scholarly journals Tribocatalytic degradation of dyes by tungsten bronze ferroelectric Ba2.5Sr2.5Nb8Ta2O30 submicron particles

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13386-13395
Author(s):  
Chaozhong Sun ◽  
Xiaoying Guo ◽  
Changzheng Hu ◽  
Laijun Liu ◽  
Liang Fang ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Dye Degradation ◽  
Tungsten Bronze ◽  
Submicron Particles ◽  
New Approach ◽  
Degradation Of Dyes

Searching for a new approach in environmental remediation in terms of dye degradation is important in industrialized society.

scholarly journals An overview to photo-catalytic degradation of dyes in waste water

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Mohd Hanief Najar ◽  
Ishtiyaq Ahmed Najar
Keyword(s):  
Waste Water ◽  
Environmental Remediation ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Environmentally Benign ◽  
Nano Composites ◽  
High Toxicity ◽  
Food Industries ◽  
Degradation Of Dyes ◽  
Carcinogenic Effects

Organic dyes used in textile and food industries are the important sources of environmental contaminations due to their non-bio degradability and high toxicity to aquatic creatures and carcinogenic effects on humans. This demands environmental remediation by the use of techniques which are environmentally benign. For this purpose, a general overview of dye degradation by light in the presence of materials as photo-catalysts has been given. The mechanism of action has also been described. Importantly, the materials involved in dye degradation usually involve nano-composites of either conducting polymers or metal-oxidesor graphene based systems which are insoluble in aqueous solutions, hence will be environmentally benign and can therefore be recovered after use.

scholarly journals Co3O4/TiO2 hetero-structure for methyl orange dye degradation

2018 ◽  
Vol 79 (5) ◽  
pp. 947-957 ◽  
Author(s):  
Mahabubur Chowdhury ◽  
Sarah Kapinga ◽  
Franscious Cummings ◽  
Veruscha Fester
Keyword(s):  
Catalytic Activity ◽  
Methyl Orange ◽  
Environmental Remediation ◽  
Metal Ion ◽  
Dye Degradation ◽  
Lattice Structure ◽  
Host Lattice ◽  
Commercial Application ◽  
Potential Candidate ◽  
Methyl Orange Degradation

Abstract Advanced oxidation processes based on sulphate radical generated by peroxymonosulphate (PMS) activation is a promising area for environmental remediation. One of the biggest drawbacks of heterogeneous PMS activation is catalyst instability and metal ion leaching. In this study, a simple organic binder mediated route was explored to substitute Ti4+ ions into the Co3O4 host lattice structure to create a Co-O-Ti bond to minimise cobalt leaching during methyl orange degradation. The catalyst was characterised by X-ray diffraction, and scanning and transmission electron microscopy. The as-prepared catalysts with Co3O4:TiO2 ratio of 70:30 exhibited minimal leaching (0.9 mg/L) compared to other ratios studied. However, the pristine Co3O4 exhibited highest catalytic activity (rate constant = 0.41 min−1) and leaching (26.7 mg/L) compared to composite material (70:30 Co3O4:TiO2). Interestingly, the morphology of the composite and leaching of Co2+ ions were found to be temperature dependent, as an optimum temperature ensured strong Co-O-Ti bond for prevention of Co2+ leaching. The classical quenching test was utilised to determine the presence and role of radical species on methyl orange degradation. The fabricated catalyst also exhibited good catalytic activity in degrading mixed dyes and good recyclability, making it a potential candidate for commercial application.

Facile Synthesis of Unique Bismuth Vanadate Nano-Knitted Hollow Cage and its Application in Environmental Remediation

2019 ◽  
Vol 74 (3) ◽  
pp. 259-263 ◽  
Author(s):  
M. Shamshi Hassan
Keyword(s):  
Environmental Remediation ◽  
Dye Degradation ◽  
High Surface ◽  
High Surface Area ◽  
Bismuth Vanadate ◽  
Bandgap Energy ◽  
Blue Dye ◽  
X Ray ◽  
Photodegradation Efficiency ◽  
Hollow Nanostructure

AbstractHierarchical bismuth vanadate (BiVO4) nano-knitted hollow cages have been synthesized by simple hydrothermal method and characterized by scanning electron microscopy, x-ray diffraction, energy-dispersive x-ray spectrometer, Fourier transform infrared, UV-Vis, and Raman. The photodegradation efficiency of BiVO4 nanocage for universally used methylene blue dye. The BiVO4 hollow nanostructure demonstrated better photocatalytic competence in dye degradation as compared to the commercial TiO2 powders (P25). The excellent dye degradation can be certified to the high crystallisation of monoclinic BiVO4 and hollow nanostructure, which leads to high surface area and small bandgap energy of 2.44 eV.

scholarly journals Green synthesis of the innovative super paramagnetic nanoparticles from the leaves extract of Fraxinus chinensis Roxb and their application for the decolourisation of toxic dyes

2019 ◽  
Vol 8 (1) ◽  
pp. 256-271 ◽  
Author(s):  
Imran Ali ◽  
Changsheng Peng ◽  
Dichu Lin ◽  
Iffat Naz
Keyword(s):  
Environmental Remediation ◽  
Degradation Mechanism ◽  
Pseudo First Order Reaction ◽  
Solution Ph ◽  
Factors Affecting ◽  
Toxic Dyes ◽  
Degradation Of Dyes ◽  
Stability Structure ◽  
Ft Ir ◽  
Fraxinus Chinensis

Abstract The leaves extract of Fraxinus chinensis Roxb was used for the synthesis of the innovative phytogenic magnetic nanoparticles (PMNPs) without adding toxic surfactants. The formation, morphology, elemental composition, size, thermal stability, structure and magnetic properties of these PMNPs were examined by UV-visible spectrophotometry, FT-IR, XRD, SEM, EDX, TEM, VSM, XPS, BET and TGA. The reactivity of the obtained PMNPs against decolourising toxic dyes, namely, malachite green (MG), crystal violet (CV) and methylene blue (MB), were investigated by UV-vis spectrophotometry. Further, the factors affecting the removal of dyes, including solution pH, adsorbent dosages, initial concentration of dyes, reaction temperature and contact time, were also investigated. The results revealed the decolourisation of 99.12% of MG and 98.23% of CV within 60 min, and 97.52% of MB within 200 min by the PMNPs using dyes concentration of 25 mg/l at pH 6.5 and 298.15 K. The kinetics outcome indicated that the degradation of dyes matched well to the pseudo first-order reaction kinetics model. Furthermore, the probable degradation mechanism of dyes by the PMNPs, including the adsorption of cationic dye molecules onto the negatively charged surface of adsorbent and the oxidation of the Fe° in the solution, were discussed. Thus, the PMNPs can be produced by the bulk and have great potential to be employed for biomedical/environmental remediation.

scholarly journals Photocatalytic and Biological Activity of ZnO Nanoparticles Using Honey

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1046
Author(s):  
M. Sharmila ◽  
R. Jothi Mani ◽  
Abdul Kader ◽  
Awais Ahmad ◽  
Gaber E. Eldesoky ◽  
...  
Keyword(s):  
Biological Activity ◽  
Zno Nanoparticles ◽  
Environmental Remediation ◽  
Dye Degradation ◽  
Xrd Analysis ◽  
Fungal Species ◽  
Size Estimation ◽  
Bonding Structure ◽  
Antibacterial And Antifungal Activities ◽  
Vis Spectroscopy

The innovation and development of water purification methods have been at the center of extensive research for several decades. Many nanoparticles are frequently seen in industrial waste water. In this research, zinc oxide nanoparticles (ZnO) were synthesized following an autocombustion method with and without honey capping. Structural crystallinity and bonding structure were examined via X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) spectroscopy. Optical behavior was analyzed using ultraviolet–visible (UV–Vis) spectroscopy and photoluminescence (PL). Size estimation and surface morphology were studied using scanning electron microscopy (SEM), while energy-dispersive spectroscopy (EDS) was performed to analyze the sample purity and elemental composition. The photocatalytic degradation of methylene blue (MB) by ZnO was assessed as it is an efficient water treatment process with high potential. The biological activity of ZnO nanoparticles was also investigated in terms of antibacterial and antifungal activities against different bacterial and fungal species. Surprisingly, the as-synthesized ZnO nanoparticles were found to be substantially bioactive compared to conventional drugs. Honey-mediated nanoparticles displayed 86% dye degradation efficiency, and that of bare ZnO was 60%. Therefore, the involvement of honey in the synthesis of ZnO nanoparticles has great potential due to its dual applicability in both biological and environmental remediation processes.

scholarly journals A C-Doped TiO2/Fe3O4 Nanocomposite for Photocatalytic Dye Degradation under Natural Sunlight Irradiation

2019 ◽  
Vol 3 (3) ◽  
pp. 75 ◽  
Author(s):  
Mamo Gebrezgiabher ◽  
Gebrehiwot Gebreslassie ◽  
Tesfay Gebretsadik ◽  
Gebretinsae Yeabyo ◽  
Fikre Elemo ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Diffuse Reflectance Spectroscopy ◽  
Dye Degradation ◽  
Sol Gel ◽  
Catalyst Loading ◽  
Simple Method ◽  
Doped Tio2 ◽  
Natural Sunlight ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Reactions

Magnetically recyclable C-doped TiO2/Fe3O4 (C-TiO2/Fe3O4) nanocomposite was successfully synthesized via a sol–gel method. The synthesized samples were characterized using SEM, energy-dispersive X-ray spectroscopy (EDS), FTIR, and UV-VIS diffuse reflectance spectroscopy (DRS) techniques. The results clearly showed that a C-TiO2/Fe3O4 nanocomposite was produced. The photocatalytic activities of the prepared pristine (TiO2), C-doped TiO2 (C-TiO2) and C-TiO2/Fe3O4 were evaluated by the photodegradation of methyl orange (MO) under natural sunlight. The effect of catalyst loading and MO concentration were studied and optimized. The C-TiO2/Fe3O4 nanocomposite exhibited an excellent photocatalytic activity (99.68%) that was higher than the TiO2 (55.41%) and C-TiO2 (70%) photocatalysts within 150 min. The magnetic nanocomposite could be easily recovered from the treated solution by applying external magnetic field. The C-TiO2/Fe3O4 composite showed excellent photocatalytic performance for four consecutive photocatalytic reactions. Thus, this work could provide a simple method for the mass production of highly photoactive and stable C-TiO2/Fe3O4 photocatalyst for environmental remediation.

scholarly journals Kinetic and ecotoxicological evaluation of the direct orange 26 dye degradation by Fenton and solar photo-Fenton processes

2018 ◽  
Vol 22 ◽  
pp. 5 ◽  
Author(s):  
Rayany Magali da Rocha Santana ◽  
Graziele Elisandra do Nascimento ◽  
Polyana Karynne de Aguiar Silva ◽  
Alex Leandro Andrade de Lucena ◽  
Thamara Figueiredo Procópio ◽  
...  
Keyword(s):  
Working Conditions ◽  
Dye Degradation ◽  
Oxygen Demand ◽  
Kinetic Studies ◽  
Textile Dye ◽  
Degradation Of Dyes ◽  
Ecotoxicological Evaluation ◽  
Portulaca Grandiflora ◽  
Oxidative Processes ◽  
Nonlinear Kinetic

The presence of color in textile effluents has been studied because of the need for more effective treatments. Therefore, advanced oxidative processes (AOP) have been used in the degradation of dyes, as well as in the conversion of organic matter. This study evaluated the degradation of the direct orange 26 textile dye by Fenton and photo-Fenton processes (with natural solar radiation). A statistical analysis, based on factorial 23 indicated the best working conditions, being: [H2O2] = 100 mg·L-1 and pH 3-4, for both AOP in that the [Fe] =  1 e 5 mg·L-1, for photo-Fenton and Fenton, respectively. The results of the kinetic studies demonstrated a good fit to the nonlinear kinetic model proposed by Chan and Chu, with values of R2 > 0,996 (photo-fenton) and R2 > 0,939 (Fenton). The tests performed to evaluate the chemical oxygen demand indicated conversions of 62.05% (Fenton) and 66.41% (photo-Fenton). Finally, the ecotoxicity study indicated that the post-treatment samples were non-toxic to the bacteria Escherichia coli and Proteus mirabilis but showed growth inhibition for Lactuca sativa (Fenton and photo-Fenton) seeds and for Brassica juncea and Portulaca grandiflora (Fenton).

Importance and Analytical Perspective of Green Synthetic Strategies of Copper, Zinc, and Titanium Oxide nanoparticles and their applications in Pathogens and Environmental Remediation

2020 ◽  
Vol 17 ◽  
Author(s):  
Sagar Panhwar ◽  
Jamil A. Buledi ◽  
Dadu Mal ◽  
Amber R. Solangi ◽  
Aamna Balouch ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Green Synthesis ◽  
Environmental Remediation ◽  
Pathogenic Bacteria ◽  
Dye Degradation ◽  
Synthetic Methods ◽  
Present Review ◽  
Modern World ◽  
Vast Number ◽  
Electrochemical Applications

Background: Nanotechnology is the promising field of science which deals with the production and utilization of material under nanoscale dimensions. The nanoscale regime provides exceptional applications in various fields of science due to their large surface to volume ratio and many valuable properties. Hence, the production and use of nanomaterials are the prominent areas of modern research. Amongst the nanomaterials, metal oxide NPs have gained much attention due to their vast number of applications in different areas including electrochemical applications, dye degradation, catalysis and are known to be the exceptional entities in the battle against different pathogens. The metal oxides are viably synthesized through chemical methods that requires the use of many noxious chemicals. Henceforth, it is the demand of the modern world to carry out research on the synthesis of metal oxide nanomaterials through eco-friendly, greener and non-toxic routes. Thus, various green methods are employed to engineer the metals oxide NPs by using different greener, cheaper and eco-friendly sources, employing the use of plant extracts, bacteria, fungi and other biological bodies. The present review covered the green synthesis of CuO, ZnO, TiO2 NPs and their applicability towards different pathogens and environmental remediation reported from 2015 to till date. Objective: The exceptional catalytic properties, environmental and antimicrobial applications of metal oxide especially CuO, ZnO, TiO2, are the main prominence of this review articles. The most cost-effective and greener routes for synthesis of CuO, ZnO, TiO2, are discussed in the present review. Till date various green synthetic methods for preparation of mentioned nanoparticles and their applicability towards different pathogens and degradation of different hazardous dye with some electrochemical applications has been thoroughly covered in this review. Conclusion: The biosynthesis of metal oxide NPs using greener and eco-friendly approaches have been the attentive area in the last decade. Green synthesis requires the chemical-free active component from biological sources which act as both the reducing and stabilizing agent for the size and shape-controlled production of NPs. The future vision of bacterial, fungal and plant-mediated production of NPs includes the postponement of laboratory-based work to large industrial scale, exposition of different phytochemicals involved in the biosynthesis of NPs using bioinformatics techniques and stemming the real mechanism involved in preventing the growth of pathogenic bacteria, fungi, and algae. The plant-mediated NPs can have diverse applications in the arena of pharmaceutical, food and cosmetic industries and thus became a vital area of modern research.

Trifunctional metal–organic platform for environmental remediation: structural features with peripheral hydroxyl groups facilitate adsorption, degradation and reduction processes

2019 ◽  
Vol 48 (3) ◽  
pp. 915-927 ◽  
Author(s):  
Harpreet Kaur ◽  
Rakesh Kumar ◽  
Ajay Kumar ◽  
Venkata Krishnan ◽  
Rik Rani Koner
Keyword(s):  
Visible Light ◽  
Environmental Remediation ◽  
Metal Organic Framework ◽  
Structural Features ◽  
Hydroxyl Groups ◽  
Reduction Processes ◽  
Degradation Of Dyes ◽  
Visible Light Active ◽  
Metal Organic ◽  
Selective Adsorbent

A Cd(ii)-based metal–organic framework (MOF) has been demonstrated to have trifunctional properties, namely as an efficient and selective adsorbent for dyes, a visible-light-active photocatalyst for the degradation of dyes and a photocatalyst for Cr(vi) reduction.

Strong tribocatalytic dye degradation by tungsten bronze Ba4Nd2Fe2Nb8O30

2020 ◽  
Author(s):  
Chaozhong Sun ◽  
Xiaoying Guo ◽  
Rui Ji ◽  
Changzheng Hu ◽  
Laijun Liu ◽  
...  
Keyword(s):  
Dye Degradation ◽  
Tungsten Bronze
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