关键词: 胶原纤维, 固化单宁, Cu²⁺吸附, 环境污染防治

Abstract: Using collagen fibre as matrices, the immobilized tannins adsorbents based on black wattle, larch and myrtan tannins were prepared through crosslinking reaction.As novel adsorbents, their ability of recovering Cu²⁺ from waste water was studied.Experiments showed that adsorption isotherms of immobilized tannins for Cu²⁺ could be described by Freundlich model and their adsorption capacities were in the sequence of:immobilized myrtan tannin>immobilized black wattle tannins>immobilized larch tannin.Furthermore, adsorption characteristics of immobilized black wattle tannin that has higher thermal stability were investigated in details.It was found that influence of temperature on adsorption isotherms was not obvious, whilst effect of pH value was significant.Higher pH value of solution led to higher equilibrium adsorption capacity.Data of adsorption rate could be well fitted by pseudo second order rate model, and adsorption capacity calculated by the model was consistent with actual measurement, particularly when adsorption temperature higher than 318 K was employed.Studies also indicated that the immobilized black wattle tannin had excellent properties of column adsorption kinetics, as well as highly effective availability of adsorption column. Meanwhile, no considerable change of column adsorption property was observed after adsorption desorption cycles, probably due to the fact that adsorption process takes place at the surface of adsorbent.

Key words: collagen fibre, immobilized tannin, adsorption of Cu²⁺, environmental pollution protection