Browsing by Author "Mobika, J"

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    CHITOSAN ASSISTED FE-AL DOUBLE LAYERED HYDROXIDE/REDUCED GRAPHENE OXIDE COMPOSITES FOR AS(V) REMOVAL
    (Elsevier, 2020-09-01) Nithya Priya, V; Rajkumar, M; Magesh, G; Mobika, J; Linto Sibi, S P
    In this work, a highly efficient Chitosan assisted Fe-Al double layered hydroxide/reduced Graphene Oxide (FAH-rGO/CS) nanocomposite absorbents were synthesized by using a simple hydrothermal and ex-situ polymerization process for As (V) removal in wastewater. The FAH and CS moieties provoke the adsorption capacity of GO through the interaction of matrix surface with the composite material due to which a high removal capacity of 97% was achieved. The crystalline structure and morphology of the samples were investigated by XRD, SEM, FESEM and HRTEM. The elemental compositions and functional groups of samples were analyzed by EDS and FTIR. The high adsorption capacity of FAH-rGO/CS-4 is attributed to their increased surface areas (122.57 m2 g-1) which were analyzed by N2 adsorption-desorption analysis. The various parameters like the effect of contact time, pH, adsorbent dosage, adsorption isotherms and kinetics were used to study the various adsorption properties of adsorbent and proved to be highly effective adsorbent for As (V) removal.
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    SUSTAINABLE SELENIUM IONS ADSORPTION OF CYCLODEXTRIN AND CELLULOSE FUNCTIONALIZED LAYERED DOUBLE HYDROXIDE/REDUCED GRAPHENE OXIDE NANOCOMPOSITES (Article)
    (Elsevier Ltd, 2025-01) Priya V, Nithya; Rajkumar, M; Rajendran, V; Mobika, J; Sibi S P, Linto; Veena, B; Vijayalakshmi, V; Ahila, P
    In this study, we synthesized the β-Cyclodextrin (CD) and Carboxymethyl Cellulose (CC) functionalized LDH/rGO nanocomposites for the efficient uptake of selenium ions at a neutral pH. The surface morphology and physical properties of the nanocomposites were characterized using X-Ray Diffraction (XRD), High-Resolution Transmission Electron Microscopy (HRTEM), Energy-Dispersive X-Ray Spectroscopy (EDAX), Fourier-Transform Infrared Spectroscopy (FTIR), and N2 adsorption-desorption analysis. Equilibrium adsorption experiments were carried out to optimize crucial parameters such as contact time (60–360 min), adsorbent dosage (0.01–0.1 g/L), and pH (2−11) for efficient selenium ion removal. Kinetic and isotherm studies were conducted to analyze the sorption performance of the nanocomposites. The Langmuir isotherm model provided an excellent fit for the adsorption data (R2 ≥ 0.99), confirming the monolayer adsorption of selenium ions on the adsorbent surface. The maximum adsorption capacity of CC and CD composites was calculated for Se (IV) adsorption as 248.75 mg g−1 and 275.48 mg g−1, for Se (VI) adsorption as 153.37 mg g−1 and 169.64 mg g−1. Additionally, adsorption kinetics was assessed using the pseudo-second-order model, yielding high correlation coefficients (R2 ≥ 0.98). Moreover, the adsorption mechanism, regeneration ability, and the impact of co-existing anions were investigated. Our findings demonstrate the effectiveness of the CD and CC incorporated LDH/rGO biocomposites in selenium ion removal.