Chen Congcong, Liu Xuan, Tian Xiaoyu, Feng Jiaqi, Liu Yujia, Song Mingjun, Zhu Wenkun, Zhang Yong
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China.
The 210(th) Institute of the Sixth Academy of CASIC, Xian 710065, China.
Sci Total Environ. 2024 Jun 1;927:172342. doi: 10.1016/j.scitotenv.2024.172342. Epub 2024 Apr 10.
A novel polyethyleneimine/polydopamine-functionalized β-cyclodextrin supported fly ash adsorbent (PEI/PDA/β-CD/FA) had been synthesized to uptake uranium from polluted water. At pH = 5.0 and T = 298 K, the uranium uptake efficiency and capacity of PEI/PDA/β-CD/FA reached to 98.7 % and 622.8 mg/g, respectively, which were much higher than those of FA (71.4 % and 206.7 mg/g).The excellent uranium uptake properties of PEI/PDA/β-CD/FA could be explained by three points: (1) using β-CD as a supporting material could effectively avoid the aggregation of FA and improve the hydrophily of FA; (2) the unique cavity structure of β-CD could form chelates with uranyl ions; (3) the formation of PEI/PDA co-deposition coating on FA further enhanced the affinity of FA to UO. With the presence of interfering ions, the uptake efficiency of PEI/PDA/β-CD/FA for uranium was still up to 94.5 % after five cycles, indicating the high selectively and recoverability of PEI/PDA/β-CD/FA. In terms of the results of characterizations, uranium was captured by PEI/PDA/β-CD/FA via electrostatic attraction, hydrogen bond, coordination and complexation. To sum up, PEI/PDA/β-CD/FA was expected to be used for actual sewage treatment owing to its excellent uranium uptake efficiency/capacity, selectivity, cycle stability and feasibility of actual application.
一种新型的聚乙烯亚胺/聚多巴胺功能化β-环糊精负载粉煤灰吸附剂（PEI/PDA/β-CD/FA）已被合成用于从污染水中摄取铀。在pH = 5.0和T = 298 K条件下，PEI/PDA/β-CD/FA对铀的摄取效率和容量分别达到98.7%和622.8 mg/g，远高于粉煤灰（71.4%和206.7 mg/g）。PEI/PDA/β-CD/FA优异的铀摄取性能可从三点来解释：（1）使用β-环糊精作为载体材料可有效避免粉煤灰的团聚并提高其亲水性；（2）β-环糊精独特的空腔结构可与铀酰离子形成螯合物；（3）在粉煤灰上形成的PEI/PDA共沉积涂层进一步增强了粉煤灰对UO的亲和力。在存在干扰离子的情况下，经过五个循环后，PEI/PDA/β-CD/FA对铀的摄取效率仍高达94.5%，表明其具有高选择性和可回收性。从表征结果来看，铀通过静电吸引、氢键、配位和络合作用被PEI/PDA/β-CD/FA捕获。综上所述，由于PEI/PDA/β-CD/FA具有优异的铀摄取效率/容量、选择性、循环稳定性和实际应用可行性，有望用于实际污水处理。
