TitleAdsorption of U(VI) by multilayer titanate nanotubes: Effects of inorganic cations, carbonate and natural organic matter
AuthorsLiu, Wen
Zhao, Xiao
Wang, Ting
Zhao, Dongye
Ni, Jinren
AffiliationAuburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA.
Peking Univ, Dept Environm Engn, Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China.
Taiyuan Univ Sci & Technol, Ctr Environm Sci, Taiyuan 030026, Shanxi, Peoples R China.
KeywordsTitanate nanotube
Uranium
Radionuclide
Radioactive chemical
Ion exchange
AQUEOUS-SOLUTIONS
SIMULTANEOUS REMOVAL
HUMIC-ACID
URANIUM(VI) SORPTION
HYDROTHERMAL METHOD
HIGHLY EFFICIENT
IONIC-STRENGTH
REDUCTION
WATER
IRON
Issue Date2016
PublisherCHEMICAL ENGINEERING JOURNAL
CitationCHEMICAL ENGINEERING JOURNAL.2016,286,427-435.
AbstractTitanate nanotubes (TNTs) were synthesized through a hydrothermal method and tested to remove U(VI) from water. TEM characterizations indicate that the multilayer nanotubes have an inner and outer diameter of 4.5 and 9 nm, respectively. The material exhibited excellent adsorption capacity (Langmuir = 333 mg g(-1)) for U(VI) and rapid adsorption kinetics. XRD, XPS and Raman analyses of TNTs before and after U(VI) uptake revealed that the high capacity is attributed to the abundant -ONa functional groups located in the interlayers of TNTs and ion exchange between Na+ and cationic uranyl species is the key mechanism. The chemical formula of TNTs was determined to be Na0.92H1.08Ti3O7.1.18H(2)O, which turns to (UO2)(0.58)(OH)(0.70)Na0.16H1.38Ti3O7.1.18H(2)O upon U(VI) adsorption. The optimal pH for U(VI) ranges from 4 to 6. The presence of Ca2+ and CO32- at elevated concentrations may inhibit U(VI) due to competitive adsorption and formation of anionic and electro-neutral complexes. However, humic acid (HA) promoted U(VI) adsorption because adsorbed HA facilitated binding with U(VI). Moreover, HA can greatly alleviate the competitive effects of Ca2+ and carbonate on adsorption. Spent TNTs can be efficiently regenerated through a sequential acid-base treatment process using dilute HNO3 and NaOH solution. TNTs appear promising for removal and recovery of U(VI). (C) 2015 Elsevier B.V. All rights reserved.
URIhttp://hdl.handle.net/20.500.11897/422584
ISSN1385-8947
DOI10.1016/j.cej.2015.10.094
IndexedSCI(E)
EI
Appears in Collections:环境科学与工程学院
水沙科学教育部重点实验室(联合)

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