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Cationic Dyes - Springer Nature

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Last Updated: 02 October 2022

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Natural kaolinite-based hierarchical porous microspheres as effective and highly recyclable adsorbent for removal of cationic dyes

Based on a naturally layered kaolinite microsphere with three-dimensional design, a hierarchical porous kaolinite microsphere with three-dimensional structure was produced in this research, according to an environmentally friendly direct hydrothermal approach. The HPKS microsphere with 3D hierarchical porous structure was constructed with numerous nanospheres made from ultrafine aluminosilicate flakes, according to the characterization results. The effect of contact time, solution pH, initial dye concentration, adsorbent dosage, and foreign ions on methylene blue adsorption capability was systematically investigated. The synthesized HPKS with a larger surface area and excellent adsorption capacity toward MB as well as excellent selectivity for cationic MB dyes over anionic methyl orange and competitive metal ions. The sorption isotherm study shows the chemisorption of electrostatic attraction between the cationic MB molecules and HPKS' negative charged surfaces. In a wide variety of solution pH values, the MB removal rate is more than 99%, which is more significant.

Source link: https://doi.org/10.1007/s11356-022-20986-5


Cationic dye adsorption on doped, self-doped and metallopolymers of polyaniline-thiacalix[4]arene

X-ray diffraction spectra, scanning electron microscopy, atomic force microscopy, and transmission electron microscopy measurements established the polymer nanocomposites' structure. In terms of isotherm, kinetic, and thermodynamic stand point for methylene blue and malachite green dyes, synthesized conductive nanocomposites were extensively tested in this study, and adsorption was rigorously investigated in optimal pH = 8 and adsorption time of 3 h. High correlation with Langmuir isotherm model was found by kinetic results, with q _m as high as 151 for malachite green absorption on thiacalix[4] arene-doped PANI and the best fit with the pseudo-second-order kinetic model, according to the kinetic results. To display proportionate Gibbs energy, minimum enthalpy, and standard entropy changes, a thermodynamic investigation was conducted. The highest capacity shift for the endothermic adsorption was reported to be 4. 09 mg gu22121.

Source link: https://doi.org/10.1007/s13762-022-04555-4


Comparative removal of hazardous cationic dyes by MOF-5 and modified graphene oxide

Malachite green is often used for dying purposes and as an inhibitor in aquaculture, food, health, and chemical industries due to its cytotoxic properties. Hence, MG removal is absolutely necessary to protect the ecosystem and human health. MG removal was investigated in Herein, MOF-5 and aminated corn Stover's aminated graphene oxide of typical adsorbents of metalu2013organic-frameworks and carbon-based classes for MG removal. Both MOF-5 and ACS-RGO had a limited surface area and total pore volume of 507. 4 and 389. 0 m2/g, respectively, with 0. 271 cm3/g and 0. 273 cm/3/g. ACS-RGO was superior for MG absorption, and the kinetic rate coefficient for ACS-RGO was 7. 2 times higher than MOF-5. In a wide variety of pH ranges, MG removal remained high in ACS-RGO. After adding ACS-RGO at doses above 0. 5 g/L, Dye removal was evident in a few seconds. ACS-RGO removed MG in multilayer with a remarkable adsorption capacity of 1088. 27 mg/g.

Source link: https://doi.org/10.1038/s41598-022-19550-5


Simultaneous decolorization of anionic and cationic dyes by 3D metal-free easily separable visible light active photocatalyst

For the removal of a mixture of methylene blue and methyl orange dyes, the PUF/UGCN ratio was optimized. The X-ray diffraction and Fourier transform infrared findings led to the successful preparation of UGCN and PUF, as well as the fact that the PUF/UGCN composite incorporates the characteristics of both pure and infrared materials. The composite photocatalyst with a PUF/UGCN mass ratio of 4 achieved improved decolorization of MO and almost identical decolorization of MB as UGCN, relative to the original components. The ideal conditions for MB/MO mixture decolorization were found in the composite photocatalyst's neutral pH and 1 g/L. Hydroxyl radicals were the most prevalent in the degradation of MB, with hydroxyl radicals being the most influential factor in MO degradation. Supporting UGCN into PUF maintained the photocatalytic effectiveness of UGCN in the wake of MB decolorization and improved its effectiveness toward MO.

Source link: https://doi.org/10.1007/s11356-022-22838-8

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions