Adsorption Behavior of Phosphate on Metal-Ions-Loaded Collagen Fiber

The novel adsorbents, metal-ions-loaded collagen fiber (MICF), were prepared by loading Zr(IV) and Fe(III) onto collagen fiber, and the adsorption behavior of phosphate in aqueous solutions on MICF was investigated. The results of batch experiments indicated that the high adsorption capacities of phosphate take place in the pH range of 3.0-6.0. The adsorption capacity of phosphate on Zr-ICF is larger than that on Fe-ICF because of the higher chelating ability of Zr(IV) with phosphate. For example, the adsorption capacities of phosphate on Zr-ICF and Fe-ICF are 0.9193 and 0.8420 mmol/g at 303 K, respectively. The adsorption isotherm of MICF to phosphate can be well-described by the Langmuir equation. The adsorption kinetics of MICF to phosphate can be well-described by the pseudosecond-order rate model, and the adsorption capacities calculated by the model were close to those actually determined. The practical application of MICF on the effective removal of phosphate from aqueous solutions could be expected.