改性纳米纤维素微球的制备及其吸附水中四环素性能研究OA

[Objectives]This study aimed to prepare a cellulose-based absorbent material capable of effectively removing the contamination of tetrcycline antibiotics in water bodies.[Methods]The modified nanocellulose microspheres were fabricated using bacterial cellulose as the raw material.Firstly,the structural properties of the microspheres were comprehensively characterized using scanning electron microscopy(SEM),infrared spectroscopy(IR),X-ray diffraction(XRD),thermogravimetric(TG)analysis and brunauer-emmett-teller(BET)specific surface area and porosity analysis.Subsequently,the effects of initial tetracycline concentration,pH values,adsorption time,and temperature on adsorption performance were systematically investigated.Furthermore,the adsorption kinetics and isotherms were determined.[Results]SEM images revealed that the modified nanocellulose microspheres were uniform in size,with an average diameters of approximately 300 μm.Fourier transform infrared(FT-IR)spectra confirmed the successful grafting of 3-aminophenylboronic acid onto the nanocellulose surface.XRD pattern indicated an alteration in the crystalline structure of cellulose following modification.TG analysis demonstrated enhanced thermal stability of the modified nanocellulose microspheres.BET analysis determined that the specific surface area,average pore diameter,and pore volume were 36.858 m2•g-1,13.394 nm,and 0.128 cm3•g-1,respectively.Optimal adsorption performance was achieved under the following conditions:tetracycline concentration of 300 mg•L-1,temperature of 35℃,and pH3.The presence of Na+and K+had a negligible impact on adsorption(P>0.05),whereas high concentrations of Ca2+and Mg2+significantly reduced the adsorption capacity(P<0.01).Under these optimized conditions,the maximum adsorption capacity of the modified cellulose microspheres for tetracycline hydrochloride reached 77.81 mg•g-1.The adsorption process was better described by the pseudo-second-order kinetic model,and the equilibrium data are better fitted by the Freundlich model.[Conclusions]The synthesized modified nanocellulose microspheres exhibit potential for removing tetracycline antibiotics from wastewater,offering advantages such as straightforward preparation and cost-effectiveness,thus positioning them as a promising candidate for practical application.