries contain high amounts of noble metals, but their efficient recycling is hindered by the wastewater complex composition. Here, we propose an innovative approach for the efficient recovery of noble metals contained in these metal-enriched wastewaters as precursors for the synthesis of noble metal nanoparticles (NPs) and supported metal catalysts. Silver NPs were synthesized from Ag-enriched wastewater and then deposited on TiO2 to prepare photocatalysts. Then, further promotion of the photocatalytic activity of Ag-modified TiO2 was achieved by the addition of as little as 0.5 wt.% of Au. STEM-EDS analyses proved that Au NPs were located on Ag or AgOx nanoparticles. The contact between the two metal-containing NPs results in charge transfer effects, appreciable both in terms of oxidation states determined by XPS and of optical properties. In particular, the plasmon band of Au NPs shows photochromic effects: under UV light irradiation, bimetallic samples exhibit a blue-shift of the plasmon band, which is reversible under dark storage. The activity of the materials was tested towards ethanol photodegradation under UV light. Adding 0.5 wt.% Au NPs resulted in a promoted activity compared to Ag-TiO2, thus showing synergistic effects between Au and Ag. Ethanol was completely converted already after 1 h of UV irradiation, acetaldehyde was formed as the main oxidation product and fully degraded in less than 180 min. Notably, bimetallic samples showed ethylene formation by a parallel dehydration mechanism.

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Section: Diffuse Reflectance Spectroscopy (Drs)supporting

confidence: 90%

Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au

et al. 2022

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“…[14] The beneficial properties of silver and its ions are not limited only to their confirmed bactericide properties, recently widely investigated [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Materials, containing this element possess also definitively catalytic [41][42][43] and photocatalytic [44][45][46][47][48][49][50][51][52][53][54][55][56][57] properties. Furthermore, Bu et al [58] have proposed even hydrogen production by Ag2O based photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the electrochemical performance of Ag containing AAO layers after extended exposure to a model corrosive medium

Kozhukharov

Girginov

Kiradzhiyska

et al. 2020

J. Electrochem. Sci. Eng.

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The coating procedure appears to be an indispensable finishing stage in the production of Al based industrial products, engineering facilities and equipment. For this reason, there is an ever-increasing interest towards the elaboration of reliable corrosion protective layers with apparent coverage, adhesion, and barrier properties. In this sense, both the formation of anodized aluminum oxide (AAO) layer and its further modification with silver enable the elaboration of advanced (Al-O-Ag) films with extended beneficial characteristics. The present research activities are aimed at the determination of the corrosion protective properties of electrochemically synthesized Al-O-Ag layers on the technically pure AA1050 alloy. The structures and compositions of the obtained Al-O-Ag layers were characterized by X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). The research activities were accomplished by means of two independent electrochemical characterization methods: electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS). The electrochemical measurements were performed after 24, 168 and 672 hours of exposure to 3.5 % NaCl solution used as a model corrosive medium (MCM), in order to determine the barrier properties and durability of the elaborated Al-O-Ag layers. The analysis of the obtained results has undoubtedly shown that the proposed electrochemical Al-O-Ag layer formation can successfully be used for the creation of self-standing layers with apparent corrosion protective properties. Besides, Al-O-Ag system can be used as a basis for development of efficient protective layers suitable for application in biologically contaminated media.

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“…Then, ·O 2 − is generated and then reacted with H 2 O to form ·OH, which can be used as the MO degradation. At the same time, the holes of Ag 2 O valence band (VB) can oxidize MO directly [ 23 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

“…This is caused by the effective absorption of the incident light and reflecting the contribution of the inverted pyramid structure to improve the utilization rate of light. [23,24].…”

Section: Optical and Photothermal Propertiesmentioning

confidence: 99%

Self-Healing Hydrogel Membrane Provides a Strategy for the Steady Production of Clean Water from Organic Wastewater

Feng

Wang

et al. 2023

Membranes

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When the typical solar-driven hydrogel water evaporator treats the organic sewage, the organic pollutants will be accumulated in the evaporator and affect the evaporation performance. This issue is resolved by using silver–disulfide bonding to fix the silver oxide/silver (Ag2O/Ag) nanoparticles inside the polyacrylamide-acrylic acid hydrogel, resulting in the photocatalytic degradation of methyl orange and solar-driven water evaporation. Ag2O/Ag nanoparticles are a solar–thermal conversion material used to replace the traditional carbon material. On the one hand, the heterojunction structure of Ag2O/Ag enhances the separation ability of the photogenerated carriers, thereby increasing the photocatalytic efficiency. On the other hand, the surface of the nanoparticles is grafted with N, N′-bis(acryloyl) cystamine and becomes the crosslinking agent which is fixed in the hydrogel. Meanwhile, the inverted pyramid structure can be built at the surface of the hydrogel by soft imprinting technology. This kind of structure has excellent light trapping performance, which can increase the efficiency of Ag2O/Ag photocatalysis. Furthermore, the dynamic reversible coordination effect between Fe3+ and carboxyl realizes the self-healing capability of the hydrogel. Here are the properties of hydrogel: the fracture stress is 0.35 MPa, the fracture elongation is 1320%, the evaporation rate is 1.2 kg·m−2·h−1, and the rate of the photocatalytic degradation of methyl orange is 96% in 3 h. This self-healing hydrogel membrane provides a strategy to steadily get clean water from organic sewage.

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Ag2O-Ag/CAC/SiO2 composite for visible light photocatalytic degradation of cumene hydroperoxide in water

Cited by 8 publications

References 38 publications

Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au

Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au

Evaluation of the electrochemical performance of Ag containing AAO layers after extended exposure to a model corrosive medium

Self-Healing Hydrogel Membrane Provides a Strategy for the Steady Production of Clean Water from Organic Wastewater

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