Comparison of adsorption characteristics of acid-base modified fly ash to norfloxacin

Abstract

Due to the norfloxacin will enter the natural water body with the effluent of the sewage treatment plant and cause water environment pollution, the research on how to effectively remove norfloxacin has become a hot topic. This experiment used hydrochloric acid and sodium hydroxide to study the modification of fly ash. The structure characteristics and properties of modified fly ash were determined by scanning electron microscope, X-ray diffractometer and infrared spectrometer, and the adsorption process of norfloxacin by fly ash was analyzed. It was found that the surface of fly ash modified by acid and alkali was rougher and the voids increased, which provided a rich adsorption site for the adsorption reaction of norfloxacin on fly ash, moreover, the specific surface area of sodium hydroxide modified fly ash increased the most, and the ability to adsorb norfloxacin was the strongest. The adsorption process characteristics showed that the adsorption reaction of norfloxacin is spontaneous, exothermic, disordered, and when the temperature increased, the adsorption amount of norfloxacin by fly ash was decreased, and the adsorption effect of fly ash on norfloxacin was the strongest under the pH = 7.0, yet inhibited when the adding of Ca²⁺ in the solution.

Keywords:

• Adsorption
• fly ash
• modification
• norfloxacin

Additional information

Funding

The article was supported by funding from the National Natural Science Foundation [31672051], the Major Science and Technology Projects in Jilin Province [2018020101018SF], the National Key Research and Development Program Support Projects [2016YFD0200203] and the Jilin Provincial Department of Education [JJKH20200337KJ] for assistance in this research.