A study on removal of Cr(III) from aqueous solution using biomass of Cymbopogon flexuosus immobilized in sodium alginate beads and its use as hydrogenation catalyst

Publication date: Available online 25 May 2019Source: Journal of the Taiwan Institute of Chemical EngineersAuthor(s): Aradhana Basu, Saroj Sekhar Behera, Suchintak Dash, Shirsendu Banerjee, Sanjay Sarkar, Chinmaya Kumar Mohanty, Nabin Kumar Dhal, Pankaj Kumar Parhi, Suraj K. TripathyAbstractA novel strategy for wastewater recycling by removing Chromium [Cr(III)] from water, utilizing the treated water for agricultural purposes and the saturated adsorbent used as the catalyst for p-nitrophenol reduction was successfully incorporated for sustainable environmental application. Removal of Cr(III) by adsorption on Cymbopogon flexuosus waste material entrapped within sodium alginate beads was investigated. Sorption behavior of Cr(III) on to the biosorbent phase showed to follow pseudo first order kinetic model. The thermodynamic variables such as ∆G (−2.59 kJ mol−1), ∆H (4.57 kJ mol−1) & ∆S (0.024 J mol−1 K−1) was evaluated and the corresponding values ensure on favoring endothermic nature of adsorption. Isotherm studies strongly supports on Freundlich model (R2 = 0.99) rather than Langmuir isotherm model (R2 = 0.93), Temkin (R2 = 0.89) and Dubinin-Radushkevich (R2 = 0.77) confirming on multilayer chemisorption behaviour with immobilized Cymbopogon flexuosus having the maximum loading capacity of 121.64 mg.g−1. The sorption of Cr(III) by immobilized Cymbopogon flexuosus was quantitative (99.9%) at the optimum condition: Cr(III) concentratio...
Source: Journal of the Taiwan Institute of Chemical Engineers - Category: Chemistry Source Type: research