Abstract
As an antibiotic, Norfloxacin (NOR) is widely found in the water environment and presents considerable harm to human beings. At present, the preparation of removal materials is complicated, and the removal efficiency is not high. The adsorption effect of modified activated carbon fiber felt (MACFF) electrosorption and its influencing factors on NOR were studied. Activated carbon fiber felt (ACFF) was modified with 20% nitric acid, and the ACFFs were characterized by SEM, TEM, and FTIR both before and after modification. The optimal working conditions for electrosorption with an MACFF electrode were as follows: the voltage was 1.0 V, the pH was 6, and the plate spacing was 10 mm. The maximum adsorption capacity of the MACFF for NOR was 128.55 mg/g. Model fitting showed that pseudo-second-order kinetic model and Langmuir model were more suitable for explaining this adsorption process. In addition, this study found that, with 20% nitric acid as the regeneration liquid and under the reverse charging method, the regeneration rate of the MACFF electrode was maintained at approximately 96% and the regeneration was good, therefore, this technology can not only save operation costs but also has good development prospects in sewage treatment.
Highlights
In recent years, antibiotics have been widely used in human diseases and animal husbandry to treat or prevent microbial infection [1]
In this study, modified activated carbon fiber felt (MACFF) is used for the adsorption of NOR in wastewater, and the results provide a reference for future research
Zhu et al treated the Activated carbon fiber felt (ACFF) with nitric acid for use as an electrode to improve its conductivity [26]; Wang et al used nitric acid-modified AC to desalinate aqueous solutions, and the results showed that MACFF can greatly improve the desalination effect [27]
Summary
Antibiotics have been widely used in human diseases and animal husbandry to treat or prevent microbial infection [1]. The main methods used to remove antibiotics include adsorption [8], biosorption [9], the Fenton method [10], the electrochemical oxidation method [11] and the advanced oxidation processes (AOPs) [12] Among these methods, adsorption has low cost, high efficiency, environmental protection characteristics, easy operation, and good application prospects [13]. The electrosorption degradation method is characterized by simplicity, easy handling, safety, low energy consumption, and no secondary pollution; it has the potential to be a beneficial technology for environmental purification [14]. Electrosorption can effectively remove some biorefractory organic pollutants under low energy consumption and is a promising water purification method [15]
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