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

Abstract

<em>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 </em><em>TEM, </em><em>FT-IR, and UV-Vis </em><em>spectrometry analysis. In the batch experimental set-up, optimum conditions for quantitative removal</em><em> of Methylene green by [SnS-NP-C] was attained following searching effect of variables such as </em><em>adsorbent dosage (0.05-0.35 g), contact time (10-120 min), solution pH (6-10), and initial concentration of dye (10–60 </em><em>mg/L</em><em>) on the adsorption process was investigated</em><em>. 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 </em><em>adsorbent dosage and initial methylene green concentration show that maximum dye was sequestered</em><em> 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]. </em><em>The present procedure is green and offers advantages such as shorter reaction time, simple workup, and high percentage removal.</em>