Adsorption of chlorophenoxy pesticides on activated carbon with gradually removed external particle layers

被引:69
作者
Derylo-Marczewska, Anna [1 ]
Blachnio, Magdalena [1 ]
Marczewski, Adam W. [1 ]
Swiatkowski, Andrzej [2 ]
Buczek, Bronislaw [3 ]
机构
[1] M Curie Sklodowska Univ, PL-20031 Lublin, Poland
[2] Mil Univ Technol, PL-00908 Warsaw, Poland
[3] AGH Univ Sci & Technol, PL-30059 Krakow, Poland
关键词
Pesticide adsorption; Chlorophenoxy acid; Activated carbon; Adsorption equilibrium; Adsorption kinetics; AQUEOUS-SOLUTION; 2,4-DICHLOROPHENOXYACETIC ACID; DILUTE-SOLUTIONS; POROUS STRUCTURE; KINETICS; WATER; DEGRADATION; HERBICIDES; SURFACE; SELECTION;
D O I
10.1016/j.cej.2016.09.082
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In the work the role of porous structure of carbon adsorbent is considered taking into account adsorption equilibrium and kinetics of selected chlorophenoxy herbicides. In the study three fractions of activated carbon obtained in the process of gradual removing the external granule layers by abrasion (33 and 66%wt) are used. Porosity of the obtained samples was characterized by low-temperature nitrogen adsorption. The adsorption isotherms of 4-chlorophenoxyacetic acid and 2-(4-chlorophenoxy)-2-methyl propionic acid from aqueous solutions were measured by using a static method. The kinetics of adsorption process was studied by applying UV-vis spectrophotometer with a flow cell. The concentration vs. time and the adsorption vs. time profiles were calculated from the obtained spectra. The adsorption data were analyzed to discuss the influence of carbon properties and adsorbate properties on adsorption effectiveness and rate. Effect of carbon pore structure on adsorption rate was observed. The usefulness of various kinetic models and equations for analysis of the experimental data was studied. In terms of fitting quality and lack of systematic deviations the semi-empirical multi-exponential (m-exp) equation was found to be the best with the fractal-like mixed order equation (f-MOE) and McKay's pore diffusion models (PDMs) as second-best alternatives with approximately doubled deviations and some systematic deviations. All other models and equations investigated including second order kinetics (PSOE) and intraparticle diffusion model (IDM) showed much higher deviations of systematic character. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:408 / 418
页数:11
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