Biosorption of neodymium(III) and cerium(III) ions by Loquat leaves (Eriobotrya japonica) kinetics and thermodynamic studies

Loquat leaves as biosorbent have been proven for removal of neodymium(III) and cerium(III) ions from aqueous solution through batch contact technique as a function of biosorbent dosage, temperature, initial metal concentration and contact time. Loquat leaves properties were determined by elemental analysis, Fourier-transform infrared spectroscopy and thermogravimetric analysis. The percent uptakes of neodymium(III) and cerium(III) ions by Loquat leaves were 50% and 70% respectively at 25 degrees C. The pseudo-second-order equation most accurately describes the sorption process. While thermodynamic studies showed that the biosorption process is spontaneous and endothermic. Langmuir model fits the sorption isotherm with maximum capacities of 42 and 54 mg/g for neodymium(III) and cerium(III) ions respectively. Desorption studies using 0.1 M HNO3 indicate that the highest percent recovery was achieved for neodymium(III) (similar to 70%) than for cerium(III) ions (similar to 60%).

Automated summary

Loquat leaves have been proven effective as a biosorbent for removing neodymium(III) and cerium(III) ions from aqueous solutions. The sorption process is accurately described by the pseudo-second-order kinetic equation, while the Langmuir model fits the sorption isotherm well. Desorption studies showed higher percent recovery for neodymium(III) ions compared to cerium(III) ions.