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. 2020 Feb 1;17(3):914.
doi: 10.3390/ijerph17030914.

Adsorption Characteristics of Oxytetracycline by Different Fractions of the Organic Matter from Humus Soil: Insight from Internal Structure and Composition

Mengya Luo  1 , Shengke Yang  1 , Siqi Shen  1 , Yu Li  1
Affiliations

Adsorption Characteristics of Oxytetracycline by Different Fractions of the Organic Matter from Humus Soil: Insight from Internal Structure and Composition

Mengya Luo et al. Int J Environ Res Public Health. .

Abstract

For minimizing the transport of antibiotics to groundwater, the migration of antibiotics in soils should be investigated. Soil organic matter can affect the migration of antibiotics. To date, the influence of aromatics and aliphatic content of organic matter on the adsorption of antibiotics has been controversial. To better understand the reaction mechanism of soil organic matter with antibiotics, this study investigated the adsorption of oxytetracycline (OTC) by humus soils (HOS) and their fractions. HOS were sequentially fractionated into four organic fractions, including the removal of dissolved organic matter (HRDOM), removal of minerals (HRM), removal of free fat (HRLF), and nonhydrolyzable organic carbon (HNHC). Moreover, batch experiments revealed that adsorption capacity was ordered by HNHC > HOS > HRDOM > HRLF > HRM. SEM images and N2 adsorption/desorption isotherms indicate that adsorption capacity is independent of the external structure. However, adsorption capacity is related to the internal structure and composition. Combination analysis with elemental composition and infrared spectroscopy showed that the adsorption capacity of HRM, HRLF, and HNHC had a good positive correlation with aromaticity, but a negative correlation with polarity and hydrophilicity. Additionally, the rule of binding affinity between OTC and functional groups with different properties was summarized as aromatic > polarity > hydrophilic.

Keywords: Humus; adsorption; organic matter fractions; oxytetracycline.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Extraction treatment of the organic matter of humus soil.
Figure 2
Figure 2
Adsorption characteristics of OTC by different fractions.
Figure 3
Figure 3
The fitted adsorption isotherms of OTC by different fractions: (a) Langmuir model; (b) Freundlich model.
Figure 4
Figure 4
The effect of pH on the adsorption of OTC by different fractions.
Figure 5
Figure 5
Effects of different DOM types on the adsorption of OTC in humus (HR) and sediment (SR) soil.
Figure 6
Figure 6
The 3D fluorescence spectra of DOM: (a) humus soil; (b) sedimentary soil.
Figure 7
Figure 7
The micro-structure of: (a) HOS; (b) HRDOM; (c) HRM; (d) HRLF; (e) HNHC.
Figure 8
Figure 8
N2 adsorption-desorption isotherms of different fractions.
Figure 9
Figure 9
Site energy distribution based on adsorption isothermal model.
Figure 10
Figure 10
The infrared spectra of different fractions: (a) before adsorption; (b) after adsorption.
Figure 11
Figure 11
Relationship between adsorption coefficient Kd of HRM, HRLF and HNHC and H/C, (N+O)/C, O/C.
Figure 12
Figure 12
The affinity of functional groups combined with OTC.
See this image and copyright information in PMC

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