Synthesis, Characterisations, Adsorptive Performances and Photo-catalytic Activity of Fe 3 O 4 -SiO 2 Based Nanosorbent
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Synthesis, Characterisations, Adsorptive Performances and Photo‑catalytic Activity of Fe3O4‑SiO2 Based Nanosorbent (Fe3O4‑SiO2 BN) Naveen Chandra Joshi1 · Ankita Gaur1 · Ajay Singh1 Received: 13 March 2020 / Accepted: 2 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In the present study, we have synthesised and characterised Fe3O4-SiO2 based nanosorbent (Fe3O4-SiO2 BN) using FESEM, EDX, FTIR and powder XRD methods. Synthesised F e3O4-SiO2 BN was utilised in the adsorption of methylene blue (MB) from aqueous solutions. Optimum conditions for the adsorption of MB by the nanosorbent were found to be 60 min, pH 8 and 1 g dosage of the Fe3O4-SiO2 BN. The equilibrium data of adsorption have been tested with different isotherm and kinetic models and their parameters evaluated. Langmuir isotherm model was best fitted to equilibrium data of adsorption of MB onto Fe3O4-SiO2 BN as compared to Freundlich and Temkin isotherm models. Langmuir equilibrium constant and theoretical mono saturation capacity have been evaluated as 10.277 L/g and 0.0482, respectively. The rate constant (k2) of adsorption of MB on F e3O4-SiO2 BN was found as to be 11.049 g/mg min from pseudo second order kinetic model. The photo-catalytic activity of magnetised Fe3O4-SiO2 BN has also been carried out in the presence of electromagnetic radiation and maximum MB degraded as 97.35% after irradiation time 140 min. Keywords Fe3O4-SiO2 BN · Characterisation · Methylene blue (MB) · Adsorption · Photo-catalytic activity
1 Introduction Dyes are commonly used in textile, rubber, plastic, cosmetics, and leather, paper, drug and food industries. A large number of organic dyes are released into saline and fresh water through such type of industrial activities and caused many serious problems to environment and health of human and other organisms. Most of the dyes and their metabolites are very toxic and carcinogenic in nature even at very low concentrations [1, 2]. The presence of dyes in water bodies is highly visible and reduced the light availability to aquatic organisms. The colored water reduces rate of photosynthesis in aquatic autotrophs and also toxic to some beneficial microorganisms due to reduced light penetration. Dyes with considerable colouring capacity can be removed from water or waste water by using various conventional methods [3, 4]. The conventional methods such as biochemical degradation, * Naveen Chandra Joshi [email protected] 1
Department of Chemistry, Uttaranchal University, Dehradun, India
oxidative degradation, electrochemical degradation, photodegradation, electrocoagulation and adsorption have been used in the removal of dyes from waste water [3, 5–14]. Among such methods, adsorption using a solid support material is highly efficient, low cost and applicable in large scale operations of waste water treatment; recyclability and easy operation makes it more economical and convenient [15]. Methylene blue (MB) is usually used in the dyeing processes particularly for cotton,
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