FTIR study of methylene blue plasma degradation products through plasma treatment on water

Abstract Detection of residual organic and inorganic species in water bodies including drinking water has led to developing strategies for their removal. Here we report a very efficient method of photoreduction of Cr (VI) and photodegradation of methylene blue dye in aqueous medium using Z-scheme heterojunction based Sn3O4/SnS2 solar photocatalyst. The photocatalyst is synthesized by hydrothermal route and it is thoroughly characterized in terms of its structural, compositional, morphological and optical properties. About 100 % of Cr (VI) reduction in 60 min and 99.6 % of methylene blue degradation in 90 min is achieve under sunlight exposure at a photocatalytic rate of 0.066 min-1 and 0.043 min-1, respectively. The total organic carbon estimation of the post-degradation reaction medium corresponded to 85.1 % (MB) mineralization. The photocatalytic degradation is attributed to in-situ generation of reactive oxygen species (ROS) e.g., superoxide radicals, hydroxide radicals, and the role of ROS towards reduction and degradation of Cr (VI) and MB respectively, is confirmed from ROS scavenging studies. The dye degradation mechanism has been discussed by analyzing the degradation products via UPLC-Q-Tof-MS. The photocatalytic degradation of methylene blue by Sn3O4/SnS2 nanocomposites is significantly enhanced as compared to SnS2 photocatalyst, attributed to Z-scheme heterojunction and the charge carrier mobility.

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Fabrication of Photoactive Electrospun Cellulose Acetate Nanofibers for Antibacterial Applications

Energies ◽

10.3390/en14092598 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2598

Author(s):

Tomasz Czapka ◽

Angelika Winkler ◽

Irena Maliszewska ◽

Ryszard Kacprzyk

Keyword(s):

Methylene Blue ◽

Plasma Treatment ◽

Cellulose Acetate ◽

Flow Rate ◽

High Efficiency ◽

Solvent Mixture ◽

Polymer Properties ◽

Bactericidal Properties ◽

Electrospinning Method ◽

Prepared Material

The aim of the study was to investigate the process of electrostatic fabrication of cellulose acetate (CA) nanofibers containing methylene blue (MB) as a photosensitizer. The electrical, physicochemical, and biocidal properties of the prepared material were given. CA nanofibers were prepared by electrospinning method using a solvent mixture of acetone and distilled water (9:1 vv−1) and different concentrations of CA (i.e., 10–21%). Additionally, methylene blue was implemented into the polymer solution with a CA concentration of 17% to obtain fibers with photo-bactericidal properties. Pure electrospun CA fibers were more uniform than fibers with MB (i.e., ribbon shape). Fiber diameters did not exceed 900 nm for the tested polymer solutions and flow rate below 1.0 mL h−1. The polymer properties (i.e., concentration, resistivity) and other parameters of the process (i.e., flow rate, an applied voltage) strongly influenced the size of the fibers. Plasma treatment of nanofibers resulted in reduced biofilm formation on their surface. The results of photo-bactericidal activity (i.e., up to 180 min) confirmed the high efficiency of inactivation of Staphylococcus aureus cells using fibers containing methylene blue (i.e., with and without plasma treatment). The most effective reduction in the number of biofilm cells was equal to 99.99 ± 0.3%.

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KONDISI OPTIMUM ADSORPSI-FLUIDISASI ZAT WARNA LIMBAH TEKSTIL MENGGUNAKAN ADSORBEN JANTUNG PISANG

Jurnal SainHealth ◽

10.51804/jsh.v2i1.169.1-7 ◽

2018 ◽

Vol 2 (1) ◽

pp. 1

Author(s):

Dheasy Herawati ◽

Setyo Dwi Santoso ◽

Ilma Amalina

Keyword(s):

Methylene Blue ◽

Optimum Condition ◽

Congo Red ◽

Contact Time ◽

Degradation Products ◽

New Technology ◽

Textile Dyes ◽

Dyes Adsorption ◽

Red Dye ◽

Remazol Black

To show that banana inflorescence has effective adsorbent for the adsorption of dyes (congo red, remazol yellow, remazol black and methylene blue) from textile dyes waste and also to detrmine the optimum conditions of variety of pH (4-10), temperature (30Â°C-90Â°C), and contact time (15-105 minute) on the percentage adsorption capacity of banana inflorescence. Textile dyes waste and their degradation products such as aromatic amines are highhly carcinogenic. Adsorption-fluidization is a new technology for treatment of waste water containing different types of dyes. Adsorption-fluidization process is adopted for adsorption of dyes from the textile dyes waste using banana inflorescence in treated form and were analysed by Utraviolet-Visible Spectroscopy. The results showed that the optimum condition from adsorption process of Congo Red dye by banana inflorescence was reached at pH 5 (1.78%), temperature 60Â°C (1.51%) and 45 minute contact time (1.63%). While Remazol Yellow dye optimum at pH 9 (4.29%), temperature 50Â°C (4.65%) and 75 min (1.83%). Another dye, Methylene Blue showed the optimum condition at pH 9 (0.36%), temperature 40Â°C (0.22%) and 45 min contact time of adsorption (0.43%). The last, Remazol Black dye was reached at pH 5 (0.56%), temperature 40Â°C (0.56%) and 75 min contact time (0.56%).

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Influence of plasma treatment on the physical and chemical properties of sisal fibers and environmental application in adsorption of methylene blue

Materials Today Communications ◽

10.1016/j.mtcomm.2020.101140 ◽

2020 ◽

Vol 23 ◽

pp. 101140

Author(s):

Camila Cristina da Silva ◽

Alexandre de Faria Lima ◽

Jéferson Aparecido Moreto ◽

Sandra Dantas ◽

Mariana Alves Henrique ◽

...

Keyword(s):

Methylene Blue ◽

Plasma Treatment ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Environmental Application ◽

Sisal Fibers ◽

Physical And Chemical ◽

And Chemical Properties

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The impregnation of ZnO onto ZSM-5 derived from red mud for photocatalytic degradation of methylene blue

Sustainable Environment Research ◽

10.1186/s42834-021-00113-8 ◽

2022 ◽

Vol 32 (1) ◽

Author(s):

Hellna Tehubijuluw ◽

Riki Subagyo ◽

Yuly Kusumawati ◽

Didik Prasetyoko

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Red Mud ◽

Diffuse Reflectance Spectroscopy ◽

Degradation Products ◽

Nitrogen Adsorption ◽

Liquid Chromatography Mass Spectrometry ◽

X Ray Diffraction ◽

X Ray ◽

Adsorption Desorption

AbstractPhotocatalytic degradation of Methylene Blue (MB) by zinc oxide/zeolite socony mobile-5 (ZnO/ZSM-5) composites was investigated. The ZSM-5 material was synthesized from red mud by a two-step hydrothermal method to which ZnO loadings at different mass ratios were subsequently performed. Characterizations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and scanning electron microscopy were carried out to identify the formation of ZSM-5 and ZnO/ZSM-5. ZSM-5 and ZnO/ZSM-5 have cubic microcrystallite morphologies. ZnO loading in the ZnO/ZSM-5 composites was successfully performed and confirmed by the appearance of wurtzite peaks in the XRD spectra that matched the Joint Committee on Powder Diffraction Standards data. The presence of ZnO in ZSM-5 leading resulted in a decrease in the surface area and pore size as confirming by nitrogen adsorption-desorption isotherm experiments. The band gap of the samples was measured using UV-Vis diffuse reflectance spectroscopy. The optimum photocatalytic degradation of MB was observed at a ZnO loading of 34% w/w dubbed 34-ZnO/ZSM-5. The influence of the initial concentration of MB was also investigated at 80, 90, and 100 mg L− 1 using 34-ZnO/ZSM-5 and ZSM-5. Liquid chromatography–mass spectrometry characterization was performed to analyze the degradation products.

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Thermal/plasma treatment effect on photocatalytic degradation of aqueous solution of methylene blue using Au-doped Fe/TiO2photocatalyst

Desalination and Water Treatment ◽

10.1080/19443994.2014.998715 ◽

2015 ◽

Vol 57 (11) ◽

pp. 5183-5192

Author(s):

Asif Mahmood ◽

Shahid Mahmood Ramay ◽

Yousef S. Al-Zaghayer ◽

Shahid Atiq ◽

Shahid Hussain Ansari

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Photocatalytic Degradation ◽

Plasma Treatment ◽

Treatment Effect ◽

Thermal Plasma

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A SEM and Light Microscope Study of the Epidermal Leaf Structures of the Carnivorous Plant, Sarracenia purpurea, L.

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100065833 ◽

1971 ◽

Vol 29 ◽

pp. 358-359

Author(s):

B. J. Panessa ◽

J. F. Gennaro

Keyword(s):

Methylene Blue ◽

Toluidine Blue ◽

Outer Surface ◽

Microscope Study ◽

Light Microscope ◽

Carnivorous Plant ◽

Sarracenia Purpurea ◽

Inner Surface

Tissue from the hood and sarcophagus regions were fixed in 6% glutaraldehyde in 1 M.cacodylate buffer and washed in buffer. Tissue for SEM was partially dried, attached to aluminium targets with silver conducting paint, carbon-gold coated(100-500Å), and examined in a Kent Cambridge Stereoscan S4. Tissue for the light microscope was post fixed in 1% aqueous OsO4, dehydrated in acetone (4°C), embedded in Epon 812 and sectioned at ½u on a Sorvall MT 2 ultramicrotome. Cross and longitudinal sections were cut and stained with PAS, 0.5% toluidine blue and 1% azure II-methylene blue. Measurements were made from both SEM and Light micrographs.The tissue had two structurally distinct surfaces, an outer surface with small (225-500 µ) pubescent hairs (12/mm2), numerous stoma (77/mm2), and nectar glands(8/mm2); and an inner surface with large (784-1000 µ)stiff hairs(4/mm2), fewer stoma (46/mm2) and larger, more complex glands(16/mm2), presumably of a digestive nature.

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