The Preparation Of High Specific Surface Area Of Magnetic Carbon Materials As Well As The Adsorption Study Of Sulfa Antibiotics

Magnetic carbon composites not only have excellent adsorption characteristics of carbon materials, but also possess the property as the magnetic materials that can move following the applied magnetic field and can be easily separated, so they will have a wide range of applications in the adsorption, purification and environmental remediation. This paper mainly focuses on the preparation, activation and adsorption properties of the magnetic carbon. It included the following details:(1) The magnetic carbon nanospheres were prepared under hydrothemal method by using Fe3O4as magnetic nuclear, carbohydrate as shell. The article investigate the factors that have impact on the thickness of the coated carbon layer including categary of the carbon source, wether being modified by polyacrylic acid, the pH of the solution, the content of the carbon source and the reaction time.The condition that can obtain the thinkest carbon layer were: Both of0.1g Fe3O4that modified by polyacrylic acid and4g glucose dissolved in70mL deionized water and then reacted under the condition of temperature200℃, pH=10. The result revealed that the carbon layer reached50nm. In addition, the possible reaction mechanism of the hydrothemal process was disscussed according to the experiments.(2) The activation manner that used in inderstry was introduced in the experiments. The magnetic carbon composites were soked in ZnCl2solution and then calcined under inert gases. The experiments mainly inspect the two factors (calcined temperature and calcined time) that had impacts on the surface area and porous volume. The reslut showed that with the calcined temperature600℃for1h following soaked in ZnCl2solution, the surface area and the porous volume could reach1228m2/g and0.445m3/g, respectively.(3) The adsorption characterization of the prepared magnetic carbon composites were studied by using sulfanilamide and sulfadiazine as adsorbate. The adsorption experiments mainly contained adsorption isothermal model, dynamic study, the impact of pH on the adsorption effect and the reuse ability. The results indicated that the process of sulfanilamide and sulfadiazine absorbed on magnetic carbon composites both followed Langmuir model and pseudo-second-order model. The pH had a great infuence on the adsorption efficiency. In the tested pH (3～10), the adsorption efficiency of the magnetic carbon composites for both sulfanilamide and sulfadiazine decreased as the pH increased. In the reuse experiments, after being reused for four times, the adsorption efficiency of the magnetic carbon composites for sulfanilamide and sulfadiazine could still reach71.2%and67.54%, which displayed excellent reuse effects.