1. Department of Chemistry, National Institute of Technology, Tiruchirappalli-620015, India 2. Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli-620015, India 3. Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia 4. School of Chemistry, University of Melbourne, Melbourne, Vic-3010, Australia
• Synthesized few-layered MoS2 nanosheets via surfactant-assisted hydrothermal method.
• Synthesized MoS2 nanosheets show petal-like morphology.
• Adsorbent showed 93% of mercury removal efficiency.
• The adsorption of mercury is attributed to negative zeta potential (-21.8 mV).
Recently, different nanomaterial-based adsorbents have received greater attention for the removal of environmental pollutants, specifically heavy metals from aqueous media. In this work, we synthesized few-layered MoS2 nanosheets via a surfactant-assisted hydrothermal method and utilized them as an efficient adsorbent for the removal of mercury from aqueous media. The synthesized MoS2 nanosheets showed petal-like morphology as confirmed by scanning electron microscope and high-resolution transmission electron microscopic analysis. The average thickness of the nanosheets is found to be about 57 nm. Possessing high stability and negative zeta potential makes this material suitable for efficient adsorption of mercury from aqueous media. The adsorption efficiency of the adsorbent was investigated as a function of pH, contact time and adsorbent dose. The kinetics of adsorption and reusability potential of the adsorbent were also performed. A pseudo-second-order kinetics for mercury adsorption was observed. As prepared MoS2 nanosheets showed 93% mercury removal efficiency, whereas regenerated adsorbent showed 91% and 79% removal efficiency in the respective 2nd and 3rd cycles. The adsorption capacity of the adsorbent was found to be 289 mg/g at room temperature.
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