In this work, we report on the fabrication of nanocomposites based on superparamagnetic iron oxide nanoparticles (SPIONs) in combination with hydroxyapatite (HAp) as a platform for drug delivery and magnetic hyperthermia application. First, the influence of experimental conditions such as co-precipitant, bath temperature, and pH on the morphology and magnetic properties of SPIONs was investigated. Then, the superparamagnetic particles were coated with the hydroxyapatite layer for further loading of anticancer drugs, determining the optimal thickness of the HAp shell. The composite was fabricated by the wet chemical process and was characterized by optimizing the experimental conditions of the wiring synthesis to obtain the superparamagnetic spherical material with a high HAp loading as a platform for drug uptake. SEM and TEM studies confirmed the round shape of the magnetic core up to 15 nm in size with a well-defined HAp shell. After checking the material’s superparamagnetic properties, the temperature dependence on time and alternating magnetic field strength was tested and optimized in hyperthermia experiments.
Cu3(BTC)2 (or HKUST-1) is a metal-organic framework (MOF) material that was synthesized by electrochemical method from Cu and benzene-1,3,5-tricarboxylic acid with large surface area and high porosity. The influence of some factors on the adsorption of ciprofloxacin (CIP) by Cu3(BTC)2 such as pH (4 - 11), initial concentration of CIP solution (10 - 80 mg/L), mass of adsorbent (1 - 5 mg) and adsorption time (10 - 60 minutes) has been studied. The results showed that the highest CIP adsorption capacity of Cu3(BTC)2 was achieved at pH 7. When the mass of Cu3(BTC)2 adsorbent increased (19.6 - 100.2 mg/L), the CIP adsorption capacity decreased, and the CIP removal efficiency increased. With 39.4 mg/L of the adsorbent and 20 mg/L of the CIP solution, the CIP adsorption capacity was 238.44 mg/g and the CIP removal efficiency was 46.53 %. The adsorption process took place rapidly in the first 20 minutes then reached equilibrium after about 30 minutes. The study of adsorption kinetics and isothermal adsorption showed that the CIP adsorption process on Cu3(BTC)2 material is consistent with the pseudo-second-order kinetic model and the Langmuir model. The CIP adsorption mechanism of Cu3(BTC)2 is also shown: л - л interaction, hydrogen bond, and electrostatic interaction.
Global challenges in removing heavy metal ions from aquatic reservoirs require novel solutions, especially the application of environmentally friendly materials. This paper presented the efficient removal of Fe3+ and Pb2+ ions from wastewater by apatite ore-based nanostructures. The synthesized material exhibited a nanostructure with high thermal stability, high porosity and negative surface potential, suitable for heavy metal removal in wastewater. The adsorption measurements performed in varying conditions (pH, mass of the adsorbent, and contact time onto the adsorbent) proved that even a few milligrams of the synthesized material could effectively absorb the lead and iron ions from the solution, reaching an effectiveness of about 90%. The maximum adsorption capacity followed the Langmuir isotherm model, estimated at 341 mg.g− 1 for Pb2+, and 1092 mg.g− 1 for Fe3+. Experiments conducted with industrial and craft-village’s wastewaters confirmed the high potential of the nanostructural chemically modified apatite as an efficient and affordable material for the removal of various pollutants from aqueous solutions in practical conditions.
Apatite ore from Lao Cai province (Vietnam) has large reserves and low cost which was purified by a simple chemical method. Apatite ore and purified one were characterized the molecular structure, phase component, specific surface area, element component, and morphology by IR, XRD, BET, EDX, and SEM methods. The IR result shows both materials have functional groups of fluorapatite such as PO43- and F-. XDR and EDX confirm that the main component of the ore is fluorapatite. After purification, the particles are smaller and more uniform with a higher specific surface area (36.62 m2/g compared with 3.76 m2/g of original apatite ore). Two materials were used to adsorb Pb2+ ions in an aqueous solution. The effect of adsorbent mass, pH, Pb2+ initial concentration, and contact time on adsorption efficiency and capacity was evaluated. The study of adsorption kinetics and isothermal adsorption showed that the Pb2+ adsorption process on apatite ore is matched with the pseudo-second-order kinetic model and the Langmuir model. The comparison between the original apatite ore and purified one was also studied. With 0.05 g of absorbent, after 15 minutes, the efficiency of purified ore is 97.47%, much higher compared with the original ore (50%) after 45 minutes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.