Adsorption of Hazardous Methylene Green Dye from Aqueous Solution onto Tin Sulfide Nanoparticles Loaded Activated Carbon: Isotherm and Kinetics Study

Abstract

In this research, a novel adsorbent, tin sulfide nanoparticles coated on activated carbon [SnS-NP-C] was synthesized by a simple, low cost and efficient procedure for the removal of methylene green from aqueous solutions. Subsequently, this novel material characterization and identification has been completed by different techniques such as TEM, FT-IR, and UV-Vis spectrometry analysis. In the batch experimental set-up, optimum conditions for quantitative removal of Methylene green by [SnS-NP-C] was attained following searching effect of variables such as adsorbent dosage (0.05-0.35 g), contact time (10-120 min), solution pH (6-10), and initial concentration of dye (10–60 mg/L) on the adsorption process was investigated. Optimum values were set at pH of 8.0, 0.25 g of [SnS-NP-C] at removal time of 50 min. Kinetic studies at the various adsorbent dosage and initial methylene green concentration show that maximum dye was sequestered within 10 min as a sort time. The adsorption of methylene green follows the pseudo-second-order rate equation in addition to the interparticle diffusion model (with the removal of more than 99%) at all conditions. Equilibrium data fitted well with the Langmuir model at all amount of adsorbent, while maximum adsorption capacity was 14.22 mg/g for 0.2 g of [SnS-NP-C]. The present procedure is green and offers advantages such as shorter reaction time, simple workup, and high percentage removal.