scholarly journals Heterogeneous UV/Fenton-Like Degradation of Methyl Orange Using Iron Terephthalate MIL-53 Catalyst

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Pham Dinh Du ◽  
Huynh Thanh Danh ◽  
Pham Ngoc Hoai ◽  
Nguyen Mau Thanh ◽  
Vo Thang Nguyen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Photoelectron Spectroscopy ◽  
Nitrogen Adsorption ◽  
High Catalytic Activity ◽  
Potential Candidate ◽  
Factors Affecting ◽  
X Ray ◽  
Activity Loss ◽  
Degradation Of Methyl Orange

The synthesis and degradation of methyl orange (MO) in an ultraviolet-assisted heterogeneous Fenton-like process via the iron terephthalate (MIL-53) catalyst are demonstrated. MIL-53 material was characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectra (DR-UV-Vis), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms. It was found that the obtained material shares an identical pattern of the MIL-53 structure with high crystallinity and also demonstrates the mesoporous phase with a pore diameter of around 4.2 nm and specific surface area, SBET, of 88.2 m2·g−1. MIL-53 with UV irradiation exhibits high catalytic activity for MO degradation by hydrogen peroxide. The factors affecting the efficiency of MO decomposition including pH of the solution, H2O2 concentration, catalyst dosage, initial MO concentration, and reaction temperature were addressed. The present catalyst is stable after four recycles with slight catalytic activity loss which makes it a potential candidate for environmental restoration.

scholarly journals Synthesis and Characterization of Sr-Doped ZnSe Nanoparticles for Catalytic and Biological Activities

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2189
Author(s):  
V. Beena ◽  
S. L. Rayar ◽  
S. Ajitha ◽  
Awais Ahmad ◽  
Munirah D. Albaqami ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Antibacterial Activity ◽  
Methyl Orange ◽  
Photoelectron Spectroscopy ◽  
Biological Activities ◽  
Water Remediation ◽  
Precipitation Method ◽  
Znse Nanoparticles ◽  
X Ray ◽  
Degradation Of Methyl Orange

The development of cost-effective and ecofriendly approaches toward water purification and antibacterial activity is a hot research topic in this era. Purposely, strontium-doped zinc selenide (Sr-doped ZnSe) nanoparticles, with different molar ratios of Sr2+ cations (0.01, 0.05, and 0.1), were prepared via the co-precipitation method, in which sodium borohydride (NaBH4) and 2-mercaptoethanol were employed as reducing and stabilizing agents, respectively. The ZnSe cubic structure expanded by Sr2+ cations was indicated by X-ray diffraction (XRD) analysis. The absorption of the chemical compounds on the surface was observed via Fourier transform infrared (FT-IR) spectroscopy. The optical orientation was measured by ultraviolet–visible diffused reflectance spectroscopy (UV-DRS) analysis. The surface area, morphology, and elemental purity were analyzed using field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and energy-dispersive spectroscopy (EDS) analyses. The oxidation state and valency of the synthesized nanoparticles were analyzed using X-ray photoelectron spectroscopy (XPS). Sr-doped ZnSe nanoparticles were investigated for photocatalytic degradation of methyl orange (MO), and their antibacterial potential was investigated against different bacterial strains. The antibacterial activity examined against Staphylococcus aureus and Escherichia coli implied the excellent biological activity of the nanoparticles. Moreover, the Sr-doped ZnSe nanoparticles were evaluated by the successful degradation of methyl orange under visible light irradiation. Therefore, Sr-doped ZnSe nanoparticles have tremendous potential in biological and water remediation fields.

Electrochemical Degradation of Methyl Orange by Samarium and Antimony Codoped SnO2 Electrodes

2014 ◽  
Vol 1004-1005 ◽  
pp. 962-966
Author(s):  
Lu Sheng Chen ◽  
Huan Shuang Zhang ◽  
Shu Lian Liu ◽  
Wen Hua Song ◽  
Chao Liu ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Calcination Temperature ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electro Catalytic Activity ◽  
Orange Solution ◽  
Degradation Of Methyl Orange

In this work, samarium and antimony (Sm–Sb) codoped tin oxide (SnO2) films have been successfully prepared on titanium (Ti) substrate by a facile sol gel method. The samples were characterized by X–ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The composite film materials were used as anode for the electro-degradation of methyl orange solution. Two effective factors of electro–catalytic properties namely, the content of Sm in the SnO2 samples and the calcination temperature, have been optimized based on the electro-degradation experiments. A moderately calcination temperature of 873 K and 1.0% Sm doping owned the best performance. The smaller grain sizes and optical band gap of the SnO2 by introduction of the Sm improved electro-catalytic activity.

Preparation and Properties of Eu3+-Doped TiO2 Nanowires

2012 ◽  
Vol 624 ◽  
pp. 67-71
Author(s):  
Si Qin Zhao ◽  
Hong Liang Wan ◽  
S. Asuha
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Sodium Titanate ◽  
X Ray ◽  
Valence States ◽  
Photocatalytic Activities ◽  
Crystallite Sizes ◽  
Degradation Of Methyl Orange

Nanowires of sodium titanate, TiO2 and Eu3+/TiO2 were synthesized by hydrothermal method, and their microstructure, optical properties and valence states of exterior elements were characterized by X-ray powder diffraction (XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy techniques. At the same time, the photocatalytic activities of the materials for degradation of methyl orange under visible-light irradiation were also investigated. The results showed the formation of nanowires of sodium titanate with average crystallite sizes of 50-200 nm and in lengths from several microns to several dozens microns, and its chemical formula was determined to be Na2Ti3O7. TiO2 and Eu3+ /TiO2nanowires were prepared from the Na2Ti3O7 nanowires via ion exchange (i.e., with H+ and Eu3+ ions) and high temperature sintering processes. These three kinds of nanowires showed different photocatalytic activities for degradation of methyl orange. Na2Ti3O7 nanowire did not show any photocatalytic activity for methyl orange degradation, while TiO2 nanowire was superior to Na2Ti3O7 nanowire; and, Eu3+/ TiO2 nanowire possessed the highest photocatalytic activity.

scholarly journals Synthesis of Iron Doped Zeolite Imidazolate Framework-8 and Its Remazol Deep Black RGB Dye Adsorption Ability

2017 ◽  
Vol 2017 ◽  
pp. 1-18 ◽  
Author(s):  
Mai Thi Thanh ◽  
Tran Vinh Thien ◽  
Vo Thi Thanh Chau ◽  
Pham Dinh Du ◽  
Nguyen Phi Hung ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Hydrothermal Process ◽  
Dye Adsorption ◽  
Specific Area ◽  
Nitrogen Adsorption ◽  
Vital Role ◽  
Factors Affecting ◽  
X Ray ◽  
Effective Removal ◽  
Iron Doped

Zeolite imidazole framework-8 (ZIF-8) and the iron doped ZIF-8 (Fe-ZIF-8) were synthesized by the hydrothermal process. The obtained materials were characteristic of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), nitrogen adsorption/desorption isotherms, and atomic absorption spectroscopy (AAS). The results showed that the obtained Fe-ZIF-8 possessed the ZIF-8 structure with a large specific area. ZIF-8 and Fe-ZIF-8 were used for the removal of Remazol Deep Black (RDB) RGB dye from aqueous solutions. The various factors affecting adsorption such as pH, initial concentration, contact time, and temperature were investigated. The results showed that the introduction of iron into ZIF-8 provided a much larger adsorption capacity and faster adsorption kinetics than ZIF-8 without iron. The electrostatic interaction and π-π interaction between the aromatic rings of the RDB dye and the aromatic imidazolate rings of the adsorbent were responsible for the RDB adsorption. Moreover, the coordination of the nitrogen atoms and oxygen in carboxyl group in RDB molecules with the Fe2+ ions in the ZIF-8 framework played a vital role for the effective removal of RDB from aqueous solution.

scholarly journals Degradation of Methyl Orange by Photoassisted Fenton Reaction Using Indonesian Bauxite as Catalyst

2019 ◽  
Author(s):  
Nur Tsalits Fahman Mughni
Keyword(s):  
Methyl Orange ◽  
Fenton Reaction ◽  
Methyl Orange Solution ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Novel Catalyst ◽  
Uvc Radiation ◽  
Orange Solution ◽  
Degradation Of Methyl Orange

A Novel catalyst prepared from Indonesia bauxite was used as a catalyst for photo fenton degradation of methyl orange solution. This catalyst is more cheaper than Nafion-based catalyst and more greener than other synthesized catalysts. It is easily prepared from Indonesian natural resources. X-ray diffraction measurements provide structure and mineral compostion of bauxite, while XRF provides information on the composition of Fe by 18% by weight of bauxite mass. The presence of large amounts of Fe in bauxite acts as a catalyst in the decomposition of metyl orange. Testing of photo fenton activity to decompose metyl orange showed that indonesian bauxite had high catalytic activity, was able to decompose 99.4% metyl orange within 40 minutes on irradiation using an 8Watt UVC radiation source

scholarly journals One-Step Cohydrothermal Synthesis of Nitrogen-Doped Titanium Oxide Nanotubes with Enhanced Visible Light Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Cheng-Ching Hu ◽  
Tzu-Chien Hsu ◽  
Li-Heng Kao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Nitrogen Adsorption ◽  
Raw Material ◽  
Factors Affecting ◽  
X Ray ◽  
Nitrogen Doped ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Nitrogen-doped TiO2nanotubes with enhanced visible light photocatalytic activity have been synthesized using commercial titania P25 as raw material by a facile P25/urea cohydrothermal method. Morphological and microstructural characteristics were conducted by transmission electron microscopy, powder X-ray diffraction, and nitrogen adsorption/desorption isotherms; chemical identifications were performed using X-ray photoelectron spectroscopy, and the interstitial nitrogen linkage to the TiO2nanotubes is identified. The photocatalytic activity of nitrogen-doped TiO2nanotubes, evaluated by the decomposition of rhodamine B dye solution under visible light using UV-vis absorption spectroscopy, is found to exhibit ~ four times higher than that of P25 and undoped titanate nanotubes. Factors affecting the photocatalytic activity are analyzed; it is found that the nitrogen content and surface area, rather than the crystallinity, are more crucial in affecting the photocatalytic efficiency of the nitrogen-doped TiO2nanotubes.

scholarly journals Sol-Gel Synthesized MagneticMnFe2O4Spinel Ferrite Nanoparticles as Novel Catalyst for Oxidative Degradation of Methyl Orange

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Linfeng Zhang ◽  
Yuanxin Wu
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Surface Area ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Oxidative Degradation ◽  
Ferrite Nanoparticles ◽  
Magnetic Response ◽  
X Ray ◽  
Degradation Of Methyl Orange

The MnFe2O4spinel ferrite nanoparticles with sensitive magnetic response properties and high specific surface area were prepared from metal nitrates by the sol-gel process as catalysts for oxidative degradation of methyl orange (MO). The nanoparticles were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), BET surface area analysis, H2-Temperature programmed reduction (H2-TPR), X-ray photoelectron spectra (XPS), and vibration sample magnetometer (VSM). The catalytic activity experimental results showed that the MnFe2O4spinel ferrite nanoparticles possess very high MO degradation activity. It is expected that this kind of MnFe2O4spinel ferrite nanoparticles has a potential application in water treatment fields due to its sensitive magnetic response properties and high catalytic activity.

scholarly journals Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and p-Nitrophenol

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3224
Author(s):  
Ying Wang ◽  
Chuanxi Yang ◽  
Yonglin Liu ◽  
Yuqi Fan ◽  
Feng Dang ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Zno Nps ◽  
Uniform Size ◽  
X Ray ◽  
Degradation Rates ◽  
Degradation Of Methyl Orange

The photocatalytic degradation of organic pollutants is an effective method of controlling environmental pollution. ZnO nanoparticles (ZnO NPs) were prepared by the solvothermal method and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectroscopy (UV–Vis DRS). The results showed that the ZnO NPs had a uniform size of 25–40 nm, hexagonal wurtzite structure, and a band gap of 2.99 eV. The photocatalytic degradation of methyl orange (MO) and p-nitrophenol (PNP) was used as a model reaction to evaluate the photocatalytic activity of ZnO NPs. The photocatalytic degradation rates (pseudo-first-order kinetics) of MO and PNP were 92% (0.0128 min−1) and 56.2% (0.0042 min−1), respectively, with a 25 W ultraviolet lamp, MO/PNP concentration = 20 mg/L, ZnO NPs dose = 1.5 g/L, and time = 180 min. The photocatalytic mechanism of ZnO NPs and degradation pathways of MO and PNP were also proposed. The results provide valuable information and guidance for the treatment of wastewater via photocatalytic methods.

Preparation and Photo-catalytic Activity of Cu-Supported Nano-TiO2

2020 ◽  
Vol 1 (1) ◽  
pp. 38-42
Author(s):  
Jun Yan
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Nano Tio2 ◽  
Hydrolysis Method ◽  
Response Range ◽  
Photo Response ◽  
Forced Hydrolysis ◽  
Visible Photocatalytic Activity

Cu-supported nano-TiO2 catalyst was prepared by forced hydrolysis method under mild condition. The morphology, composition and optical absorption properties of the samples were characterized by means of scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy (UV-VIS DRS). Visible photocatalytic activity of the samples was investigated by photocatalytic degradation experiment on methyl orange. The results indicated that nano-TiO2 was about 20nm in size with the main form of anatase, and photo response range was significantly broadened after it was loaded on the surface of Cu. The sample possessed high visible light catalytic activity, with the degradation rate of methyl orange reaching 94% under simulated natural light.

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