Degree of time dependency of kinetic coefficient as a function of adsorbate concentration; new insights from adsorption of tetracycline onto monodispersed starch-stabilized magnetic nanocomposite

doi:10.1016/j.jenvman.2018.04.060

	Degree of time dependency of kinetic coefficient as a function of adsorbate concentration; new insights from adsorption of tetracycline onto monodispersed starch-stabilized magnetic nanocomposite
	Okoli, Chukwunonso P.1,2; Ofomaja, Augustine E.1
刊名	JOURNAL OF ENVIRONMENTAL MANAGEMENT
	2018-07-15
卷号	218 页码:139-147
关键词	Fractal-like kinetics Degree of time dependency Adsorption mechanism Monodispersed starch-stabilized magnetite Tetracycline antibiotics
ISSN号	0301-4797
DOI	10.1016/j.jenvman.2018.04.060
通讯作者	Okoli, Chukwunonso P.(nonsokoli@yahoo.com)
英文摘要	The realization that the observed kinetic coefficient (k(obs)) varies with time in most real-time adsorption system, as against the constant value conceived in the most widely-applied adsorption kinetic models, have attracted much attention in recent time. Understanding the factors that control the extent/degree of time dependency (otherwise known as fractal-like kinetics), is therefore central in taking manipulative advantage of this phenomenon in critical adsorption applications. This study therefore deployed nonfractal-like and fractal-like kinetic approach to study the adsorption of tetracycline on monodispersed starch-stabilized magnetite nanocomposite (MSM). MSM was synthesized by in-situ coprecipitation of magnetite in the presence of starch, and successfully characterized with classical solid-state techniques. Isotherm studies indicated that MSM has heterogenous surface adsorption sites. Equilibrium and kinetic data indicated the existence of pi-cation interaction as the underlying mechanism, while pH study revealed that tetracycline was adsorbed in its zwitterion form. Though the non-fractal kinetic models exhibited some level of relevance in explaining the tetracycline adsorption interactions, the best fitting of the fractal-like pseudo second order model to the adsorption kinetic data, indicated that the real-time adsorption kinetics occurred in fractal-like manner. The study also revealed that the degree of time dependency of k(obs) had negative correlation with the initial tetracycline concentration. Apart from developing a low-cost strategy for addressing tetracycline water pollution, the result of this study serves a positive step towards gaining manipulative control of adsorption mechanism in potential application of MSM for targeted drug delivery and controlled release of tetracycline antibiotics. (C) 2018 Elsevier Ltd. All rights reserved.
WOS关键词	FRACTAL-LIKE KINETICS ; BROUERS-SOTOLONGO ; THERMODYNAMIC PARAMETERS ; AQUEOUS-SOLUTION ; NANOPARTICLES ; ADSORBENTS ; SORPTION ; REMOVAL ; CYCLODEXTRIN ; ANTIBIOTICS
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
WOS记录号	WOS:000433649800014
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/54900]
专题	中国科学院地理科学与资源研究所
通讯作者	Okoli, Chukwunonso P.
作者单位	1.Vaal Univ Technol, Dept Chem, P Bag X021, ZA-1900 Vanderbiljpark, South Africa 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Okoli, Chukwunonso P.,Ofomaja, Augustine E.. Degree of time dependency of kinetic coefficient as a function of adsorbate concentration; new insights from adsorption of tetracycline onto monodispersed starch-stabilized magnetic nanocomposite[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2018,218:139-147.
APA	Okoli, Chukwunonso P.,&Ofomaja, Augustine E..(2018).Degree of time dependency of kinetic coefficient as a function of adsorbate concentration; new insights from adsorption of tetracycline onto monodispersed starch-stabilized magnetic nanocomposite.JOURNAL OF ENVIRONMENTAL MANAGEMENT,218,139-147.
MLA	Okoli, Chukwunonso P.,et al."Degree of time dependency of kinetic coefficient as a function of adsorbate concentration; new insights from adsorption of tetracycline onto monodispersed starch-stabilized magnetic nanocomposite".JOURNAL OF ENVIRONMENTAL MANAGEMENT 218(2018):139-147.