Adsorption of rhodamine-B by polypyrrole Sn (IV) tungstophosphate nanocomposite cation exchanger: Kinetic-cum-thermodynamic investigations

Synthesis of an organic-inorganic polypyrrole Sn(IV) tungstophosphate (Ppy-SWP) nanocomposite cation exchanger is used to study the adsorption of Rhodamine B (RH-B) utilizing batch adsorption by in-situ chemical oxidative polymerization of pyrrole (Ppy) with Sn(IV) tungstophosphate (SWP). FT-IR, XRD, SEM, TEM, and TGA were used to examine the synthesized material's structural, morphological, and chemical features, revealing the successful Ppy-SWP nanocomposite synthesis. The impact of several parameters, such as pH, adsorbent amount, contact time, and starting dye concentration on RH-B adsorption onto Ppy-SWP, was investigated. The ion exchange capacity (IEC) and maximum level of RH-B dye adsorbed onto Ppy-SWP were reported to be 2.7 meq/g and 209.13 mg/g respectively. Kinetic (pseudo-first order, pseudo-second order, and intraparticle diffusion) and isotherm (Langmuir, Freundlich, Temkin, and Redlich-Peterson) models were used to pick the ideal match for the adsorption data. The Langmuir and Redlich-Peterson isotherm models fit the adsorption data well, while the pseudo-second order model best describes the kinetics data of RH-B adsorption. According to the computed thermodynamic variables standard-free energy, enthalpy, and entropy, the RH-B adsorption onto the Ppy-SWP is a spontaneous, endothermic, and physical sorption process. Even after seven cycles, regeneration experiments revealed an efficiency of greater than 80%.

Automated summary

In this study, an organic-inorganic nanocomposite cation exchanger, polypyrrole Sn(IV) tungstophosphate (Ppy-SWP) was synthesized and used for the adsorption of Rhodamine B (RH-B). The results showed that Ppy-SWP had high adsorption capacity for RH-B and maintained good efficiency even after multiple regeneration cycles.