摘要
利用胶原纤维和几种金属盐制备了胶原纤维负载金属离子(MICF)的新型除氟材料,同时对其吸附水溶液中氟离子进行比较实验。结果表明胶原纤维负载锆(Ⅲ)(ZrCF)对氟的吸附性能较好,在4.0～9.0的pH范围内其吸附效应与离子强度基本无关,常见阴离子(Cl-,NO3-,SO24-)的存在对氟的吸附也未显示出干扰效应。通过扫描电子显微镜(SEM)、表面电荷、红外光谱(IR)对ZrCF的形态、性质和吸附机制进行了表征和探讨。SEM观察到金属离子均匀分散在胶原纤维上;用固相分布法测得ZrCF的等电点升高至9.0;结合吸附前后溶液pH变化和IR表征揭示了氟离子在ZrCF上的吸附以配位交换过程为主,吸附中Zr(Ⅳ)金属氧化物表面羟基与氟离子形成配位络合物,释放出H+。
A new type of adsorbent, collagen fiber immobilized metal-ions（MICF） is prepared on the base of some metal-oxide salts and collagen fiber, and its adsorption behavior for removing fluoride in solution is investigated. It is suggested that ZrCF has good adsorption property for fluoride and in the pH range of 4.0-9.0, ion intensity has little effect on adsorption. In addition, the coexisting anions such as Cl- , NO3- and SO4 2- has no interference for adsorption. The ZrCF is described by means of SEM, surface charge and FTIR. It is obviously that Zr（IV） is uniformly impregnated on collagen fiber by means of SEM. The pHpzc increases up to 9. 0 determined by the solid addition method. It is shown that the major adsorption mechanism is coordination exchange using the changes in pH value of solution and FTIR. In the adsorption procedure, the coordination complexation between Zr（IV ）metal hydroxyl groups at the surface of ZrCF and fluoride occurs, and H＋ is discharged.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期124-129,共6页
Journal of Chongqing University
基金
国家杰出青年基金(20325619)
国家自然科学基金(20476062)
关键词
胶原纤维负载金属离子
吸附
除氟
表征
metal ions impregnated on collagen fiber （MICF）
adsorption
fluoride removal
characterization
