Removal of Pb(II) ions by cellulose modified-LaFeO(3) sorbents from different biomasses.

LaFeO(3) perovskite is prepared by the cellulose-modified microwave-assisted citrate method using two different biomasses as a cellulose source; rice straw (RS) and banana peel (BP). The prepared samples are assigned as LaFeO(3)/cellulose-RS and as LaFeO(3)/cellulose-BP, respectively. Raman Spectra prove the presence of perovskite and cellulose phases, as well as biochar resulted from the thermal treatment of the cellulose. LaFeO(3)/cellulose-RS has a cauliflower morphology while, two phases are observed for LaFeO(3)/cellulose-BP, mesoporous cellulose phase and octahedral LaFeO(3) nanoparticles as shown by scanning electron microscope (SEM) images. LaFeO(3)/cellulose-BP has higher porosity and larger BET surface area than LaFeO(3)/cellulose-RS. Both samples are applied for the removal of Pb(II) ions from aqueous solution by adsorption. The adsorption follows Langmuir isotherm, with maximum adsorption capacities of 524 and 730 mg/g for LaFeO(3)/cellulose-RS and LaFeO(3)/cellulose-BP, respectively. Cellulose precursors from different biomasses affect structural and morphological properties of LaFeO(3)/cellulose samples as well as the sorption performance for Pb(II) ions. BP is more recommended than RS, as a biomass, in the present study.