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Graphene Oxide and Its Nanocomposite for Wastewater Treatment
Published in Dhiraj Sud, Anil Kumar Singla, Munish Kumar Gupta, Nanomaterials in Manufacturing Processes, 2023
Arshpreet Kaur, Harshita Bagdwal, Gagandeep Kaur, Dhiraj Sud
Methyl orange, an azo anionic dye having a size of 1.62 × 0.94 × 0.29 nm3, possesses the high reliance of color on pH as the dye shows red color in acidic medium and turns to yellow when medium changes to basic. The published reports on synthesized polymer–GO-based nanocomposites for the adsorption of methyl orange dye have been discussed. Tan and Hu synthesized a composite of β-cyclodextrin and GO to enhance the stability and adsorption capacity of GO via the formation of the covalent bond between GO and β-cyclodextrin. In this report, the adsorption of methyl orange dye was investigated by availing β-cyclodextrin and GO composite as an adsorbent, and the highest adsorption capacity was observed 328.2 mg/g (Tan P. et al., 2017). The significant adsorption of dye onto the composite surface may be due to the following reasons:Strong pi–pi interactions between dye and composite because of the aromaticity of dye and the presence of low content of oxygen-containing moieties in the composite.High percentage grafting of β-cyclodextrin onto GO surface.The significant specific surface area of β-cyclodextrin and GO composite provides the adsorption sites for dye adsorption.
Determination of Free Chlorine Content of the Atmosphere (Methyl Orange Method)
Published in James P. Lodge, Methods of Air Sampling and Analysis, 2017
Near a pH of 3.0 the color of a methyl orange solution ceases to vary with acidity. The dye is quantitatively bleached by free chlorine, and the extent of bleaching can be determined colorimetrically. The optimum concentration range is 0.05 to 1.0 ppm Cl2 in ambient air (145 µg to 2900 µg /m3 at 25°C and 101.3 kPa (1,2,3).
Ionic liquid treated leaves of Juglans regia as an adsorbent for the removal of methyl orange dye: experimental, computational, and statistical approach
Published in International Journal of Phytoremediation, 2023
Shahid Shafi Shah, Taniya Sharma, Dinesh Kumar, Sapna Sharma, Rajinder K. Bamezai
The dye, which gets discharged as waste aqueous pollutant in various water bodies (Lafi and Hafiane 2016; Iwuozor et al. 2021), is chosen based on its application in the laboratory for titration, textile, printing paper, food, pharmaceutical industries, research laboratories, etc. Methyl orange is used as titrant in acid-base titrations as its aqueous solution is basic with yellow color while in acidic medium, due to protonation of methyl orange, the aqueous solution shows red color (Jalil et al. 2010). Thus, methyl orange dye can act as Hammet acidity function to measure acidity of solutions of strong acids (Hammett and Deyrup 1932). These titrated solutions enter into water bodies directly or indirectly without any proper disposal management system. Further, methyl orange is an organic coloring compound used for adding color to the final products originating from different industries like textiles, leather, rubber, painting, pulp, cosmetics, and pharmaceuticals (Pavithra et al. 2019). Thus, the aforementioned processes give birth to bulk quantity of methyl orange-based effluents. The carcinogenic, fatal nature and low biodegradability of methyl orange dye tempted us to check the adsorption capacity of the tailored adsorbents.