Smriti Arora; Ritika Nagpal; Sweta Mishra; SMS Chauhan
Abstract
A fast, sensitive, label-free, and organic cationic dye adsorbent has been developed by hydrothermal sulfonation reaction on reduced graphene oxide. The layered graphene sheet provides a significant surface area, high intrinsic mobility while presence of –SO3H groups on both sides of sheet render ...
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A fast, sensitive, label-free, and organic cationic dye adsorbent has been developed by hydrothermal sulfonation reaction on reduced graphene oxide. The layered graphene sheet provides a significant surface area, high intrinsic mobility while presence of –SO3H groups on both sides of sheet render strong hydrophilicity and good dispersibility in water. The dye adsorption process is followed using UV–Visible spectroscopy, while the material before and after adsorption has been characterized by Raman, Powder XRD, FT-IR, TGA, TEM, SEM analysis. Optimum experimental parameters were determined to be acidic for Rhodamine B (RB) and basic for Methylene Blue (MB), temperature 30°C, adsorbent dosage50 mg/L. The sorption equilibrium data were modeled using various isotherms, where the data best fitted to Freundlich isotherm for RB (qmax = 76.68 mg/g), while Langmuir isotherm for MB (qmax = 564.97 mg/g). The results indicate that the heterogeneous adsorbent can be applied for efficient dye removal from industrial effluent and contaminated natural water. Copyright © 2017 VBRI Press.
Suranjan Sikdar; Sutanuka Pattanayek; Tanmay K Ghorai
Abstract
The Bi2MoZnO7 nanocomposites have been successfully synthesized via co-precipitation and solid state method and followed by a low temperature calcinations treatment process. We find that such a Bi2MoZnO7 nanocomposite exihibits higher photoctatalytic activity and stability than Bi2MoO6, Bi2O3 and ZnO ...
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The Bi2MoZnO7 nanocomposites have been successfully synthesized via co-precipitation and solid state method and followed by a low temperature calcinations treatment process. We find that such a Bi2MoZnO7 nanocomposite exihibits higher photoctatalytic activity and stability than Bi2MoO6, Bi2O3 and ZnO towards the aqueous phase degradation of Rhodamine B (RhB) under visible light (420 nm < λ). The presence of Bi3+/Mo6+/Zn2+ ions in Bi2MoZnO7 and formation of defects in the lattice is believed to play an essential role in affecting the photoreactivity. The different types of active species scavengers are also play the photocatalytic process. The synthesized Bi2MoZnO7 nanocomposites were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), SEM, TEM, EDAX and IR techniques. The crystallite sizes, particle and grain sizes are 12±2, 5±1 and 100±5 nm, respectively. The rate of degradation of Rhodamine B by BMZ in aqueous phase is 7 times (40.70×10-3min-1) faster in comparison to pure Bi2O3/ZnO. Copyright © 2017 VBRI Press.
