The Adsorption Behaviors Of Heavy Metals On The Adsorbents Based On Collagen Fibers

The discharge of heavy metals into water would cause serious environmental problems. Therefore, removal or recovery of heavy metals from wastewaters is one of the most essential issues in views of environmental protection and resource saving. This thesis investigated the adsorption behaviours of Cd(II), V(V) and Cr(VI) on the adsorbents based on collagen fiber, including collagen fiber immobilized tannins and Zr(IV)-impregnated collagen fiber.At first, the adsorption behaviors of Cd(II) on collagen fiber immobilized black wattle tannin, larch tannin and bayberry tannin were investigated. Experimental results showed that the adsorption capacities of the immobilized tannins to Cd(II) were in the sequence of immobilized bayberry tannin > immobilized black wattle tannin> immobilized larch tannin. At pH=6.0, the adsorption capacity of Cd(II) on immobilized bayberry tannin was 0.201mmol/g at 303K. The adsorption isotherms of Cd(II) on immobilized bayberry tannin could be well described by the Langmuir model, and the adsorption capacity of Cd(II) increased with the increase of temperature. The adsorption kinetics investigations indicated that the adsorption rate of Cd(II) on immobilized bayberry tannin could be satisfactorily fitted by the pseudo-second-order rate model, and the adsorption capacities calculated by the model were closed to those determined by actual measurements. The Cd(II) adsorbed on the adsorption column of immobilized bayberry...