TitleAbsorption of Cr(VI) onto amino-modified titanate nanotubes using 2-Bromoethylamine hydrobromide through S(N)2 reaction
AuthorsNiu, Guanjun
Liu, Wen
Wang, Ting
Ni, Jinren
AffiliationPeking Univ, Shenzhen Grad Sch, Sch Environm & Energy, Shenzhen Key Lab Heavy Met Pollut Control & Reuti, Shenzhen 518055, Peoples R China.
Peking Univ, Key Lab Water & Sediment Sci, Minist Educ, Dept Environm Engn, Beijing 100871, Peoples R China.
Peking Univ, Yingjie Exchange Ctr, Room 417, Beijing 100871, Peoples R China.
KeywordsTitanate nanotubes
2-Bromoethylamine hydrobromide
Chromium(VI)
Adsorption
Reuse
HEAVY-METAL IONS
AQUEOUS-SOLUTION
HEXAVALENT CHROMIUM
WASTE-WATER
REMOVAL
ADSORPTION
NANOSTRUCTURES
CAPACITY
SORPTION
PB(II)
Issue Date2013
Publisher胶体与界面科学杂志
CitationJOURNAL OF COLLOID AND INTERFACE SCIENCE.2013,401,133-140.
AbstractUnlike the complex reaction of grafting amino groups using harmful organic solvents, we proposed an environmental friendly method for effective amino grafting on titanate nanotubes (TNTs) with 2-Bromoethylamine hydrobromide (2-Bh) through a two-step S(N)2 reaction in pure water solution. The amino-modified titanate nanotubes (TNTs-RNH2) were characterized by Transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Under optimal conditions, the molar ratio of NaOH/2-Bh was 1.2 for step 1 and 1.3 for step 2 with corresponding reaction time of 12 h and 24 h, respectively. The adsorption isotherm of Cr(VI) onto TNTs-RNH2 well fits Langmuir model with maximal adsorption capacity of 69.1 mg/g, which is almost five times larger than that of fresh TNTs. The slight decrease in adsorption capacity with NO3- concentration was attributed to competition from ions, suppression of electric double layer and changes of Cr(VI) speciation. The wide adsorption pH range was due to much larger point of zero charge (8.2) and electrostatic attraction between positively charged TNTs-RNH2 and Cr(VI) with different speciations. The products could be well reused due to simple desorption at pH 10 with about 20% loss of the adsorption capacity after three recycles without any regeneration treatment. (c) 2013 Elsevier Inc. All rights reserved.
URIhttp://hdl.handle.net/20.500.11897/190523
ISSN0021-9797
DOI10.1016/j.jcis.2013.03.037
IndexedSCI(E)
EI
PubMed
Appears in Collections:环境科学与工程学院
环境与能源学院
环境模拟与污染控制国家重点联合实验室
水沙科学教育部重点实验室(联合)

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