Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: Effect of alkaline aqueous electrolyte concentration

Jusoh, Norela; Jalil, Aishah Abdul; Triwahyono, Sugeng; Karim, Ainul Hakimah; Salleh, Nur Fatien Muhamad; Annuar, N.H.R.; Jaafar, Nur Farhana; Firmansyah, M.L.; Mukti, Rino R.; Ali, Mohamad Wijayanuddin

doi:10.1016/j.apsusc.2014.12.192

Cited by 43 publications

(10 citation statements)

References 45 publications

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“…20,40 This result supported FTIR analysis when the Ti-O-Ti and Si-O-H network led to a decrease in number peaks, suggesting that the substitution of Nb ions on both band networks was responsible for the growth occurrences. 41,42 Fig . S4 depicts the DRS of pristine FST and Nb-loaded FST.…”

Section: Catalyst Characterization Morphological and Structural Analysesmentioning

confidence: 99%

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Zakaria

Hassan

Ibrahim

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Heterogeneous photocatalysis has been demonstrated to be a promising alternative to treating emerging pollutants in wastewater. Phenol, an extremely toxic substance among existing pollutants, can cause long‐term unintended effects when improperly disposed. An effective measure to address this problem is to develop suitable heterojunctions. Among various photocatalyst, titanium dioxide (TiO2) appears to be an excellent photocatalyst in the degradation of organic pollutants. RESULTS Synthetization of well‐constructed heterojunction composite of niobium oxide (Nb2O5) and fibrous silica titania (FST) for enhanced photocatalytic degradation of phenol has been investigated. The photocatalytic performance demonstrated that 5 wt% Nb2O5 loaded on FST (5 Nb/FST) gave the maximum phenol degradation rate (1.70 × 10−2 mM min−1) of 10 mg L−1 phenol at pH 5 using 1000 mg L−1 catalyst within 180 min. Meanwhile, under the same conditions, 1 Nb/FST, FST, 10 Nb/FST and Nb2O5 only delivered 1.51 × 10−2, 1.30 × 10−2, 1.01 × 10−2 and 0.07 × 10−2 mM min−1, respectively. Further phenol photocatalytic degradation routes by 5 Nb/FST reveal that the main intermediates detected are hydroquinone, catechol, maleic, fumaric, and malonic acid. CONCLUSION In this work, 5 Nb2O5/FST composite, as an effective‐performance photocatalyst for phenol degradation, was well‐constructed. The advanced activity can primarily be attributed to the regulated Nb2O5 loading with FST and the effect of Nb/FST microsphere heterojunctions, synergistically. Besides, larger crystallite size, high impurity levels and Si‐O‐Nb and Nb–O–Ti bonds, offers excellent phenol degradation. © 2020 Society of Chemical Industry (SCI)

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Section: Catalyst Characterization Morphological and Structural Analysesmentioning

confidence: 99%

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Zakaria

Hassan

Ibrahim

et al. 2020

J of Chemical Tech & Biotech

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“…Accordingly, it is proposed that an electron-hole pair is generated in both ZnO and TiO2 sites upon irradiation of ZnO/TiO2. The high potential and negativity of eat the CB are capable to reduce O2 to enable the formation of superoxide radical •O2 - [24]. Some of the eat CB of ZnO might be transferred to the CB of TiO2.…”

Section: Figure 2 Catalytic Performances For Desulfurization Of Dibenzothiophenementioning

confidence: 99%

Synthesis of Zinc Oxide Supported on Titanium Dioxide for Photocatalytic Oxidative Desulfurization of Dibenzothiophene

Hitam

Jalil

Triwahyono

2018

JEST

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Photocatalytic oxidative desulfurization (PODS) has received much attention due to low energy consumption and high efficiency, as well as simple and pollution-free operation. In this study, zinc oxide supported on titanium dioxide (ZnO/TiO2) catalysts were prepared via a simple electrochemical method. The presence of anatase phase TiO2 and wurtzite ZnO was confirmed by X-ray diffraction (XRD) analysis while band gap energies were determined by UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic activity was tested for desulfurization of 100 mg/L dibenzothiophene (DBT). The highest desulfurization rate (2.20 × 10-3 mM/min) was achieved using 1 g/L of 10 wt% ZnO/TiO2 after 2 hr under UV irradiation.

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“…The essential specifications of appropriate support for an electrocatalyst of the fuel cell in DMFC conditions are good electrical conductivity, high surface area, and adequate porosity to enable a good reactant flow and high chemical stability. Nowadays, mesostructured silica nanoparticles (MSN) have attracted substantial attention due to its properties of high surface area (>1000 m 2 g −1 ), good chemical and mechanical stability in terms of resistant to corrosion, and high porosity, which is suitable as catalyst support materials [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2A-F displays micrographs with the magnification of 30 kX for electrocatalysts of MSN, Pd black, Pd-MSN, Ni-MSN, NiPd-C, and NiPd-MSN, respectively.It can be seen that the spherical shape of the MSN was sustained with Ni, Pd, and NiPd loaded onto MSNs and the metal particles filled up some of the pores and were well-dispersed on the support of MSN powder. However, when the Ni, Pd, and NiPd were added, the shape of MSN was slightly reduced and less aggregated[21]. The bigger pore diameter of NiPd-MSN can be observed compared to bare MSN (Supplementary Materials FigureS1).…”

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confidence: 99%

NiPd Supported on Mesostructured Silica Nanoparticle as Efficient Anode Electrocatalyst for Methanol Electrooxidation in Alkaline Media

et al. 2020

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The direct methanol fuel cell (DMFC) is a portable device and has the potential to produce 10 times higher energy density than lithium-ion rechargeable batteries. It is essential to build efficient methanol electrooxidation reaction electrocatalysts for DMFCs to achieve their practical application in future energy storage and conversion. A catalyst consisting of nickel–palladium supported onto mesostructured silica nanoparticles (NiPd–MSN) was synthesized by the wet impregnation method, while MSN was synthesized using the sol-gel method. MSN act as a catalyst support and has very good characteristics for practical support due to its large surface area (>1000 m2/g) and good chemical and mechanical stability. The microstructure and catalytic activity of the electrocatalysts were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), Brunauer–Emmet–Teller (BET) theory, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), and chronoamperometry (CA). XRD showed that the NiPd–MSN electrocatalysts had a high crystallinity of PdO and NiO, while FESEM displayed that NiPd was dispersed homogeneously onto the high surface area of MSN. In alkaline media, the catalytic activity toward the methanol oxidation reaction (MOR) of NiPd–MSN demonstrated the highest, which was 657.03 mA mg−1 more than the other electrocatalysts. After 3600 s of CA analysis at −0.2 V (vs. Ag/AgCl), the MOR mass activity of NiPd–MSN in alkaline media was retained at a higher mass activity of 190.8 mA mg−1 while the other electrocatalyst was significantly lower than that. This electrocatalyst is a promising anode material toward MOR in alkaline media.

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Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: Effect of alkaline aqueous electrolyte concentration

Cited by 43 publications

References 45 publications

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Synthesis of Zinc Oxide Supported on Titanium Dioxide for Photocatalytic Oxidative Desulfurization of Dibenzothiophene

NiPd Supported on Mesostructured Silica Nanoparticle as Efficient Anode Electrocatalyst for Methanol Electrooxidation in Alkaline Media

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