RT Journal Article
T1 Fractal-like kinetics for adsorption of Pb (II) on graphene oxide/hydrous zirconium oxide/crosslinked starch bio-composite: Application of Taguchi approach for optimization
A1 Rahman, Nafisur
A1 Raheem, Abdur
A1 Al-Kahtani, Abdullah A.
A1 Pandit, Bidhan
A1 Ubaidullah, Mohd
AB This study deals with the decontamination of Pb (II) from aqueous environment using graphene oxide/hydrous zirconium oxide/crosslinked starch bio-composite (GZS-BC). Various instrumental techniques were used to characterize the GZS-BC. The main factors of Pb (II) sorption were optimized by Taguchi method. Under optimum conditions, (adsorbent dose: 40 mg, contact time: 180 min and initial Pb (II) concentration: 50 mg/L) maximum removal efficiency (98.50%) was achieved at pH 6. Various isotherm models were tested to fit the adsorption data and Freundlich isotherm model was the best fit model with high R2 values (0.9977–0.9983) and low values of χ2 (0.01–0.02) and APE (0.90–1.14). The kinetic data were investigated using classical and fractal-like kinetic equations. The fractal-like mixed 1,2-order kinetic model was the best fit model which pointed towards heterogeneous surface of GZS-BC with more than one type of sorption sites. Thermodynamic study shows that Pb (II) sorption onto GZS-BC was spontaneous and endothermic in nature. The values of ΔG° indicated that physisorption together with chemisorption was responsible for uptake of Pb (II).
PB Elsevier
SN 1018-3647
SN 2213-686X (online)
YR 2023
FD 2023-07-01
LK https://hdl.handle.net/10016/39386
UL https://hdl.handle.net/10016/39386
LA eng
NO The authors are highly thankful to Department of Chemistry, AMU assisted through UGC DRS-SAP, DST-PURSE and DST-FIST programs for providing necessary facilities. The authors extend their sincere appreciation to the Researchers Supporting Project Number (RSP2023R266) King Saud University, Riyadh, Saudi Arabia for the support.
DS e-Archivo
RD 1 sept. 2024