Electrospun Nanofibers Embedding ZnO/Ag2CO3/Ag2O Heterojunction Photocatalyst with Enhanced Photocatalytic Activity

Rosman, Nurafiqah; Salleh, Wan Norharyati Wan; Aziz, Farhana; Ismail, Ahmad Fauzi; Harun, Zawati; Bahri, Syamsutajri Syamsol; Nagai, Kazukiyo

doi:10.3390/catal9070565

Cited by 45 publications

(33 citation statements)

References 78 publications

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“…A prerequisite for • OH formation is the valence band (VB) oxidation potential of the semiconductor to be located below the potential of • OH formation (2.38 V vs NHE, pH = 7). In the case of Ag 2 CO 3 , VB is at 2.78 V vs NHE, pH = 7 [25], suggesting the participation of • OH in EP degradation. Since the reaction takes place in the presence of oxygen, photogenerated electrons can also react with adsorbed O 2 resulting in the formation of additional oxidative species (mainly superoxide radical (O 2…”

Section: Photocatalytic Activity Of Ag 2 Comentioning

confidence: 92%

Photocatalytic Evaluation of Ag2CO3 for Ethylparaben Degradation in Different Water Matrices

Πεταλά

Nasiou

Mantzavinos

et al. 2020

Water

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The present study examines the photocatalytic properties of silver carbonate (Ag2CO3) for ethyl paraben (EP) degradation under simulated solar irradiation. Ag2CO3 was prepared according to a solution method and its physicochemical characteristics were studied by means of X-ray diffraction (XRD), the Brunauer–Emmett–Teller (BET) method, diffuse reflectance spectroscopy (DRS), and transmission electron microscopy (TEM). Complete EP (0.5 mg/L) removal was achieved after 120 min of irradiation with the use of 750 mg/L Ag2CO3 in ultrapure water (UPW), with EP degradation following pseudo-first-order kinetics. The effect of several experimental parameters was investigated; increasing catalyst concentration from 250 mg/L to 1000 mg/L led to an increase in EP removal, while increasing EP concentration from 0.25 mg/L to 1.00 mg/L slightly lowered kapp from 0.115 min−1 to 0.085 min−1. Experiments carried out with the use of UV or visible cut-off filters showed sufficient EP degradation under visible irradiation. A series of experiments were performed in real water matrices such as bottled water (BW) and wastewater (WW), manifesting Ag2CO3’s equally high photocatalytic activity for EP degradation. To interpret these results different concentrations of inorganic anions (bicarbonate 100–500 mg/L, chloride 100–500 mg/L) present in aqueous media, as well as 10 mg/L organic matter in the form of humic acid (HA), were added sequentially in UPW. Results showed accelerating effects on EP degradation for the lowest concentrations tested in all cases.

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Section: Photocatalytic Activity Of Ag 2 Comentioning

confidence: 92%

Photocatalytic Evaluation of Ag2CO3 for Ethylparaben Degradation in Different Water Matrices

Πεταλά

Nasiou

Mantzavinos

et al. 2020

Water

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“…For efficient adsorption applications, the physical features of the materials should have a great number of surface-active sites and optimized pore volume [33]. The BET method is the most widely used procedure for measuring the surface area and pore size distribution of the materials.…”

Section: Bet Analysismentioning

confidence: 99%

Porous PVA/Zn–Fe–Mn oxide nanocomposites: methylene blue dye adsorption studies

Abebe

Murthy

Zereffa

et al. 2020

Mater. Res. Express

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Adsorption is one of the noble techniques for remediation of organic and inorganic pollutants. The poly (vinyl alcohol) supported sol-gel and self-propagation routes have been used for the synthesis of porous ternary metal oxides nanocomposites. The optical, chemical bonding, crystallinity, morphological, textural, and electrochemical properties of the synthesized materials were characterized by DRS-UV-vis, FT-IR, XRD, SEM/EDX and TEM/HRTEM/SAED, BET, and CV/EIS techniques, respectively. The characterization of the nanocomposites confirmed their porous nature, high surface area, and better electrochemical properties. The synthesized nanomaterials were tested for the adsorption property of methylene blue dye. Important parameters such as the amount of PVA supported ternary metal oxide nanocomposite, pH of the solution, contact time, and concentration of methylene blue dye were optimized. For further understanding of the adsorption process, the adsorption isotherms and adsorption kinetics models were used. The adsorption tests revealed the presence of the chemisorption type of the adsorption process. several advantageous properties [8,9]. Besides, its hydroxyl groups on the carbon chain backbone act as a source for the formation of hydrogen bonding and enhances the formation of the nanocomposite [10]. As confirmed by various researchers [11][12][13][14][15][16], around 250, 300, 390, 400, and 400°C-500°C; the intramolecular decomposition, amorphous portion degradation, intermolecular breakdown, decaying of the crystalline portion of PVA, and formation of pure metal oxides had occurred, respectively.From methods used for the synthesis of inorganic nanomaterials/nanocomposites, the top-down and bottom-up approaches are common. Compared to the former, the latter is more popular and is considered as a promising route to control the growth, morphology, and properties of the nanomaterials. From the bottom-up chemical approaches; the hydrothermal, microemulsion, wet impregnation, sonochemical, ultrasonicmicrowave, electrochemical/electroless deposition, and spray-pyrolysis techniques are successfully applied. However, it is reported that these techniques follow special operating-conditions, long reaction time, lowthrough-put, and expensive procedure [17]. Therefore, it is essential to use effective and economically feasible methods such as sol-gel, precipitation, and impregnation. Furthermore, during the synthesis process, avoiding solvents that cause cancer and has mutagenic properties should also be taken into consideration [18].Considering all the mentioned aspects, this work was aimed to synthesize PVA supported ternary metal oxide nanocomposite (PVA-TMONC), using a simple and green sol-gel-self propagation technique. The methylene blue dye (MBD) adsorption efficiency of the synthesized PVA-TMONC was also tested. The physical properties of synthesized materials were characterized by critical analytical techniques. Using the Langmuir, Freundlich, Dubinin-Radushkevich (D-RK), Temkin, Flory-Huggins (FH), and Fowler-Gugge...

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“…BET Analysis. For an efficient environmental west management system, the surface-active sites and optimized pore volume of the synthesized materials are important [42]. The BET plots of single, binary, and ternary metal oxides are given in Figure S5-8.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Synthesis and Characterization of PVA-Assisted Metal Oxide Nanomaterials: Surface Area, Porosity, and Electrochemical Property Improvement

Abebe

Murthy

Zereffa

et al. 2020

Journal of Nanomaterials

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The poly(vinyl alcohol)-assisted sol-gel-self-propagation route has been used for the synthesis of porous binary metal oxide nanocomposites (BMONCs) and ternary metal oxide nanocomposites (TMONCs). The effects of synthesis techniques, precursor’s type, amount of PVA loading, and precursor’s percentage were studied. The optical, chemical bonding, crystallinity, morphological, textural, and electrochemical properties of the synthesized materials were characterized by UV-vis-DRS/UV-vis, FT-IR, XRD, SEM/EDX and TEM/HRTEM/SAED, BET, and CV/EIS techniques, respectively. The porous nature of the materials was confirmed by SEM, BET, and SAED analytical techniques. Using XRD and TEM analysis, the approximate particle size of the materials was confirmed to be in the nanometer range (~7-70 nm). The EDX and HRTEM analysis was confirming the presence of predictable composition and actuality of the composites, respectively. Moving from bare ZnO to ternary nanocomposites, the great morphological, surface area, and electrochemical property enhancement was confirmed. The charge transfer capability order was obtained to be ZnO/Fe2O3/Mn2O3 > ZnO/Fe2O3 > ZnO/Mn2O3 > ZnO. The respective approximate electron transfer resistance value is 7, 25, 61, and 65 Ω. Therefore, this work can improve the toxicity towards solvent used, surface area to volume ratio, and aggregation/agglomeration problem and also enhance the charge transfer capability due to the heterojunction.

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Electrospun Nanofibers Embedding ZnO/Ag2CO3/Ag2O Heterojunction Photocatalyst with Enhanced Photocatalytic Activity

Cited by 45 publications

References 78 publications

Photocatalytic Evaluation of Ag2CO3 for Ethylparaben Degradation in Different Water Matrices

Photocatalytic Evaluation of Ag2CO3 for Ethylparaben Degradation in Different Water Matrices

Porous PVA/Zn–Fe–Mn oxide nanocomposites: methylene blue dye adsorption studies

Synthesis and Characterization of PVA-Assisted Metal Oxide Nanomaterials: Surface Area, Porosity, and Electrochemical Property Improvement

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