Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Carbohydr Polym. 2013 Jan 30;92(1):269-75. doi: 10.1016/j.carbpol.2012.09.045. Epub 2012 Oct 1.
Cellulose@hydroxyapatite (HA) nanocomposites were prepared in NaOH/thiourea/urea/H(2)O solution via situ hybridization. The composite materials combine the advantage of cellulose and HA with the high specific surface area and the strong affinity toward fluoride. The composite materials were characterized by FTIR, SEM, XRD, TG and XPS, and the adsorption of fluoride was investigated. Adsorption kinetics indicated the adsorption equilibrium of fluoride was within 360 min and the adsorption process was well described by the pseudo-second-order kinetic model. The Langmuir and Freundlich isotherm models could fit the experimental data well. At the initial fluoride concentration of 10mg/L, the residual concentration using above 3g/L adsorbent dose could meet the drinking water standard of WHO norms. Furthermore, the coexisting anions had no significant effect on fluoride adsorption.
纤维素@羟基磷灰石（HA）纳米复合材料是通过原位杂交在 NaOH/硫脲/尿素/H2O 溶液中制备的。该复合材料结合了纤维素和 HA 的优势，具有高比表面积和对氟化物的强亲和力。通过 FTIR、SEM、XRD、TG 和 XPS 对复合材料进行了表征，并研究了氟化物的吸附。吸附动力学表明，氟化物的吸附平衡在 360min 内，吸附过程很好地符合拟二级动力学模型。Langmuir 和 Freundlich 等温模型可以很好地拟合实验数据。在初始氟化物浓度为 10mg/L 的情况下，使用 3g/L 以上的吸附剂剂量，残余氟化物浓度可以达到世界卫生组织标准的饮用水标准。此外，共存的阴离子对氟化物的吸附没有显著影响。
