应用化学2017，Vol.34Issue(10)：1177-1185,9.DOI:10.11944/j.issn.1000-0518.2017.10.170149
二氧化钍纳米球在碳酸铀酰铵溶液中对铀的吸附性能
Adsorption Performance of Thorium Dioxide Nanospheres Towards Uranium in the Aqueous Solution of Ammonium Uranyl Tricarbonate
摘要
Abstract
Thorium dioxide(ThO2 ),a kind of actinide metal oxides,has good performance as adsorbent,but it is necessary to extend their application scope. In the present work,we investigated the adsorption property of ThO2 nanospheres prepared by hydrothermal method in the aqueous solution of ammonium uranyl tricarbonate. In the presence of 2 mmol/L NH4HCO3 and 20 mmol/L tris(hydroxymethyl)aminomethane)-HCl,ThO2 nanospheres had an adsorption capacity of 6. 52 mg/g when the initial concentration of uranium was 20 mg/L,which followed pseudo-second-order kinetic model well. In isothermal adsorption studies, Freundlich model was preferable. The desorption of ThO2 nanospheres after adsorption was achieved easily by using dilute HCl solution. In the mechanism research,it was found that ThO2 nanospheres have negative charges under the experiment conditions and adsorb UO2+2 via cation adsorption mechanism. However,the uranium uptake was seriously affected by other cations,such as Ca2+,Cu2+ and Ni2+. This work will contribute to the recovery of uranium from seawater and alkaline/neutral radioactive waste by metal oxides.关键词
ThO2/铀/吸附/碳酸铀酰铵Key words
thorium dioxide/uranium/adsorption/ammonium uranyl tricarbonate分类
化学化工引用本文复制引用
刘小冬,陈庆德,沈兴海..二氧化钍纳米球在碳酸铀酰铵溶液中对铀的吸附性能[J].应用化学,2017,34(10):1177-1185,9.基金项目
科学挑战计划(TZ2016004)和国家自然科学基金(U1507203和91226112)资助 Supported by Science Challenge Project(No. TZ2016004),the National Natural Science Foundation of China(No. U1507203,No. 91226112) （TZ2016004）
