Abstract
We report the use of biochar and Fe3O4 nanoparticles as co-stabilizers for oil-in-water (o/w) Pickering emulsion. The emulsion is subsequently used to prepare magnetic tetracycline-imprinted biochar composite microspheres (MMIPMs) with good uniformity and high selectivity. The MMIPMs were characterized by scanning electron microscopy (SEM), Brunner-Emmet-Teller (BET) measurements, Fourier transform infrared spectrometry (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and thermogravimetry analysis (TGA). The adsorption properties of tetracycline to the MMIPMs were investigated using different adsorption experiments including adsorption kinetic experiment, equilibrium binding experiment, selectivity evaluation and competitive adsorption tests. The theoretical maximum adsorption capacity of the MMIPMs (15.45 mg g−1) was greater than that of the raw biochar (2.10 mg g−1) and non-imprinted biochar composite microspheres (3.39 mg g−1) for tetracycline. Further, the MMIPMs were used as adsorbent for magnetic solid phase extraction (SPE) for the extraction of tetracycline present in drinking water, milk, fish and chicken samples. Under optimal conditions, the results showed good recovery yield ranging from 88.41% to 106.29% with a relative standard deviation (RSD) ranging from 0.35% to 6.83%, respectively.
Highlights
Tetracyclines (TCs), a large class of broad-spectrum antibiotic, have been extensively employed as therapeutic drugs and feed additives to fight infection and promote animal growth
The MMIPMs were characterized by scanning electron microscopy (SEM), Brunner-Emmet-Teller (BET) measurements, Fourier transform infrared spectrometry (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and thermogravimetry analysis (TGA)
The results indicated that MMIPMs with high specificity for template molecules (TC) could effectively resist the interference of structural analogs during the adsorption process
Summary
Tetracyclines (TCs), a large class of broad-spectrum antibiotic, have been extensively employed as therapeutic drugs and feed additives to fight infection and promote animal growth. Because of their unreasonable use and abuse, due to the recent increasing demands of livestock production, TCs have received increasing attention as an important class of contaminants of emerging concern (CEC). The conventional preparation of spherical structured biochar include hydrothermal carbonization, a ball milling method and a sodium alginate/sodium silicate/chitosan assisted method [13,14,15]. It is of great significance to develop a versatile and mild method for preparation of biochar composite materials with tailored sizes and high specificity
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