Recrystallization and coalescence kinetics of TiO2 and ZnO nano-catalysts towards enhanced photocatalytic activity and colloidal stability within slurry reactors

Messaoud, Mouna; Trabelsi, Fatma; Kumari, Priyanka; Merenda, Andrea; Dumée, Ludovic F.

doi:10.1016/j.matchemphys.2020.123235

Cited by 9 publications

(3 citation statements)

References 48 publications

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“…The diffraction peaks of anatase TiO 2 displayed at 25.30, 37.88, 47.92, 62.66, 69.22, and 75.27° were attributed to the respective planes of (101), (004), (200), (204), (116), and (215) [ 31 , 32 ]. There were two diffraction peaks of rutile TiO 2 found at 54.47 and 69.78°, which were indexed as (211) and (112) planes, respectively [ 33 ]. This demonstrated that the dominant phase was anatase and the minor phase was rutile in the prepared TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

et al. 2021

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In this study, a novel cellulose/Ag/TiO2 nanocomposite was successfully synthesized via the hydrothermal method. The cellulose extracted from oil palm empty fruit bunch (OPEFB) could address the disposal issue created by OPEFB biomass. Characterization studies such as FESEM, EDX, HRTEM, XRD, FTIR, UV–Vis DRS, PL, XPS, and surface analysis were conducted. It was observed that the incorporation of cellulose could hinder the agglomeration, reduce the band gap energy to 3 eV, increase the specific surface area to 150.22 m3/g, and lower the recombination rate of the generated electron-hole pairs compared to Ag/TiO2 nanoparticles. The excellent properties enhance the sonocatalytic degradation efficiency of 10 mg/L Congo red (up to 81.3% after 10 min ultrasonic irradiation) in the presence of 0.5 g/L cellulose/Ag/TiO2 at 24 kHz and 280 W. The improvement of catalytic activity was due to the surface plasmon resonance effect of Ag and numerous hydroxyl groups on cellulose that capture the holes, which delay the recombination rate of the charge carriers in TiO2. This study demonstrated an alternative approach in the development of an efficient sonocatalyst for the sonocatalytic degradation of Congo red.

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Section: Resultsmentioning

confidence: 99%

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

et al. 2021

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“…This soft chemistry synthesis route is simple, low cost and makes it possible to have nanopowders with a size lower than 100 nm at low temperatures [ 14 , 15 ]. It also allows the control of the final properties of the elaborated powders [ 16 ]. Zinc acetate (Zn (CH3COO) 2 .2H 2 O), Zinc chloride (ZnCl 2 ), Zinc nitrate (Zn (NO 3 ) 2 .6H 2 O), and Zinc 2-ethylhexanoate (Zn (C 8 H 15 O 2 ) 2 ) are the primary precursors used in the synthesis of ZnO nanoparticles [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Up-Conversion ZnO Co-Doped (Er, Yb) Nanopowders Synthesized via the Sol-Gel Process for Photovoltaic Applications

2022

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In this study, undoped and (Erbium, Ytterbium) co-doped ZnO nanopowders were prepared using the sol-gel method and the supercritical drying of ethyl alcohol. Doping ZnO nanopowders were elaborated with 5 mol% of Er (5 Er: ZnO), 5 mol% of Er and 5 mol% of Yb (5 Er, 5 Yb: ZnO), and 5 mol% of Er and 10 mol% of Yb (5 Er, 10 Yb: ZnO) concentrations. The effects of the Yb concentration on the structural, morphological, photoluminescent, and electrical properties of the ZnO nanopowders were investigated. The main findings of this work were the crystallinization of all of the nanopowders in a hexagonal Wurtzite structure with a spheroidal morphology and a size of 60 nm. Hence, the doping concentration would affect the crystallinity and the morphology of the ZnO nanopowder. The UC (Up-Conversion) emissions were investigated under a 980 nm excitation. It was observed that (Er, Yb: ZnO) exhibited green, ranging between 525 nm and 550 nm and red up-converted emissions of 655 nm, due to the efficient energy transfer process between Er3+ and Yb3+. The absolute quantum yield percentage (QY %) of the doped nanopowders was measured as a function of power density at each up-converted emission. This would prove that (5 Er, 5 Yb: ZnO) had the highest QY percentage value of 6.31 ± 0.2% at a power density of 15.7 W/cm2. Additionally, it had the highest excited state lifetime for green and red emissions. Moreover, the Hall effect measures showed that the resistivity decreased while the electron mobility increased after doping, suggesting that most of rare earth ions were located in the interstitial positions. The carrier concentration increased after doping until (5 Er, 5 Yb: ZnO), suggesting that the Zn2+ ions substituted the RE3+ ions. Then, the carrier concentration decreased, suggesting that doping with higher concentrations would cause grain boundary defects. These findings would suggest that (5 Er, 5 Yb: ZnO) would have the best electrical properties and the lowest band gap energy (3.24 eV). Therefore, the presented preparation of the (Er, Yb: ZnO) nanopowders elaborated, using the sol-gel process would be a potential interesting material for UC applications.

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“…Titanium dioxide (TiO 2 ) is one of the most applied photocatalysts because of its highly chemical stability, relatively low cost, availability, and non-toxicity. 14 However, TiO 2 can just absorb UV light, which serves for only 5% of visible light, and has better hole-electron recombination rate because of broad optical band gap, thereby suffering from poor photoconversion efficiency. 15 Graphene has been considered as an electron mediator for the heterostructure as a means to enhance the photoelectrochemical properties of the host media and enhance the photodegradation efficiency with visible light irradiation.…”

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Z-Scheme MoS₂/TiO₂/graphene nanohybrid photocatalysts for visible light-induced degradation for highly efficient water disinfection and antibacterial activity

et al. 2022

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Recrystallization and coalescence kinetics of TiO2 and ZnO nano-catalysts towards enhanced photocatalytic activity and colloidal stability within slurry reactors

Cited by 9 publications

References 48 publications

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Efficient Up-Conversion ZnO Co-Doped (Er, Yb) Nanopowders Synthesized via the Sol-Gel Process for Photovoltaic Applications

Z-Scheme MoS₂/TiO₂/graphene nanohybrid photocatalysts for visible light-induced degradation for highly efficient water disinfection and antibacterial activity

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Recrystallization and coalescence kinetics of TiO2 and ZnO nano-catalysts towards enhanced photocatalytic activity and colloidal stability within slurry reactors

Cited by 9 publications

References 48 publications

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Efficient Up-Conversion ZnO Co-Doped (Er, Yb) Nanopowders Synthesized via the Sol-Gel Process for Photovoltaic Applications

Z-Scheme MoS2/TiO2/graphene nanohybrid photocatalysts for visible light-induced degradation for highly efficient water disinfection and antibacterial activity

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Z-Scheme MoS₂/TiO₂/graphene nanohybrid photocatalysts for visible light-induced degradation for highly efficient water disinfection and antibacterial activity