Lauryl sulfate@magnetic graphene oxide nanosorbent for fast methylene blue recovery from aqueous solutions

Abstract

Lauryl sulfate is utilized to functionalize magnetic graphene oxide (MGOLS) for fast removal of methylene blue (MB) using batch sorption experiments. The effects of different analytical parameters including medium pH, equilibration time, MGOLS dosage, initial MB concentration and temperature on the % MB removal are investigated. Among different isotherm and kinetic models, the experimental data were best fitted to the Langmuir and pseudo-second-order rate equations. The maximum Langmuir loading capacity reaches 624.42 mg g⁻¹ for MGOLS under optimal conditions. Sorption kinetic of MGOLS is very fast: Approximately 96% of dye extraction was recorded within the first 2 minutes of this sorption process. The sorption mechanism is proposed and the feasibility, thermic and entropic characteristics were evaluated. Sorption and desorption performances of MGOLS are maintained almost constant over five cycles of sorption/desorption. The results concluded MGOLS as an efficient extractor for fast and feasible recovery of MB from aqueous matrices.

Graphical Abstract

Keywords:

• Magnetic recovery
• methylene blue
• functionalized graphene oxide
• sodium lauryl sulfate
• sorbent

Acknowledgments

The authors acknowledge Amr A. Yakout and Medhat A. Shaker (the authors of the manuscript J. Taiwan Inst. Chem. E. 2016, 63, 81–88) for providing the characterization of the studied sorbents in this article.

Disclosure statement

No potential conflict of interest was reported by the author(s).