Intensifed Pb(II) adsorption using functionalized KCC‑1 synthesized from rice husk ash in batch and column adsorption studies

• Main Authors: Rosalyza, Hasan, R. S. R., Mohd Zaki, H. D., Setiabudi, R., Jusoh, A. A., Jalil, M., Shokouhimehr
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg 2022
• Subjects: TP Chemical technology
• Online Access: http://umpir.ump.edu.my/id/eprint/35801/1/Intensified%20Pb%28II%29%20adsorption%20using%20functionalized%20KCC-1%20synthesized%20from%20rice%20husk%20ash%20in%20batch%20and%20column%20adsorption%20studies.pdf; http://umpir.ump.edu.my/id/eprint/35801/; https://doi.org/10.1007/s13204-022-02689-y; https://doi.org/10.1007/s13204-022-02689-y

An attempt to investigate the feasibility of 3-aminopropyltriethoxysilane (3-APTES)-functionalized KCC-1 (NH2/KCC-1) prepared from rice husk ash (RHA) for Pb(II) removal was executed. An effective functionalization of fibrous silica nanospeheres (KCC-1) by NH3 was confirmed by FTIR analysis. The optimized condition of Pb(II) adsorption in the batch system was at an initial Pb(II) concentration (X1) of 307 mg/L, adsorbent dosage (X2) of 2.43 g/L, and time (X3) of 114 min, with the Pb(II) removal (Y) of 90.1% (predicted) and 91.2% (actual). NH2/KCC-1 can be regenerated by nitric acid (0.1 M) with insignificant decline of Pb(II) removal percentage (adsorption=91.2–67.3%, desorption=77.7–51.9%) during 5 cycles adsorption–desorption study. The examination of column adsorption study at a varying flow rate (1–3 mL/min) and bed height (10–20 cm) showed a good performance at a lower flow rate and higher bed height. Both Adam–Bohalt model and Thomas model displayed a good correlation with experimental data. However, Thomas model was more suitable due to the high correlation coefficient, R2=0.91–0.99. This study revealed the intensified Pb(II) adsorption using NH2/KCC-1 synthesized from RHA in batch and column adsorption studies.