Recyclable Natural Magnetite Nanoparticles for Effective Degradation of Methylene Blue in Water under UV Light Irradiation

2020 ◽  
Vol 855 ◽  
pp. 315-321
Author(s):  
Nandang Mufti ◽  
Siti Maryam ◽  
Henry Setiyanto ◽  
Ahmad Taufiq ◽  
Sunaryono
Keyword(s):  
Methylene Blue ◽  
Magnetite Nanoparticles ◽  
Uv Light ◽  
Light Irradiation ◽  
Additional Advantage ◽  
Uv Light Irradiation ◽  
Fenton Catalyst ◽  
Ability To Act ◽  
Materials Used ◽  
Co Precipitation

Among the numerous materials used for dye removal, magnetite is particularly interesting due to its ability to act as an adsorbent and a Fenton catalyst, being easily separable by application of a magnetic field and reusable. Herein, we describe a co-precipitation–based synthesis of magnetite nanoparticles (particle size = 11 nm, surface area = 147.12 m2 g–1) from iron sand and investigate their effectiveness for methylene blue (MB) degradation. The above nanoparticles could promote the decomposition of MB both in the dark (via adsorption) and under UV light irradiation (via Fenton-type degradation), exhibiting the additional advantage of recyclability. Thus, MB degradation efficiencies are 76.32, 76.08, and 68.52% for first, second, and third cycles, respectively, indicating that the prepared magnetic material is a promising recyclable catalyst for the decontamination of dye-containing wastewater. The photo Fenton reactions take to account for reproducibility of MB degradation.

scholarly journals Photocatalytic Degradation of Methylene Blue under UV Light Irradiation on Prepared CarbonaceousTiO2

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Zatil Amali Che Ramli ◽  
Nilofar Asim ◽  
Wan N. R. W. Isahak ◽  
Zeynab Emdadi ◽  
Norasikin Ahmad-Ludin ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
In Situ Polymerization ◽  
Uv Light ◽  
Carbon Composite ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Transmission Electron ◽  
Vis Spectroscopy

This study involves the investigation of altering the photocatalytic activity of TiO2using composite materials. Three different forms of modified TiO2, namely, TiO2/activated carbon (AC), TiO2/carbon (C), and TiO2/PANi, were compared. The TiO2/carbon composite was obtained by pyrolysis of TiO2/PANi prepared by in situ polymerization method, while the TiO2/activated carbon (TiO2/AC) was obtained after treating TiO2/carbon with 1.0 M KOH solution, followed by calcination at a temperature of 450°C. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), thermogravimetric analysis (TG-DTA), Brunauer-Emmet-Teller (BET), and UV-Vis spectroscopy were used to characterize and evaluate the prepared samples. The specific surface area was determined to be in the following order: TiO2/AC > TiO2/C > TiO2/PANi > TiO2(179 > 134 > 54 > 9 m2 g−1). The evaluation of photocatalytic performance for the degradation of methylene blue under UV light irradiation was also of the same order, with 98 > 84.7 > 69% conversion rate, which is likely to be attributed to the porosity and synergistic effect in the prepared samples.

scholarly journals Fabrication and Characterization of Cobalt-Pigmented Anodized Zinc for Photocatalytic Application

2021 ◽  
Author(s):  
Judith Chebwogen ◽  
Christopher Mkirema Maghanga
Keyword(s):  
Methylene Blue ◽  
Water Treatment ◽  
Uv Light ◽  
Health Hazard ◽  
Solar Spectrum ◽  
Light Irradiation ◽  
Small Scale ◽  
Uv Light Irradiation ◽  
Photocatalytic Application ◽  
Blue Solution

Population growth and urbanization have led to water scarcity and pollution, which is a health hazard not only to humans but also to the ecosystem in general. This has necessitated coming up with ways of treating water before consumption. Photocatalysis has proved to be one of the most promising cheap techniques that involve chemical utilization of solar energy. TiO2 widely used in photocatalysis absorbs a narrow range of the solar spectrum compared to ZnO. In this regard, this study aimed at preparing and optimizing cobalt-pigmented ZnO, which is applicable in photocatalytic water treatment. The objectives in this study were to fabricate zinc oxide (ZnO) thin films by anodization, pigment the fabricated films with varying cobalt concentrations, characterize the fabricated films optically, and investigate the cobalt-pigmented ZnO’s performance in the methylene blue degradation under UV light irradiation. Mirror-polished zinc plates were sonicated in ethanol and rinsed. Anodization was done at room temperature in 0.5 M oxalic acid at a constant voltage of 10 V for 60 min, and cobalt electrodeposited in the films. Post-deposition treatment was done at 250°C. Optical properties of the films were studied using a UV-VIS- NIR spectrophotometer in the solar range of 300–2500 nm. The photocatalytic activity of the fabricated films was studied in methylene blue solution degradation in the presence of UV light irradiation for 5 h. Cobalt pigmenting was observed to reduce reflectance and optical band gap from 3.34 to 3.10 eV indicating good photocatalytic properties. In this study, ZnO film pigmented with cobalt for 20 s was found to be the most photocatalytic with a rate constant of 0.0317 h−1 and hence had the optimum cobalt concentration for photocatalytic water treatment. This can be applied in small-scale water purification.

Photocatalytic Enhancement in Methylene Blue Degradation of TiO2 Photocatalysts via Graphene Hybridization

2012 ◽  
Vol 512-515 ◽  
pp. 1677-1681
Author(s):  
Feng Zhou ◽  
Ying Qing Fu ◽  
Xin Wan
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Light Irradiation ◽  
Tio2 Photocatalyst ◽  
Electron Hole ◽  
Methylene Blue Degradation ◽  
Uv Light Irradiation ◽  
High Migration ◽  
Facile Route

A facile route was demonstrated to obtain an efficient graphene-hybridized TiO2 photocatalyst. The photodegradation results of Methylene Blue over graphene hybridized with TiO2 showed that the photocatalytic activity could be significantly enhanced under UV light irradiation. The structure between TiO2 and graphene as well as its effect on the photocatalytic activity were systematically investigated. The mechanism of the enhanced photocatalytic activity is based to the high migration efficiency and the inhibition of recombination of photoinduced electron-hole pairs. The graphene hydridization is proven to be a promising approach to develop highly efficient and stable photocatalysts under UV light irradiation.

Decomposition of Organic Dye in Water through a Heterogeneous Fenton Process Catalyzed by Fe (III)-Grafted PTFE Fiber Complex

2012 ◽  
Vol 602-604 ◽  
pp. 913-916
Author(s):  
Zhi Zhong Ding ◽  
Yong Chun Dong
Keyword(s):  
Dye Degradation ◽  
Uv Light ◽  
Light Irradiation ◽  
Fenton Process ◽  
Heterogeneous Fenton ◽  
Irradiation Intensity ◽  
Uv Light Irradiation ◽  
Fenton Catalyst ◽  
Fe Content ◽  
Visible Irradiation

Fe (III)-modified polytetrafluoroethylene (PTFE) fiber complex was prepared with poly acrylic acid grafted PTFE fiber and FeCl3 aqueous solution and used a novel heterogeneous Fenton catalyst for the photo-assisted degradation of Rhodamine B in water. The results indicated that Fe (III)-grafted PTFE) fiber complex can significantly enhance the dye degradation at a wide pH media under light irradiation. Increasing Fe content of the catalyst, H2O2 concentration and visible irradiation intensity leads to a fast degradation. Moreover, UV light irradiation is much more effective than visible light irradiation for promoting dye degradation.

Montmorillonite Incorporated in Cr Doped ZnO Nanoparticles for Degradation of Organic Dyes in Water under UV Light Irradiation

2015 ◽  
Vol 1123 ◽  
pp. 316-321 ◽  
Author(s):  
Vici Tritella Carmida ◽  
Mia Putri Rahmawati ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Methylene Blue ◽  
Zno Nanoparticles ◽  
Congo Red ◽  
Organic Dyes ◽  
Uv Light ◽  
Organic Pollutant ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Uv Light Irradiation ◽  
Doped Zno

In this study, the photocatalytic degradation of methylene blue and congo red has been investigated using montmorillonite modified Cr-doped ZnO nanoparticles. Chromium doped zinc oxide nanoparticles were synthesized by co-precipitation method and were characterized using X-ray diffraction, Fourier-transform infrared absorption and UV-visible spectrophotometer. Furthermore these nanoparticles were explored to degradation of methylene blue and congo red in aqueous solution as model of organic pollutant under UV light irradiation. Comparison of degradation efficiency demonstrated that Cr-doped ZnO nanoparticles modified montmorillonite exhibited higher activity than pure Cr-doped ZnO.

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