scholarly journals MIL-101(Cr)–cobalt ferrite magnetic nanocomposite: synthesis, characterization and applications for the sonocatalytic degradation of organic dye pollutants

RSC Advances ◽  
2020 ◽  
Vol 10 (54) ◽  
pp. 32845-32855 ◽  
Author(s):  
Abbasali Mokhtari Andani ◽  
Tayebeh Tabatabaie ◽  
Saeed Farhadi ◽  
Bahman Ramavandi
Keyword(s):  
Cobalt Ferrite ◽  
Organic Dyes ◽  
Organic Dye ◽  
Magnetic Nanocomposite ◽  
Hydrothermal Route ◽  
Dye Pollutants ◽  
Magnetically Separable

A magnetically separable MIL-101(Cr)/CoFe2O4 binary nanocomposite was prepared via a hydrothermal route and applied as a sonocatalyst for the efficient degradation of organic dyes.

scholarly journals Ag3PO4/CoFe2O4 magnetic nanocomposite: synthesis, characterization and applications in catalytic reduction of nitrophenols and sunlight-assisted photocatalytic degradation of organic dye pollutants

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18293-18304 ◽  
Author(s):  
Eslam Abroushan ◽  
Saeed Farhadi ◽  
Abedien Zabardasti
Keyword(s):  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Catalytic Reduction ◽  
Organic Dyes ◽  
Catalytic Performance ◽  
Nitro Compounds ◽  
Organic Dye ◽  
Magnetic Nanocomposite ◽  
Facile Hydrothermal Method ◽  
Dye Pollutants

A novel magnetically recyclable Ag3PO4/CoFe2O4 nanocomposite was synthesized by a facile hydrothermal method and its photocatalytic/catalytic performance for the degradation of organic dyes or reduction of nitro compounds was investigated.

scholarly journals Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 104 ◽  
Author(s):  
Surabhi Kamal ◽  
Guan-Ting Pan ◽  
Siewhui Chong ◽  
Thomas Chung-Kuang Yang
Keyword(s):  
Methylene Blue ◽  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Congo Red ◽  
Carbon Nitride ◽  
Cobalt Ferrite ◽  
Organic Dyes ◽  
Bandgap Energy ◽  
X Ray ◽  
Dye Pollutants

The sulfur-doped carbon nitride/cobalt ferrite nanocomposite (SCN/CoFe2O4) was prepared via ultrasonication and studied for the sonocatalytic degradation of wastewater organic dye pollutants including methylene blue, rhodamine B, and Congo red. The X-ray photoelectron spectroscopy confirmed the presence and atomic ratios of S, C, N, Co, Fe, and O elements and their corresponding bonds with Co2+ and Fe3+ cations. The nanocomposite was found to have aggregated nanoparticles on a sheet-like structure. The bandgap energy was estimated to be 1.85 eV. For the sonocatalytic degradation of 25-ppm methylene blue at 20 kHz, 1 W and 50% amplitude, the best operating condition was determined to be 1 g/L of catalyst dosage and 4 vol % of hydrogen peroxide loading. Under this condition, the sonocatalytic removal efficiency was the highest at 96% within a reaction period of 20 min. SCN/CoFe2O4 outperformed SCN and CoFe2O4 by 2.2 and 6.8 times, respectively. The SCN/CoFe2O4 nanocomposite was also found to have good reusability with a drop of only 7% after the fifth cycle. However, the degradation efficiencies were low when tested with rhodamine B and Congo red due to difference in dye sizes, structural compositions, and electric charges.

scholarly journals PREPARATION OF COMPOSITE MATERIALS BASED ON COBALT (II) FERRITE FOR PURIFICATION OF AQUEOUS SOLUTIONS

2021 ◽  
Vol 64 (2) ◽  
pp. 95-102
Author(s):  
Nina P. Shabelskaya ◽  
Marina A. Egorova ◽  
Anna V. Arzumanova ◽  
Elena A. Yakovenko ◽  
Vladimir M. Zababurin ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Composite Materials ◽  
Water Treatment ◽  
Cobalt Ferrite ◽  
Organic Dyes ◽  
Foam Glass ◽  
Thermal Power ◽  
Organic Dye ◽  
Simple Method ◽  
Industrial Enterprises

In this paper, composite materials based on cobalt (II) ferrite, which is a promising object of research as a magnetic material, are obtained. Thus, it is known to be used for producing organo / inorganic and non-organo/inorganic compositions. The introduction of cobalt ferrite makes it possible to give new properties to carrier materials. As a carrier, waste from the production of phosphoric acid – phosphogypsum, ash – and – slag waste from thermal power stations and cullet-foam glass, and activated carbon were used. Finding a way to process waste to produce new composite materials is an urgent task of chemical technology. The obtained samples were studied using X-ray phase analysis and electron microscopy. In the course of the conducted research, the principal possibility of using the specified number of production wastes for the synthesis of catalytically active materials is shown. Photocatalytic reactions are widely used in water treatment processes for wastewater treatment from organic pollutants. A simple method for obtaining composite materials of the composition of foam glass/ cobalt ferrite (II), phosphogypsum/ cobalt ferrite (II), activated carbon/ cobalt ferrite (II) is proposed. The catalytic properties of synthesized materials in the process of oxidative destruction of an organic dye in the presence of hydrogen peroxide are studied. It was found that the highest activity under the specified conditions is observed for the activated carbon/ cobalt (II) ferrite composite: complete removal of the organic dye from the aqueous solution is achieved after 90 min from the beginning of the reaction. The phosphogypsum-based composite shows the least pronounced activity. The results obtained can serve as a guide for choosing a method for producing non-toxic materials that are promising for use in water treatment systems and ensuring environmental safety of industrial enterprises that use organic dyes in the production process.

Template-free synthesis of Fe3O4 nanorod bundles and their highly efficient peroxidase mimetic activity for the degradation of organic dye pollutants with H2O2

2015 ◽  
Vol 39 (10) ◽  
pp. 7759-7762 ◽  
Author(s):  
Diganta Bhuyan ◽  
Sudhir S. Arbuj ◽  
Lakshi Saikia
Keyword(s):  
Crystal Violet ◽  
High Surface ◽  
Volume Ratio ◽  
Organic Dye ◽  
Solar Light ◽  
Highly Efficient ◽  
Dye Pollutants ◽  
Peroxidase Mimetic ◽  
Crystal Violet Dye ◽  
Template Free

The high surface to volume ratio of Fe3O4 nanorods facilitates the excellent activation of H2O2 for the photo-Fenton-like degradation of crystal violet dye under solar light.

scholarly journals Studies on Synthesis and Characterization of Fe3O4@SiO2@Ru Hybrid Magnetic Composites for Reusable Photocatalytic Application

2022 ◽  
Vol 2022 ◽  
pp. 1-18
Author(s):  
Avvaru Praveen Kumar ◽  
Dinesh Bilehal ◽  
Tegene Desalegn ◽  
Shalendra Kumar ◽  
Faheem Ahmed ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Organic Dyes ◽  
Research Work ◽  
Magnetic Microspheres ◽  
Visible Radiation ◽  
Magnetic Composites ◽  
Acid Media ◽  
Dye Pollutants ◽  
Bet Analysis

Degradation of dye pollutants by the photocatalytic process has been regarded as the most efficient green method for removal organic dyes from contaminated water. The current research work describes the synthesis of Fe3O4@SiO2@Ru hybrid magnetic composites (HMCs) and their photocatalytic degradation of two azo dye pollutants, methyl orange (MO) and methyl red (MR), under irradiation of visible light. The synthesis of Fe3O4@SiO2@Ru HMCs involves three stages, including synthesis of Fe3O4 magnetic microspheres (MMSs), followed by silica (SiO2) coating to get Fe3O4@SiO2 MMSs, and then incorporation of presynthesized Ru nanoparticles (~3 nm) onto the surface of Fe3O4@SiO2 HMCs. The synthesized HMCs were characterized by XRD, FTIR, TEM, EDS, XPS, BET analysis, UV-DRS, PL spectroscopy, and VSM to study the physical and chemical properties. Furthermore, the narrow band gap energy of the HMC photocatalyst is a significant parameter that provides high photocatalytic properties due to the high light adsorption. The photocatalytic activity of synthesized Fe3O4@SiO2@Ru HMCs was assessed by researching their ability to degrade the aqueous solution of MO and MR dyes under visible radiation, and the influence of various functional parameters on photocatalytic degradation has also been studied. The results indicate that the photocatalytic degradation of MO and MR dyes is more than 90%, and acid media favors better degradation. The probable mechanism of photodegradation of azo dyes by Fe3O4@SiO2@Ru HMC catalysts has been proposed. Furthermore, due to the strong ferromagnetic Fe3O4 core, HMCs were easily separated from the solution after the photocatalytic degradation process for reuse. Also, the photocatalytic activity after six cycles of use is greater than 90%, suggesting the stability of the synthesized Fe3O4@SiO2@Ru HMCs.

Anomalous but massive removal of two organic dye pollutants simultaneously

2016 ◽  
Vol 318 ◽  
pp. 54-60 ◽  
Author(s):  
Zilin Meng ◽  
Yihe Zhang ◽  
Zhilei Zhang ◽  
Qian Zhang ◽  
Paul K. Chu ◽  
...  
Keyword(s):  
Organic Dye ◽  
Dye Pollutants

Morphological effect of ZnO nanoparticles for photocatalytic degradation of azo dyes in water

2021 ◽  
Author(s):  
Sayed Amininejad ◽  
Thomas Baumann ◽  
Nasrin Talebian ◽  
Seyedeh Matin Amininezhad
Keyword(s):  
Zno Nanoparticles ◽  
Organic Dyes ◽  
Uv Light ◽  
Particle Morphology ◽  
Oxide Semiconductors ◽  
Morphological Effect ◽  
Dye Pollutants ◽  
Natural Streams ◽  
Zno Particles ◽  
Close Relationship

<p>Discharge of organic dyes from different industries into receiving rivers and natural streams poses serious problems for the environment because of their toxicity. These dyes are not readily biodegradable and therefore, their removal from effluents is urgent. Various methods used for removal of dyes from wastewater, such as coagulation, flocculation, filtration or reverse osmosis are quite expensive and have a low removal efficiency. On the contrary, Advanced oxidation processes (AOPs) using metal oxide semiconductors like ZnO, are capable to operate effectively and efficiently to degrade many dye pollutants.</p><p>In this work, ZnO nanoparticles were successfully synthesized via a simple solvothermal method with different solvents. Scanning electron microscopy (SEM) imaging showed that nanoflower, nanorod, and nanosphere ZnO particles were produced when water, 1-hexanol, and ethylene glycol were used as the solvent, respectively. Nanoflower ZnO particles exhibited higher photocatalytic reduction efficiencies under UV light irradiation than nanosphere and nanorod particles. Results suggested a close relationship between the photocatalytic activity and the particle morphology and size which was due to using different solvents in preparation processes. Also, the recovery of ZnO nanoparticles was investigated and samples showed stable photodegradation efficiencies after being reused for three times.</p>

Sign in / Sign up

Export Citation Format

Share Document