Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in   the in vitro gastrointestinal system

doi:10.1016/j.scitotenv.2016.04.204

CORC > 北京大学 > 城市与环境学院

	Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in the in vitro gastrointestinal system
	Li, Wei ; Zhao, Jian ; Zhao, Qing ; Zheng, Hao ; Du, Peng ; Tao, Shu ; Xing, Baoshan
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2016
关键词	Adsorption Solubilization CNTs Passive dosing Gastrointestinal fluid PASSIVE DOSING TECHNIQUE SOLUBILIZATION NANOMATERIALS BINDING
DOI	10.1016/j.scitotenv.2016.04.204
英文摘要	Adsorption and bioaccessibility of phenanthrene on graphite and multiwalled carbon nanotubes (CNTs) were investigated in simulated gastrointestinal fluid using a passive dosing system. The saturated adsorption capacity of phenanthrene on different adsorbents follows an order of hydroxylated CNTs (H-CNTs) > carboxylated CNTs (C-CNTs) > graphitized CNTs (G-CNTs) > graphite, consistent with the order of their surface area and micropore volume. The change of phenanthrene adsorption on the adsorbents is different with the presence of pepsin (800 mg/L) and bile salts (500 mg/L and 5000 mg/L, abbreviated as BS500 and BS5000). Both solubilization of phenanthrene by pepsin and bile salts and their competition with phenanthrene for the adsorption sites play a role. In addition, the large increase of the maximum adsorption capacity in BS5000 solution indicates an enhanced dispersion of CNTs or an exfoliation of graphite by bile salts, which consequently increases the exposed surface area. The bioaccessibility increases in pepsin and BS500 solution with a growing free phenanthrene concentration. Although the bioaccessibility of phenanthrene stalls or slightly decreases in the middle range of free phenanthrene concentration in BS5000 solution, the bioaccessibility overall is much higher than that in pepsin and BS500 solution at the same phenanthrene level. It is impossible to separate the effect of competition from dispersion (or exfoliation) at this stage, but the relative contribution of solubilization to phenanthrene desorption in pepsin and BS500 solutions was quantified, which improves our understanding of the mechanisms on bioaccessibility of adsorbed pollutants on CNTs. (C) 2016 Elsevier B.V. All rights reserved.; China Scholarship Council; National Natural Science Foundation of China [41573092]; Hundreds Talents Program of Chinese Academy of Sciences awarded for Qing Zhao; Chinese Research Academy of Environmental Sciences; USDA-NIFA Hatch program [MAS 00475]; Chinese Research Academy of Environmental Sciences [SKLECRA2015OFP10]; SCI(E); EI; PubMed; ARTICLE; zhaojian047@126.com; bx@umass.edu; 50-56; 566
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/433625]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Li, Wei,Zhao, Jian,Zhao, Qing,et al. Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in the in vitro gastrointestinal system[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016.
APA	Li, Wei.,Zhao, Jian.,Zhao, Qing.,Zheng, Hao.,Du, Peng.,...&Xing, Baoshan.(2016).Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in the in vitro gastrointestinal system.SCIENCE OF THE TOTAL ENVIRONMENT.
MLA	Li, Wei,et al."Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in the in vitro gastrointestinal system".SCIENCE OF THE TOTAL ENVIRONMENT (2016).