A new visible driven nanocomposite including Ti-substituted polyoxometalate/TiO2: synthesis, characterization, photodegradation of azo dye process optimization by RSM and specific removal rate calculations

Rafiee, Ezzat; Noori, Elham; Zinatizadeh, Ali Akbar; Zanganeh, Hadis

doi:10.1007/s10854-018-0205-8

Cited by 23 publications

(5 citation statements)

References 39 publications

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“…In Figure 4b, the absorption peaks at wavenumbers of 600 to 1000 cm −1 was related to Ti-O-Ti bands (40,44). Also, a peak appeared at wavenumbers of 1600 and 3500 cm −1 was related to the OH stretching of water (H 2 O) or hydroxyl groups on the surface of TiO 2 , which has a very important role in the photocatalytic reaction (32,45,46). In Figure 4c, the FTIR spectra of T/N-Z nanocomposite indicated that the absorption vibration peaks at wavenumbers of 438 and 1038 cm −1 was related to the Si-O group.…”

Section: Ft-ir Analysismentioning

confidence: 96%

The performance of TiO₂ /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

Ebrahimi

Jafari

Ebrahimpour

et al. 2020

Environ Health Eng Manag

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Background: Microcystin (MC) is a hepatotoxic and carcinogenic toxin that is generated by cyanotoxins which can have adverse effects on the human health. Therefore, it is very important to remove it from the environment. This study was performed to investigate the efficiency of titanium dioxide (TiO 2)/ NaY-zeolite (T/N-Z) nanocomposite for removal of MC-LR under ultraviolet light. Methods: In the present study, T/N-Z nanocomposite was synthesized using the hydrothermal method. Specification of the photocatalysts was determined by the field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) spectra. The response surface methodology (RSM) was used to survey the effects of operating variables such as pH, contact time, and catalyst dose on the removal of MC-LR. The MC-LR concentration was measured by high-performance liquid chromatography (HPLC). Results: It was revealed that the increase of contact time and catalyst dose had a positive effect on enhancing the removal efficiency of MC-LR, but pH had a negative effect. Finally, the maximum MC-LR removal efficiency was 97.63%, which occurred at pH = 5, contact time = 120 min, and catalyst dose = 1.2 g/L. Conclusion: In general, T/N-Z composite in aqueous solutions under the UV light can easily decompose MC-LR and it can also be proposed as an efficient composite for removal of MC-LR from contaminated water.

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Section: Ft-ir Analysismentioning

confidence: 96%

The performance of TiO₂ /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

Ebrahimi

Jafari

Ebrahimpour

et al. 2020

Environ Health Eng Manag

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“…First, when the catalyst was illuminated, electrons and holes were generated [ 51 ]. The holes oxidized the water molecules on the surface of the catalyst, forming ·OH, while the electrons and dissolved oxygen underwent a series of reactions to form ·O 2 − , following Equations (4)–(6) [ 52 ]. ·OH and·O 2 − were the main active components in the photocatalytic reaction process, and they could rapidly oxidize the NH 4 + /NH 3 /NH 3 ·H 2 O adsorbed on the surface of the catalyst [ 53 ].…”

Section: Discussionmentioning

confidence: 99%

Preparation of a Z-Type g-C3N4/(A-R)TiO2 Composite Catalyst and Its Mechanism for Degradation of Gaseous and Liquid Ammonia

Zhu

Liu

Wang

et al. 2022

IJMS

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In this study, an (A-R)TiO2 catalyst (ART) was prepared via the sol–gel method, and g-C3N4 (CN) was used as an amendment to prepare the g-C3N4/(A-R)TiO2 composite catalyst (ARTCN). X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, N2 adsorption–desorption curves (BET), UV–vis diffuse absorption spectroscopy (UV–vis DRS), and fluorescence spectroscopy (PL) were used to evaluate the structure, morphology, specific surface area, optical properties, and photocarrier separation ability of the catalysts. The results showed that when the modifier CN content was 0.5 g, the dispersion of the ARTCN composite catalyst was better, with stronger light absorption performance, and the forbidden band width was smaller. Moreover, the photogenerated electrons in the conduction band of ART transferred to the valence band of CN and combined with the holes in the valence band of CN, forming Z-type heterostructures that significantly improved the efficiency of the photogenerated electron-hole migration and separation, thus increasing the reaction rate. Gaseous and liquid ammonia were used as the target pollutants to investigate the activity of the prepared catalysts, and the results showed that the air wetness and initial concentration of ammonia had a great influence on the degradation of gaseous ammonia. When the initial concentration of ammonia was 50 mg/m3 and the flow rate of the moist air was 0.9 mL/min, the degradation rate of gaseous ammonia by ARTCN-0.5 reached 88.86%, and it had good repeatability. When the catalytic dose was 50 mg and the initial concentration of NH4+ was 100 mg/L, the degradation rate of liquid ammonia by ARTCN-0.5 was 71.60% after 3 h of reaction, and small amounts of NO3− and NO2− were generated. The superoxide anion radical (·O2−) and hydroxyl radical (·OH) were the main active components in the photocatalytic reaction process.

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“…Berbeda halnya dengan material Cu(II)-TiO2/Bi2O3 yang menunjukkan % degradasi tertinggi sebesar 85,85%. Hal ini karena material Cu(II)-TiO2/Bi2O3 memiliki band gap yang kecil sebesar 2,18 eV yang dapat merespon atau menyerap sinar tampak (visible) serta dapat meningkatkan luas permukaan TiO2 sebagai fotokatalis sehingga semakin banyak polutan organik yang terdegradasi oleh fotokatalis [31], [32].…”

Section: Gambar 5 Aktivitas Degradasi Fotokatalis Cu(ii)-tio2unclassified

Synthesis of The Cu(II)-doped TiO2/Bi2O3 as a Photocatalyst for Rhodamin B Degradation Under Visible Light Ilumination

Aritonang,

Asma,

Sapar

2023

B. SAINSTEK

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The Cu(II)-doped TiO2 and Cu(II)-doped TiO2 /Bi2O3 compound have been synthesized using the sol gel method with titanium tetraisopropoxide (TTIP) as the TiO2 precursor and Cu(NO3)2.3H2O as the Cu(II) dopant was carried out at various concentration of 0.075%; 0.250% and 1.000%, as well as Bi(NO3)3.5H2O as a Bi2O3 precursor. Based on characterization using the DRSUV-Vis spectrophotometric method with data analysis using a tauch plot, it is known that the band gap energy of Cu(II)-doped TiO2 is 2.89 eV; 2.72 eV; 2.54 eV. The addition of Bi2O3 to Cu(II)-doped TiO2 (1%) causes a decrease in the band gap from 2.54 to 2.18 eV which is equivalent to a wavelength of 567 nm. IR spectrophotometry spectra analysis shows a shift in Ti-O absorption towards smaller wave numbers. Characterization by the XRD method shows that 1% Cu(II)-doped TiO2 /Bi2O3 has an anatase phase with a crystallite size of 24 nm. Photocatalysis activity test on the degradation of rhodamine B solution at a concentration of 10 ppm, under visible light illumination for 180 minutes was able to degrade up to 85.85%.

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A new visible driven nanocomposite including Ti-substituted polyoxometalate/TiO2: synthesis, characterization, photodegradation of azo dye process optimization by RSM and specific removal rate calculations

Cited by 23 publications

References 39 publications

The performance of TiO₂ /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

The performance of TiO₂ /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

Preparation of a Z-Type g-C3N4/(A-R)TiO2 Composite Catalyst and Its Mechanism for Degradation of Gaseous and Liquid Ammonia

Synthesis of The Cu(II)-doped TiO2/Bi2O3 as a Photocatalyst for Rhodamin B Degradation Under Visible Light Ilumination

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A new visible driven nanocomposite including Ti-substituted polyoxometalate/TiO2: synthesis, characterization, photodegradation of azo dye process optimization by RSM and specific removal rate calculations

Cited by 23 publications

References 39 publications

The performance of TiO2 /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

The performance of TiO2 /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

Preparation of a Z-Type g-C3N4/(A-R)TiO2 Composite Catalyst and Its Mechanism for Degradation of Gaseous and Liquid Ammonia

Synthesis of The Cu(II)-doped TiO2/Bi2O3 as a Photocatalyst for Rhodamin B Degradation Under Visible Light Ilumination

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The performance of TiO₂ /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)

The performance of TiO₂ /NaY-zeolite nanocomposite in photocatalytic degradation of Microcystin-LR from aqueous solutions: Optimization by response surface methodology (RSM)