胶原纤维负载锆对氟离子和磷酸根的吸附去除

Adsorption of fluoride and phosphate by Zr(Ⅳ) impregnated collagen fiber

摘要:

将Zr(Ⅳ) 负载在胶原纤维基质上制备吸附材料，研究了该吸附材料对水溶液中氟离子和磷酸根离子的吸附特性。结果表明，胶原纤维负载Zr(Ⅳ) (ZrCF) 对氟离子和磷酸根离子均具有较强的吸附能力，在pH 4~9范围内，胶原纤维负载Zr(Ⅳ) 对氟离子保持较高的吸附容量；ZrCF吸附磷酸根的适宜pH值范围为3.0~6.0。胶原纤维负载Zr(Ⅳ) 对氟离子和磷酸根离子的吸附等温线均符合Langmuir方程；吸附动力学研究表明胶原纤维负载Zr(Ⅳ) 对氟离子和磷酸根离子的吸附动力学可以用准二级速度方程来描述。水中常见的Cl-，NO3-，CO32-和SO42-对ZrCF吸附氟离子和磷酸根离子的影响不大，模拟地下水体系的动态实验结果表明ZrCF对磷酸根的亲和力更强。

Abstract:

A new type adsorbent was prepared by impregnating Zr(Ⅳ) on collagen fiber (ZrCF) and its adsorption performance to remove fluoride and phosphate in aqueous solution was investigated. It was illustrated that ZrCF had a excellent ability of adsorbing both fluoride and phosphate. In the range of pH 4~9, ZrCF maintained a higher adsorption capacity for fluoride, and the maximum adsorption of phosphate was obtained in pH 3.0~6.0. The Langmuir equation could fit the adsorption isotherm of fluoride and phosphate well, and the datum of adsorption rate could be well described by the pseudo-second-order rate model. The coexisting anions such as Cl-, NO3-, CO32- and SO42- had little effect on adsorption of fluoride and phosphate. Column adsorption experiment indicated that ZrCF had more strong affinity to phosphate.