Adsorption properties of immobilized spores on terbium ions

As an efficient, cheap and environmentally friendly biotechnology, microbial adsorption has been gradually developed and utilized in the separation and recovery of rare earth ions. Through immobilized microbial technology, sodium alginate embedded activated carbon and Bacillus subtilis spores to prepare immobilized particles to treat the wastewater containing rare earth ions. The adsorption effects of immobilized spores plus activated carbon and immobilized activated carbon on Tb(Ⅲ) were compared, and the effects of different conditions on the adsorption of Tb(Ⅲ) by several immobilized adsorbers were explored. The results show that the immobilized spores plus activated carbon have the advantages of both embedding method and adsorption method, with better adsorption effect of Tb(Ⅲ). The removal efficiency can exceed 90% under the conditions of a carbon inclusion amount of 1:100 (activated carbon mass: total mass of solution), the concentration of sporulation suspension of OD₆₀₀ (absorption value of the bacterial solution at 600 nm wavelength) = 2, Tb(Ⅲ) concentration of 100 μmol/L, temperature of 15~ 25℃, pH = 4.5~8.5 and adsorption for 60 min. The adsorption of terbium ions by immobilized spores plus activated carbon is more in line with quasi-first-order dynamics and Langmuir adsorption isotherm model.