High-performance photocatalytic WO3 nanoparticles for treatment of acidic wastewater

Abbaspoor, Mahboobeh; Aliannezhadi, Maryam; Tehrani, Fatemeh Shariatmadar

doi:10.1007/s10971-022-06002-9

Cited by 18 publications

(5 citation statements)

References 29 publications

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“…For samples calcined at temperatures above 600 °C, the absorbance peak is found to be slightly red shifted. This can be attributed to the increase in particle size from nanometer to micrometer range (as verified earlier from FESEM images) and the corresponding reduction in the bandgap energy of the material [33]. Bandgap values of all the synthesized samples are obtained using Kubelka-Munk (KM) model defined by,…”

Section: Optical Propertiesmentioning

confidence: 65%

Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination

Nair,

Keerthana,

James

et al. 2023

Phys. Scr.

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Present work primarily aims to study the near infrared (NIR) reflecting property of tungsten oxide nanostructures synthesized using hydrothermal method. As-synthesized hydrated tungsten oxide (WO3. H2O) sample was subjected to calcination at temperatures 300, 600, 700, 800 and 900 °C respectively for 1 hour and corresponding NIR reflecting performance of the obtained anhydrous tungsten oxide (WO3) nanostructures was analyzed using spectrophotometer. Thermal, structural, morphological, compositional and photoluminescence properties of the nanostructures were also characterized. Moreover, color variation of all samples was identified using CIE L*a*b* color analysis. The sample calcined at 600 °C showed a remarkable NIR reflectance of 91 % with color coordinates L* = 70.21, a* = - 4.28, b* = 22.47, h* = 100.78°, and C* = 22.87. Particle size and oxygen vacancies were found to play a significant role in NIR reflectance ability of tungsten oxide. The present work provides new insight into developing NIR reflecting tungsten oxide powders to be used as environmentally friendly cool materials for buildings and automobiles with energy saving performance.

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Section: Optical Propertiesmentioning

confidence: 65%

Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination

Nair,

Keerthana,

James

et al. 2023

Phys. Scr.

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“…To determine the direct and indirect bandgap values of the alumina nanoparticles, Tauc method (Eq. 5 ) can be used 43 , 44 . where E, B, and E g are photon energy, a constant, and the material bandgap, respectively.…”

Section: Resultsmentioning

confidence: 99%

High specific surface area γ-Al2O3 nanoparticles synthesized by facile and low-cost co-precipitation method

Gholizadeh

Aliannezhadi

Ghominejad

et al. 2023

Sci Rep

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Alumina (Al2O3) nanoparticles (NPs) are particularly adsorbent NPs with a high specific surface area (SSA) that may well be utilized to clean water. In this study, pure γ-alumina NPs are successfully synthesized by the co-precipitation method, and the effect of ammonium bicarbonate concentration on the synthesized NPs is studied to find the optimum concentration to provide the highest capacity of copper ions removal from water. The results declare that spherical alumina NPs with average diameters in the range of 19–23 nm are formed with different concentrations of precipitation agent, and the concentration has no significant effect on the morphology of NPs. Furthermore, the precipitating agent concentration influences the optical characteristics of the produced alumina NPs, and the bandgap energies of the samples vary between 4.24 and 5.05 eV. The most important impact of precipitating agent concentrations reflects in their SSA and capacity for copper ion removal Ultra-high SSA = 317 m2/g, and the highest copper removal at the adsorbate concentration of 184 mg/L is achieved in an alkalis solution followed by a neutral solution. However, admirable copper removal of 98.2% is even achieved in acidic solutions with 0.9 g/L of the alumina NPs synthesized at a given concentration of ammonium bicarbonate, so this sample can be a good candidate for Cu ions removal from acidic wastewater.

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“…There are four basic steps in the photocatalysis of pollutants: (1) absorption of light having an energy greater than the band gap of semiconductor material to form electron–hole pairs (excitons), (2) separation of excitons, (3) migration of electrons and holes to the surface of the semiconductor, and (4) the charged electrons and holes participating in the redox processes (electrons are utilized in reduction, and holes are utilized in oxidation process). − In recent decades, transition metal oxides such as ZrO 2 , CuO, WO 3 , ZnO, and TiO 2 are the well-known photocatalysts that generate the redox reactions at their surfaces when stimulated by the UV–visible light irradiation appropriate to their band gap energy. ,, Among them, TiO 2 is the most effective in photocatalytic splitting of water and photodegradation of organic pollutants and has good antibacterial activity …”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of TiO₂ Using Impatiens rothii Hook.f. Leaf Extract for Efficient Removal of Methylene Blue Dye

Yitagesu,

Leku,

Workneh

2023

ACS Omega

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In this work, TiO2 nanoparticles (NPs) were effectively synthesized by a green method using the Impatiens rothii Hook.f. leaf (IL) extract as a capping and reducing agent. The as-synthesized TiO2 NPs were characterized by different characterization methods such as the Brunauer–Emmett–Teller (BET) analysis, high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), diffused reflectance spectroscopy (DRS), and X-ray diffraction (XRD) and Raman spectroscopy. The specific surface area from BET analysis was found to be 65 m2/g. The average crystallite size from XRD analysis and average particle size from SEM analysis were found to be ∼11 and ∼25 nm, respectively. The Raman spectroscopy and XRD results showed that the biosynthesized (IL–TiO2) nanoparticles were purely anatase phase. XPS analysis illustrated the formation of Titania with an oxidation state of +4. The DRS study showcased that a blue-shifted intense absorption peak of IL–TiO2 (3.39 eV) compared to the bulk material reported in the literature (3.2 eV). HRTEM micrograph showed the presence of grain boundary with d spacings of 0.352, 0.245, and 0.190, which correspond to the lattice planes of (101), (004), and (200), respectively. From the EDX analysis, the weight percents of titanium and oxygen were found to be 54.33 and 45.67%, respectively. The photoinduced degradation of methylene blue (MB) dye was investigated in the presence of biosynthesized IL-TiO2 NPs photocatalyst. The effect of parameters like catalyst dosage (30 mg/L), initial concentration of MB (15 ppm), pH (10.5), and contact time (100 min) on the removal efficiency was optimized. The maximum photodegradation efficiency under the optimized conditions was found to be 98%.

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High-performance photocatalytic WO3 nanoparticles for treatment of acidic wastewater

Cited by 18 publications

References 29 publications

Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination

Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination

High specific surface area γ-Al2O3 nanoparticles synthesized by facile and low-cost co-precipitation method

Green Synthesis of TiO₂ Using Impatiens rothii Hook.f. Leaf Extract for Efficient Removal of Methylene Blue Dye

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High-performance photocatalytic WO3 nanoparticles for treatment of acidic wastewater

Cited by 18 publications

References 29 publications

Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination

Regulating NIR reflecting property of hydrothermally synthesized tungsten oxide nanostructures via calcination

High specific surface area γ-Al2O3 nanoparticles synthesized by facile and low-cost co-precipitation method

Green Synthesis of TiO2 Using Impatiens rothii Hook.f. Leaf Extract for Efficient Removal of Methylene Blue Dye

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Green Synthesis of TiO₂ Using Impatiens rothii Hook.f. Leaf Extract for Efficient Removal of Methylene Blue Dye