Polymeric Substitution of Triazole Moieties in Cellulosic Schiff Base for Heavy Metal Complexation Studies

The adsorption of metal ions from wastewater using Schiff base cellulose bearing pendulant heterocyclic chelating groups (MC-Tz) as a sorbent is the subject of this paper. Solid state 13C-NMR, FT-IR, SEM, and XRD spectroscopy, as well as TGA and XRD were utilized to examine the adsorbent. The batch sorption process used pH, adsorbent dose, initial adsorbate concentration, temperature, as well as contact time to calculate the metal ion levels. The optimum pH-6.0, with the complexation reaction and ion exchange phase as the mechanisms at work. To investigate the equilibrium concentration and temperature-dependent rate constants, various models, such as the Langmuir, Freund, Temkin, and Redlich-Peterson adsorption isotherm were utilized. Maximum adsorption capacity of the modified cellulose (MC-Tz) towards Lead(II), Copper(II), Nickel(II), and Cadmium(II) were found to be 453.2, 485.5, 473.2, and 455.6 mg/g respectively. A Kinetic study shows that the Langmuir is more in agreement with the Pseudo-second order Kinetic model. Adsorption-Desorption experiments over four cycles demonstrated the feasibility of the sorbent's regeneration potential and the measured values of enthalpy and entropy explain the essence of the adsorption process. The objective of this research is to discover non-toxic, environmentally friendly adsorbent biodegradable components and to conduct evaluations to determine their use in wastewater treatment.

Automated summary

This paper investigates the use of Schiff base cellulose as a sorbent to remove metal ions from wastewater. The optimal pH, complexation reaction, and ion exchange mechanism were identified, and different adsorption isotherm models indicated the maximum adsorption capacity of the modified cellulose for lead, copper, nickel, and cadmium. Kinetic studies showed that the Langmuir adsorption isotherm is in agreement with the Pseudo-second order kinetic model.