胶原纤维负载铈(CeCF)吸附水体中氟的研究

Adsorption of Fluoride from Aqueous Solution by Cerium(III)Loaded Collagen Fiber

将稀土铈（Ⅲ）负载于胶原纤维上制备新型除氟吸附材料CeCF。研究表明：CeCF对F^-的吸附容量为5．88mmol．g^-1；且铈与胶原纤维结合牢固，不易脱落。pH值对吸附有较大影响，适宜的pH范围为2～3.其吸附等温线符合Langmuir方程；吸附动力学可用拟二级速率方程描述。除PO4^3-外，溶液中的SO4^2-、NO^3-、Cl^-、CO3^2-基本不影响CeCF对氟的吸附；用pH〉12的碱溶液可使吸附剂再生。固定床吸附实验表明，当F^-质量浓度为20mg．L^-1流速为0．7332cm^3·min^-1时，吸附穿透点为447个床层体积。

A new adsorbent, Cerium（Ⅲ loaded collagen fiber（CeCF）, was prepared. Experimental results indicated that the adsorption capacity of CeCF to F^- was 5.88 mmol·g^-1, and Cerium （Ⅲ） was nearly not leaked during adsorption process. The pH of solution significantly affects the adsorption, and the appropriate adsorption capacity was achieved in the pH range of 2-3. The adsorption isotherms can be described by the Langmuir equation, while the adsorption kinetics can-be well fitted by the pseudo-second-order rate model. The anions of SO4^2- , NO3^-, Cl^-, CO3^2-have no effect on the adsorption of fluoride except PO4^3-. The adsorbent can be regenerated by alkali solution when pH≥12. Column adsorption experiments indicated that breakthrough point was around 447 bed volume when feeding concentration of fluoride was 20 mg·L^-1 and flow rate was 0. 7332 cm^3· min^-1.