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将锆(Ⅳ)固化在通过乙醛酸改性的粒状废弃皮革上制备出新型氟离子吸附剂.采用SEM-EDX、XPS、FTIR等方法表征了其表面形貌及结构,研究了该吸附剂对溶液中氟离子(F-)的吸附特性并探索其吸附机理。结果表明:粒状废弃皮革与锆的最佳质量比为1∶2;对F-的吸附最佳p H=3;当p H为3,温度为25℃、F-的初始浓度为50 mg/L、吸附剂用量为0.5 g/L时,对F-的吸附量为49.72 mg/g,当吸附剂用量增加到3 g/L时,F-的去除率可达96%;该吸附剂对F-的吸附等温线符合Langmuir方程,吸附动力学可用准二级动力学模型描述,属化学吸附,F-以离子交换的形式代替-OH与吸附剂中的锆(Zr(Ⅳ))结合形成稳定的化学键,从而达到吸附水溶液中氟离子的目的。
The new type of fluoride ion adsorbent was prepared by solidifying zirconium (Ⅳ) onto granular waste leather modified by glyoxylic acid.The surface morphology and structure of the adsorbent were characterized by SEM-EDX, XPS and FTIR. Adsorption characteristics of fluoride ion (F-) in solution and explore its adsorption mechanism. The results showed that the optimum mass ratio of granular waste leather to zirconium was 1: 2, the optimum adsorption of F- was p H = 3, and the initial concentration of F- was 50 mg / L, the adsorption capacity of F- was 49.72 mg / g when the amount of adsorbent was 0.5 g / L, and the removal rate of F- was 96% when the amount of adsorbent was increased to 3 g / L. The adsorption isotherm of F- conforms to the Langmuir equation. The kinetics of adsorption can be described by quasi-second-order kinetic model. It belongs to chemical adsorption. F-ion exchange forms -OH instead of zirconium (Zr (Ⅳ)) in the adsorbent Stable chemical bonds, so as to achieve the purpose of adsorption of fluoride ions in aqueous solution.