Adsorptive and photocatalytic removal of carcinogenic methylene blue dye by SnO 2 nanorods: an equilibrium, kinetic and
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Adsorptive and photocatalytic removal of carcinogenic methylene blue dye by SnO2 nanorods: an equilibrium, kinetic and thermodynamics exploration Subhash D. Khairnar1 · Dhanraj S. Shirsath1 · Prafulla S. Patil1 · Vinod S. Shrivastava1 Received: 29 January 2020 / Accepted: 26 March 2020 © Springer Nature Switzerland AG 2020
Abstract The present study reports a simple co-precipitation approach for the synthesis of S nO2 nanorods. The S nO2 nanorods were characterized by XRD, SEM, TEM, EDAX, SAED, and FTIR techniques, to examine their structural, morphological, functional group, and elemental properties. The findings of the SEM and TEM reveal the nanorod like morphology. For the adsorptive and photocatalytic removal of methylene blue dye from their aqueous solution the synthesized S nO2 nanorods have been used. The effect on adsorptive and the photocatalytic removal capability of S nO2 nanorods was examined by optimizing the various parameters such as pH, initial dye concentration, contact time and catalyst dose. Tha maximum adsorptive and photocatalytic removal of MB up to the 66% and 94% were obtained at pH = 7 and pH = 2, respectively. Besides, experimental adsorption results were used for the exploration of kinetics and adsorption isotherm (Langmuir and Freundlich), which shows that methylene blue adsorption over S nO2 nanorods follows the pseudo-second-order kinetics with the rate constant K 2 is 1.1 × 10−1 (g/mg/min) and obeys the Langmuir isotherm. However, the thermodynamic parameters were studied, indicating that adsorption is spontaneous and favorable. The adsorptive removal is an endothermic process and pointing towards the chemisorptions nature of the process.
* Vinod S. Shrivastava, [email protected]; Subhash D. Khairnar, [email protected]; Dhanraj S. Shirsath, [email protected]; Prafulla S. Patil, [email protected] | 1Nano‑Chemistry Research Laboratory, G. T. Patil, Arts, Commerce and Science College (Affiliated to Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon (MH), India), Nandurbar, Maharashtra 425412, India. SN Applied Sciences
(2020) 2:822
| https://doi.org/10.1007/s42452-020-2607-5
Vol.:(0123456789)
Research Article
SN Applied Sciences
(2020) 2:822
| https://doi.org/10.1007/s42452-020-2607-5
Graphic abstract
Keywords SnO2 · Nanorods · Langmuir isotherm · Freundlich isotherm · Kinetics · Thermodynamics · Endothermic
1 Introduction The enormous efforts are currently being made in order to develop and modify the nanocrystalline semiconducting materials. The semiconducting materials are designed for a range of applications in the optoelectronics fields, solar cells, catalysis, drug design sensors, etc. [1–5]. The SnO2 nanoparticle with a rutile structure is the most widest studied metal oxide among the different nanocrystalline semiconducting materials. The S nO2 nanoparticles are a semiconductor of the n-type with a 3.6 eV bandgap that makes them a flexible metal oxide [6]. In the area of the catalyst [7], solar
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