Degradation of Methylene Blue using Graphene Oxide-Tin Oxide Nanocomposite as Photocatalyst

Azim, M. Bakhtiar; Tanim, Intaqer Arafat; Rezaul, Riad Morshed; Tareq, Rizwan; Hossain, Rahul, Arafat; Kurny, A. S. W; Gulshan, Fahmida

doi:10.48550/arxiv.1806.06481

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“…Optical measurements of the tested photosensitizers were recorded immediately and a few days after treatment of the ticks show high absorbance, especially for methylene blue owing to their photostability and photoliability which suggested they can be used in sunlight for a long time. Methylene blue is stable enough to be used in sunlight and not easily degraded and needs additional help for its degradation as titanate nanoparticles [62] and graphene oxide or tin oxide [63][64][65].…”

Section: Discussionmentioning

confidence: 99%

Acaricide resistance and novel photosensitizing approach as alternative acaricides against the camel tick, Hyalomma dromedarii

Mohammed

Baz

Ibrahim

et al. 2022

Photochem Photobiol Sci

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The control of the camel tick, Hyalomma dromedarii is very crucial. This study evaluated the novel toxicity of photosensitizers and Phoxim insecticide against H. dromedarii males using the adult immersion tests. Ticks were subjected to sunlight for 10 min post-treatment (PT). The optical characters of the applied materials were determined by UV–Vis spectroscopy (250–900 nm wavelengths). The intensity of spectra decreased as dye concentration decreased. The optical bandgap energies of the dyes at different concentrations were not changed as the concentration changed and decreased as the absorption peak of individual dyes red-shifted. The mortalities 72 h PT reached 42.2%, 44.4%, 51.1%, 71.1%, 46.7%, 48.9%, 44.4%, and 55.6% for chlorophyllin, echinochrome, field stain, methylene blue, phthalocyanine, rhodamine 6G, riboflavin, and safranin, respectively. Methylene blue recorded the highest median lethal concentration (LC50 = 127 ppm) followed by safranin, field stain, rhodamine 6G, phthalocyanine, echinochrome riboflavin, and chlorophyllin (LC50 = 209, 251, 271, 303, 324, 332, and 362 ppm, respectively, 72 h PT). Their median lethal time, LT50, values PT with 240 ppm were 45, 87, 96, 72, 129, 115, 131, and 137 h, respectively. The relative toxicities of the LC50 values 72 h PT showed that chlorophyllin, echinochrome, field stain, methylene blue, phthalocyanine, rhodamine 6G, riboflavin, and safranin were 3.2, 3.6, 4.6, 9.1, 3.8, 4.3, 3.5, and 5.6 times, respectively, more effective than Phoxim. Methylene blue, safranin, and field stain showed a broad absorbance area indicating a large photoactivity and better phototoxicity and could be used as alternative agents to synthetic acaricides. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%