Abstract
The performance of oxytetracycline adsorption by untreated reed roots, stems and leaves, as well as the desugared reed roots, stems and leaves, was investigated with scanning electron microscopy, Fourier-transform infrared spectroscopy, elemental analysis and surface area analysis to understand the adsorption mechanism. The results showed that the adsorption capacities of untreated reed were 416.35 mg/kg for roots, 341.92 mg/kg for stems and 280.21 mg/kg for leaves, and can be increased significantly by a factor of 8–12 after desugarization. The pseudo-first-order kinetic model was more suitable for describing the adsorption kinetics of reed residues, and the isothermal adsorption process was fitted well by both the Langmuir and Freundlich models. The thermodynamic process suggested that the adsorption was a spontaneous endothermic reaction, and mainly physical adsorption-dominated. The desugared reed tissues had a larger surface area and smaller pore area, and the aromaticity of reed residues increased; on the other hand, the polarity and hydrophilicity decreased after desugarization, thus revealing the mechanism of enhanced OTC(oxytetracycline) adsorption by desugared reed residues. This study suggests that the reed residues contribute the complex adsorption ability for both inorganic and organic contaminates. Corruption of the reed can enhance the adsorption; thus, protecting the natural reed residue and letting it naturally corrupt, rather than artificially cleaning it up, can effectively promote the adsorption of pollutants in the environment and protect environmental and public health.
Highlights
Antibiotics are widely existing in the environment and have aroused a lot of concern about their numerous dosages, toxicity, and disturbance to the ecosystem’s function [1,2,3]
The adsorption of untreated reed residue was mostly et completed within 12 h, and tended topseudo-second-order equilibrium within 24 h, while the The adsorption process where
Results showed of desugared reed residue was mostly completed within h and reached equilibrium within that all the samples agreed with both the pseudo-first-order and pseudo-second-order kinetic models, Thethe desugarization of reed can greatly improve the model
Summary
Antibiotics are widely existing in the environment and have aroused a lot of concern about their numerous dosages, toxicity, and disturbance to the ecosystem’s function [1,2,3]. It has been reported that about 54,000 tons of antibiotics were used in China in 2013, and about 75% of them were applied to animal husbandry, where because of their poorly metabolized features, a 25–75% proportion of the ingested antibiotics are excreted out of the body via urine and feces to enter into soil, sediment and water bodies [2,4]. A recent study of antibiotic resistance genes in the groundwater environment reported that relative abundances of resistance genes range from 6.61 × 10−7 to 2.30 × 10−1 copies/16SrRNA gene copies [8]. Public Health 2018, 15, 2229; doi:10.3390/ijerph15102229 www.mdpi.com/journal/ijerph
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