title: Enhancing adsorption of U(VI) onto EDTA modified L. cylindrica using epichlorohydrin and ethylenediamine as a bridge.
abstract: Benefiting from strong coordination ability and unique vascular structure, EDTA modified L. cylindrica opens up an alternative way for uranium recovery from seawater. However, limitations, such as poor adsorption capacity and slow adsorption rate due to low graft ratio of EDTA via one-step esterification block its practical application. Here, a strategy for increasing the graft ratio is proposed in order to improve the adsorption performance. The strategy initially involves immobilization of epichlorohydrin (EPI) onto L. cylindrica and then ethylenediamine (EDA) is introduced via facile ring-opening reaction. EPI and EDA serve as a bridge between L. cylindrica and EDTA. The graft ratio is promoted (15.01 to 21.44%) contributing to the smaller steric hindrance of EPI and EDA than EDTA and improvement in adsorption performance. In addition, the adsorbent prepared by the new strategy exhibits excellent adsorption properties in simulated seawater.
authors.affiliation: Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, P. R. China.
authors.forename: Shouzheng
authors.initials: S
authors.lastname: Su
authors.affiliation: Institute of Advanced Marine Materials, Harbin Engineering University, 150001, P. R. China.|Harbin Shipbuilding Engineering Design &Research Academy, Harbin, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, P. R. China.
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Liu
authors.affiliation: Modern Analysis, Test and Research Center, Heilongjiang University of Science and Technology, Harbin 150027, P. R. China.
authors.forename: Hongsen
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, P. R. China.
authors.forename: Rumin
authors.initials: R
authors.lastname: Li
authors.affiliation: Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, P. R. China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Jing
authors.affiliation: Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, P. R. China.|Institute of Advanced Marine Materials, Harbin Engineering University, 150001, P. R. China.|Harbin Shipbuilding Engineering Design &Research Academy, Harbin, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D004492:Edetic Acid / Q000737:chemistry*; D004811:Epichlorohydrin / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D029776:Luffa / Q000737:chemistry*; D012623:Seawater / Q000737:chemistry*; D014501:Uranium / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D005029:Ethylenediamines; D004811:Epichlorohydrin; D014501:Uranium; C031234:ethylenediamine; D004492:Edetic Acid