Abstract：
In this article, the multifunctional behavior of novel, efficient, and cost-effective humic acid-coated nanoceria (HA@CeO2 NPs) was utilized for the sorptive removal of U(VI), Cr(VI), and F- ions at different conditions. The production cost of HA@CeO2 was $19.28/kg and was well characterized by DLS, FESEM, HRTEM, FTIR, XRD, XPS, and TGA. Batch adsorption study for U(VI) (at pH ~ 8), Cr(VI) (at pH ~ 1), and F- (at pH ~ 2) revealed that the maximum percentage of sorption was > 80% for all the cases. From the contact time experiment, it was concluded that pseudo-second-order kinetics followed, and hence, the process should be a chemisorption. The adsorption study revealed that U(VI) and Cr(VI) followed the Freundlich isotherm, whereas F- followed the Langmuir isotherm. Maximum adsorption capacity for F- was 96 mg g-1. Experiments in real water suggest that adsorption is decreased in Kaljani River water (~ 12% for Cr(VI) and ~ 11% for F-) and Kochbihar Lake water (25.04% for Cr(VI) and 20.5% for F-) because of competing ion effect. Mechanism was well established by the kinetic study as well as XPS analysis. Because of high adsorption efficiency, HA@CeO2 NPs can be used for the removal of other harmful water contaminants to make healthy aquatic life as well as purified drinking water.
摘要：
在这篇文章中,小说的多功能行为，高效,和具有成本效益的腐殖酸包覆的纳米二氧化铈（HA@CeO2NPs）用于吸附去除U（VI），Cr(VI),和F-离子在不同的条件下。HA@CeO2的生产成本为19.28美元/公斤，并具有良好的DLS特性，FESEM，HRTEM,FTIR,XRD,XPS,和TGA。对U（VI）（pH〜8）的批量吸附研究，Cr(VI)(pH~1),和F-（在pH〜2）表明，所有情况下的最大吸附百分比均>80％。从接触时间实验来看，结论是伪二级动力学随之而来，因此，这个过程应该是化学吸附。吸附研究表明，U（VI）和Cr（VI）遵循Freundlich等温线，而F-遵循朗缪尔等温线。对F-的最大吸附容量为96mgg-1。在实际水中的实验表明，由于竞争离子效应，卡尔贾尼河水（Cr（VI）为〜12％，F-为〜11％）和科赫比哈尔湖水（Cr（VI）为25.04％，F-为20.5％）的吸附降低。通过动力学研究和XPS分析很好地建立了机理。由于吸附效率高，HA@CeO2NPs可用于去除其他有害的水污染物，使健康的水生生物以及净化的饮用水。
