Jump to main content
Jump to site search


Polyol asserted hydrothermal synthesis of SnO2 nanoparticles for fast adsorption and photocatalytic degradation of methylene blue cationic dye

Abstract

Methylene Blue (MB), a toxic dye is predominantly used in various industries. It is environmentally hazardous and harmful to human beings and aquatic species. Catalyst nanoparticles (NPs) play an important role in remediation of the MB dyes. Here, we have reported fast adsorption and efficient degradation of MB dye by nanostructured SnO2 catalysts prepared in various glycol solvents such as ethylene glycol (EG), diethylene glycol (DEG), tetraethylene glycol (TEG), polyethylene glycol 400 (PEG4) and polyethylene glycol 600 (PEG6). XRD patterns reveals the formation of pristine rutile phase of SnO2 with average crystallite sizes from 2 to 3.5 nm with respect to the molecular weight of polyol solvents. Use of polymeric glycol of various molecular weight gives variation in morphology of SnO2 catalyst with different specific surface area and active sites owing to difference in chemical reactivity. Quantum confinement effect and defect bands are observed in optical spectrum of SnO2 nanostructures due to the presence of oxygen vacancy or tin interstitial. The nanomaterials possess higher colloidal stability with negative zeta potential value of more than 30 mV. The above mentioned physical and chemical properties have significant catalytic effect towards the adsorption (max ~73%) and degradation (max ~97%) of MB dye. The negative zeta potential due to polyol functionalization, smaller particle size and high specific surface area of SnO2 NPs possess additional advantage of ultrafast adsorption of MB cationic dye. Different isotherm models are discussed for experimental equilibrium data and it is well fitted with Langmuir model that confirmed the monolayer adsorption of dye on SnO2 surface. Also, various physiochemical parameters such as pH of dye solution, catalyst dosage and wavelength of light irradiation were studies and recyclability of catalyst were verified. The catalysts also provide significant photo degradation for rose bengal anionic dye. Keywords: Nanostructured tin oxide, defect bands, glycol solvent, adsorption-desorption, isotherms, dye degradation, monolayer adsorption

Back to tab navigation

Supplementary files

Publication details

The article was received on 06 Sep 2017, accepted on 27 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03341A
Citation: New J. Chem., 2017, Accepted Manuscript
  •   Request permissions

    Polyol asserted hydrothermal synthesis of SnO2 nanoparticles for fast adsorption and photocatalytic degradation of methylene blue cationic dye

    B. Rani, S. Punniyakoti and N. K. Sahu, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03341A

Search articles by author

Spotlight

Advertisements