Adsorption of Benzyl Paraben Dye from Aqueous Solutions Using synthesized Mn-doped PbS (PbS:Mn) nanoparticles

Abstract

Precipitation method was applied to synthesize pure and PbS (1−x) Mn (x = 0%, 5%, 10% and 15%) nanoparticles. There have been reports on the usefulness of Mn-doped PbS (PbS:Mn) nanoparticles in removal Benzyl Paraben (BP) dye from aqueous solutions. The distinctive features of this novel material were identified using different techniques like BET, XRD, SEM and FT-IR. The optimal conditions for the (BP) dye removal were found to be 2, 15 min, 100 mg/L, and 0.1 g for pH, contact time and adsorbent dosage, respectively. Regarding the Kinetic models both pseudo-first-order and pseudo-second-order diffusion models of (BP) dye revealed that the kinetic of adsorption process followed second-order equation model. After using various Isotherm models to fit the experimental equilibrium data with, the adequacy and applicability of Langmuir model has been proven. Adsorption mechanism for these adsorbents was considered to be physical which was confirmed by the E (kJ mol-1) obtained from Dubinin–Radushkevich isotherm for pure PbS, PbS/Mn-5%, PbS/Mn-10% and PbS/Mn-15% were roughly -710.0, -780.0, -830.0 and -920.0 (kJmol-1) respectively. The thermodynamic parameters including enthalpy, entropy and Gibbs energy were calculated for the adsorption of these (BP) dye using Mn-doped PbS nanoparticles suitable, spontaneous and exothermic. The maximum adsorption capacity of the (BP) dye for pure PbS, PbS/Mn-5%, PbS/Mn-10% and PbS/Mn-15% were roughly 80.0, 105.0, 131.0 and 145.0 mg/g, respectively. The findings revealed the appropriateness of Mn-doped PbS (PbS:Mn) nanoparticles as an adsorbent for (BP) dye deletion from aqueous solutions.