稀土铈改性壳聚糖微球对氟离子的吸附

摘要

采用稀土铈对壳聚糖进行改性成球，经戊二醛交联后制得新型除氟吸附材料稀土铈改性壳聚糖微球（ CeCh）。通过SEM、FT－IR、XRD和TG等对CeCh进行表征，采用间歇吸附试验方法研究了CeCh最佳载铈量为1 g Ce（ NO3）3·6H2 O／g壳聚糖，CeCh吸附氟离子的最佳吸附条件为：吸附时间8 h、温度30℃、溶液的pH值为7。 CeCh对氟离子的吸附符合Lagergren准一级动力学模型。比较了壳聚糖和稀土铈改性壳聚糖微球除氟效率，结果表明CeCh在吸附平衡时吸附量为0�268 mg／g，是壳聚糖未改性前的6�06倍，可见改性后的CeCh可以显著提高氟离子的吸附效果，可用于对水中氟离子进行脱氟处理。%Chitosan was modified into microspheres by the rare-earth metal cerium ions, and then cross-linked by glutaraldehyde to prepare a new fluoride removal adsorbent material named rare-earth cerium modified chitosan microspheres ( CeCh ) , which was characterized by SEM, FI-IR, XRD and TG. The influence of cerium content in modified chitosan microspheres, adsorption time, temperature and pH on fluoride removal rate were studied by batch adsorption experiments. The results showed that the best cerium content was 1 g Ce( NO3 ) 3 ·6H2 O/g chitosan, and the best adsorption condition were 8 h, 30 ℃and pH7. 0. 268 mg/g, which was 6. 06 times before the modification of chitosan. The equilibrium adsorption data were fitted into Lagergren pseudo-first order kinetic model. Compared with the fluoride removal rate of chitosan and CeCh, the results showed that the defluoridation capacity of CeCh was 14.4 times of chitosan. Rare-earth cerium modified chitosan microspheres have a very significant effect on the adsorption of fluoride ions in water, which can be used to remove fluoride in water treatment.