Efficient one-pot solvothermal synthesis of lanthanum–iron oxide and its application in tenofovir adsorption Scientific paper

Abstract

Novel magnetic lanthanum-iron oxide composites have been synthes­ized using a one-pot method. The proposed approach simplifies the synthesis process by eliminating traditional requirements such as pH adjustment and high-temperature calcination, resulting in a more streamlined procedure and the prod­uction of a magnetic material. The effects of the Fe-to-La ratio, reaction time, and reaction temperature on the properties and adsorption performance of the lanthanum–iron oxide composites were investigated. The synthesized composites were characterized by scanning electron microscopy, X-ray diffraction, vibrating sample magnetometry, Fourier-transform infrared spectroscopy, the Brunauer–Emmett–Teller method, thermogravimetric analysis and X-ray photoelectron spectroscopy, which indicated that the samples comprised of randomly oriented particles with sizes ranging from 20 to 200 nm, and possessed excellent crystal­linity, magnetic responsiveness and thermal stability. Additionally, this study explored the application of lanthanum–iron oxide in tenofovir ((R)-9-(2-phos­pho­nomethoxypropyl)adenine, PMPA) adsorption, with a maximum adsorption capacity of 34.06 mg/g under the conditions of adsorbent dosage = 0.9 g/L, pH 4, C = 50 mg/L and t = 25 °C. The lanthanum–iron oxide was simple to prepare and enabled rapid separation, which was beneficial for practical applications.