Absorption of Cr(VI) onto amino-modified titanate nanotubes using   2-Bromoethylamine hydrobromide through S(N)2 reaction

doi:10.1016/j.jcis.2013.03.037

CORC > 北京大学 > 环境科学与工程学院

	Absorption of Cr(VI) onto amino-modified titanate nanotubes using 2-Bromoethylamine hydrobromide through S(N)2 reaction
	Niu, Guanjun ; Liu, Wen ; Wang, Ting ; Ni, Jinren
刊名	胶体与界面科学杂志
	2013
关键词	Titanate nanotubes 2-Bromoethylamine hydrobromide Chromium(VI) Adsorption Reuse HEAVY-METAL IONS AQUEOUS-SOLUTION HEXAVALENT CHROMIUM WASTE-WATER REMOVAL ADSORPTION NANOSTRUCTURES CAPACITY SORPTION PB(II)
DOI	10.1016/j.jcis.2013.03.037
英文摘要	Unlike 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.; Chemistry, Physical; SCI(E); EI; PubMed; 8; ARTICLE; 133-140; 401
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/190523]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Niu, Guanjun,Liu, Wen,Wang, Ting,et al. Absorption of Cr(VI) onto amino-modified titanate nanotubes using 2-Bromoethylamine hydrobromide through S(N)2 reaction[J]. 胶体与界面科学杂志,2013.
APA	Niu, Guanjun,Liu, Wen,Wang, Ting,&Ni, Jinren.(2013).Absorption of Cr(VI) onto amino-modified titanate nanotubes using 2-Bromoethylamine hydrobromide through S(N)2 reaction.胶体与界面科学杂志.
MLA	Niu, Guanjun,et al."Absorption of Cr(VI) onto amino-modified titanate nanotubes using 2-Bromoethylamine hydrobromide through S(N)2 reaction".胶体与界面科学杂志 (2013).