scholarly journals Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 117
Author(s):  
Zahir Muhammad ◽  
Farman Ali ◽  
Muhammad Sajjad ◽  
Nisar Ali ◽  
Muhammad Bilal ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Solid State ◽  
Room Temperature ◽  
Organic Dyes ◽  
Uv Light ◽  
Heterogeneous Photocatalysis ◽  
Ft Ir ◽  
Complete Mineralization

Degradation of organic dyes and their byproducts by heterogeneous photocatalysts is an essential process, as these dyes can be potentially discharged in wastewater and threaten aquatic and xerophyte life. Therefore, their complete mineralization into nontoxic components (water and salt) is necessary through the process of heterogeneous photocatalysis. In this study, Zr/CrO2 (Zirconium-doped chromium IV oxide) nanocomposite-based photocatalysts with different compositions (1, 3, 5, 7 & 9 wt.%) were prepared by an environmentally friendly, solid-state reaction at room temperature. The as-prepared samples were calcined under air at 450 °C in a furnace for a specific period of time. The synthesis of Zr/CrO2 photocatalysts was confirmed by various techniques, including XRD, SEM, EDX, FT-IR, UV-Vis, and BET. The photocatalytic properties of all samples were tested towards the degradation of methylene blue and methyl orange organic dyes under UV light. The results revealed a concentration-dependent photocatalytic activity of photocatalysts, which increased the amount of dopant (up to 5 wt.%). However, the degradation efficiency of the catalysts decreased upon further increasing the amount of dopant due to the recombination of holes and photoexcited electrons.

scholarly journals Study of photocatalytic activity of TiO2 fluorinated by thermal shock method for the degradation of different dyes

2015 ◽  
Vol 18 (2) ◽  
pp. 121-131
Author(s):  
Khoa Tien Le ◽  
Ngoc Chau Hoang ◽  
Tien Thuy Thai ◽  
Anh Trung Le ◽  
Thinh Nguyen Huu Pham ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Thermal Shock ◽  
Photocatalytic Oxidation ◽  
Organic Dyes ◽  
Cationic Dye ◽  
Solution Ph ◽  
Ph Values ◽  
Methylene Blue Cationic Dye

TiO2 P25 was fluorinated by thermal shock method in order to study the influence of thermal shock fluorination on the surface properties and the photocatalytic activity for the degradation of cationic and anionic organic dyes at different pH values. The surface charge of catalysts was characterized by the pHPZC measurement. The photocatalytic activity of catalysts was evaluated via the degradation of methylene blue (cationic dye) and methyl orange (anionic dye). The results showed that the thermal shock fluorination and the rise of solution pH can increase the surface negative charge of TiO2, which enhanced the adsorption of methylene blue and then improved the photocatalytic degradation of this cationic dye under UV and visible light. On the other hand, after the fluorination, the adsorption of methyl orange on TiO2 was strongly reduced, which limited the photocatalytic oxidation of this anion dye.

scholarly journals Facile Hydrothermal Synthesis of SnO2 Nanospheres as Photocatalysts

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Wenquan Hu ◽  
Xiaoguang Yuan
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Organic Dyes ◽  
Uv Light ◽  
Average Diameter ◽  
Potential Candidate ◽  
Wastewater Purification ◽  
Uv Light Irradiation ◽  
Degradation Rates ◽  
Photocatalytic Activities

Large amounts of SnO2 nanospheres are successfully synthesized through a simple and effective hydrothermal method. The as-synthesized products consist of numerous small SnO2 nanocrystals with an average diameter of 40 nm. The as-prepared SnO2 nanospheres are further used as the photocatalysts for photodegrading several organic dyes (methylene blue, methyl orange, Congo red, and rhodamine B) under UV light irradiation. The photocatalytic results show that the as-synthesized SnO2 nanospheres possess high photocatalytic activities. Compared with the degradation rates of other dyes, that of methylene blue reaches 98.5% by 30 min irradiation. It reveals that the as-prepared product might be potential candidate in wastewater purification.

Study on Photocatalytic Properties of Anatase Phase TiO2 Synthesized by Ultrasonic-Assisted Hydrolysis

2012 ◽  
Vol 573-574 ◽  
pp. 110-114 ◽  
Author(s):  
Jin Xia ◽  
Ri Ya Jin ◽  
Kai Xuan Guo ◽  
Si Jing Yang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Anatase Phase ◽  
Ultrasonic Method ◽  
X Ray Diffraction ◽  
Hydrolysis Method ◽  
Titanium Tetra Isopropoxide ◽  
Ultrasonic Assisted ◽  
Ft Ir

Titanium dioxide powders were synthesized by ultrasonic-assisted hydrolysis reaction of titanium tetra-isopropoxide at the low-temperature. The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD). The photocatalytic activity of samples were investigated by the degradation of methyl orange under UV light radiation (6W, λ= 352nm) at room temperature. The results indicated that the products were mainly composed of high homogeneity anatase phases, and the methyl orange degradation rate can reach more than 90% under ultraviolet irradiation 180min. The photocatalytic activity of the samples prepared by ultrasonic method is higher than that of the samples prepared by conventional hydrolysis method.

Preparation and Characterization of Nanocrystalline La2Ti2O7 by Microwave Assisted Process

2016 ◽  
Vol 852 ◽  
pp. 525-529 ◽  
Author(s):  
Ying Zhou ◽  
Zhi Yong Mei ◽  
Hai Shao Ye ◽  
Wen Wen Su ◽  
Xi Zhao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Raw Materials ◽  
Spherical Shape ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Ft Ir

Using La (NO3)3·6H2O, TiCl4 , and citric acid as the main raw materials, nanocrystalline La2Ti2O7 samples were prepared by microwave assisted method. The structure and morphology of samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier Transform Infrared (FT-IR) spectroscopy. The photocatalytic activity of La2Ti2O7 was studied for methyl orange (MO) used as simulated sewage. It was found that the single phase La2Ti2O7 could be obtained through the calcination of microwave processed La2Ti2O7 precursors at 600 °C. The resulted product had an approximate spherical shape and average grain size of 50 nm in diameter. Under UV light, the photocatalytic experiment indicated that the prepared La2Ti2O7 nanocrystalline had high photocatalytic activity for degradation of methyl orange.

Photocatalytic Degradation of Methylene Blue and Methyl Orange with Fe-Doped ZnO Nanoparticles Modified with Natural Zeolite and Montmorillonite: Comparative Study

2015 ◽  
Vol 1123 ◽  
pp. 295-302 ◽  
Author(s):  
Nur Afifah ◽  
Siti Adriani ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Natural Zeolite ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
Resonance Spectroscopy ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation

The present study compares the photocatalytic decolorization ability of Fe-doped ZnO modified both natural zeolite and montmorillonite towards aqueous solution of organic dyes such as methylene blue and methyl orange under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray, Fourier-transform infrared absorption, and electron spin resonance spectroscopy. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to natural zeolite.

Highly efficient photocatalytic degradation of organic dyes by Cu doped ZnO nanostructures

2015 ◽  
Vol 17 (38) ◽  
pp. 25172-25181 ◽  
Author(s):  
Sini Kuriakose ◽  
Biswarup Satpati ◽  
Satyabrata Mohapatra
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Organic Dyes ◽  
Zno Nanostructures ◽  
Highly Efficient ◽  
Doped Zno

Cu doped ZnO nanostructures exhibit highly efficient sunlight driven photocatalytic activity for degradation of methylene blue and methyl orange dyes.

scholarly journals Photocatalytic Degradation of the Light Sensitive Organic Dyes: Methylene Blue and Rose Bengal by Using Urea Derived g-C3N4/ZnO Nanocomposites

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1457
Author(s):  
Fahad A. Alharthi ◽  
Abdulaziz Ali Alghamdi ◽  
Hamdah S. Alanazi ◽  
Amjad Abdullah Alsyahi ◽  
Naushad Ahmad
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Rose Bengal ◽  
Organic Dyes ◽  
Uv Light ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Practical Applications ◽  
Transmission Electron ◽  
Ft Ir

In this study, we report the fabrication of graphitic carbon nitride doped zinc oxide nanocomposites, g-C3N4/ZnO, (Zn-Us) by using different amount of urea. They were further characterized by X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Raman, UV-vis, Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM) techniques. The prepared nanocomposites were used as photocatalysts for the mineralization of the light sensitive dyes Methylene Blue (MB) and Rose Bengal (RB) under UV light irradiation, and corresponding photo-mechanism was proposed. Benefiting from these photocatalytic characteristics, urea derived g-C3N4/ZnO photocatalysts have been found to have excellent photodegradation activity against the MB and RB for 6 h and 4 h, respectively. Under the given experimental conditions, the degradation percentage of fabricated Zn-Us were shown ~90% for both model dyes. Compared to cationic MB dye, anionic RB dye is more actively degraded on the surface of prepared photocatalysts. The results obtained can be effectively used for future practical applications in wastewater treatment

Synthesis of TbMnO3 by Microwave Assisted Method and its Photocatalytic Activity

2017 ◽  
Vol 748 ◽  
pp. 408-412 ◽  
Author(s):  
Min Min Jin ◽  
Chun Yu Long ◽  
Fang Fang Peng ◽  
Pei Song Tang ◽  
Hai Feng Chen
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Manganese Acetate ◽  
X Ray Diffraction ◽  
Terbium Oxide ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Using terbium oxide (Tb4O7), manganese acetate (MnC4H6O4·4H2O), citric acid (C6H8O7) and urea (CO(NH2)2) as the main materials, the TbMnO3 was prepared by a facile microwave assisted process. The TbMnO3 samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform Infrared (FT-IR) spectroscopy. XRD and SEM demonstrated the successful synthesis of single phase TbMnO3 and an average grain size of 100 nm in diameter. Under UV-light, the photocatalytic activity of TbMnO3 calcination at 800 °C was investigated by decomposition simulation wastewater containing 20 mg/L methyl orange (MO). The degradation rate of methyl orange can arrive to 95% when light irradiation was 180 min in presence of TbMnO3. The results show that TbMnO3 has highly photocatalytic activity for the degradation of methyl orange.

scholarly journals Preparation of TiO2-Fullerene Composites and Their Photocatalytic Activity under Visible Light

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Ken-ichi Katsumata ◽  
Nobuhiro Matsushita ◽  
Kiyoshi Okada
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Solution Process ◽  
The Other ◽  
Photogenerated Electrons ◽  
Ft Ir

The development of visible light-sensitive photocatalytic materials is being investigated. In this study, the anatase and rutile-C60composites were prepared by solution process. The characterization of the samples was conducted by using XRD, UV-vis, FT-IR, Raman, and TEM. The photocatalytic activity of the samples was evaluated by the decolorization of the methylene blue. From the results of the Raman, FT-IR, and XRD, the existence of the C60was confirmed in the samples. The C60was modified on the anatase or rutile particle as a cluster. The C60didn't have the photocatalytic activity under UV and visible light. The anatase and rutile-C60composites exhibited lower photocatalytic activity than the anatase and rutile under UV light. The anatase-C60exhibited also lower activity than the anatase under visible light. On the other hand, the rutile-C60exhibited higher activity than the rutile under visible light. It is considered that the photogenerated electrons can transfer from the C60to the rutile under visible light irradiation.

scholarly journals TiO2-rGO Composite for Photocatalytic Decolorization of Methylene Blue Under the Visible Light Illumination

2021 ◽  
Vol 9 (4) ◽  
pp. 167
Author(s):  
Ulfa Farizka Hidayati ◽  
Anthoni B. Aritonang ◽  
Lia Destiarti
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Uv Light ◽  
Bandgap Energy ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
Visible Light Illumination ◽  
Blue Solution ◽  
Ft Ir

Titanium dioxide-reduced graphene oxide (TiO2-rGO) was synthesized by hydrothermal method using TiO2 powder and rGO precursor from graphite rod by modified Marcano Method. The obtained TiO2-rGO photocatalyst was characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), and Diffuse reflectance UV (DRUV). Based on XRD diffractogram, it is known that TiO2 has an anatase crystal phase. In the FTIR spectrum, it was observed that there was an absorption peak at the wavenumber of 1630 cm-1 from the vibration (C=C) as an indication that the C atom was incorporated into the TiO2 structure. The incorporation of C atoms into the TiO2 structure to form TiO2-rGO causes the bandgap energy to decrease from 3.29 eV to 3.20 eV. The photocatalytic activity was tested against decolorization of methylene blue solution for 180 minutes under visible light illumination from a 50 watt LED lamp. Every 10 minutes, absorbance was measured using a UV-Vis spectrophotometer at a wavelength of 664 nm. TiO2-rGO photocatalyst has better photocatalytic activity with %D of 96.39% under UV light and 84.32% under visible light illumination, while TiO2 is only able to degrade 93.87% and 36.55%, respectively.

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