Photocatalytic degradation of methyl orange using ZnO nanopowders synthesized via thermal decomposition of oxalate precursor method

Kaur, Japinder; Bansal, Sandeep; Singhal, Sonal

doi:10.1016/j.physb.2013.02.005

Cited by 154 publications

(77 citation statements)

References 34 publications

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“…Therefore, in typical photocatalytic decomposition experiments, MO is chosen as a model industrial organic pollutant to evaluate photocatalytic degradation. 6 Photocatalytic activity of undoped and N-doped TiO 2 photocatalysts in an aqueous solution of MO at neutral pH under natural solar light was carried out, since it is very stable dye. The degradation mechanism is illustrated in detail.…”

Section: F1 Photocatalytic Degradation Of Methyl Orangementioning

confidence: 99%

Green sol–gel route for selective growth of 1D rutile N–TiO₂: a highly active photocatalyst for H₂ generation and environmental remediation under natural sunlight

et al. 2017

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We report selective growth of N-TiO 2 1D nanorods using a green aqueous sol-gel method followed by hydrothermal treatment. Titanium tetraisopropoxide, diethanolamine, and H 2 O 2 were used as precursors for preparing an aqueous gel. Trifluoroacetic acid (TFA) was used as a growth regulator for selective growth of desired structure and morphology. Effects of TFA on the structure and morphology of N-TiO 2 were studied by varying concentration of TFA between 1-10% by volume. Structural characterization using XRD confirmed formation of a specific rutile phase with slight crystal disorder with N-doped TiO 2 samples. FESEM and HRTEM analysis showed formation of 1D rice grain shaped N-TiO 2 in the presence of 1% TFA solution. One directional growth along the (211) A. IntroductionAmong transition metal oxide photocatalysts, titania (TiO 2 ) has been an intensively investigated candidate within the ambit of various potential applications such as photocatalytic water splitting, 1-3 organic pollutant degradation, 4-7 supercapacitors, 8 dye sensitized solar cells (DSSC), 9-12 Li-ion battery photo anodes, 13,14gas-sensors, 15,16 and super-hydrophilicity. 17 This can be ascribed to its fascinating electronic and optical properties, namely, favourable electronic band structure, non-toxicity, biocompatibility, long term chemical stability towards photo-corrosion, and, importantly, commercial cost-effectiveness.18,19 However, photocatalytic quantum efficiency of TiO 2 in solar applications is still limited due to its broad bandgap (3.0 and 3.2 eV for rutile and anatase phases, respectively) responding to UV radiation only (l < 387 nm).20 But, UV radiation accounts for merely 5% of solar photons. Subsequently, another important drawback with TiO 2 is a high recombination rate of photogenerated electron-hole pairs. To compensate for the above challenges, many attempts have been made to decrease the threshold energy of TiO 2 or photo-excitation by red-shiing its photo-response to visible light having a wavelength (l) range between 400-800 nm.

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Section: F1 Photocatalytic Degradation Of Methyl Orangementioning

confidence: 99%

Green sol–gel route for selective growth of 1D rutile N–TiO₂: a highly active photocatalyst for H₂ generation and environmental remediation under natural sunlight

et al. 2017

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“…It is, however, difficult to compare the presented data directly, since among the reaction conditions there are at least three variables that affect the rate of the decomposition: the amount (0.17-1.00 mg · cm -3 ) or area (0.16-4.00 cm 2 ) of the catalyst, the concentration of MO (5-50 mg · dm -3 ), and the power of the light source (11-500 W). Additionally, increasing the amount or area of photocatalyst [31] and the power of light used for illumination [32], and decreasing the concentration of the dye [13,31] all lead to higher rate of decomposition.…”

Section: Resultsmentioning

confidence: 99%

Photosensitization of TiO2 P25 with CdS Nanoparticles for Photocatalytic Applications

Trenczek-Zając¹,

Banaś²,

Świerczek³

et al. 2017

Archives of Metallurgy and Materials

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A TiO 2 /CdS coupled system was prepared by mixing the TiO 2 P25 with CdS synthesized by means of the precipitation method. It was found that the specific surface area (SSA) of both components is extremely different and equals 49.5 for TiO 2 and 145.4 m 2 ·g -1 for CdS. The comparison of particle size distribution and images obtained by means of transmission electron microscopy (TEM) showed agglomeration of nanocomposites. X-ray diffraction (XRD) patterns suggest that CdS crystallizes in a mixture of cubic and hexagonal phases. Optical reflectance spectra revealed a gradual shift of the fundamental absorption edge towards longer wavelengths with increasing CdS molar fraction, which indicates an extension of the absorption spectrum of TiO 2 . The photocatalytic activity in UV and UV-vis was tested with the use of methyl orange (MO). The Langmuir-Hinshelwood model described well the photodegradation process of MO. The results showed that the photocatalytic behaviour of the TiO 2 /CdS mixture is significantly better than that of pure nanopowders.

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“…For MO, degradation efficiency was increased from pH 1 to 3 and then decreased from pH 3 to 9. Photocatalytic activity should be increased with the increase in pH as at higher pH values because more OH ions are available, which increases the formation of OH radicals [25]. But in this case, different behavior was observed because at lower pH values the formation of HO 2 radicals takes place, which compensates for the deficiency of hydroxyl ions [26].…”

Section: Effect Of Phmentioning

confidence: 99%

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

Ullah¹,

Ali²,

Hanif³

et al. 2017

Pol. J. Environ. Stud.

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Photocatalytic degradation of methyl orange using ZnO nanopowders synthesized via thermal decomposition of oxalate precursor method

Cited by 154 publications

References 34 publications

Green sol–gel route for selective growth of 1D rutile N–TiO₂: a highly active photocatalyst for H₂ generation and environmental remediation under natural sunlight

Green sol–gel route for selective growth of 1D rutile N–TiO₂: a highly active photocatalyst for H₂ generation and environmental remediation under natural sunlight

Photosensitization of TiO2 P25 with CdS Nanoparticles for Photocatalytic Applications

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

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Photocatalytic degradation of methyl orange using ZnO nanopowders synthesized via thermal decomposition of oxalate precursor method

Cited by 154 publications

References 34 publications

Green sol–gel route for selective growth of 1D rutile N–TiO2: a highly active photocatalyst for H2 generation and environmental remediation under natural sunlight

Green sol–gel route for selective growth of 1D rutile N–TiO2: a highly active photocatalyst for H2 generation and environmental remediation under natural sunlight

Photosensitization of TiO2 P25 with CdS Nanoparticles for Photocatalytic Applications

Photocatalytic Activity of Al2O3.Fe2O3 Synthesized by Ultrasonic-Assisted Mechanical Stirring

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Green sol–gel route for selective growth of 1D rutile N–TiO₂: a highly active photocatalyst for H₂ generation and environmental remediation under natural sunlight

Green sol–gel route for selective growth of 1D rutile N–TiO₂: a highly active photocatalyst for H₂ generation and environmental remediation under natural sunlight