In this study, adsorption is an attractive for the removal of industrial dyes from aqueous simulated wastewaters is reported. The ternary graphene oxide-TiO₂-SiO₂ (GTS) nanocomposite was synthesized by sol-gel method. The as-synthesized nanocomposite was characterized by XRD, BET, FT-IR, SEM-EDAX and TEM analysis. It was found that the synthesised nanocomposite has excellent adsorption and photocatalytic degradation abilities for the removal of cationic dyes, methylene blue (MB) and crystal violet (CV) owing to its homogeneous mesoporosity with a BET surface area of 583.15 m²/g. Furthermore, the adsorption mechanism of these cationic dyes follows pseudosecond-order kinetic model. In addition, the GTS nanocomposite showed maximum adsorption efficiency over MB and CV around 384.62 mg/g and 188.68 mg/g respectively. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) calculated from the temperature dependent isotherms suggested that the adsorption was spontaneous and endothermic in nature. The study on the reusability of the GTS nanocomposite showed that, even after five succeeding cycles, the capacity of the adsorbent was almost identical.
Abstract Herein, the Mg-S codoped TiO 2 nanoparticles (NPs) were synthesized by the sol-gel method, and their photocatalytic activity of MB (Methylene Blue) dye was examined under simulated visible light. The crystal structure, morphology analysis, optical properties, and photocatalytic performance of synthesized nanoparticles (NPs) were characterized by XRD, FTIR, SEM with EDS, TEM, UV-DRS, and UV-Vis spectroscopy. Results showed that Mg/S codoped TiO 2 NPs had pure anatase structure with spherical morphology. The band gap energy Mg/S codoped TiO 2 was decreased from 3.12 eV to 2.78 eV by adding the doping and codoping of Mg and S into TiO 2 NPs. The Mg/S codoped TiO 2 NPs showed excellent photocatalytic activity compared to that of pristine TiO 2 , Mg-TiO 2, and S-TiO 2 NPs. The maximum degradation efficiency of MB was achieved at 94.8% for Mg/S codoped TiO 2 NPs. Meanwhile, the possible photocatalytic mechanism of Mg/S codoped TiO 2 was discussed. The current investigation delivers a promising strategy to promote photocatalytic activity for the elimination of waterborne contaminants.
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