Preparation of Phosphate Group-Containing Cellulose and Investigation of Its Nickel (Ni2+) Removal Performance
Project no. 24174 · Status: Kapanmış · 2022
Summary
<p>In this study, the removal of Ni2+ ions from aqueous solutions was investigated using cellulose sorbent functionalized with phosphate groups. The effect of sorbent dosage and initial solution pH on Ni2+ removal was examined. Additionally, modeling of ion exchange mechanism and reaction kinetics was carried out through sorption isotherms and kinetic studies. Nickel analysis was performed using atomic absorption spectrometry (AAS).</p><p>The experimental results with phosphate-functionalized cellulose showed that the optimum sorbent dosage for Ni2+ removal was found to be 0.05g, and the working pH range was determined to be 4-6. Kinetic studies revealed that the ion exchange kinetics of the sorbent were quite fast, with 99% of Ni2+ ions being removed within 20 minutes. The kinetic studies indicated that the Ni2+ removal with the prepared sorbent followed pseudo-second-order kinetics, while the equilibrium studies showed compliance with the Langmuir isotherm. Thermodynamic studies conducted with the prepared sorbents demonstrated the spontaneous nature of Ni2+ removal (∆G<0). Regeneration studies showed that the sorbent could be regenerated with 0.1 M HCl, NaCl, or H2SO4.</p><p>Selectivity studies revealed that the presence of Na+, K+, Ca2+, and Mg2+ ions at low concentrations did not affect the Ni2+ removal rate.</p><p> </p><p><strong>Keywords:</strong> Ion exchange, Nickel, Cellulose, Water treatment, Chelation formation.</p>