Abstract：
A novel adsorbent for fluoride ions (F-) removal was prepared from cerium ion cross-linked carboxymethyl cellulose (CMC) biopolymer beads loaded with CeO2 nanoparticles (NPs). The characterization of the beads was performed by swelling experiments, scanning electron microscopy and Fourier transforms infrared spectroscopy. The adsorption of fluoride ions from aqueous solutions was carried out with both cerium ion cross-linked CMC beads (CMCCe) and CeO2-NPs added beads (CeO2-CMC-Ce) in a batch system. Optimized adsorption conditions were obtained by testing the parameters such as pH, contact time, adsorbent dose, and shaking rate at 25 °C. The adsorption process is well described by the Langmuir isotherm and pseudo-second-order kinetics. The maximum adsorption capacity was found as 105 and 312 mg/g F- for CMC-Ce and CeO2-CMC-Ce beads, respectively. Reusability studies showed that, the adsorbent beads have exhibited excellent sustainable properties up to 9 cycle usage. This study suggests that, CMC-Ce composite with CeO2 nanoparticles is a very effective adsorbent in removing fluoride from water.
摘要：
从负载有CeO2纳米颗粒（NP）的铈离子交联羧甲基纤维素（CMC）生物聚合物珠制备了一种新型的氟离子（F-）去除吸附剂。通过溶胀实验对珠子进行表征，扫描电子显微镜和傅里叶变换红外光谱。在间歇系统中，使用铈离子交联的CMC珠（CMCCe）和添加CeO2-NP的珠（CeO2-CMC-Ce）进行水溶液中氟离子的吸附。通过测试pH、接触时间,吸附剂剂量，和在25°C下的摇动速率。吸附过程由Langmuir等温线和伪二级动力学很好地描述。CMC-Ce和CeO2-CMC-Ce珠的最大吸附容量为105和312mg/gF-，分别。可重用性研究表明,吸附剂珠表现出优异的可持续性能高达9个周期的使用。这项研究表明,CMC-Ce与CeO2纳米颗粒的复合材料是一种非常有效的去除水中氟化物的吸附剂。
